/* Data flow analysis for GNU compiler.
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/* Data flow analysis for GNU compiler.
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Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
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Free Software Foundation, Inc.
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Free Software Foundation, Inc.
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This file is part of GCC.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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Software Foundation; either version 3, or (at your option) any later
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version.
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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/* This file contains the data flow analysis pass of the compiler. It
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/* This file contains the data flow analysis pass of the compiler. It
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computes data flow information which tells combine_instructions
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computes data flow information which tells combine_instructions
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which insns to consider combining and controls register allocation.
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which insns to consider combining and controls register allocation.
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Additional data flow information that is too bulky to record is
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Additional data flow information that is too bulky to record is
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generated during the analysis, and is used at that time to create
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generated during the analysis, and is used at that time to create
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autoincrement and autodecrement addressing.
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autoincrement and autodecrement addressing.
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The first step is dividing the function into basic blocks.
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The first step is dividing the function into basic blocks.
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find_basic_blocks does this. Then life_analysis determines
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find_basic_blocks does this. Then life_analysis determines
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where each register is live and where it is dead.
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where each register is live and where it is dead.
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** find_basic_blocks **
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** find_basic_blocks **
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find_basic_blocks divides the current function's rtl into basic
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find_basic_blocks divides the current function's rtl into basic
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blocks and constructs the CFG. The blocks are recorded in the
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blocks and constructs the CFG. The blocks are recorded in the
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basic_block_info array; the CFG exists in the edge structures
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basic_block_info array; the CFG exists in the edge structures
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referenced by the blocks.
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referenced by the blocks.
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find_basic_blocks also finds any unreachable loops and deletes them.
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find_basic_blocks also finds any unreachable loops and deletes them.
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** life_analysis **
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** life_analysis **
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life_analysis is called immediately after find_basic_blocks.
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life_analysis is called immediately after find_basic_blocks.
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It uses the basic block information to determine where each
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It uses the basic block information to determine where each
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hard or pseudo register is live.
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hard or pseudo register is live.
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** live-register info **
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** live-register info **
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The information about where each register is live is in two parts:
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The information about where each register is live is in two parts:
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the REG_NOTES of insns, and the vector basic_block->global_live_at_start.
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the REG_NOTES of insns, and the vector basic_block->global_live_at_start.
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basic_block->global_live_at_start has an element for each basic
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basic_block->global_live_at_start has an element for each basic
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block, and the element is a bit-vector with a bit for each hard or
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block, and the element is a bit-vector with a bit for each hard or
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pseudo register. The bit is 1 if the register is live at the
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pseudo register. The bit is 1 if the register is live at the
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beginning of the basic block.
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beginning of the basic block.
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Two types of elements can be added to an insn's REG_NOTES.
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Two types of elements can be added to an insn's REG_NOTES.
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A REG_DEAD note is added to an insn's REG_NOTES for any register
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A REG_DEAD note is added to an insn's REG_NOTES for any register
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that meets both of two conditions: The value in the register is not
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that meets both of two conditions: The value in the register is not
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needed in subsequent insns and the insn does not replace the value in
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needed in subsequent insns and the insn does not replace the value in
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the register (in the case of multi-word hard registers, the value in
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the register (in the case of multi-word hard registers, the value in
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each register must be replaced by the insn to avoid a REG_DEAD note).
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each register must be replaced by the insn to avoid a REG_DEAD note).
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In the vast majority of cases, an object in a REG_DEAD note will be
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In the vast majority of cases, an object in a REG_DEAD note will be
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used somewhere in the insn. The (rare) exception to this is if an
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used somewhere in the insn. The (rare) exception to this is if an
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insn uses a multi-word hard register and only some of the registers are
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insn uses a multi-word hard register and only some of the registers are
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needed in subsequent insns. In that case, REG_DEAD notes will be
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needed in subsequent insns. In that case, REG_DEAD notes will be
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provided for those hard registers that are not subsequently needed.
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provided for those hard registers that are not subsequently needed.
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Partial REG_DEAD notes of this type do not occur when an insn sets
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Partial REG_DEAD notes of this type do not occur when an insn sets
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only some of the hard registers used in such a multi-word operand;
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only some of the hard registers used in such a multi-word operand;
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omitting REG_DEAD notes for objects stored in an insn is optional and
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omitting REG_DEAD notes for objects stored in an insn is optional and
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the desire to do so does not justify the complexity of the partial
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the desire to do so does not justify the complexity of the partial
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REG_DEAD notes.
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REG_DEAD notes.
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REG_UNUSED notes are added for each register that is set by the insn
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REG_UNUSED notes are added for each register that is set by the insn
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but is unused subsequently (if every register set by the insn is unused
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but is unused subsequently (if every register set by the insn is unused
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and the insn does not reference memory or have some other side-effect,
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and the insn does not reference memory or have some other side-effect,
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the insn is deleted instead). If only part of a multi-word hard
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the insn is deleted instead). If only part of a multi-word hard
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register is used in a subsequent insn, REG_UNUSED notes are made for
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register is used in a subsequent insn, REG_UNUSED notes are made for
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the parts that will not be used.
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the parts that will not be used.
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To determine which registers are live after any insn, one can
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To determine which registers are live after any insn, one can
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start from the beginning of the basic block and scan insns, noting
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start from the beginning of the basic block and scan insns, noting
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which registers are set by each insn and which die there.
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which registers are set by each insn and which die there.
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** Other actions of life_analysis **
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** Other actions of life_analysis **
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life_analysis sets up the LOG_LINKS fields of insns because the
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life_analysis sets up the LOG_LINKS fields of insns because the
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information needed to do so is readily available.
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information needed to do so is readily available.
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life_analysis deletes insns whose only effect is to store a value
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life_analysis deletes insns whose only effect is to store a value
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that is never used.
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that is never used.
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life_analysis notices cases where a reference to a register as
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life_analysis notices cases where a reference to a register as
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a memory address can be combined with a preceding or following
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a memory address can be combined with a preceding or following
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incrementation or decrementation of the register. The separate
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incrementation or decrementation of the register. The separate
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instruction to increment or decrement is deleted and the address
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instruction to increment or decrement is deleted and the address
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is changed to a POST_INC or similar rtx.
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is changed to a POST_INC or similar rtx.
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Each time an incrementing or decrementing address is created,
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Each time an incrementing or decrementing address is created,
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a REG_INC element is added to the insn's REG_NOTES list.
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a REG_INC element is added to the insn's REG_NOTES list.
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life_analysis fills in certain vectors containing information about
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life_analysis fills in certain vectors containing information about
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register usage: REG_N_REFS, REG_N_DEATHS, REG_N_SETS, REG_LIVE_LENGTH,
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register usage: REG_N_REFS, REG_N_DEATHS, REG_N_SETS, REG_LIVE_LENGTH,
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REG_N_CALLS_CROSSED, REG_N_THROWING_CALLS_CROSSED and REG_BASIC_BLOCK.
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REG_N_CALLS_CROSSED, REG_N_THROWING_CALLS_CROSSED and REG_BASIC_BLOCK.
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life_analysis sets current_function_sp_is_unchanging if the function
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life_analysis sets current_function_sp_is_unchanging if the function
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doesn't modify the stack pointer. */
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doesn't modify the stack pointer. */
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/* TODO:
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/* TODO:
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Split out from life_analysis:
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Split out from life_analysis:
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- local property discovery
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- local property discovery
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- global property computation
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- global property computation
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- log links creation
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- log links creation
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- pre/post modify transformation
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- pre/post modify transformation
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*/
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*/
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#include "config.h"
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#include "config.h"
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#include "system.h"
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#include "system.h"
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#include "coretypes.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tm.h"
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#include "tree.h"
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#include "tree.h"
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#include "rtl.h"
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#include "rtl.h"
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#include "tm_p.h"
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#include "tm_p.h"
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#include "hard-reg-set.h"
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#include "hard-reg-set.h"
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#include "basic-block.h"
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#include "basic-block.h"
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#include "insn-config.h"
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#include "insn-config.h"
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#include "regs.h"
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#include "regs.h"
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#include "flags.h"
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#include "flags.h"
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#include "output.h"
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#include "output.h"
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#include "function.h"
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#include "function.h"
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#include "except.h"
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#include "except.h"
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#include "toplev.h"
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#include "toplev.h"
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#include "recog.h"
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#include "recog.h"
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#include "expr.h"
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#include "expr.h"
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#include "timevar.h"
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#include "timevar.h"
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#include "obstack.h"
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#include "obstack.h"
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#include "splay-tree.h"
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#include "splay-tree.h"
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#include "tree-pass.h"
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#include "tree-pass.h"
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#include "params.h"
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#include "params.h"
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#ifndef HAVE_epilogue
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#ifndef HAVE_epilogue
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#define HAVE_epilogue 0
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#define HAVE_epilogue 0
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#endif
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#endif
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#ifndef HAVE_prologue
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#ifndef HAVE_prologue
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#define HAVE_prologue 0
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#define HAVE_prologue 0
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#endif
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#endif
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#ifndef HAVE_sibcall_epilogue
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#ifndef HAVE_sibcall_epilogue
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#define HAVE_sibcall_epilogue 0
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#define HAVE_sibcall_epilogue 0
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#endif
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#endif
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#ifndef EPILOGUE_USES
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#ifndef EPILOGUE_USES
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#define EPILOGUE_USES(REGNO) 0
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#define EPILOGUE_USES(REGNO) 0
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#endif
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#endif
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#ifndef EH_USES
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#ifndef EH_USES
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#define EH_USES(REGNO) 0
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#define EH_USES(REGNO) 0
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#endif
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#endif
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#ifdef HAVE_conditional_execution
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#ifdef HAVE_conditional_execution
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#ifndef REVERSE_CONDEXEC_PREDICATES_P
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#ifndef REVERSE_CONDEXEC_PREDICATES_P
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#define REVERSE_CONDEXEC_PREDICATES_P(x, y) \
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#define REVERSE_CONDEXEC_PREDICATES_P(x, y) \
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(GET_CODE ((x)) == reversed_comparison_code ((y), NULL))
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(GET_CODE ((x)) == reversed_comparison_code ((y), NULL))
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#endif
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#endif
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#endif
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#endif
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/* This is the maximum number of times we process any given block if the
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/* This is the maximum number of times we process any given block if the
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latest loop depth count is smaller than this number. Only used for the
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latest loop depth count is smaller than this number. Only used for the
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failure strategy to avoid infinite loops in calculate_global_regs_live. */
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failure strategy to avoid infinite loops in calculate_global_regs_live. */
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#define MAX_LIVENESS_ROUNDS 20
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#define MAX_LIVENESS_ROUNDS 20
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/* Nonzero if the second flow pass has completed. */
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/* Nonzero if the second flow pass has completed. */
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int flow2_completed;
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int flow2_completed;
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/* Maximum register number used in this function, plus one. */
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/* Maximum register number used in this function, plus one. */
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int max_regno;
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int max_regno;
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/* Indexed by n, giving various register information */
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/* Indexed by n, giving various register information */
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VEC(reg_info_p,heap) *reg_n_info;
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VEC(reg_info_p,heap) *reg_n_info;
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/* Regset of regs live when calls to `setjmp'-like functions happen. */
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/* Regset of regs live when calls to `setjmp'-like functions happen. */
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/* ??? Does this exist only for the setjmp-clobbered warning message? */
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/* ??? Does this exist only for the setjmp-clobbered warning message? */
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static regset regs_live_at_setjmp;
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static regset regs_live_at_setjmp;
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/* List made of EXPR_LIST rtx's which gives pairs of pseudo registers
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/* List made of EXPR_LIST rtx's which gives pairs of pseudo registers
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that have to go in the same hard reg.
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that have to go in the same hard reg.
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The first two regs in the list are a pair, and the next two
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The first two regs in the list are a pair, and the next two
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are another pair, etc. */
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are another pair, etc. */
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rtx regs_may_share;
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rtx regs_may_share;
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/* Set of registers that may be eliminable. These are handled specially
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/* Set of registers that may be eliminable. These are handled specially
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in updating regs_ever_live. */
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in updating regs_ever_live. */
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static HARD_REG_SET elim_reg_set;
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static HARD_REG_SET elim_reg_set;
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/* Holds information for tracking conditional register life information. */
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/* Holds information for tracking conditional register life information. */
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struct reg_cond_life_info
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struct reg_cond_life_info
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{
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{
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/* A boolean expression of conditions under which a register is dead. */
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/* A boolean expression of conditions under which a register is dead. */
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rtx condition;
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rtx condition;
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/* Conditions under which a register is dead at the basic block end. */
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/* Conditions under which a register is dead at the basic block end. */
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rtx orig_condition;
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rtx orig_condition;
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/* A boolean expression of conditions under which a register has been
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/* A boolean expression of conditions under which a register has been
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stored into. */
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stored into. */
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rtx stores;
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rtx stores;
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/* ??? Could store mask of bytes that are dead, so that we could finally
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/* ??? Could store mask of bytes that are dead, so that we could finally
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track lifetimes of multi-word registers accessed via subregs. */
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track lifetimes of multi-word registers accessed via subregs. */
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};
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};
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/* For use in communicating between propagate_block and its subroutines.
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/* For use in communicating between propagate_block and its subroutines.
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Holds all information needed to compute life and def-use information. */
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Holds all information needed to compute life and def-use information. */
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struct propagate_block_info
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struct propagate_block_info
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{
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{
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/* The basic block we're considering. */
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/* The basic block we're considering. */
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basic_block bb;
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basic_block bb;
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/* Bit N is set if register N is conditionally or unconditionally live. */
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/* Bit N is set if register N is conditionally or unconditionally live. */
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regset reg_live;
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regset reg_live;
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/* Bit N is set if register N is set this insn. */
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/* Bit N is set if register N is set this insn. */
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regset new_set;
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regset new_set;
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/* Element N is the next insn that uses (hard or pseudo) register N
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/* Element N is the next insn that uses (hard or pseudo) register N
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within the current basic block; or zero, if there is no such insn. */
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within the current basic block; or zero, if there is no such insn. */
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rtx *reg_next_use;
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rtx *reg_next_use;
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/* Contains a list of all the MEMs we are tracking for dead store
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/* Contains a list of all the MEMs we are tracking for dead store
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elimination. */
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elimination. */
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rtx mem_set_list;
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rtx mem_set_list;
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/* If non-null, record the set of registers set unconditionally in the
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/* If non-null, record the set of registers set unconditionally in the
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basic block. */
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basic block. */
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regset local_set;
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regset local_set;
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/* If non-null, record the set of registers set conditionally in the
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/* If non-null, record the set of registers set conditionally in the
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basic block. */
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basic block. */
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regset cond_local_set;
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regset cond_local_set;
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#ifdef HAVE_conditional_execution
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#ifdef HAVE_conditional_execution
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/* Indexed by register number, holds a reg_cond_life_info for each
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/* Indexed by register number, holds a reg_cond_life_info for each
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register that is not unconditionally live or dead. */
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register that is not unconditionally live or dead. */
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splay_tree reg_cond_dead;
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splay_tree reg_cond_dead;
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|
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/* Bit N is set if register N is in an expression in reg_cond_dead. */
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/* Bit N is set if register N is in an expression in reg_cond_dead. */
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regset reg_cond_reg;
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regset reg_cond_reg;
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#endif
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#endif
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/* The length of mem_set_list. */
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/* The length of mem_set_list. */
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int mem_set_list_len;
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int mem_set_list_len;
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|
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/* Nonzero if the value of CC0 is live. */
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/* Nonzero if the value of CC0 is live. */
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int cc0_live;
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int cc0_live;
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|
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/* Flags controlling the set of information propagate_block collects. */
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/* Flags controlling the set of information propagate_block collects. */
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int flags;
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int flags;
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/* Index of instruction being processed. */
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/* Index of instruction being processed. */
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int insn_num;
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int insn_num;
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};
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};
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|
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/* Number of dead insns removed. */
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/* Number of dead insns removed. */
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static int ndead;
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static int ndead;
|
|
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/* When PROP_REG_INFO set, array contains pbi->insn_num of instruction
|
/* When PROP_REG_INFO set, array contains pbi->insn_num of instruction
|
where given register died. When the register is marked alive, we use the
|
where given register died. When the register is marked alive, we use the
|
information to compute amount of instructions life range cross.
|
information to compute amount of instructions life range cross.
|
(remember, we are walking backward). This can be computed as current
|
(remember, we are walking backward). This can be computed as current
|
pbi->insn_num - reg_deaths[regno].
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pbi->insn_num - reg_deaths[regno].
|
At the end of processing each basic block, the remaining live registers
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At the end of processing each basic block, the remaining live registers
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are inspected and live ranges are increased same way so liverange of global
|
are inspected and live ranges are increased same way so liverange of global
|
registers are computed correctly.
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registers are computed correctly.
|
|
|
The array is maintained clear for dead registers, so it can be safely reused
|
The array is maintained clear for dead registers, so it can be safely reused
|
for next basic block without expensive memset of the whole array after
|
for next basic block without expensive memset of the whole array after
|
reseting pbi->insn_num to 0. */
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reseting pbi->insn_num to 0. */
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|
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static int *reg_deaths;
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static int *reg_deaths;
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|
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/* Forward declarations */
|
/* Forward declarations */
|
static int verify_wide_reg_1 (rtx *, void *);
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static int verify_wide_reg_1 (rtx *, void *);
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static void verify_wide_reg (int, basic_block);
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static void verify_wide_reg (int, basic_block);
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static void verify_local_live_at_start (regset, basic_block);
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static void verify_local_live_at_start (regset, basic_block);
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static void notice_stack_pointer_modification_1 (rtx, rtx, void *);
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static void notice_stack_pointer_modification_1 (rtx, rtx, void *);
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static void notice_stack_pointer_modification (void);
|
static void notice_stack_pointer_modification (void);
|
static void mark_reg (rtx, void *);
|
static void mark_reg (rtx, void *);
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static void mark_regs_live_at_end (regset);
|
static void mark_regs_live_at_end (regset);
|
static void calculate_global_regs_live (sbitmap, sbitmap, int);
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static void calculate_global_regs_live (sbitmap, sbitmap, int);
|
static void propagate_block_delete_insn (rtx);
|
static void propagate_block_delete_insn (rtx);
|
static rtx propagate_block_delete_libcall (rtx, rtx);
|
static rtx propagate_block_delete_libcall (rtx, rtx);
|
static int insn_dead_p (struct propagate_block_info *, rtx, int, rtx);
|
static int insn_dead_p (struct propagate_block_info *, rtx, int, rtx);
|
static int libcall_dead_p (struct propagate_block_info *, rtx, rtx);
|
static int libcall_dead_p (struct propagate_block_info *, rtx, rtx);
|
static void mark_set_regs (struct propagate_block_info *, rtx, rtx);
|
static void mark_set_regs (struct propagate_block_info *, rtx, rtx);
|
static void mark_set_1 (struct propagate_block_info *, enum rtx_code, rtx,
|
static void mark_set_1 (struct propagate_block_info *, enum rtx_code, rtx,
|
rtx, rtx, int);
|
rtx, rtx, int);
|
static int find_regno_partial (rtx *, void *);
|
static int find_regno_partial (rtx *, void *);
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|
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
static int mark_regno_cond_dead (struct propagate_block_info *, int, rtx);
|
static int mark_regno_cond_dead (struct propagate_block_info *, int, rtx);
|
static void free_reg_cond_life_info (splay_tree_value);
|
static void free_reg_cond_life_info (splay_tree_value);
|
static int flush_reg_cond_reg_1 (splay_tree_node, void *);
|
static int flush_reg_cond_reg_1 (splay_tree_node, void *);
|
static void flush_reg_cond_reg (struct propagate_block_info *, int);
|
static void flush_reg_cond_reg (struct propagate_block_info *, int);
|
static rtx elim_reg_cond (rtx, unsigned int);
|
static rtx elim_reg_cond (rtx, unsigned int);
|
static rtx ior_reg_cond (rtx, rtx, int);
|
static rtx ior_reg_cond (rtx, rtx, int);
|
static rtx not_reg_cond (rtx);
|
static rtx not_reg_cond (rtx);
|
static rtx and_reg_cond (rtx, rtx, int);
|
static rtx and_reg_cond (rtx, rtx, int);
|
#endif
|
#endif
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
static void attempt_auto_inc (struct propagate_block_info *, rtx, rtx, rtx,
|
static void attempt_auto_inc (struct propagate_block_info *, rtx, rtx, rtx,
|
rtx, rtx);
|
rtx, rtx);
|
static void find_auto_inc (struct propagate_block_info *, rtx, rtx);
|
static void find_auto_inc (struct propagate_block_info *, rtx, rtx);
|
static int try_pre_increment_1 (struct propagate_block_info *, rtx);
|
static int try_pre_increment_1 (struct propagate_block_info *, rtx);
|
static int try_pre_increment (rtx, rtx, HOST_WIDE_INT);
|
static int try_pre_increment (rtx, rtx, HOST_WIDE_INT);
|
#endif
|
#endif
|
static void mark_used_reg (struct propagate_block_info *, rtx, rtx, rtx);
|
static void mark_used_reg (struct propagate_block_info *, rtx, rtx, rtx);
|
static void mark_used_regs (struct propagate_block_info *, rtx, rtx, rtx);
|
static void mark_used_regs (struct propagate_block_info *, rtx, rtx, rtx);
|
void debug_flow_info (void);
|
void debug_flow_info (void);
|
static void add_to_mem_set_list (struct propagate_block_info *, rtx);
|
static void add_to_mem_set_list (struct propagate_block_info *, rtx);
|
static int invalidate_mems_from_autoinc (rtx *, void *);
|
static int invalidate_mems_from_autoinc (rtx *, void *);
|
static void invalidate_mems_from_set (struct propagate_block_info *, rtx);
|
static void invalidate_mems_from_set (struct propagate_block_info *, rtx);
|
static void clear_log_links (sbitmap);
|
static void clear_log_links (sbitmap);
|
static int count_or_remove_death_notes_bb (basic_block, int);
|
static int count_or_remove_death_notes_bb (basic_block, int);
|
static void allocate_bb_life_data (void);
|
static void allocate_bb_life_data (void);
|
|
|
/* Return the INSN immediately following the NOTE_INSN_BASIC_BLOCK
|
/* Return the INSN immediately following the NOTE_INSN_BASIC_BLOCK
|
note associated with the BLOCK. */
|
note associated with the BLOCK. */
|
|
|
rtx
|
rtx
|
first_insn_after_basic_block_note (basic_block block)
|
first_insn_after_basic_block_note (basic_block block)
|
{
|
{
|
rtx insn;
|
rtx insn;
|
|
|
/* Get the first instruction in the block. */
|
/* Get the first instruction in the block. */
|
insn = BB_HEAD (block);
|
insn = BB_HEAD (block);
|
|
|
if (insn == NULL_RTX)
|
if (insn == NULL_RTX)
|
return NULL_RTX;
|
return NULL_RTX;
|
if (LABEL_P (insn))
|
if (LABEL_P (insn))
|
insn = NEXT_INSN (insn);
|
insn = NEXT_INSN (insn);
|
gcc_assert (NOTE_INSN_BASIC_BLOCK_P (insn));
|
gcc_assert (NOTE_INSN_BASIC_BLOCK_P (insn));
|
|
|
return NEXT_INSN (insn);
|
return NEXT_INSN (insn);
|
}
|
}
|
|
|
/* Perform data flow analysis for the whole control flow graph.
|
/* Perform data flow analysis for the whole control flow graph.
|
FLAGS is a set of PROP_* flags to be used in accumulating flow info. */
|
FLAGS is a set of PROP_* flags to be used in accumulating flow info. */
|
|
|
void
|
void
|
life_analysis (int flags)
|
life_analysis (int flags)
|
{
|
{
|
#ifdef ELIMINABLE_REGS
|
#ifdef ELIMINABLE_REGS
|
int i;
|
int i;
|
static const struct {const int from, to; } eliminables[] = ELIMINABLE_REGS;
|
static const struct {const int from, to; } eliminables[] = ELIMINABLE_REGS;
|
#endif
|
#endif
|
|
|
/* Record which registers will be eliminated. We use this in
|
/* Record which registers will be eliminated. We use this in
|
mark_used_regs. */
|
mark_used_regs. */
|
|
|
CLEAR_HARD_REG_SET (elim_reg_set);
|
CLEAR_HARD_REG_SET (elim_reg_set);
|
|
|
#ifdef ELIMINABLE_REGS
|
#ifdef ELIMINABLE_REGS
|
for (i = 0; i < (int) ARRAY_SIZE (eliminables); i++)
|
for (i = 0; i < (int) ARRAY_SIZE (eliminables); i++)
|
SET_HARD_REG_BIT (elim_reg_set, eliminables[i].from);
|
SET_HARD_REG_BIT (elim_reg_set, eliminables[i].from);
|
#else
|
#else
|
SET_HARD_REG_BIT (elim_reg_set, FRAME_POINTER_REGNUM);
|
SET_HARD_REG_BIT (elim_reg_set, FRAME_POINTER_REGNUM);
|
#endif
|
#endif
|
|
|
|
|
#ifdef CANNOT_CHANGE_MODE_CLASS
|
#ifdef CANNOT_CHANGE_MODE_CLASS
|
if (flags & PROP_REG_INFO)
|
if (flags & PROP_REG_INFO)
|
init_subregs_of_mode ();
|
init_subregs_of_mode ();
|
#endif
|
#endif
|
|
|
if (! optimize)
|
if (! optimize)
|
flags &= ~(PROP_LOG_LINKS | PROP_AUTOINC | PROP_ALLOW_CFG_CHANGES);
|
flags &= ~(PROP_LOG_LINKS | PROP_AUTOINC | PROP_ALLOW_CFG_CHANGES);
|
|
|
/* The post-reload life analysis have (on a global basis) the same
|
/* The post-reload life analysis have (on a global basis) the same
|
registers live as was computed by reload itself. elimination
|
registers live as was computed by reload itself. elimination
|
Otherwise offsets and such may be incorrect.
|
Otherwise offsets and such may be incorrect.
|
|
|
Reload will make some registers as live even though they do not
|
Reload will make some registers as live even though they do not
|
appear in the rtl.
|
appear in the rtl.
|
|
|
We don't want to create new auto-incs after reload, since they
|
We don't want to create new auto-incs after reload, since they
|
are unlikely to be useful and can cause problems with shared
|
are unlikely to be useful and can cause problems with shared
|
stack slots. */
|
stack slots. */
|
if (reload_completed)
|
if (reload_completed)
|
flags &= ~(PROP_REG_INFO | PROP_AUTOINC);
|
flags &= ~(PROP_REG_INFO | PROP_AUTOINC);
|
|
|
/* We want alias analysis information for local dead store elimination. */
|
/* We want alias analysis information for local dead store elimination. */
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
init_alias_analysis ();
|
init_alias_analysis ();
|
|
|
/* Always remove no-op moves. Do this before other processing so
|
/* Always remove no-op moves. Do this before other processing so
|
that we don't have to keep re-scanning them. */
|
that we don't have to keep re-scanning them. */
|
delete_noop_moves ();
|
delete_noop_moves ();
|
|
|
/* Some targets can emit simpler epilogues if they know that sp was
|
/* Some targets can emit simpler epilogues if they know that sp was
|
not ever modified during the function. After reload, of course,
|
not ever modified during the function. After reload, of course,
|
we've already emitted the epilogue so there's no sense searching. */
|
we've already emitted the epilogue so there's no sense searching. */
|
if (! reload_completed)
|
if (! reload_completed)
|
notice_stack_pointer_modification ();
|
notice_stack_pointer_modification ();
|
|
|
/* Allocate and zero out data structures that will record the
|
/* Allocate and zero out data structures that will record the
|
data from lifetime analysis. */
|
data from lifetime analysis. */
|
allocate_reg_life_data ();
|
allocate_reg_life_data ();
|
allocate_bb_life_data ();
|
allocate_bb_life_data ();
|
|
|
/* Find the set of registers live on function exit. */
|
/* Find the set of registers live on function exit. */
|
mark_regs_live_at_end (EXIT_BLOCK_PTR->il.rtl->global_live_at_start);
|
mark_regs_live_at_end (EXIT_BLOCK_PTR->il.rtl->global_live_at_start);
|
|
|
/* "Update" life info from zero. It'd be nice to begin the
|
/* "Update" life info from zero. It'd be nice to begin the
|
relaxation with just the exit and noreturn blocks, but that set
|
relaxation with just the exit and noreturn blocks, but that set
|
is not immediately handy. */
|
is not immediately handy. */
|
|
|
if (flags & PROP_REG_INFO)
|
if (flags & PROP_REG_INFO)
|
{
|
{
|
memset (regs_ever_live, 0, sizeof (regs_ever_live));
|
memset (regs_ever_live, 0, sizeof (regs_ever_live));
|
memset (regs_asm_clobbered, 0, sizeof (regs_asm_clobbered));
|
memset (regs_asm_clobbered, 0, sizeof (regs_asm_clobbered));
|
}
|
}
|
update_life_info (NULL, UPDATE_LIFE_GLOBAL, flags);
|
update_life_info (NULL, UPDATE_LIFE_GLOBAL, flags);
|
if (reg_deaths)
|
if (reg_deaths)
|
{
|
{
|
free (reg_deaths);
|
free (reg_deaths);
|
reg_deaths = NULL;
|
reg_deaths = NULL;
|
}
|
}
|
|
|
/* Clean up. */
|
/* Clean up. */
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
end_alias_analysis ();
|
end_alias_analysis ();
|
|
|
if (dump_file)
|
if (dump_file)
|
dump_flow_info (dump_file, dump_flags);
|
dump_flow_info (dump_file, dump_flags);
|
|
|
/* Removing dead insns should have made jumptables really dead. */
|
/* Removing dead insns should have made jumptables really dead. */
|
delete_dead_jumptables ();
|
delete_dead_jumptables ();
|
}
|
}
|
|
|
/* A subroutine of verify_wide_reg, called through for_each_rtx.
|
/* A subroutine of verify_wide_reg, called through for_each_rtx.
|
Search for REGNO. If found, return 2 if it is not wider than
|
Search for REGNO. If found, return 2 if it is not wider than
|
word_mode. */
|
word_mode. */
|
|
|
static int
|
static int
|
verify_wide_reg_1 (rtx *px, void *pregno)
|
verify_wide_reg_1 (rtx *px, void *pregno)
|
{
|
{
|
rtx x = *px;
|
rtx x = *px;
|
unsigned int regno = *(int *) pregno;
|
unsigned int regno = *(int *) pregno;
|
|
|
if (REG_P (x) && REGNO (x) == regno)
|
if (REG_P (x) && REGNO (x) == regno)
|
{
|
{
|
if (GET_MODE_BITSIZE (GET_MODE (x)) <= BITS_PER_WORD)
|
if (GET_MODE_BITSIZE (GET_MODE (x)) <= BITS_PER_WORD)
|
return 2;
|
return 2;
|
return 1;
|
return 1;
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* A subroutine of verify_local_live_at_start. Search through insns
|
/* A subroutine of verify_local_live_at_start. Search through insns
|
of BB looking for register REGNO. */
|
of BB looking for register REGNO. */
|
|
|
static void
|
static void
|
verify_wide_reg (int regno, basic_block bb)
|
verify_wide_reg (int regno, basic_block bb)
|
{
|
{
|
rtx head = BB_HEAD (bb), end = BB_END (bb);
|
rtx head = BB_HEAD (bb), end = BB_END (bb);
|
|
|
while (1)
|
while (1)
|
{
|
{
|
if (INSN_P (head))
|
if (INSN_P (head))
|
{
|
{
|
int r = for_each_rtx (&PATTERN (head), verify_wide_reg_1, ®no);
|
int r = for_each_rtx (&PATTERN (head), verify_wide_reg_1, ®no);
|
if (r == 1)
|
if (r == 1)
|
return;
|
return;
|
if (r == 2)
|
if (r == 2)
|
break;
|
break;
|
}
|
}
|
if (head == end)
|
if (head == end)
|
break;
|
break;
|
head = NEXT_INSN (head);
|
head = NEXT_INSN (head);
|
}
|
}
|
if (dump_file)
|
if (dump_file)
|
{
|
{
|
fprintf (dump_file, "Register %d died unexpectedly.\n", regno);
|
fprintf (dump_file, "Register %d died unexpectedly.\n", regno);
|
dump_bb (bb, dump_file, 0);
|
dump_bb (bb, dump_file, 0);
|
}
|
}
|
internal_error ("internal consistency failure");
|
internal_error ("internal consistency failure");
|
}
|
}
|
|
|
/* A subroutine of update_life_info. Verify that there are no untoward
|
/* A subroutine of update_life_info. Verify that there are no untoward
|
changes in live_at_start during a local update. */
|
changes in live_at_start during a local update. */
|
|
|
static void
|
static void
|
verify_local_live_at_start (regset new_live_at_start, basic_block bb)
|
verify_local_live_at_start (regset new_live_at_start, basic_block bb)
|
{
|
{
|
if (reload_completed)
|
if (reload_completed)
|
{
|
{
|
/* After reload, there are no pseudos, nor subregs of multi-word
|
/* After reload, there are no pseudos, nor subregs of multi-word
|
registers. The regsets should exactly match. */
|
registers. The regsets should exactly match. */
|
if (! REG_SET_EQUAL_P (new_live_at_start,
|
if (! REG_SET_EQUAL_P (new_live_at_start,
|
bb->il.rtl->global_live_at_start))
|
bb->il.rtl->global_live_at_start))
|
{
|
{
|
if (dump_file)
|
if (dump_file)
|
{
|
{
|
fprintf (dump_file,
|
fprintf (dump_file,
|
"live_at_start mismatch in bb %d, aborting\nNew:\n",
|
"live_at_start mismatch in bb %d, aborting\nNew:\n",
|
bb->index);
|
bb->index);
|
debug_bitmap_file (dump_file, new_live_at_start);
|
debug_bitmap_file (dump_file, new_live_at_start);
|
fputs ("Old:\n", dump_file);
|
fputs ("Old:\n", dump_file);
|
dump_bb (bb, dump_file, 0);
|
dump_bb (bb, dump_file, 0);
|
}
|
}
|
internal_error ("internal consistency failure");
|
internal_error ("internal consistency failure");
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
unsigned i;
|
unsigned i;
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
/* Find the set of changed registers. */
|
/* Find the set of changed registers. */
|
XOR_REG_SET (new_live_at_start, bb->il.rtl->global_live_at_start);
|
XOR_REG_SET (new_live_at_start, bb->il.rtl->global_live_at_start);
|
|
|
EXECUTE_IF_SET_IN_REG_SET (new_live_at_start, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (new_live_at_start, 0, i, rsi)
|
{
|
{
|
/* No registers should die. */
|
/* No registers should die. */
|
if (REGNO_REG_SET_P (bb->il.rtl->global_live_at_start, i))
|
if (REGNO_REG_SET_P (bb->il.rtl->global_live_at_start, i))
|
{
|
{
|
if (dump_file)
|
if (dump_file)
|
{
|
{
|
fprintf (dump_file,
|
fprintf (dump_file,
|
"Register %d died unexpectedly.\n", i);
|
"Register %d died unexpectedly.\n", i);
|
dump_bb (bb, dump_file, 0);
|
dump_bb (bb, dump_file, 0);
|
}
|
}
|
internal_error ("internal consistency failure");
|
internal_error ("internal consistency failure");
|
}
|
}
|
/* Verify that the now-live register is wider than word_mode. */
|
/* Verify that the now-live register is wider than word_mode. */
|
verify_wide_reg (i, bb);
|
verify_wide_reg (i, bb);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Updates life information starting with the basic blocks set in BLOCKS.
|
/* Updates life information starting with the basic blocks set in BLOCKS.
|
If BLOCKS is null, consider it to be the universal set.
|
If BLOCKS is null, consider it to be the universal set.
|
|
|
If EXTENT is UPDATE_LIFE_LOCAL, such as after splitting or peepholing,
|
If EXTENT is UPDATE_LIFE_LOCAL, such as after splitting or peepholing,
|
we are only expecting local modifications to basic blocks. If we find
|
we are only expecting local modifications to basic blocks. If we find
|
extra registers live at the beginning of a block, then we either killed
|
extra registers live at the beginning of a block, then we either killed
|
useful data, or we have a broken split that wants data not provided.
|
useful data, or we have a broken split that wants data not provided.
|
If we find registers removed from live_at_start, that means we have
|
If we find registers removed from live_at_start, that means we have
|
a broken peephole that is killing a register it shouldn't.
|
a broken peephole that is killing a register it shouldn't.
|
|
|
??? This is not true in one situation -- when a pre-reload splitter
|
??? This is not true in one situation -- when a pre-reload splitter
|
generates subregs of a multi-word pseudo, current life analysis will
|
generates subregs of a multi-word pseudo, current life analysis will
|
lose the kill. So we _can_ have a pseudo go live. How irritating.
|
lose the kill. So we _can_ have a pseudo go live. How irritating.
|
|
|
It is also not true when a peephole decides that it doesn't need one
|
It is also not true when a peephole decides that it doesn't need one
|
or more of the inputs.
|
or more of the inputs.
|
|
|
Including PROP_REG_INFO does not properly refresh regs_ever_live
|
Including PROP_REG_INFO does not properly refresh regs_ever_live
|
unless the caller resets it to zero. */
|
unless the caller resets it to zero. */
|
|
|
int
|
int
|
update_life_info (sbitmap blocks, enum update_life_extent extent,
|
update_life_info (sbitmap blocks, enum update_life_extent extent,
|
int prop_flags)
|
int prop_flags)
|
{
|
{
|
regset tmp;
|
regset tmp;
|
unsigned i = 0;
|
unsigned i = 0;
|
int stabilized_prop_flags = prop_flags;
|
int stabilized_prop_flags = prop_flags;
|
basic_block bb;
|
basic_block bb;
|
|
|
tmp = ALLOC_REG_SET (®_obstack);
|
tmp = ALLOC_REG_SET (®_obstack);
|
ndead = 0;
|
ndead = 0;
|
|
|
if ((prop_flags & PROP_REG_INFO) && !reg_deaths)
|
if ((prop_flags & PROP_REG_INFO) && !reg_deaths)
|
reg_deaths = XCNEWVEC (int, max_regno);
|
reg_deaths = XCNEWVEC (int, max_regno);
|
|
|
timevar_push ((extent == UPDATE_LIFE_LOCAL || blocks)
|
timevar_push ((extent == UPDATE_LIFE_LOCAL || blocks)
|
? TV_LIFE_UPDATE : TV_LIFE);
|
? TV_LIFE_UPDATE : TV_LIFE);
|
|
|
/* Changes to the CFG are only allowed when
|
/* Changes to the CFG are only allowed when
|
doing a global update for the entire CFG. */
|
doing a global update for the entire CFG. */
|
gcc_assert (!(prop_flags & PROP_ALLOW_CFG_CHANGES)
|
gcc_assert (!(prop_flags & PROP_ALLOW_CFG_CHANGES)
|
|| (extent != UPDATE_LIFE_LOCAL && !blocks));
|
|| (extent != UPDATE_LIFE_LOCAL && !blocks));
|
|
|
/* For a global update, we go through the relaxation process again. */
|
/* For a global update, we go through the relaxation process again. */
|
if (extent != UPDATE_LIFE_LOCAL)
|
if (extent != UPDATE_LIFE_LOCAL)
|
{
|
{
|
for ( ; ; )
|
for ( ; ; )
|
{
|
{
|
int changed = 0;
|
int changed = 0;
|
|
|
calculate_global_regs_live (blocks, blocks,
|
calculate_global_regs_live (blocks, blocks,
|
prop_flags & (PROP_SCAN_DEAD_CODE
|
prop_flags & (PROP_SCAN_DEAD_CODE
|
| PROP_SCAN_DEAD_STORES
|
| PROP_SCAN_DEAD_STORES
|
| PROP_ALLOW_CFG_CHANGES));
|
| PROP_ALLOW_CFG_CHANGES));
|
|
|
if ((prop_flags & (PROP_KILL_DEAD_CODE | PROP_ALLOW_CFG_CHANGES))
|
if ((prop_flags & (PROP_KILL_DEAD_CODE | PROP_ALLOW_CFG_CHANGES))
|
!= (PROP_KILL_DEAD_CODE | PROP_ALLOW_CFG_CHANGES))
|
!= (PROP_KILL_DEAD_CODE | PROP_ALLOW_CFG_CHANGES))
|
break;
|
break;
|
|
|
/* Removing dead code may allow the CFG to be simplified which
|
/* Removing dead code may allow the CFG to be simplified which
|
in turn may allow for further dead code detection / removal. */
|
in turn may allow for further dead code detection / removal. */
|
FOR_EACH_BB_REVERSE (bb)
|
FOR_EACH_BB_REVERSE (bb)
|
{
|
{
|
COPY_REG_SET (tmp, bb->il.rtl->global_live_at_end);
|
COPY_REG_SET (tmp, bb->il.rtl->global_live_at_end);
|
changed |= propagate_block (bb, tmp, NULL, NULL,
|
changed |= propagate_block (bb, tmp, NULL, NULL,
|
prop_flags & (PROP_SCAN_DEAD_CODE
|
prop_flags & (PROP_SCAN_DEAD_CODE
|
| PROP_SCAN_DEAD_STORES
|
| PROP_SCAN_DEAD_STORES
|
| PROP_KILL_DEAD_CODE));
|
| PROP_KILL_DEAD_CODE));
|
}
|
}
|
|
|
/* Don't pass PROP_SCAN_DEAD_CODE or PROP_KILL_DEAD_CODE to
|
/* Don't pass PROP_SCAN_DEAD_CODE or PROP_KILL_DEAD_CODE to
|
subsequent propagate_block calls, since removing or acting as
|
subsequent propagate_block calls, since removing or acting as
|
removing dead code can affect global register liveness, which
|
removing dead code can affect global register liveness, which
|
is supposed to be finalized for this call after this loop. */
|
is supposed to be finalized for this call after this loop. */
|
stabilized_prop_flags
|
stabilized_prop_flags
|
&= ~(PROP_SCAN_DEAD_CODE | PROP_SCAN_DEAD_STORES
|
&= ~(PROP_SCAN_DEAD_CODE | PROP_SCAN_DEAD_STORES
|
| PROP_KILL_DEAD_CODE);
|
| PROP_KILL_DEAD_CODE);
|
|
|
if (! changed)
|
if (! changed)
|
break;
|
break;
|
|
|
/* We repeat regardless of what cleanup_cfg says. If there were
|
/* We repeat regardless of what cleanup_cfg says. If there were
|
instructions deleted above, that might have been only a
|
instructions deleted above, that might have been only a
|
partial improvement (see PARAM_MAX_FLOW_MEMORY_LOCATIONS usage).
|
partial improvement (see PARAM_MAX_FLOW_MEMORY_LOCATIONS usage).
|
Further improvement may be possible. */
|
Further improvement may be possible. */
|
cleanup_cfg (CLEANUP_EXPENSIVE);
|
cleanup_cfg (CLEANUP_EXPENSIVE);
|
|
|
/* Zap the life information from the last round. If we don't
|
/* Zap the life information from the last round. If we don't
|
do this, we can wind up with registers that no longer appear
|
do this, we can wind up with registers that no longer appear
|
in the code being marked live at entry. */
|
in the code being marked live at entry. */
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_start);
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_start);
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_end);
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_end);
|
}
|
}
|
}
|
}
|
|
|
/* If asked, remove notes from the blocks we'll update. */
|
/* If asked, remove notes from the blocks we'll update. */
|
if (extent == UPDATE_LIFE_GLOBAL_RM_NOTES)
|
if (extent == UPDATE_LIFE_GLOBAL_RM_NOTES)
|
count_or_remove_death_notes (blocks,
|
count_or_remove_death_notes (blocks,
|
prop_flags & PROP_POST_REGSTACK ? -1 : 1);
|
prop_flags & PROP_POST_REGSTACK ? -1 : 1);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* FIXME: This can go when the dataflow branch has been merged in. */
|
/* FIXME: This can go when the dataflow branch has been merged in. */
|
/* For a local update, if we are creating new REG_DEAD notes, then we
|
/* For a local update, if we are creating new REG_DEAD notes, then we
|
must delete the old ones first to avoid conflicts if they are
|
must delete the old ones first to avoid conflicts if they are
|
different. */
|
different. */
|
if (prop_flags & PROP_DEATH_NOTES)
|
if (prop_flags & PROP_DEATH_NOTES)
|
count_or_remove_death_notes (blocks,
|
count_or_remove_death_notes (blocks,
|
prop_flags & PROP_POST_REGSTACK ? -1 : 1);
|
prop_flags & PROP_POST_REGSTACK ? -1 : 1);
|
}
|
}
|
|
|
|
|
/* Clear log links in case we are asked to (re)compute them. */
|
/* Clear log links in case we are asked to (re)compute them. */
|
if (prop_flags & PROP_LOG_LINKS)
|
if (prop_flags & PROP_LOG_LINKS)
|
clear_log_links (blocks);
|
clear_log_links (blocks);
|
|
|
if (blocks)
|
if (blocks)
|
{
|
{
|
sbitmap_iterator sbi;
|
sbitmap_iterator sbi;
|
|
|
EXECUTE_IF_SET_IN_SBITMAP (blocks, 0, i, sbi)
|
EXECUTE_IF_SET_IN_SBITMAP (blocks, 0, i, sbi)
|
{
|
{
|
bb = BASIC_BLOCK (i);
|
bb = BASIC_BLOCK (i);
|
if (bb)
|
if (bb)
|
{
|
{
|
/* The bitmap may be flawed in that one of the basic
|
/* The bitmap may be flawed in that one of the basic
|
blocks may have been deleted before you get here. */
|
blocks may have been deleted before you get here. */
|
COPY_REG_SET (tmp, bb->il.rtl->global_live_at_end);
|
COPY_REG_SET (tmp, bb->il.rtl->global_live_at_end);
|
propagate_block (bb, tmp, NULL, NULL, stabilized_prop_flags);
|
propagate_block (bb, tmp, NULL, NULL, stabilized_prop_flags);
|
|
|
if (extent == UPDATE_LIFE_LOCAL)
|
if (extent == UPDATE_LIFE_LOCAL)
|
verify_local_live_at_start (tmp, bb);
|
verify_local_live_at_start (tmp, bb);
|
}
|
}
|
};
|
};
|
}
|
}
|
else
|
else
|
{
|
{
|
FOR_EACH_BB_REVERSE (bb)
|
FOR_EACH_BB_REVERSE (bb)
|
{
|
{
|
COPY_REG_SET (tmp, bb->il.rtl->global_live_at_end);
|
COPY_REG_SET (tmp, bb->il.rtl->global_live_at_end);
|
|
|
propagate_block (bb, tmp, NULL, NULL, stabilized_prop_flags);
|
propagate_block (bb, tmp, NULL, NULL, stabilized_prop_flags);
|
|
|
if (extent == UPDATE_LIFE_LOCAL)
|
if (extent == UPDATE_LIFE_LOCAL)
|
verify_local_live_at_start (tmp, bb);
|
verify_local_live_at_start (tmp, bb);
|
}
|
}
|
}
|
}
|
|
|
FREE_REG_SET (tmp);
|
FREE_REG_SET (tmp);
|
|
|
if (prop_flags & PROP_REG_INFO)
|
if (prop_flags & PROP_REG_INFO)
|
{
|
{
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
/* The only pseudos that are live at the beginning of the function
|
/* The only pseudos that are live at the beginning of the function
|
are those that were not set anywhere in the function. local-alloc
|
are those that were not set anywhere in the function. local-alloc
|
doesn't know how to handle these correctly, so mark them as not
|
doesn't know how to handle these correctly, so mark them as not
|
local to any one basic block. */
|
local to any one basic block. */
|
EXECUTE_IF_SET_IN_REG_SET (ENTRY_BLOCK_PTR->il.rtl->global_live_at_end,
|
EXECUTE_IF_SET_IN_REG_SET (ENTRY_BLOCK_PTR->il.rtl->global_live_at_end,
|
FIRST_PSEUDO_REGISTER, i, rsi)
|
FIRST_PSEUDO_REGISTER, i, rsi)
|
REG_BASIC_BLOCK (i) = REG_BLOCK_GLOBAL;
|
REG_BASIC_BLOCK (i) = REG_BLOCK_GLOBAL;
|
|
|
/* We have a problem with any pseudoreg that lives across the setjmp.
|
/* We have a problem with any pseudoreg that lives across the setjmp.
|
ANSI says that if a user variable does not change in value between
|
ANSI says that if a user variable does not change in value between
|
the setjmp and the longjmp, then the longjmp preserves it. This
|
the setjmp and the longjmp, then the longjmp preserves it. This
|
includes longjmp from a place where the pseudo appears dead.
|
includes longjmp from a place where the pseudo appears dead.
|
(In principle, the value still exists if it is in scope.)
|
(In principle, the value still exists if it is in scope.)
|
If the pseudo goes in a hard reg, some other value may occupy
|
If the pseudo goes in a hard reg, some other value may occupy
|
that hard reg where this pseudo is dead, thus clobbering the pseudo.
|
that hard reg where this pseudo is dead, thus clobbering the pseudo.
|
Conclusion: such a pseudo must not go in a hard reg. */
|
Conclusion: such a pseudo must not go in a hard reg. */
|
EXECUTE_IF_SET_IN_REG_SET (regs_live_at_setjmp,
|
EXECUTE_IF_SET_IN_REG_SET (regs_live_at_setjmp,
|
FIRST_PSEUDO_REGISTER, i, rsi)
|
FIRST_PSEUDO_REGISTER, i, rsi)
|
{
|
{
|
if (regno_reg_rtx[i] != 0)
|
if (regno_reg_rtx[i] != 0)
|
{
|
{
|
REG_LIVE_LENGTH (i) = -1;
|
REG_LIVE_LENGTH (i) = -1;
|
REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
|
REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
|
}
|
}
|
}
|
}
|
}
|
}
|
if (reg_deaths)
|
if (reg_deaths)
|
{
|
{
|
free (reg_deaths);
|
free (reg_deaths);
|
reg_deaths = NULL;
|
reg_deaths = NULL;
|
}
|
}
|
timevar_pop ((extent == UPDATE_LIFE_LOCAL || blocks)
|
timevar_pop ((extent == UPDATE_LIFE_LOCAL || blocks)
|
? TV_LIFE_UPDATE : TV_LIFE);
|
? TV_LIFE_UPDATE : TV_LIFE);
|
if (ndead && dump_file)
|
if (ndead && dump_file)
|
fprintf (dump_file, "deleted %i dead insns\n", ndead);
|
fprintf (dump_file, "deleted %i dead insns\n", ndead);
|
return ndead;
|
return ndead;
|
}
|
}
|
|
|
/* Update life information in all blocks where BB_DIRTY is set. */
|
/* Update life information in all blocks where BB_DIRTY is set. */
|
|
|
int
|
int
|
update_life_info_in_dirty_blocks (enum update_life_extent extent, int prop_flags)
|
update_life_info_in_dirty_blocks (enum update_life_extent extent, int prop_flags)
|
{
|
{
|
sbitmap update_life_blocks = sbitmap_alloc (last_basic_block);
|
sbitmap update_life_blocks = sbitmap_alloc (last_basic_block);
|
int n = 0;
|
int n = 0;
|
basic_block bb;
|
basic_block bb;
|
int retval = 0;
|
int retval = 0;
|
|
|
sbitmap_zero (update_life_blocks);
|
sbitmap_zero (update_life_blocks);
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
if (bb->flags & BB_DIRTY)
|
if (bb->flags & BB_DIRTY)
|
{
|
{
|
SET_BIT (update_life_blocks, bb->index);
|
SET_BIT (update_life_blocks, bb->index);
|
n++;
|
n++;
|
}
|
}
|
}
|
}
|
|
|
if (n)
|
if (n)
|
retval = update_life_info (update_life_blocks, extent, prop_flags);
|
retval = update_life_info (update_life_blocks, extent, prop_flags);
|
|
|
sbitmap_free (update_life_blocks);
|
sbitmap_free (update_life_blocks);
|
return retval;
|
return retval;
|
}
|
}
|
|
|
/* Free the variables allocated by find_basic_blocks. */
|
/* Free the variables allocated by find_basic_blocks. */
|
|
|
void
|
void
|
free_basic_block_vars (void)
|
free_basic_block_vars (void)
|
{
|
{
|
if (basic_block_info)
|
if (basic_block_info)
|
{
|
{
|
clear_edges ();
|
clear_edges ();
|
basic_block_info = NULL;
|
basic_block_info = NULL;
|
}
|
}
|
n_basic_blocks = 0;
|
n_basic_blocks = 0;
|
last_basic_block = 0;
|
last_basic_block = 0;
|
n_edges = 0;
|
n_edges = 0;
|
|
|
label_to_block_map = NULL;
|
label_to_block_map = NULL;
|
|
|
ENTRY_BLOCK_PTR->aux = NULL;
|
ENTRY_BLOCK_PTR->aux = NULL;
|
ENTRY_BLOCK_PTR->il.rtl->global_live_at_end = NULL;
|
ENTRY_BLOCK_PTR->il.rtl->global_live_at_end = NULL;
|
EXIT_BLOCK_PTR->aux = NULL;
|
EXIT_BLOCK_PTR->aux = NULL;
|
EXIT_BLOCK_PTR->il.rtl->global_live_at_start = NULL;
|
EXIT_BLOCK_PTR->il.rtl->global_live_at_start = NULL;
|
}
|
}
|
|
|
/* Delete any insns that copy a register to itself. */
|
/* Delete any insns that copy a register to itself. */
|
|
|
int
|
int
|
delete_noop_moves (void)
|
delete_noop_moves (void)
|
{
|
{
|
rtx insn, next;
|
rtx insn, next;
|
basic_block bb;
|
basic_block bb;
|
int nnoops = 0;
|
int nnoops = 0;
|
|
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
for (insn = BB_HEAD (bb); insn != NEXT_INSN (BB_END (bb)); insn = next)
|
for (insn = BB_HEAD (bb); insn != NEXT_INSN (BB_END (bb)); insn = next)
|
{
|
{
|
next = NEXT_INSN (insn);
|
next = NEXT_INSN (insn);
|
if (INSN_P (insn) && noop_move_p (insn))
|
if (INSN_P (insn) && noop_move_p (insn))
|
{
|
{
|
rtx note;
|
rtx note;
|
|
|
/* If we're about to remove the first insn of a libcall
|
/* If we're about to remove the first insn of a libcall
|
then move the libcall note to the next real insn and
|
then move the libcall note to the next real insn and
|
update the retval note. */
|
update the retval note. */
|
if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX))
|
if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX))
|
&& XEXP (note, 0) != insn)
|
&& XEXP (note, 0) != insn)
|
{
|
{
|
rtx new_libcall_insn = next_real_insn (insn);
|
rtx new_libcall_insn = next_real_insn (insn);
|
rtx retval_note = find_reg_note (XEXP (note, 0),
|
rtx retval_note = find_reg_note (XEXP (note, 0),
|
REG_RETVAL, NULL_RTX);
|
REG_RETVAL, NULL_RTX);
|
REG_NOTES (new_libcall_insn)
|
REG_NOTES (new_libcall_insn)
|
= gen_rtx_INSN_LIST (REG_LIBCALL, XEXP (note, 0),
|
= gen_rtx_INSN_LIST (REG_LIBCALL, XEXP (note, 0),
|
REG_NOTES (new_libcall_insn));
|
REG_NOTES (new_libcall_insn));
|
XEXP (retval_note, 0) = new_libcall_insn;
|
XEXP (retval_note, 0) = new_libcall_insn;
|
}
|
}
|
|
|
delete_insn_and_edges (insn);
|
delete_insn_and_edges (insn);
|
nnoops++;
|
nnoops++;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
if (nnoops && dump_file)
|
if (nnoops && dump_file)
|
fprintf (dump_file, "deleted %i noop moves\n", nnoops);
|
fprintf (dump_file, "deleted %i noop moves\n", nnoops);
|
|
|
return nnoops;
|
return nnoops;
|
}
|
}
|
|
|
/* Delete any jump tables never referenced. We can't delete them at the
|
/* Delete any jump tables never referenced. We can't delete them at the
|
time of removing tablejump insn as they are referenced by the preceding
|
time of removing tablejump insn as they are referenced by the preceding
|
insns computing the destination, so we delay deleting and garbagecollect
|
insns computing the destination, so we delay deleting and garbagecollect
|
them once life information is computed. */
|
them once life information is computed. */
|
void
|
void
|
delete_dead_jumptables (void)
|
delete_dead_jumptables (void)
|
{
|
{
|
basic_block bb;
|
basic_block bb;
|
|
|
/* A dead jump table does not belong to any basic block. Scan insns
|
/* A dead jump table does not belong to any basic block. Scan insns
|
between two adjacent basic blocks. */
|
between two adjacent basic blocks. */
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
rtx insn, next;
|
rtx insn, next;
|
|
|
for (insn = NEXT_INSN (BB_END (bb));
|
for (insn = NEXT_INSN (BB_END (bb));
|
insn && !NOTE_INSN_BASIC_BLOCK_P (insn);
|
insn && !NOTE_INSN_BASIC_BLOCK_P (insn);
|
insn = next)
|
insn = next)
|
{
|
{
|
next = NEXT_INSN (insn);
|
next = NEXT_INSN (insn);
|
if (LABEL_P (insn)
|
if (LABEL_P (insn)
|
&& LABEL_NUSES (insn) == LABEL_PRESERVE_P (insn)
|
&& LABEL_NUSES (insn) == LABEL_PRESERVE_P (insn)
|
&& JUMP_P (next)
|
&& JUMP_P (next)
|
&& (GET_CODE (PATTERN (next)) == ADDR_VEC
|
&& (GET_CODE (PATTERN (next)) == ADDR_VEC
|
|| GET_CODE (PATTERN (next)) == ADDR_DIFF_VEC))
|
|| GET_CODE (PATTERN (next)) == ADDR_DIFF_VEC))
|
{
|
{
|
rtx label = insn, jump = next;
|
rtx label = insn, jump = next;
|
|
|
if (dump_file)
|
if (dump_file)
|
fprintf (dump_file, "Dead jumptable %i removed\n",
|
fprintf (dump_file, "Dead jumptable %i removed\n",
|
INSN_UID (insn));
|
INSN_UID (insn));
|
|
|
next = NEXT_INSN (next);
|
next = NEXT_INSN (next);
|
delete_insn (jump);
|
delete_insn (jump);
|
delete_insn (label);
|
delete_insn (label);
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Determine if the stack pointer is constant over the life of the function.
|
/* Determine if the stack pointer is constant over the life of the function.
|
Only useful before prologues have been emitted. */
|
Only useful before prologues have been emitted. */
|
|
|
static void
|
static void
|
notice_stack_pointer_modification_1 (rtx x, rtx pat ATTRIBUTE_UNUSED,
|
notice_stack_pointer_modification_1 (rtx x, rtx pat ATTRIBUTE_UNUSED,
|
void *data ATTRIBUTE_UNUSED)
|
void *data ATTRIBUTE_UNUSED)
|
{
|
{
|
if (x == stack_pointer_rtx
|
if (x == stack_pointer_rtx
|
/* The stack pointer is only modified indirectly as the result
|
/* The stack pointer is only modified indirectly as the result
|
of a push until later in flow. See the comments in rtl.texi
|
of a push until later in flow. See the comments in rtl.texi
|
regarding Embedded Side-Effects on Addresses. */
|
regarding Embedded Side-Effects on Addresses. */
|
|| (MEM_P (x)
|
|| (MEM_P (x)
|
&& GET_RTX_CLASS (GET_CODE (XEXP (x, 0))) == RTX_AUTOINC
|
&& GET_RTX_CLASS (GET_CODE (XEXP (x, 0))) == RTX_AUTOINC
|
&& XEXP (XEXP (x, 0), 0) == stack_pointer_rtx))
|
&& XEXP (XEXP (x, 0), 0) == stack_pointer_rtx))
|
current_function_sp_is_unchanging = 0;
|
current_function_sp_is_unchanging = 0;
|
}
|
}
|
|
|
static void
|
static void
|
notice_stack_pointer_modification (void)
|
notice_stack_pointer_modification (void)
|
{
|
{
|
basic_block bb;
|
basic_block bb;
|
rtx insn;
|
rtx insn;
|
|
|
/* Assume that the stack pointer is unchanging if alloca hasn't
|
/* Assume that the stack pointer is unchanging if alloca hasn't
|
been used. */
|
been used. */
|
current_function_sp_is_unchanging = !current_function_calls_alloca;
|
current_function_sp_is_unchanging = !current_function_calls_alloca;
|
if (! current_function_sp_is_unchanging)
|
if (! current_function_sp_is_unchanging)
|
return;
|
return;
|
|
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
FOR_BB_INSNS (bb, insn)
|
FOR_BB_INSNS (bb, insn)
|
{
|
{
|
if (INSN_P (insn))
|
if (INSN_P (insn))
|
{
|
{
|
/* Check if insn modifies the stack pointer. */
|
/* Check if insn modifies the stack pointer. */
|
note_stores (PATTERN (insn),
|
note_stores (PATTERN (insn),
|
notice_stack_pointer_modification_1,
|
notice_stack_pointer_modification_1,
|
NULL);
|
NULL);
|
if (! current_function_sp_is_unchanging)
|
if (! current_function_sp_is_unchanging)
|
return;
|
return;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Mark a register in SET. Hard registers in large modes get all
|
/* Mark a register in SET. Hard registers in large modes get all
|
of their component registers set as well. */
|
of their component registers set as well. */
|
|
|
static void
|
static void
|
mark_reg (rtx reg, void *xset)
|
mark_reg (rtx reg, void *xset)
|
{
|
{
|
regset set = (regset) xset;
|
regset set = (regset) xset;
|
int regno = REGNO (reg);
|
int regno = REGNO (reg);
|
|
|
gcc_assert (GET_MODE (reg) != BLKmode);
|
gcc_assert (GET_MODE (reg) != BLKmode);
|
|
|
SET_REGNO_REG_SET (set, regno);
|
SET_REGNO_REG_SET (set, regno);
|
if (regno < FIRST_PSEUDO_REGISTER)
|
if (regno < FIRST_PSEUDO_REGISTER)
|
{
|
{
|
int n = hard_regno_nregs[regno][GET_MODE (reg)];
|
int n = hard_regno_nregs[regno][GET_MODE (reg)];
|
while (--n > 0)
|
while (--n > 0)
|
SET_REGNO_REG_SET (set, regno + n);
|
SET_REGNO_REG_SET (set, regno + n);
|
}
|
}
|
}
|
}
|
|
|
/* Mark those regs which are needed at the end of the function as live
|
/* Mark those regs which are needed at the end of the function as live
|
at the end of the last basic block. */
|
at the end of the last basic block. */
|
|
|
static void
|
static void
|
mark_regs_live_at_end (regset set)
|
mark_regs_live_at_end (regset set)
|
{
|
{
|
unsigned int i;
|
unsigned int i;
|
|
|
/* If exiting needs the right stack value, consider the stack pointer
|
/* If exiting needs the right stack value, consider the stack pointer
|
live at the end of the function. */
|
live at the end of the function. */
|
if ((HAVE_epilogue && epilogue_completed)
|
if ((HAVE_epilogue && epilogue_completed)
|
|| ! EXIT_IGNORE_STACK
|
|| ! EXIT_IGNORE_STACK
|
|| (! FRAME_POINTER_REQUIRED
|
|| (! FRAME_POINTER_REQUIRED
|
&& ! current_function_calls_alloca
|
&& ! current_function_calls_alloca
|
&& flag_omit_frame_pointer)
|
&& flag_omit_frame_pointer)
|
|| current_function_sp_is_unchanging)
|
|| current_function_sp_is_unchanging)
|
{
|
{
|
SET_REGNO_REG_SET (set, STACK_POINTER_REGNUM);
|
SET_REGNO_REG_SET (set, STACK_POINTER_REGNUM);
|
}
|
}
|
|
|
/* Mark the frame pointer if needed at the end of the function. If
|
/* Mark the frame pointer if needed at the end of the function. If
|
we end up eliminating it, it will be removed from the live list
|
we end up eliminating it, it will be removed from the live list
|
of each basic block by reload. */
|
of each basic block by reload. */
|
|
|
if (! reload_completed || frame_pointer_needed)
|
if (! reload_completed || frame_pointer_needed)
|
{
|
{
|
SET_REGNO_REG_SET (set, FRAME_POINTER_REGNUM);
|
SET_REGNO_REG_SET (set, FRAME_POINTER_REGNUM);
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
/* If they are different, also mark the hard frame pointer as live. */
|
/* If they are different, also mark the hard frame pointer as live. */
|
if (! LOCAL_REGNO (HARD_FRAME_POINTER_REGNUM))
|
if (! LOCAL_REGNO (HARD_FRAME_POINTER_REGNUM))
|
SET_REGNO_REG_SET (set, HARD_FRAME_POINTER_REGNUM);
|
SET_REGNO_REG_SET (set, HARD_FRAME_POINTER_REGNUM);
|
#endif
|
#endif
|
}
|
}
|
|
|
#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
|
#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
|
/* Many architectures have a GP register even without flag_pic.
|
/* Many architectures have a GP register even without flag_pic.
|
Assume the pic register is not in use, or will be handled by
|
Assume the pic register is not in use, or will be handled by
|
other means, if it is not fixed. */
|
other means, if it is not fixed. */
|
if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
|
if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
|
&& fixed_regs[PIC_OFFSET_TABLE_REGNUM])
|
&& fixed_regs[PIC_OFFSET_TABLE_REGNUM])
|
SET_REGNO_REG_SET (set, PIC_OFFSET_TABLE_REGNUM);
|
SET_REGNO_REG_SET (set, PIC_OFFSET_TABLE_REGNUM);
|
#endif
|
#endif
|
|
|
/* Mark all global registers, and all registers used by the epilogue
|
/* Mark all global registers, and all registers used by the epilogue
|
as being live at the end of the function since they may be
|
as being live at the end of the function since they may be
|
referenced by our caller. */
|
referenced by our caller. */
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (global_regs[i] || EPILOGUE_USES (i))
|
if (global_regs[i] || EPILOGUE_USES (i))
|
SET_REGNO_REG_SET (set, i);
|
SET_REGNO_REG_SET (set, i);
|
|
|
if (HAVE_epilogue && epilogue_completed)
|
if (HAVE_epilogue && epilogue_completed)
|
{
|
{
|
/* Mark all call-saved registers that we actually used. */
|
/* Mark all call-saved registers that we actually used. */
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (regs_ever_live[i] && ! LOCAL_REGNO (i)
|
if (regs_ever_live[i] && ! LOCAL_REGNO (i)
|
&& ! TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
|
&& ! TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
|
SET_REGNO_REG_SET (set, i);
|
SET_REGNO_REG_SET (set, i);
|
}
|
}
|
|
|
#ifdef EH_RETURN_DATA_REGNO
|
#ifdef EH_RETURN_DATA_REGNO
|
/* Mark the registers that will contain data for the handler. */
|
/* Mark the registers that will contain data for the handler. */
|
if (reload_completed && current_function_calls_eh_return)
|
if (reload_completed && current_function_calls_eh_return)
|
for (i = 0; ; ++i)
|
for (i = 0; ; ++i)
|
{
|
{
|
unsigned regno = EH_RETURN_DATA_REGNO(i);
|
unsigned regno = EH_RETURN_DATA_REGNO(i);
|
if (regno == INVALID_REGNUM)
|
if (regno == INVALID_REGNUM)
|
break;
|
break;
|
SET_REGNO_REG_SET (set, regno);
|
SET_REGNO_REG_SET (set, regno);
|
}
|
}
|
#endif
|
#endif
|
#ifdef EH_RETURN_STACKADJ_RTX
|
#ifdef EH_RETURN_STACKADJ_RTX
|
if ((! HAVE_epilogue || ! epilogue_completed)
|
if ((! HAVE_epilogue || ! epilogue_completed)
|
&& current_function_calls_eh_return)
|
&& current_function_calls_eh_return)
|
{
|
{
|
rtx tmp = EH_RETURN_STACKADJ_RTX;
|
rtx tmp = EH_RETURN_STACKADJ_RTX;
|
if (tmp && REG_P (tmp))
|
if (tmp && REG_P (tmp))
|
mark_reg (tmp, set);
|
mark_reg (tmp, set);
|
}
|
}
|
#endif
|
#endif
|
#ifdef EH_RETURN_HANDLER_RTX
|
#ifdef EH_RETURN_HANDLER_RTX
|
if ((! HAVE_epilogue || ! epilogue_completed)
|
if ((! HAVE_epilogue || ! epilogue_completed)
|
&& current_function_calls_eh_return)
|
&& current_function_calls_eh_return)
|
{
|
{
|
rtx tmp = EH_RETURN_HANDLER_RTX;
|
rtx tmp = EH_RETURN_HANDLER_RTX;
|
if (tmp && REG_P (tmp))
|
if (tmp && REG_P (tmp))
|
mark_reg (tmp, set);
|
mark_reg (tmp, set);
|
}
|
}
|
#endif
|
#endif
|
|
|
/* Mark function return value. */
|
/* Mark function return value. */
|
diddle_return_value (mark_reg, set);
|
diddle_return_value (mark_reg, set);
|
}
|
}
|
|
|
/* Propagate global life info around the graph of basic blocks. Begin
|
/* Propagate global life info around the graph of basic blocks. Begin
|
considering blocks with their corresponding bit set in BLOCKS_IN.
|
considering blocks with their corresponding bit set in BLOCKS_IN.
|
If BLOCKS_IN is null, consider it the universal set.
|
If BLOCKS_IN is null, consider it the universal set.
|
|
|
BLOCKS_OUT is set for every block that was changed. */
|
BLOCKS_OUT is set for every block that was changed. */
|
|
|
static void
|
static void
|
calculate_global_regs_live (sbitmap blocks_in, sbitmap blocks_out, int flags)
|
calculate_global_regs_live (sbitmap blocks_in, sbitmap blocks_out, int flags)
|
{
|
{
|
basic_block *queue, *qhead, *qtail, *qend, bb;
|
basic_block *queue, *qhead, *qtail, *qend, bb;
|
regset tmp, new_live_at_end, invalidated_by_eh_edge;
|
regset tmp, new_live_at_end, invalidated_by_eh_edge;
|
regset registers_made_dead;
|
regset registers_made_dead;
|
bool failure_strategy_required = false;
|
bool failure_strategy_required = false;
|
int *block_accesses;
|
int *block_accesses;
|
|
|
/* The registers that are modified within this in block. */
|
/* The registers that are modified within this in block. */
|
regset *local_sets;
|
regset *local_sets;
|
|
|
/* The registers that are conditionally modified within this block.
|
/* The registers that are conditionally modified within this block.
|
In other words, regs that are set only as part of a COND_EXEC. */
|
In other words, regs that are set only as part of a COND_EXEC. */
|
regset *cond_local_sets;
|
regset *cond_local_sets;
|
|
|
unsigned int i;
|
unsigned int i;
|
|
|
/* Some passes used to forget clear aux field of basic block causing
|
/* Some passes used to forget clear aux field of basic block causing
|
sick behavior here. */
|
sick behavior here. */
|
#ifdef ENABLE_CHECKING
|
#ifdef ENABLE_CHECKING
|
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
|
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
|
gcc_assert (!bb->aux);
|
gcc_assert (!bb->aux);
|
#endif
|
#endif
|
|
|
tmp = ALLOC_REG_SET (®_obstack);
|
tmp = ALLOC_REG_SET (®_obstack);
|
new_live_at_end = ALLOC_REG_SET (®_obstack);
|
new_live_at_end = ALLOC_REG_SET (®_obstack);
|
invalidated_by_eh_edge = ALLOC_REG_SET (®_obstack);
|
invalidated_by_eh_edge = ALLOC_REG_SET (®_obstack);
|
registers_made_dead = ALLOC_REG_SET (®_obstack);
|
registers_made_dead = ALLOC_REG_SET (®_obstack);
|
|
|
/* Inconveniently, this is only readily available in hard reg set form. */
|
/* Inconveniently, this is only readily available in hard reg set form. */
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i)
|
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
|
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i))
|
SET_REGNO_REG_SET (invalidated_by_eh_edge, i);
|
SET_REGNO_REG_SET (invalidated_by_eh_edge, i);
|
|
|
/* The exception handling registers die at eh edges. */
|
/* The exception handling registers die at eh edges. */
|
#ifdef EH_RETURN_DATA_REGNO
|
#ifdef EH_RETURN_DATA_REGNO
|
for (i = 0; ; ++i)
|
for (i = 0; ; ++i)
|
{
|
{
|
unsigned regno = EH_RETURN_DATA_REGNO (i);
|
unsigned regno = EH_RETURN_DATA_REGNO (i);
|
if (regno == INVALID_REGNUM)
|
if (regno == INVALID_REGNUM)
|
break;
|
break;
|
SET_REGNO_REG_SET (invalidated_by_eh_edge, regno);
|
SET_REGNO_REG_SET (invalidated_by_eh_edge, regno);
|
}
|
}
|
#endif
|
#endif
|
|
|
/* Allocate space for the sets of local properties. */
|
/* Allocate space for the sets of local properties. */
|
local_sets = XCNEWVEC (bitmap, last_basic_block);
|
local_sets = XCNEWVEC (bitmap, last_basic_block);
|
cond_local_sets = XCNEWVEC (bitmap, last_basic_block);
|
cond_local_sets = XCNEWVEC (bitmap, last_basic_block);
|
|
|
/* Create a worklist. Allocate an extra slot for the `head == tail'
|
/* Create a worklist. Allocate an extra slot for the `head == tail'
|
style test for an empty queue doesn't work with a full queue. */
|
style test for an empty queue doesn't work with a full queue. */
|
queue = XNEWVEC (basic_block, n_basic_blocks + 1);
|
queue = XNEWVEC (basic_block, n_basic_blocks + 1);
|
qtail = queue;
|
qtail = queue;
|
qhead = qend = queue + n_basic_blocks;
|
qhead = qend = queue + n_basic_blocks;
|
|
|
/* Queue the blocks set in the initial mask. Do this in reverse block
|
/* Queue the blocks set in the initial mask. Do this in reverse block
|
number order so that we are more likely for the first round to do
|
number order so that we are more likely for the first round to do
|
useful work. We use AUX non-null to flag that the block is queued. */
|
useful work. We use AUX non-null to flag that the block is queued. */
|
if (blocks_in)
|
if (blocks_in)
|
{
|
{
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
if (TEST_BIT (blocks_in, bb->index))
|
if (TEST_BIT (blocks_in, bb->index))
|
{
|
{
|
*--qhead = bb;
|
*--qhead = bb;
|
bb->aux = bb;
|
bb->aux = bb;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
*--qhead = bb;
|
*--qhead = bb;
|
bb->aux = bb;
|
bb->aux = bb;
|
}
|
}
|
}
|
}
|
|
|
block_accesses = XCNEWVEC (int, last_basic_block);
|
block_accesses = XCNEWVEC (int, last_basic_block);
|
|
|
/* We clean aux when we remove the initially-enqueued bbs, but we
|
/* We clean aux when we remove the initially-enqueued bbs, but we
|
don't enqueue ENTRY and EXIT initially, so clean them upfront and
|
don't enqueue ENTRY and EXIT initially, so clean them upfront and
|
unconditionally. */
|
unconditionally. */
|
ENTRY_BLOCK_PTR->aux = EXIT_BLOCK_PTR->aux = NULL;
|
ENTRY_BLOCK_PTR->aux = EXIT_BLOCK_PTR->aux = NULL;
|
|
|
if (blocks_out)
|
if (blocks_out)
|
sbitmap_zero (blocks_out);
|
sbitmap_zero (blocks_out);
|
|
|
/* We work through the queue until there are no more blocks. What
|
/* We work through the queue until there are no more blocks. What
|
is live at the end of this block is precisely the union of what
|
is live at the end of this block is precisely the union of what
|
is live at the beginning of all its successors. So, we set its
|
is live at the beginning of all its successors. So, we set its
|
GLOBAL_LIVE_AT_END field based on the GLOBAL_LIVE_AT_START field
|
GLOBAL_LIVE_AT_END field based on the GLOBAL_LIVE_AT_START field
|
for its successors. Then, we compute GLOBAL_LIVE_AT_START for
|
for its successors. Then, we compute GLOBAL_LIVE_AT_START for
|
this block by walking through the instructions in this block in
|
this block by walking through the instructions in this block in
|
reverse order and updating as we go. If that changed
|
reverse order and updating as we go. If that changed
|
GLOBAL_LIVE_AT_START, we add the predecessors of the block to the
|
GLOBAL_LIVE_AT_START, we add the predecessors of the block to the
|
queue; they will now need to recalculate GLOBAL_LIVE_AT_END.
|
queue; they will now need to recalculate GLOBAL_LIVE_AT_END.
|
|
|
We are guaranteed to terminate, because GLOBAL_LIVE_AT_START
|
We are guaranteed to terminate, because GLOBAL_LIVE_AT_START
|
never shrinks. If a register appears in GLOBAL_LIVE_AT_START, it
|
never shrinks. If a register appears in GLOBAL_LIVE_AT_START, it
|
must either be live at the end of the block, or used within the
|
must either be live at the end of the block, or used within the
|
block. In the latter case, it will certainly never disappear
|
block. In the latter case, it will certainly never disappear
|
from GLOBAL_LIVE_AT_START. In the former case, the register
|
from GLOBAL_LIVE_AT_START. In the former case, the register
|
could go away only if it disappeared from GLOBAL_LIVE_AT_START
|
could go away only if it disappeared from GLOBAL_LIVE_AT_START
|
for one of the successor blocks. By induction, that cannot
|
for one of the successor blocks. By induction, that cannot
|
occur.
|
occur.
|
|
|
??? This reasoning doesn't work if we start from non-empty initial
|
??? This reasoning doesn't work if we start from non-empty initial
|
GLOBAL_LIVE_AT_START sets. And there are actually two problems:
|
GLOBAL_LIVE_AT_START sets. And there are actually two problems:
|
1) Updating may not terminate (endless oscillation).
|
1) Updating may not terminate (endless oscillation).
|
2) Even if it does (and it usually does), the resulting information
|
2) Even if it does (and it usually does), the resulting information
|
may be inaccurate. Consider for example the following case:
|
may be inaccurate. Consider for example the following case:
|
|
|
a = ...;
|
a = ...;
|
while (...) {...} -- 'a' not mentioned at all
|
while (...) {...} -- 'a' not mentioned at all
|
... = a;
|
... = a;
|
|
|
If the use of 'a' is deleted between two calculations of liveness
|
If the use of 'a' is deleted between two calculations of liveness
|
information and the initial sets are not cleared, the information
|
information and the initial sets are not cleared, the information
|
about a's liveness will get stuck inside the loop and the set will
|
about a's liveness will get stuck inside the loop and the set will
|
appear not to be dead.
|
appear not to be dead.
|
|
|
We do not attempt to solve 2) -- the information is conservatively
|
We do not attempt to solve 2) -- the information is conservatively
|
correct (i.e. we never claim that something live is dead) and the
|
correct (i.e. we never claim that something live is dead) and the
|
amount of optimization opportunities missed due to this problem is
|
amount of optimization opportunities missed due to this problem is
|
not significant.
|
not significant.
|
|
|
1) is more serious. In order to fix it, we monitor the number of times
|
1) is more serious. In order to fix it, we monitor the number of times
|
each block is processed. Once one of the blocks has been processed more
|
each block is processed. Once one of the blocks has been processed more
|
times than the maximum number of rounds, we use the following strategy:
|
times than the maximum number of rounds, we use the following strategy:
|
When a register disappears from one of the sets, we add it to a MAKE_DEAD
|
When a register disappears from one of the sets, we add it to a MAKE_DEAD
|
set, remove all registers in this set from all GLOBAL_LIVE_AT_* sets and
|
set, remove all registers in this set from all GLOBAL_LIVE_AT_* sets and
|
add the blocks with changed sets into the queue. Thus we are guaranteed
|
add the blocks with changed sets into the queue. Thus we are guaranteed
|
to terminate (the worst case corresponds to all registers in MADE_DEAD,
|
to terminate (the worst case corresponds to all registers in MADE_DEAD,
|
in which case the original reasoning above is valid), but in general we
|
in which case the original reasoning above is valid), but in general we
|
only fix up a few offending registers.
|
only fix up a few offending registers.
|
|
|
The maximum number of rounds for computing liveness is the largest of
|
The maximum number of rounds for computing liveness is the largest of
|
MAX_LIVENESS_ROUNDS and the latest loop depth count for this function. */
|
MAX_LIVENESS_ROUNDS and the latest loop depth count for this function. */
|
|
|
while (qhead != qtail)
|
while (qhead != qtail)
|
{
|
{
|
int rescan, changed;
|
int rescan, changed;
|
basic_block bb;
|
basic_block bb;
|
edge e;
|
edge e;
|
edge_iterator ei;
|
edge_iterator ei;
|
|
|
bb = *qhead++;
|
bb = *qhead++;
|
if (qhead == qend)
|
if (qhead == qend)
|
qhead = queue;
|
qhead = queue;
|
bb->aux = NULL;
|
bb->aux = NULL;
|
|
|
/* Should we start using the failure strategy? */
|
/* Should we start using the failure strategy? */
|
if (bb != ENTRY_BLOCK_PTR)
|
if (bb != ENTRY_BLOCK_PTR)
|
{
|
{
|
int max_liveness_rounds =
|
int max_liveness_rounds =
|
MAX (MAX_LIVENESS_ROUNDS, cfun->max_loop_depth);
|
MAX (MAX_LIVENESS_ROUNDS, cfun->max_loop_depth);
|
|
|
block_accesses[bb->index]++;
|
block_accesses[bb->index]++;
|
if (block_accesses[bb->index] > max_liveness_rounds)
|
if (block_accesses[bb->index] > max_liveness_rounds)
|
failure_strategy_required = true;
|
failure_strategy_required = true;
|
}
|
}
|
|
|
/* Begin by propagating live_at_start from the successor blocks. */
|
/* Begin by propagating live_at_start from the successor blocks. */
|
CLEAR_REG_SET (new_live_at_end);
|
CLEAR_REG_SET (new_live_at_end);
|
|
|
if (EDGE_COUNT (bb->succs) > 0)
|
if (EDGE_COUNT (bb->succs) > 0)
|
FOR_EACH_EDGE (e, ei, bb->succs)
|
FOR_EACH_EDGE (e, ei, bb->succs)
|
{
|
{
|
basic_block sb = e->dest;
|
basic_block sb = e->dest;
|
|
|
/* Call-clobbered registers die across exception and
|
/* Call-clobbered registers die across exception and
|
call edges. */
|
call edges. */
|
/* ??? Abnormal call edges ignored for the moment, as this gets
|
/* ??? Abnormal call edges ignored for the moment, as this gets
|
confused by sibling call edges, which crashes reg-stack. */
|
confused by sibling call edges, which crashes reg-stack. */
|
if (e->flags & EDGE_EH)
|
if (e->flags & EDGE_EH)
|
bitmap_ior_and_compl_into (new_live_at_end,
|
bitmap_ior_and_compl_into (new_live_at_end,
|
sb->il.rtl->global_live_at_start,
|
sb->il.rtl->global_live_at_start,
|
invalidated_by_eh_edge);
|
invalidated_by_eh_edge);
|
else
|
else
|
IOR_REG_SET (new_live_at_end, sb->il.rtl->global_live_at_start);
|
IOR_REG_SET (new_live_at_end, sb->il.rtl->global_live_at_start);
|
|
|
/* If a target saves one register in another (instead of on
|
/* If a target saves one register in another (instead of on
|
the stack) the save register will need to be live for EH. */
|
the stack) the save register will need to be live for EH. */
|
if (e->flags & EDGE_EH)
|
if (e->flags & EDGE_EH)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (EH_USES (i))
|
if (EH_USES (i))
|
SET_REGNO_REG_SET (new_live_at_end, i);
|
SET_REGNO_REG_SET (new_live_at_end, i);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* This might be a noreturn function that throws. And
|
/* This might be a noreturn function that throws. And
|
even if it isn't, getting the unwind info right helps
|
even if it isn't, getting the unwind info right helps
|
debugging. */
|
debugging. */
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (EH_USES (i))
|
if (EH_USES (i))
|
SET_REGNO_REG_SET (new_live_at_end, i);
|
SET_REGNO_REG_SET (new_live_at_end, i);
|
}
|
}
|
|
|
/* The all-important stack pointer must always be live. */
|
/* The all-important stack pointer must always be live. */
|
SET_REGNO_REG_SET (new_live_at_end, STACK_POINTER_REGNUM);
|
SET_REGNO_REG_SET (new_live_at_end, STACK_POINTER_REGNUM);
|
|
|
/* Before reload, there are a few registers that must be forced
|
/* Before reload, there are a few registers that must be forced
|
live everywhere -- which might not already be the case for
|
live everywhere -- which might not already be the case for
|
blocks within infinite loops. */
|
blocks within infinite loops. */
|
if (! reload_completed)
|
if (! reload_completed)
|
{
|
{
|
/* Any reference to any pseudo before reload is a potential
|
/* Any reference to any pseudo before reload is a potential
|
reference of the frame pointer. */
|
reference of the frame pointer. */
|
SET_REGNO_REG_SET (new_live_at_end, FRAME_POINTER_REGNUM);
|
SET_REGNO_REG_SET (new_live_at_end, FRAME_POINTER_REGNUM);
|
|
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
/* Pseudos with argument area equivalences may require
|
/* Pseudos with argument area equivalences may require
|
reloading via the argument pointer. */
|
reloading via the argument pointer. */
|
if (fixed_regs[ARG_POINTER_REGNUM])
|
if (fixed_regs[ARG_POINTER_REGNUM])
|
SET_REGNO_REG_SET (new_live_at_end, ARG_POINTER_REGNUM);
|
SET_REGNO_REG_SET (new_live_at_end, ARG_POINTER_REGNUM);
|
#endif
|
#endif
|
|
|
/* Any constant, or pseudo with constant equivalences, may
|
/* Any constant, or pseudo with constant equivalences, may
|
require reloading from memory using the pic register. */
|
require reloading from memory using the pic register. */
|
if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
|
if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
|
&& fixed_regs[PIC_OFFSET_TABLE_REGNUM])
|
&& fixed_regs[PIC_OFFSET_TABLE_REGNUM])
|
SET_REGNO_REG_SET (new_live_at_end, PIC_OFFSET_TABLE_REGNUM);
|
SET_REGNO_REG_SET (new_live_at_end, PIC_OFFSET_TABLE_REGNUM);
|
}
|
}
|
|
|
if (bb == ENTRY_BLOCK_PTR)
|
if (bb == ENTRY_BLOCK_PTR)
|
{
|
{
|
COPY_REG_SET (bb->il.rtl->global_live_at_end, new_live_at_end);
|
COPY_REG_SET (bb->il.rtl->global_live_at_end, new_live_at_end);
|
continue;
|
continue;
|
}
|
}
|
|
|
/* On our first pass through this block, we'll go ahead and continue.
|
/* On our first pass through this block, we'll go ahead and continue.
|
Recognize first pass by checking if local_set is NULL for this
|
Recognize first pass by checking if local_set is NULL for this
|
basic block. On subsequent passes, we get to skip out early if
|
basic block. On subsequent passes, we get to skip out early if
|
live_at_end wouldn't have changed. */
|
live_at_end wouldn't have changed. */
|
|
|
if (local_sets[bb->index] == NULL)
|
if (local_sets[bb->index] == NULL)
|
{
|
{
|
local_sets[bb->index] = ALLOC_REG_SET (®_obstack);
|
local_sets[bb->index] = ALLOC_REG_SET (®_obstack);
|
cond_local_sets[bb->index] = ALLOC_REG_SET (®_obstack);
|
cond_local_sets[bb->index] = ALLOC_REG_SET (®_obstack);
|
rescan = 1;
|
rescan = 1;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* If any bits were removed from live_at_end, we'll have to
|
/* If any bits were removed from live_at_end, we'll have to
|
rescan the block. This wouldn't be necessary if we had
|
rescan the block. This wouldn't be necessary if we had
|
precalculated local_live, however with PROP_SCAN_DEAD_CODE
|
precalculated local_live, however with PROP_SCAN_DEAD_CODE
|
local_live is really dependent on live_at_end. */
|
local_live is really dependent on live_at_end. */
|
rescan = bitmap_intersect_compl_p (bb->il.rtl->global_live_at_end,
|
rescan = bitmap_intersect_compl_p (bb->il.rtl->global_live_at_end,
|
new_live_at_end);
|
new_live_at_end);
|
|
|
if (!rescan)
|
if (!rescan)
|
{
|
{
|
regset cond_local_set;
|
regset cond_local_set;
|
|
|
/* If any of the registers in the new live_at_end set are
|
/* If any of the registers in the new live_at_end set are
|
conditionally set in this basic block, we must rescan.
|
conditionally set in this basic block, we must rescan.
|
This is because conditional lifetimes at the end of the
|
This is because conditional lifetimes at the end of the
|
block do not just take the live_at_end set into
|
block do not just take the live_at_end set into
|
account, but also the liveness at the start of each
|
account, but also the liveness at the start of each
|
successor block. We can miss changes in those sets if
|
successor block. We can miss changes in those sets if
|
we only compare the new live_at_end against the
|
we only compare the new live_at_end against the
|
previous one. */
|
previous one. */
|
cond_local_set = cond_local_sets[bb->index];
|
cond_local_set = cond_local_sets[bb->index];
|
rescan = bitmap_intersect_p (new_live_at_end, cond_local_set);
|
rescan = bitmap_intersect_p (new_live_at_end, cond_local_set);
|
}
|
}
|
|
|
if (!rescan)
|
if (!rescan)
|
{
|
{
|
regset local_set;
|
regset local_set;
|
|
|
/* Find the set of changed bits. Take this opportunity
|
/* Find the set of changed bits. Take this opportunity
|
to notice that this set is empty and early out. */
|
to notice that this set is empty and early out. */
|
bitmap_xor (tmp, bb->il.rtl->global_live_at_end, new_live_at_end);
|
bitmap_xor (tmp, bb->il.rtl->global_live_at_end, new_live_at_end);
|
if (bitmap_empty_p (tmp))
|
if (bitmap_empty_p (tmp))
|
continue;
|
continue;
|
|
|
/* If any of the changed bits overlap with local_sets[bb],
|
/* If any of the changed bits overlap with local_sets[bb],
|
we'll have to rescan the block. */
|
we'll have to rescan the block. */
|
local_set = local_sets[bb->index];
|
local_set = local_sets[bb->index];
|
rescan = bitmap_intersect_p (tmp, local_set);
|
rescan = bitmap_intersect_p (tmp, local_set);
|
}
|
}
|
}
|
}
|
|
|
/* Let our caller know that BB changed enough to require its
|
/* Let our caller know that BB changed enough to require its
|
death notes updated. */
|
death notes updated. */
|
if (blocks_out)
|
if (blocks_out)
|
SET_BIT (blocks_out, bb->index);
|
SET_BIT (blocks_out, bb->index);
|
|
|
if (! rescan)
|
if (! rescan)
|
{
|
{
|
/* Add to live_at_start the set of all registers in
|
/* Add to live_at_start the set of all registers in
|
new_live_at_end that aren't in the old live_at_end. */
|
new_live_at_end that aren't in the old live_at_end. */
|
|
|
changed = bitmap_ior_and_compl_into (bb->il.rtl->global_live_at_start,
|
changed = bitmap_ior_and_compl_into (bb->il.rtl->global_live_at_start,
|
new_live_at_end,
|
new_live_at_end,
|
bb->il.rtl->global_live_at_end);
|
bb->il.rtl->global_live_at_end);
|
COPY_REG_SET (bb->il.rtl->global_live_at_end, new_live_at_end);
|
COPY_REG_SET (bb->il.rtl->global_live_at_end, new_live_at_end);
|
if (! changed)
|
if (! changed)
|
continue;
|
continue;
|
}
|
}
|
else
|
else
|
{
|
{
|
COPY_REG_SET (bb->il.rtl->global_live_at_end, new_live_at_end);
|
COPY_REG_SET (bb->il.rtl->global_live_at_end, new_live_at_end);
|
|
|
/* Rescan the block insn by insn to turn (a copy of) live_at_end
|
/* Rescan the block insn by insn to turn (a copy of) live_at_end
|
into live_at_start. */
|
into live_at_start. */
|
propagate_block (bb, new_live_at_end,
|
propagate_block (bb, new_live_at_end,
|
local_sets[bb->index],
|
local_sets[bb->index],
|
cond_local_sets[bb->index],
|
cond_local_sets[bb->index],
|
flags);
|
flags);
|
|
|
/* If live_at start didn't change, no need to go farther. */
|
/* If live_at start didn't change, no need to go farther. */
|
if (REG_SET_EQUAL_P (bb->il.rtl->global_live_at_start,
|
if (REG_SET_EQUAL_P (bb->il.rtl->global_live_at_start,
|
new_live_at_end))
|
new_live_at_end))
|
continue;
|
continue;
|
|
|
if (failure_strategy_required)
|
if (failure_strategy_required)
|
{
|
{
|
/* Get the list of registers that were removed from the
|
/* Get the list of registers that were removed from the
|
bb->global_live_at_start set. */
|
bb->global_live_at_start set. */
|
bitmap_and_compl (tmp, bb->il.rtl->global_live_at_start,
|
bitmap_and_compl (tmp, bb->il.rtl->global_live_at_start,
|
new_live_at_end);
|
new_live_at_end);
|
if (!bitmap_empty_p (tmp))
|
if (!bitmap_empty_p (tmp))
|
{
|
{
|
bool pbb_changed;
|
bool pbb_changed;
|
basic_block pbb;
|
basic_block pbb;
|
|
|
/* It should not happen that one of registers we have
|
/* It should not happen that one of registers we have
|
removed last time is disappears again before any other
|
removed last time is disappears again before any other
|
register does. */
|
register does. */
|
pbb_changed = bitmap_ior_into (registers_made_dead, tmp);
|
pbb_changed = bitmap_ior_into (registers_made_dead, tmp);
|
gcc_assert (pbb_changed);
|
gcc_assert (pbb_changed);
|
|
|
/* Now remove the registers from all sets. */
|
/* Now remove the registers from all sets. */
|
FOR_EACH_BB (pbb)
|
FOR_EACH_BB (pbb)
|
{
|
{
|
pbb_changed = false;
|
pbb_changed = false;
|
|
|
pbb_changed
|
pbb_changed
|
|= bitmap_and_compl_into
|
|= bitmap_and_compl_into
|
(pbb->il.rtl->global_live_at_start,
|
(pbb->il.rtl->global_live_at_start,
|
registers_made_dead);
|
registers_made_dead);
|
pbb_changed
|
pbb_changed
|
|= bitmap_and_compl_into
|
|= bitmap_and_compl_into
|
(pbb->il.rtl->global_live_at_end,
|
(pbb->il.rtl->global_live_at_end,
|
registers_made_dead);
|
registers_made_dead);
|
if (!pbb_changed)
|
if (!pbb_changed)
|
continue;
|
continue;
|
|
|
/* Note the (possible) change. */
|
/* Note the (possible) change. */
|
if (blocks_out)
|
if (blocks_out)
|
SET_BIT (blocks_out, pbb->index);
|
SET_BIT (blocks_out, pbb->index);
|
|
|
/* Makes sure to really rescan the block. */
|
/* Makes sure to really rescan the block. */
|
if (local_sets[pbb->index])
|
if (local_sets[pbb->index])
|
{
|
{
|
FREE_REG_SET (local_sets[pbb->index]);
|
FREE_REG_SET (local_sets[pbb->index]);
|
FREE_REG_SET (cond_local_sets[pbb->index]);
|
FREE_REG_SET (cond_local_sets[pbb->index]);
|
local_sets[pbb->index] = 0;
|
local_sets[pbb->index] = 0;
|
}
|
}
|
|
|
/* Add it to the queue. */
|
/* Add it to the queue. */
|
if (pbb->aux == NULL)
|
if (pbb->aux == NULL)
|
{
|
{
|
*qtail++ = pbb;
|
*qtail++ = pbb;
|
if (qtail == qend)
|
if (qtail == qend)
|
qtail = queue;
|
qtail = queue;
|
pbb->aux = pbb;
|
pbb->aux = pbb;
|
}
|
}
|
}
|
}
|
continue;
|
continue;
|
}
|
}
|
} /* end of failure_strategy_required */
|
} /* end of failure_strategy_required */
|
|
|
COPY_REG_SET (bb->il.rtl->global_live_at_start, new_live_at_end);
|
COPY_REG_SET (bb->il.rtl->global_live_at_start, new_live_at_end);
|
}
|
}
|
|
|
/* Queue all predecessors of BB so that we may re-examine
|
/* Queue all predecessors of BB so that we may re-examine
|
their live_at_end. */
|
their live_at_end. */
|
FOR_EACH_EDGE (e, ei, bb->preds)
|
FOR_EACH_EDGE (e, ei, bb->preds)
|
{
|
{
|
basic_block pb = e->src;
|
basic_block pb = e->src;
|
|
|
gcc_assert ((e->flags & EDGE_FAKE) == 0);
|
gcc_assert ((e->flags & EDGE_FAKE) == 0);
|
|
|
if (pb->aux == NULL)
|
if (pb->aux == NULL)
|
{
|
{
|
*qtail++ = pb;
|
*qtail++ = pb;
|
if (qtail == qend)
|
if (qtail == qend)
|
qtail = queue;
|
qtail = queue;
|
pb->aux = pb;
|
pb->aux = pb;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
FREE_REG_SET (tmp);
|
FREE_REG_SET (tmp);
|
FREE_REG_SET (new_live_at_end);
|
FREE_REG_SET (new_live_at_end);
|
FREE_REG_SET (invalidated_by_eh_edge);
|
FREE_REG_SET (invalidated_by_eh_edge);
|
FREE_REG_SET (registers_made_dead);
|
FREE_REG_SET (registers_made_dead);
|
|
|
if (blocks_out)
|
if (blocks_out)
|
{
|
{
|
sbitmap_iterator sbi;
|
sbitmap_iterator sbi;
|
|
|
EXECUTE_IF_SET_IN_SBITMAP (blocks_out, 0, i, sbi)
|
EXECUTE_IF_SET_IN_SBITMAP (blocks_out, 0, i, sbi)
|
{
|
{
|
basic_block bb = BASIC_BLOCK (i);
|
basic_block bb = BASIC_BLOCK (i);
|
FREE_REG_SET (local_sets[bb->index]);
|
FREE_REG_SET (local_sets[bb->index]);
|
FREE_REG_SET (cond_local_sets[bb->index]);
|
FREE_REG_SET (cond_local_sets[bb->index]);
|
};
|
};
|
}
|
}
|
else
|
else
|
{
|
{
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
FREE_REG_SET (local_sets[bb->index]);
|
FREE_REG_SET (local_sets[bb->index]);
|
FREE_REG_SET (cond_local_sets[bb->index]);
|
FREE_REG_SET (cond_local_sets[bb->index]);
|
}
|
}
|
}
|
}
|
|
|
free (block_accesses);
|
free (block_accesses);
|
free (queue);
|
free (queue);
|
free (cond_local_sets);
|
free (cond_local_sets);
|
free (local_sets);
|
free (local_sets);
|
}
|
}
|
|
|
|
|
/* This structure is used to pass parameters to and from the
|
/* This structure is used to pass parameters to and from the
|
the function find_regno_partial(). It is used to pass in the
|
the function find_regno_partial(). It is used to pass in the
|
register number we are looking, as well as to return any rtx
|
register number we are looking, as well as to return any rtx
|
we find. */
|
we find. */
|
|
|
typedef struct {
|
typedef struct {
|
unsigned regno_to_find;
|
unsigned regno_to_find;
|
rtx retval;
|
rtx retval;
|
} find_regno_partial_param;
|
} find_regno_partial_param;
|
|
|
|
|
/* Find the rtx for the reg numbers specified in 'data' if it is
|
/* Find the rtx for the reg numbers specified in 'data' if it is
|
part of an expression which only uses part of the register. Return
|
part of an expression which only uses part of the register. Return
|
it in the structure passed in. */
|
it in the structure passed in. */
|
static int
|
static int
|
find_regno_partial (rtx *ptr, void *data)
|
find_regno_partial (rtx *ptr, void *data)
|
{
|
{
|
find_regno_partial_param *param = (find_regno_partial_param *)data;
|
find_regno_partial_param *param = (find_regno_partial_param *)data;
|
unsigned reg = param->regno_to_find;
|
unsigned reg = param->regno_to_find;
|
param->retval = NULL_RTX;
|
param->retval = NULL_RTX;
|
|
|
if (*ptr == NULL_RTX)
|
if (*ptr == NULL_RTX)
|
return 0;
|
return 0;
|
|
|
switch (GET_CODE (*ptr))
|
switch (GET_CODE (*ptr))
|
{
|
{
|
case ZERO_EXTRACT:
|
case ZERO_EXTRACT:
|
case SIGN_EXTRACT:
|
case SIGN_EXTRACT:
|
case STRICT_LOW_PART:
|
case STRICT_LOW_PART:
|
if (REG_P (XEXP (*ptr, 0)) && REGNO (XEXP (*ptr, 0)) == reg)
|
if (REG_P (XEXP (*ptr, 0)) && REGNO (XEXP (*ptr, 0)) == reg)
|
{
|
{
|
param->retval = XEXP (*ptr, 0);
|
param->retval = XEXP (*ptr, 0);
|
return 1;
|
return 1;
|
}
|
}
|
break;
|
break;
|
|
|
case SUBREG:
|
case SUBREG:
|
if (REG_P (SUBREG_REG (*ptr))
|
if (REG_P (SUBREG_REG (*ptr))
|
&& REGNO (SUBREG_REG (*ptr)) == reg)
|
&& REGNO (SUBREG_REG (*ptr)) == reg)
|
{
|
{
|
param->retval = SUBREG_REG (*ptr);
|
param->retval = SUBREG_REG (*ptr);
|
return 1;
|
return 1;
|
}
|
}
|
break;
|
break;
|
|
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Process all immediate successors of the entry block looking for pseudo
|
/* Process all immediate successors of the entry block looking for pseudo
|
registers which are live on entry. Find all of those whose first
|
registers which are live on entry. Find all of those whose first
|
instance is a partial register reference of some kind, and initialize
|
instance is a partial register reference of some kind, and initialize
|
them to 0 after the entry block. This will prevent bit sets within
|
them to 0 after the entry block. This will prevent bit sets within
|
registers whose value is unknown, and may contain some kind of sticky
|
registers whose value is unknown, and may contain some kind of sticky
|
bits we don't want. */
|
bits we don't want. */
|
|
|
static int
|
static int
|
initialize_uninitialized_subregs (void)
|
initialize_uninitialized_subregs (void)
|
{
|
{
|
rtx insn;
|
rtx insn;
|
edge e;
|
edge e;
|
unsigned reg, did_something = 0;
|
unsigned reg, did_something = 0;
|
find_regno_partial_param param;
|
find_regno_partial_param param;
|
edge_iterator ei;
|
edge_iterator ei;
|
|
|
FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
|
FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
|
{
|
{
|
basic_block bb = e->dest;
|
basic_block bb = e->dest;
|
regset map = bb->il.rtl->global_live_at_start;
|
regset map = bb->il.rtl->global_live_at_start;
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
EXECUTE_IF_SET_IN_REG_SET (map, FIRST_PSEUDO_REGISTER, reg, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (map, FIRST_PSEUDO_REGISTER, reg, rsi)
|
{
|
{
|
int uid = REGNO_FIRST_UID (reg);
|
int uid = REGNO_FIRST_UID (reg);
|
rtx i;
|
rtx i;
|
|
|
/* Find an insn which mentions the register we are looking for.
|
/* Find an insn which mentions the register we are looking for.
|
Its preferable to have an instance of the register's rtl since
|
Its preferable to have an instance of the register's rtl since
|
there may be various flags set which we need to duplicate.
|
there may be various flags set which we need to duplicate.
|
If we can't find it, its probably an automatic whose initial
|
If we can't find it, its probably an automatic whose initial
|
value doesn't matter, or hopefully something we don't care about. */
|
value doesn't matter, or hopefully something we don't care about. */
|
for (i = get_insns (); i && INSN_UID (i) != uid; i = NEXT_INSN (i))
|
for (i = get_insns (); i && INSN_UID (i) != uid; i = NEXT_INSN (i))
|
;
|
;
|
if (i != NULL_RTX)
|
if (i != NULL_RTX)
|
{
|
{
|
/* Found the insn, now get the REG rtx, if we can. */
|
/* Found the insn, now get the REG rtx, if we can. */
|
param.regno_to_find = reg;
|
param.regno_to_find = reg;
|
for_each_rtx (&i, find_regno_partial, ¶m);
|
for_each_rtx (&i, find_regno_partial, ¶m);
|
if (param.retval != NULL_RTX)
|
if (param.retval != NULL_RTX)
|
{
|
{
|
start_sequence ();
|
start_sequence ();
|
emit_move_insn (param.retval,
|
emit_move_insn (param.retval,
|
CONST0_RTX (GET_MODE (param.retval)));
|
CONST0_RTX (GET_MODE (param.retval)));
|
insn = get_insns ();
|
insn = get_insns ();
|
end_sequence ();
|
end_sequence ();
|
insert_insn_on_edge (insn, e);
|
insert_insn_on_edge (insn, e);
|
did_something = 1;
|
did_something = 1;
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
if (did_something)
|
if (did_something)
|
commit_edge_insertions ();
|
commit_edge_insertions ();
|
return did_something;
|
return did_something;
|
}
|
}
|
|
|
|
|
/* Subroutines of life analysis. */
|
/* Subroutines of life analysis. */
|
|
|
/* Allocate the permanent data structures that represent the results
|
/* Allocate the permanent data structures that represent the results
|
of life analysis. */
|
of life analysis. */
|
|
|
static void
|
static void
|
allocate_bb_life_data (void)
|
allocate_bb_life_data (void)
|
{
|
{
|
basic_block bb;
|
basic_block bb;
|
|
|
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
|
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
|
{
|
{
|
if (bb->il.rtl->global_live_at_start)
|
if (bb->il.rtl->global_live_at_start)
|
{
|
{
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_start);
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_start);
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_end);
|
CLEAR_REG_SET (bb->il.rtl->global_live_at_end);
|
}
|
}
|
else
|
else
|
{
|
{
|
bb->il.rtl->global_live_at_start = ALLOC_REG_SET (®_obstack);
|
bb->il.rtl->global_live_at_start = ALLOC_REG_SET (®_obstack);
|
bb->il.rtl->global_live_at_end = ALLOC_REG_SET (®_obstack);
|
bb->il.rtl->global_live_at_end = ALLOC_REG_SET (®_obstack);
|
}
|
}
|
}
|
}
|
|
|
regs_live_at_setjmp = ALLOC_REG_SET (®_obstack);
|
regs_live_at_setjmp = ALLOC_REG_SET (®_obstack);
|
}
|
}
|
|
|
void
|
void
|
allocate_reg_life_data (void)
|
allocate_reg_life_data (void)
|
{
|
{
|
int i;
|
int i;
|
|
|
max_regno = max_reg_num ();
|
max_regno = max_reg_num ();
|
gcc_assert (!reg_deaths);
|
gcc_assert (!reg_deaths);
|
reg_deaths = XCNEWVEC (int, max_regno);
|
reg_deaths = XCNEWVEC (int, max_regno);
|
|
|
/* Recalculate the register space, in case it has grown. Old style
|
/* Recalculate the register space, in case it has grown. Old style
|
vector oriented regsets would set regset_{size,bytes} here also. */
|
vector oriented regsets would set regset_{size,bytes} here also. */
|
allocate_reg_info (max_regno, FALSE, FALSE);
|
allocate_reg_info (max_regno, FALSE, FALSE);
|
|
|
/* Reset all the data we'll collect in propagate_block and its
|
/* Reset all the data we'll collect in propagate_block and its
|
subroutines. */
|
subroutines. */
|
for (i = 0; i < max_regno; i++)
|
for (i = 0; i < max_regno; i++)
|
{
|
{
|
REG_N_SETS (i) = 0;
|
REG_N_SETS (i) = 0;
|
REG_N_REFS (i) = 0;
|
REG_N_REFS (i) = 0;
|
REG_N_DEATHS (i) = 0;
|
REG_N_DEATHS (i) = 0;
|
REG_N_CALLS_CROSSED (i) = 0;
|
REG_N_CALLS_CROSSED (i) = 0;
|
REG_N_THROWING_CALLS_CROSSED (i) = 0;
|
REG_N_THROWING_CALLS_CROSSED (i) = 0;
|
REG_LIVE_LENGTH (i) = 0;
|
REG_LIVE_LENGTH (i) = 0;
|
REG_FREQ (i) = 0;
|
REG_FREQ (i) = 0;
|
REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
|
REG_BASIC_BLOCK (i) = REG_BLOCK_UNKNOWN;
|
}
|
}
|
}
|
}
|
|
|
/* Delete dead instructions for propagate_block. */
|
/* Delete dead instructions for propagate_block. */
|
|
|
static void
|
static void
|
propagate_block_delete_insn (rtx insn)
|
propagate_block_delete_insn (rtx insn)
|
{
|
{
|
rtx inote = find_reg_note (insn, REG_LABEL, NULL_RTX);
|
rtx inote = find_reg_note (insn, REG_LABEL, NULL_RTX);
|
|
|
/* If the insn referred to a label, and that label was attached to
|
/* If the insn referred to a label, and that label was attached to
|
an ADDR_VEC, it's safe to delete the ADDR_VEC. In fact, it's
|
an ADDR_VEC, it's safe to delete the ADDR_VEC. In fact, it's
|
pretty much mandatory to delete it, because the ADDR_VEC may be
|
pretty much mandatory to delete it, because the ADDR_VEC may be
|
referencing labels that no longer exist.
|
referencing labels that no longer exist.
|
|
|
INSN may reference a deleted label, particularly when a jump
|
INSN may reference a deleted label, particularly when a jump
|
table has been optimized into a direct jump. There's no
|
table has been optimized into a direct jump. There's no
|
real good way to fix up the reference to the deleted label
|
real good way to fix up the reference to the deleted label
|
when the label is deleted, so we just allow it here. */
|
when the label is deleted, so we just allow it here. */
|
|
|
if (inote && LABEL_P (inote))
|
if (inote && LABEL_P (inote))
|
{
|
{
|
rtx label = XEXP (inote, 0);
|
rtx label = XEXP (inote, 0);
|
rtx next;
|
rtx next;
|
|
|
/* The label may be forced if it has been put in the constant
|
/* The label may be forced if it has been put in the constant
|
pool. If that is the only use we must discard the table
|
pool. If that is the only use we must discard the table
|
jump following it, but not the label itself. */
|
jump following it, but not the label itself. */
|
if (LABEL_NUSES (label) == 1 + LABEL_PRESERVE_P (label)
|
if (LABEL_NUSES (label) == 1 + LABEL_PRESERVE_P (label)
|
&& (next = next_nonnote_insn (label)) != NULL
|
&& (next = next_nonnote_insn (label)) != NULL
|
&& JUMP_P (next)
|
&& JUMP_P (next)
|
&& (GET_CODE (PATTERN (next)) == ADDR_VEC
|
&& (GET_CODE (PATTERN (next)) == ADDR_VEC
|
|| GET_CODE (PATTERN (next)) == ADDR_DIFF_VEC))
|
|| GET_CODE (PATTERN (next)) == ADDR_DIFF_VEC))
|
{
|
{
|
rtx pat = PATTERN (next);
|
rtx pat = PATTERN (next);
|
int diff_vec_p = GET_CODE (pat) == ADDR_DIFF_VEC;
|
int diff_vec_p = GET_CODE (pat) == ADDR_DIFF_VEC;
|
int len = XVECLEN (pat, diff_vec_p);
|
int len = XVECLEN (pat, diff_vec_p);
|
int i;
|
int i;
|
|
|
for (i = 0; i < len; i++)
|
for (i = 0; i < len; i++)
|
LABEL_NUSES (XEXP (XVECEXP (pat, diff_vec_p, i), 0))--;
|
LABEL_NUSES (XEXP (XVECEXP (pat, diff_vec_p, i), 0))--;
|
|
|
delete_insn_and_edges (next);
|
delete_insn_and_edges (next);
|
ndead++;
|
ndead++;
|
}
|
}
|
}
|
}
|
|
|
delete_insn_and_edges (insn);
|
delete_insn_and_edges (insn);
|
ndead++;
|
ndead++;
|
}
|
}
|
|
|
/* Delete dead libcalls for propagate_block. Return the insn
|
/* Delete dead libcalls for propagate_block. Return the insn
|
before the libcall. */
|
before the libcall. */
|
|
|
static rtx
|
static rtx
|
propagate_block_delete_libcall (rtx insn, rtx note)
|
propagate_block_delete_libcall (rtx insn, rtx note)
|
{
|
{
|
rtx first = XEXP (note, 0);
|
rtx first = XEXP (note, 0);
|
rtx before = PREV_INSN (first);
|
rtx before = PREV_INSN (first);
|
|
|
delete_insn_chain_and_edges (first, insn);
|
delete_insn_chain_and_edges (first, insn);
|
ndead++;
|
ndead++;
|
return before;
|
return before;
|
}
|
}
|
|
|
/* Update the life-status of regs for one insn. Return the previous insn. */
|
/* Update the life-status of regs for one insn. Return the previous insn. */
|
|
|
rtx
|
rtx
|
propagate_one_insn (struct propagate_block_info *pbi, rtx insn)
|
propagate_one_insn (struct propagate_block_info *pbi, rtx insn)
|
{
|
{
|
rtx prev = PREV_INSN (insn);
|
rtx prev = PREV_INSN (insn);
|
int flags = pbi->flags;
|
int flags = pbi->flags;
|
int insn_is_dead = 0;
|
int insn_is_dead = 0;
|
int libcall_is_dead = 0;
|
int libcall_is_dead = 0;
|
rtx note;
|
rtx note;
|
unsigned i;
|
unsigned i;
|
|
|
if (! INSN_P (insn))
|
if (! INSN_P (insn))
|
return prev;
|
return prev;
|
|
|
note = find_reg_note (insn, REG_RETVAL, NULL_RTX);
|
note = find_reg_note (insn, REG_RETVAL, NULL_RTX);
|
if (flags & PROP_SCAN_DEAD_CODE)
|
if (flags & PROP_SCAN_DEAD_CODE)
|
{
|
{
|
insn_is_dead = insn_dead_p (pbi, PATTERN (insn), 0, REG_NOTES (insn));
|
insn_is_dead = insn_dead_p (pbi, PATTERN (insn), 0, REG_NOTES (insn));
|
libcall_is_dead = (insn_is_dead && note != 0
|
libcall_is_dead = (insn_is_dead && note != 0
|
&& libcall_dead_p (pbi, note, insn));
|
&& libcall_dead_p (pbi, note, insn));
|
}
|
}
|
|
|
/* If an instruction consists of just dead store(s) on final pass,
|
/* If an instruction consists of just dead store(s) on final pass,
|
delete it. */
|
delete it. */
|
if ((flags & PROP_KILL_DEAD_CODE) && insn_is_dead)
|
if ((flags & PROP_KILL_DEAD_CODE) && insn_is_dead)
|
{
|
{
|
/* If we're trying to delete a prologue or epilogue instruction
|
/* If we're trying to delete a prologue or epilogue instruction
|
that isn't flagged as possibly being dead, something is wrong.
|
that isn't flagged as possibly being dead, something is wrong.
|
But if we are keeping the stack pointer depressed, we might well
|
But if we are keeping the stack pointer depressed, we might well
|
be deleting insns that are used to compute the amount to update
|
be deleting insns that are used to compute the amount to update
|
it by, so they are fine. */
|
it by, so they are fine. */
|
if (reload_completed
|
if (reload_completed
|
&& !(TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
|
&& !(TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
|
&& (TYPE_RETURNS_STACK_DEPRESSED
|
&& (TYPE_RETURNS_STACK_DEPRESSED
|
(TREE_TYPE (current_function_decl))))
|
(TREE_TYPE (current_function_decl))))
|
&& (((HAVE_epilogue || HAVE_prologue)
|
&& (((HAVE_epilogue || HAVE_prologue)
|
&& prologue_epilogue_contains (insn))
|
&& prologue_epilogue_contains (insn))
|
|| (HAVE_sibcall_epilogue
|
|| (HAVE_sibcall_epilogue
|
&& sibcall_epilogue_contains (insn)))
|
&& sibcall_epilogue_contains (insn)))
|
&& find_reg_note (insn, REG_MAYBE_DEAD, NULL_RTX) == 0)
|
&& find_reg_note (insn, REG_MAYBE_DEAD, NULL_RTX) == 0)
|
fatal_insn ("Attempt to delete prologue/epilogue insn:", insn);
|
fatal_insn ("Attempt to delete prologue/epilogue insn:", insn);
|
|
|
/* Record sets. Do this even for dead instructions, since they
|
/* Record sets. Do this even for dead instructions, since they
|
would have killed the values if they hadn't been deleted. To
|
would have killed the values if they hadn't been deleted. To
|
be consistent, we also have to emit a clobber when we delete
|
be consistent, we also have to emit a clobber when we delete
|
an insn that clobbers a live register. */
|
an insn that clobbers a live register. */
|
pbi->flags |= PROP_DEAD_INSN;
|
pbi->flags |= PROP_DEAD_INSN;
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
pbi->flags &= ~PROP_DEAD_INSN;
|
pbi->flags &= ~PROP_DEAD_INSN;
|
|
|
/* CC0 is now known to be dead. Either this insn used it,
|
/* CC0 is now known to be dead. Either this insn used it,
|
in which case it doesn't anymore, or clobbered it,
|
in which case it doesn't anymore, or clobbered it,
|
so the next insn can't use it. */
|
so the next insn can't use it. */
|
pbi->cc0_live = 0;
|
pbi->cc0_live = 0;
|
|
|
if (libcall_is_dead)
|
if (libcall_is_dead)
|
prev = propagate_block_delete_libcall (insn, note);
|
prev = propagate_block_delete_libcall (insn, note);
|
else
|
else
|
{
|
{
|
|
|
/* If INSN contains a RETVAL note and is dead, but the libcall
|
/* If INSN contains a RETVAL note and is dead, but the libcall
|
as a whole is not dead, then we want to remove INSN, but
|
as a whole is not dead, then we want to remove INSN, but
|
not the whole libcall sequence.
|
not the whole libcall sequence.
|
|
|
However, we need to also remove the dangling REG_LIBCALL
|
However, we need to also remove the dangling REG_LIBCALL
|
note so that we do not have mis-matched LIBCALL/RETVAL
|
note so that we do not have mis-matched LIBCALL/RETVAL
|
notes. In theory we could find a new location for the
|
notes. In theory we could find a new location for the
|
REG_RETVAL note, but it hardly seems worth the effort.
|
REG_RETVAL note, but it hardly seems worth the effort.
|
|
|
NOTE at this point will be the RETVAL note if it exists. */
|
NOTE at this point will be the RETVAL note if it exists. */
|
if (note)
|
if (note)
|
{
|
{
|
rtx libcall_note;
|
rtx libcall_note;
|
|
|
libcall_note
|
libcall_note
|
= find_reg_note (XEXP (note, 0), REG_LIBCALL, NULL_RTX);
|
= find_reg_note (XEXP (note, 0), REG_LIBCALL, NULL_RTX);
|
remove_note (XEXP (note, 0), libcall_note);
|
remove_note (XEXP (note, 0), libcall_note);
|
}
|
}
|
|
|
/* Similarly if INSN contains a LIBCALL note, remove the
|
/* Similarly if INSN contains a LIBCALL note, remove the
|
dangling REG_RETVAL note. */
|
dangling REG_RETVAL note. */
|
note = find_reg_note (insn, REG_LIBCALL, NULL_RTX);
|
note = find_reg_note (insn, REG_LIBCALL, NULL_RTX);
|
if (note)
|
if (note)
|
{
|
{
|
rtx retval_note;
|
rtx retval_note;
|
|
|
retval_note
|
retval_note
|
= find_reg_note (XEXP (note, 0), REG_RETVAL, NULL_RTX);
|
= find_reg_note (XEXP (note, 0), REG_RETVAL, NULL_RTX);
|
remove_note (XEXP (note, 0), retval_note);
|
remove_note (XEXP (note, 0), retval_note);
|
}
|
}
|
|
|
/* Now delete INSN. */
|
/* Now delete INSN. */
|
propagate_block_delete_insn (insn);
|
propagate_block_delete_insn (insn);
|
}
|
}
|
|
|
return prev;
|
return prev;
|
}
|
}
|
|
|
/* See if this is an increment or decrement that can be merged into
|
/* See if this is an increment or decrement that can be merged into
|
a following memory address. */
|
a following memory address. */
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
{
|
{
|
rtx x = single_set (insn);
|
rtx x = single_set (insn);
|
|
|
/* Does this instruction increment or decrement a register? */
|
/* Does this instruction increment or decrement a register? */
|
if ((flags & PROP_AUTOINC)
|
if ((flags & PROP_AUTOINC)
|
&& x != 0
|
&& x != 0
|
&& REG_P (SET_DEST (x))
|
&& REG_P (SET_DEST (x))
|
&& (GET_CODE (SET_SRC (x)) == PLUS
|
&& (GET_CODE (SET_SRC (x)) == PLUS
|
|| GET_CODE (SET_SRC (x)) == MINUS)
|
|| GET_CODE (SET_SRC (x)) == MINUS)
|
&& XEXP (SET_SRC (x), 0) == SET_DEST (x)
|
&& XEXP (SET_SRC (x), 0) == SET_DEST (x)
|
&& GET_CODE (XEXP (SET_SRC (x), 1)) == CONST_INT
|
&& GET_CODE (XEXP (SET_SRC (x), 1)) == CONST_INT
|
/* Ok, look for a following memory ref we can combine with.
|
/* Ok, look for a following memory ref we can combine with.
|
If one is found, change the memory ref to a PRE_INC
|
If one is found, change the memory ref to a PRE_INC
|
or PRE_DEC, cancel this insn, and return 1.
|
or PRE_DEC, cancel this insn, and return 1.
|
Return 0 if nothing has been done. */
|
Return 0 if nothing has been done. */
|
&& try_pre_increment_1 (pbi, insn))
|
&& try_pre_increment_1 (pbi, insn))
|
return prev;
|
return prev;
|
}
|
}
|
#endif /* AUTO_INC_DEC */
|
#endif /* AUTO_INC_DEC */
|
|
|
CLEAR_REG_SET (pbi->new_set);
|
CLEAR_REG_SET (pbi->new_set);
|
|
|
/* If this is not the final pass, and this insn is copying the value of
|
/* If this is not the final pass, and this insn is copying the value of
|
a library call and it's dead, don't scan the insns that perform the
|
a library call and it's dead, don't scan the insns that perform the
|
library call, so that the call's arguments are not marked live. */
|
library call, so that the call's arguments are not marked live. */
|
if (libcall_is_dead)
|
if (libcall_is_dead)
|
{
|
{
|
/* Record the death of the dest reg. */
|
/* Record the death of the dest reg. */
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
|
|
insn = XEXP (note, 0);
|
insn = XEXP (note, 0);
|
return PREV_INSN (insn);
|
return PREV_INSN (insn);
|
}
|
}
|
else if (GET_CODE (PATTERN (insn)) == SET
|
else if (GET_CODE (PATTERN (insn)) == SET
|
&& SET_DEST (PATTERN (insn)) == stack_pointer_rtx
|
&& SET_DEST (PATTERN (insn)) == stack_pointer_rtx
|
&& GET_CODE (SET_SRC (PATTERN (insn))) == PLUS
|
&& GET_CODE (SET_SRC (PATTERN (insn))) == PLUS
|
&& XEXP (SET_SRC (PATTERN (insn)), 0) == stack_pointer_rtx
|
&& XEXP (SET_SRC (PATTERN (insn)), 0) == stack_pointer_rtx
|
&& GET_CODE (XEXP (SET_SRC (PATTERN (insn)), 1)) == CONST_INT)
|
&& GET_CODE (XEXP (SET_SRC (PATTERN (insn)), 1)) == CONST_INT)
|
{
|
{
|
/* We have an insn to pop a constant amount off the stack.
|
/* We have an insn to pop a constant amount off the stack.
|
(Such insns use PLUS regardless of the direction of the stack,
|
(Such insns use PLUS regardless of the direction of the stack,
|
and any insn to adjust the stack by a constant is always a pop
|
and any insn to adjust the stack by a constant is always a pop
|
or part of a push.)
|
or part of a push.)
|
These insns, if not dead stores, have no effect on life, though
|
These insns, if not dead stores, have no effect on life, though
|
they do have an effect on the memory stores we are tracking. */
|
they do have an effect on the memory stores we are tracking. */
|
invalidate_mems_from_set (pbi, stack_pointer_rtx);
|
invalidate_mems_from_set (pbi, stack_pointer_rtx);
|
/* Still, we need to update local_set, lest ifcvt.c:dead_or_predicable
|
/* Still, we need to update local_set, lest ifcvt.c:dead_or_predicable
|
concludes that the stack pointer is not modified. */
|
concludes that the stack pointer is not modified. */
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Any regs live at the time of a call instruction must not go
|
/* Any regs live at the time of a call instruction must not go
|
in a register clobbered by calls. Find all regs now live and
|
in a register clobbered by calls. Find all regs now live and
|
record this for them. */
|
record this for them. */
|
|
|
if (CALL_P (insn) && (flags & PROP_REG_INFO))
|
if (CALL_P (insn) && (flags & PROP_REG_INFO))
|
{
|
{
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
EXECUTE_IF_SET_IN_REG_SET (pbi->reg_live, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (pbi->reg_live, 0, i, rsi)
|
REG_N_CALLS_CROSSED (i)++;
|
REG_N_CALLS_CROSSED (i)++;
|
if (can_throw_internal (insn))
|
if (can_throw_internal (insn))
|
EXECUTE_IF_SET_IN_REG_SET (pbi->reg_live, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (pbi->reg_live, 0, i, rsi)
|
REG_N_THROWING_CALLS_CROSSED (i)++;
|
REG_N_THROWING_CALLS_CROSSED (i)++;
|
}
|
}
|
|
|
/* Record sets. Do this even for dead instructions, since they
|
/* Record sets. Do this even for dead instructions, since they
|
would have killed the values if they hadn't been deleted. */
|
would have killed the values if they hadn't been deleted. */
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
mark_set_regs (pbi, PATTERN (insn), insn);
|
|
|
if (CALL_P (insn))
|
if (CALL_P (insn))
|
{
|
{
|
regset live_at_end;
|
regset live_at_end;
|
bool sibcall_p;
|
bool sibcall_p;
|
rtx note, cond;
|
rtx note, cond;
|
int i;
|
int i;
|
|
|
cond = NULL_RTX;
|
cond = NULL_RTX;
|
if (GET_CODE (PATTERN (insn)) == COND_EXEC)
|
if (GET_CODE (PATTERN (insn)) == COND_EXEC)
|
cond = COND_EXEC_TEST (PATTERN (insn));
|
cond = COND_EXEC_TEST (PATTERN (insn));
|
|
|
/* Non-constant calls clobber memory, constant calls do not
|
/* Non-constant calls clobber memory, constant calls do not
|
clobber memory, though they may clobber outgoing arguments
|
clobber memory, though they may clobber outgoing arguments
|
on the stack. */
|
on the stack. */
|
if (! CONST_OR_PURE_CALL_P (insn))
|
if (! CONST_OR_PURE_CALL_P (insn))
|
{
|
{
|
free_EXPR_LIST_list (&pbi->mem_set_list);
|
free_EXPR_LIST_list (&pbi->mem_set_list);
|
pbi->mem_set_list_len = 0;
|
pbi->mem_set_list_len = 0;
|
}
|
}
|
else
|
else
|
invalidate_mems_from_set (pbi, stack_pointer_rtx);
|
invalidate_mems_from_set (pbi, stack_pointer_rtx);
|
|
|
/* There may be extra registers to be clobbered. */
|
/* There may be extra registers to be clobbered. */
|
for (note = CALL_INSN_FUNCTION_USAGE (insn);
|
for (note = CALL_INSN_FUNCTION_USAGE (insn);
|
note;
|
note;
|
note = XEXP (note, 1))
|
note = XEXP (note, 1))
|
if (GET_CODE (XEXP (note, 0)) == CLOBBER)
|
if (GET_CODE (XEXP (note, 0)) == CLOBBER)
|
mark_set_1 (pbi, CLOBBER, XEXP (XEXP (note, 0), 0),
|
mark_set_1 (pbi, CLOBBER, XEXP (XEXP (note, 0), 0),
|
cond, insn, pbi->flags);
|
cond, insn, pbi->flags);
|
|
|
/* Calls change all call-used and global registers; sibcalls do not
|
/* Calls change all call-used and global registers; sibcalls do not
|
clobber anything that must be preserved at end-of-function,
|
clobber anything that must be preserved at end-of-function,
|
except for return values. */
|
except for return values. */
|
|
|
sibcall_p = SIBLING_CALL_P (insn);
|
sibcall_p = SIBLING_CALL_P (insn);
|
live_at_end = EXIT_BLOCK_PTR->il.rtl->global_live_at_start;
|
live_at_end = EXIT_BLOCK_PTR->il.rtl->global_live_at_start;
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i)
|
if (TEST_HARD_REG_BIT (regs_invalidated_by_call, i)
|
&& ! (sibcall_p
|
&& ! (sibcall_p
|
&& REGNO_REG_SET_P (live_at_end, i)
|
&& REGNO_REG_SET_P (live_at_end, i)
|
&& ! refers_to_regno_p (i, i+1,
|
&& ! refers_to_regno_p (i, i+1,
|
current_function_return_rtx,
|
current_function_return_rtx,
|
(rtx *) 0)))
|
(rtx *) 0)))
|
{
|
{
|
enum rtx_code code = global_regs[i] ? SET : CLOBBER;
|
enum rtx_code code = global_regs[i] ? SET : CLOBBER;
|
/* We do not want REG_UNUSED notes for these registers. */
|
/* We do not want REG_UNUSED notes for these registers. */
|
mark_set_1 (pbi, code, regno_reg_rtx[i], cond, insn,
|
mark_set_1 (pbi, code, regno_reg_rtx[i], cond, insn,
|
pbi->flags & ~(PROP_DEATH_NOTES | PROP_REG_INFO));
|
pbi->flags & ~(PROP_DEATH_NOTES | PROP_REG_INFO));
|
}
|
}
|
}
|
}
|
|
|
/* If an insn doesn't use CC0, it becomes dead since we assume
|
/* If an insn doesn't use CC0, it becomes dead since we assume
|
that every insn clobbers it. So show it dead here;
|
that every insn clobbers it. So show it dead here;
|
mark_used_regs will set it live if it is referenced. */
|
mark_used_regs will set it live if it is referenced. */
|
pbi->cc0_live = 0;
|
pbi->cc0_live = 0;
|
|
|
/* Record uses. */
|
/* Record uses. */
|
if (! insn_is_dead)
|
if (! insn_is_dead)
|
mark_used_regs (pbi, PATTERN (insn), NULL_RTX, insn);
|
mark_used_regs (pbi, PATTERN (insn), NULL_RTX, insn);
|
|
|
/* Sometimes we may have inserted something before INSN (such as a move)
|
/* Sometimes we may have inserted something before INSN (such as a move)
|
when we make an auto-inc. So ensure we will scan those insns. */
|
when we make an auto-inc. So ensure we will scan those insns. */
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
prev = PREV_INSN (insn);
|
prev = PREV_INSN (insn);
|
#endif
|
#endif
|
|
|
if (! insn_is_dead && CALL_P (insn))
|
if (! insn_is_dead && CALL_P (insn))
|
{
|
{
|
int i;
|
int i;
|
rtx note, cond;
|
rtx note, cond;
|
|
|
cond = NULL_RTX;
|
cond = NULL_RTX;
|
if (GET_CODE (PATTERN (insn)) == COND_EXEC)
|
if (GET_CODE (PATTERN (insn)) == COND_EXEC)
|
cond = COND_EXEC_TEST (PATTERN (insn));
|
cond = COND_EXEC_TEST (PATTERN (insn));
|
|
|
/* Calls use their arguments, and may clobber memory which
|
/* Calls use their arguments, and may clobber memory which
|
address involves some register. */
|
address involves some register. */
|
for (note = CALL_INSN_FUNCTION_USAGE (insn);
|
for (note = CALL_INSN_FUNCTION_USAGE (insn);
|
note;
|
note;
|
note = XEXP (note, 1))
|
note = XEXP (note, 1))
|
/* We find USE or CLOBBER entities in a FUNCTION_USAGE list: both
|
/* We find USE or CLOBBER entities in a FUNCTION_USAGE list: both
|
of which mark_used_regs knows how to handle. */
|
of which mark_used_regs knows how to handle. */
|
mark_used_regs (pbi, XEXP (XEXP (note, 0), 0), cond, insn);
|
mark_used_regs (pbi, XEXP (XEXP (note, 0), 0), cond, insn);
|
|
|
/* The stack ptr is used (honorarily) by a CALL insn. */
|
/* The stack ptr is used (honorarily) by a CALL insn. */
|
if ((flags & PROP_REG_INFO)
|
if ((flags & PROP_REG_INFO)
|
&& !REGNO_REG_SET_P (pbi->reg_live, STACK_POINTER_REGNUM))
|
&& !REGNO_REG_SET_P (pbi->reg_live, STACK_POINTER_REGNUM))
|
reg_deaths[STACK_POINTER_REGNUM] = pbi->insn_num;
|
reg_deaths[STACK_POINTER_REGNUM] = pbi->insn_num;
|
SET_REGNO_REG_SET (pbi->reg_live, STACK_POINTER_REGNUM);
|
SET_REGNO_REG_SET (pbi->reg_live, STACK_POINTER_REGNUM);
|
|
|
/* Calls may also reference any of the global registers,
|
/* Calls may also reference any of the global registers,
|
so they are made live. */
|
so they are made live. */
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (global_regs[i])
|
if (global_regs[i])
|
mark_used_reg (pbi, regno_reg_rtx[i], cond, insn);
|
mark_used_reg (pbi, regno_reg_rtx[i], cond, insn);
|
}
|
}
|
}
|
}
|
|
|
pbi->insn_num++;
|
pbi->insn_num++;
|
|
|
return prev;
|
return prev;
|
}
|
}
|
|
|
/* Initialize a propagate_block_info struct for public consumption.
|
/* Initialize a propagate_block_info struct for public consumption.
|
Note that the structure itself is opaque to this file, but that
|
Note that the structure itself is opaque to this file, but that
|
the user can use the regsets provided here. */
|
the user can use the regsets provided here. */
|
|
|
struct propagate_block_info *
|
struct propagate_block_info *
|
init_propagate_block_info (basic_block bb, regset live, regset local_set,
|
init_propagate_block_info (basic_block bb, regset live, regset local_set,
|
regset cond_local_set, int flags)
|
regset cond_local_set, int flags)
|
{
|
{
|
struct propagate_block_info *pbi = XNEW (struct propagate_block_info);
|
struct propagate_block_info *pbi = XNEW (struct propagate_block_info);
|
|
|
pbi->bb = bb;
|
pbi->bb = bb;
|
pbi->reg_live = live;
|
pbi->reg_live = live;
|
pbi->mem_set_list = NULL_RTX;
|
pbi->mem_set_list = NULL_RTX;
|
pbi->mem_set_list_len = 0;
|
pbi->mem_set_list_len = 0;
|
pbi->local_set = local_set;
|
pbi->local_set = local_set;
|
pbi->cond_local_set = cond_local_set;
|
pbi->cond_local_set = cond_local_set;
|
pbi->cc0_live = 0;
|
pbi->cc0_live = 0;
|
pbi->flags = flags;
|
pbi->flags = flags;
|
pbi->insn_num = 0;
|
pbi->insn_num = 0;
|
|
|
if (flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
if (flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
pbi->reg_next_use = XCNEWVEC (rtx, max_reg_num ());
|
pbi->reg_next_use = XCNEWVEC (rtx, max_reg_num ());
|
else
|
else
|
pbi->reg_next_use = NULL;
|
pbi->reg_next_use = NULL;
|
|
|
pbi->new_set = BITMAP_ALLOC (NULL);
|
pbi->new_set = BITMAP_ALLOC (NULL);
|
|
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
pbi->reg_cond_dead = splay_tree_new (splay_tree_compare_ints, NULL,
|
pbi->reg_cond_dead = splay_tree_new (splay_tree_compare_ints, NULL,
|
free_reg_cond_life_info);
|
free_reg_cond_life_info);
|
pbi->reg_cond_reg = BITMAP_ALLOC (NULL);
|
pbi->reg_cond_reg = BITMAP_ALLOC (NULL);
|
|
|
/* If this block ends in a conditional branch, for each register
|
/* If this block ends in a conditional branch, for each register
|
live from one side of the branch and not the other, record the
|
live from one side of the branch and not the other, record the
|
register as conditionally dead. */
|
register as conditionally dead. */
|
if (JUMP_P (BB_END (bb))
|
if (JUMP_P (BB_END (bb))
|
&& any_condjump_p (BB_END (bb)))
|
&& any_condjump_p (BB_END (bb)))
|
{
|
{
|
regset diff = ALLOC_REG_SET (®_obstack);
|
regset diff = ALLOC_REG_SET (®_obstack);
|
basic_block bb_true, bb_false;
|
basic_block bb_true, bb_false;
|
unsigned i;
|
unsigned i;
|
|
|
/* Identify the successor blocks. */
|
/* Identify the successor blocks. */
|
bb_true = EDGE_SUCC (bb, 0)->dest;
|
bb_true = EDGE_SUCC (bb, 0)->dest;
|
if (!single_succ_p (bb))
|
if (!single_succ_p (bb))
|
{
|
{
|
bb_false = EDGE_SUCC (bb, 1)->dest;
|
bb_false = EDGE_SUCC (bb, 1)->dest;
|
|
|
if (EDGE_SUCC (bb, 0)->flags & EDGE_FALLTHRU)
|
if (EDGE_SUCC (bb, 0)->flags & EDGE_FALLTHRU)
|
{
|
{
|
basic_block t = bb_false;
|
basic_block t = bb_false;
|
bb_false = bb_true;
|
bb_false = bb_true;
|
bb_true = t;
|
bb_true = t;
|
}
|
}
|
else
|
else
|
gcc_assert (EDGE_SUCC (bb, 1)->flags & EDGE_FALLTHRU);
|
gcc_assert (EDGE_SUCC (bb, 1)->flags & EDGE_FALLTHRU);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* This can happen with a conditional jump to the next insn. */
|
/* This can happen with a conditional jump to the next insn. */
|
gcc_assert (JUMP_LABEL (BB_END (bb)) == BB_HEAD (bb_true));
|
gcc_assert (JUMP_LABEL (BB_END (bb)) == BB_HEAD (bb_true));
|
|
|
/* Simplest way to do nothing. */
|
/* Simplest way to do nothing. */
|
bb_false = bb_true;
|
bb_false = bb_true;
|
}
|
}
|
|
|
/* Compute which register lead different lives in the successors. */
|
/* Compute which register lead different lives in the successors. */
|
bitmap_xor (diff, bb_true->il.rtl->global_live_at_start,
|
bitmap_xor (diff, bb_true->il.rtl->global_live_at_start,
|
bb_false->il.rtl->global_live_at_start);
|
bb_false->il.rtl->global_live_at_start);
|
|
|
if (!bitmap_empty_p (diff))
|
if (!bitmap_empty_p (diff))
|
{
|
{
|
/* Extract the condition from the branch. */
|
/* Extract the condition from the branch. */
|
rtx set_src = SET_SRC (pc_set (BB_END (bb)));
|
rtx set_src = SET_SRC (pc_set (BB_END (bb)));
|
rtx cond_true = XEXP (set_src, 0);
|
rtx cond_true = XEXP (set_src, 0);
|
rtx reg = XEXP (cond_true, 0);
|
rtx reg = XEXP (cond_true, 0);
|
enum rtx_code inv_cond;
|
enum rtx_code inv_cond;
|
|
|
if (GET_CODE (reg) == SUBREG)
|
if (GET_CODE (reg) == SUBREG)
|
reg = SUBREG_REG (reg);
|
reg = SUBREG_REG (reg);
|
|
|
/* We can only track conditional lifetimes if the condition is
|
/* We can only track conditional lifetimes if the condition is
|
in the form of a reversible comparison of a register against
|
in the form of a reversible comparison of a register against
|
zero. If the condition is more complex than that, then it is
|
zero. If the condition is more complex than that, then it is
|
safe not to record any information. */
|
safe not to record any information. */
|
inv_cond = reversed_comparison_code (cond_true, BB_END (bb));
|
inv_cond = reversed_comparison_code (cond_true, BB_END (bb));
|
if (inv_cond != UNKNOWN
|
if (inv_cond != UNKNOWN
|
&& REG_P (reg)
|
&& REG_P (reg)
|
&& XEXP (cond_true, 1) == const0_rtx)
|
&& XEXP (cond_true, 1) == const0_rtx)
|
{
|
{
|
rtx cond_false
|
rtx cond_false
|
= gen_rtx_fmt_ee (inv_cond,
|
= gen_rtx_fmt_ee (inv_cond,
|
GET_MODE (cond_true), XEXP (cond_true, 0),
|
GET_MODE (cond_true), XEXP (cond_true, 0),
|
XEXP (cond_true, 1));
|
XEXP (cond_true, 1));
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
if (GET_CODE (XEXP (set_src, 1)) == PC)
|
if (GET_CODE (XEXP (set_src, 1)) == PC)
|
{
|
{
|
rtx t = cond_false;
|
rtx t = cond_false;
|
cond_false = cond_true;
|
cond_false = cond_true;
|
cond_true = t;
|
cond_true = t;
|
}
|
}
|
|
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (reg));
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (reg));
|
|
|
/* For each such register, mark it conditionally dead. */
|
/* For each such register, mark it conditionally dead. */
|
EXECUTE_IF_SET_IN_REG_SET (diff, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (diff, 0, i, rsi)
|
{
|
{
|
struct reg_cond_life_info *rcli;
|
struct reg_cond_life_info *rcli;
|
rtx cond;
|
rtx cond;
|
|
|
rcli = XNEW (struct reg_cond_life_info);
|
rcli = XNEW (struct reg_cond_life_info);
|
|
|
if (REGNO_REG_SET_P (bb_true->il.rtl->global_live_at_start,
|
if (REGNO_REG_SET_P (bb_true->il.rtl->global_live_at_start,
|
i))
|
i))
|
cond = cond_false;
|
cond = cond_false;
|
else
|
else
|
cond = cond_true;
|
cond = cond_true;
|
rcli->condition = cond;
|
rcli->condition = cond;
|
rcli->stores = const0_rtx;
|
rcli->stores = const0_rtx;
|
rcli->orig_condition = cond;
|
rcli->orig_condition = cond;
|
|
|
splay_tree_insert (pbi->reg_cond_dead, i,
|
splay_tree_insert (pbi->reg_cond_dead, i,
|
(splay_tree_value) rcli);
|
(splay_tree_value) rcli);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
FREE_REG_SET (diff);
|
FREE_REG_SET (diff);
|
}
|
}
|
#endif
|
#endif
|
|
|
/* If this block has no successors, any stores to the frame that aren't
|
/* If this block has no successors, any stores to the frame that aren't
|
used later in the block are dead. So make a pass over the block
|
used later in the block are dead. So make a pass over the block
|
recording any such that are made and show them dead at the end. We do
|
recording any such that are made and show them dead at the end. We do
|
a very conservative and simple job here. */
|
a very conservative and simple job here. */
|
if (optimize
|
if (optimize
|
&& ! (TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
|
&& ! (TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
|
&& (TYPE_RETURNS_STACK_DEPRESSED
|
&& (TYPE_RETURNS_STACK_DEPRESSED
|
(TREE_TYPE (current_function_decl))))
|
(TREE_TYPE (current_function_decl))))
|
&& (flags & PROP_SCAN_DEAD_STORES)
|
&& (flags & PROP_SCAN_DEAD_STORES)
|
&& (EDGE_COUNT (bb->succs) == 0
|
&& (EDGE_COUNT (bb->succs) == 0
|
|| (single_succ_p (bb)
|
|| (single_succ_p (bb)
|
&& single_succ (bb) == EXIT_BLOCK_PTR
|
&& single_succ (bb) == EXIT_BLOCK_PTR
|
&& ! current_function_calls_eh_return)))
|
&& ! current_function_calls_eh_return)))
|
{
|
{
|
rtx insn, set;
|
rtx insn, set;
|
for (insn = BB_END (bb); insn != BB_HEAD (bb); insn = PREV_INSN (insn))
|
for (insn = BB_END (bb); insn != BB_HEAD (bb); insn = PREV_INSN (insn))
|
if (NONJUMP_INSN_P (insn)
|
if (NONJUMP_INSN_P (insn)
|
&& (set = single_set (insn))
|
&& (set = single_set (insn))
|
&& MEM_P (SET_DEST (set)))
|
&& MEM_P (SET_DEST (set)))
|
{
|
{
|
rtx mem = SET_DEST (set);
|
rtx mem = SET_DEST (set);
|
rtx canon_mem = canon_rtx (mem);
|
rtx canon_mem = canon_rtx (mem);
|
|
|
if (XEXP (canon_mem, 0) == frame_pointer_rtx
|
if (XEXP (canon_mem, 0) == frame_pointer_rtx
|
|| (GET_CODE (XEXP (canon_mem, 0)) == PLUS
|
|| (GET_CODE (XEXP (canon_mem, 0)) == PLUS
|
&& XEXP (XEXP (canon_mem, 0), 0) == frame_pointer_rtx
|
&& XEXP (XEXP (canon_mem, 0), 0) == frame_pointer_rtx
|
&& GET_CODE (XEXP (XEXP (canon_mem, 0), 1)) == CONST_INT))
|
&& GET_CODE (XEXP (XEXP (canon_mem, 0), 1)) == CONST_INT))
|
add_to_mem_set_list (pbi, canon_mem);
|
add_to_mem_set_list (pbi, canon_mem);
|
}
|
}
|
}
|
}
|
|
|
return pbi;
|
return pbi;
|
}
|
}
|
|
|
/* Release a propagate_block_info struct. */
|
/* Release a propagate_block_info struct. */
|
|
|
void
|
void
|
free_propagate_block_info (struct propagate_block_info *pbi)
|
free_propagate_block_info (struct propagate_block_info *pbi)
|
{
|
{
|
free_EXPR_LIST_list (&pbi->mem_set_list);
|
free_EXPR_LIST_list (&pbi->mem_set_list);
|
|
|
BITMAP_FREE (pbi->new_set);
|
BITMAP_FREE (pbi->new_set);
|
|
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
splay_tree_delete (pbi->reg_cond_dead);
|
splay_tree_delete (pbi->reg_cond_dead);
|
BITMAP_FREE (pbi->reg_cond_reg);
|
BITMAP_FREE (pbi->reg_cond_reg);
|
#endif
|
#endif
|
|
|
if (pbi->flags & PROP_REG_INFO)
|
if (pbi->flags & PROP_REG_INFO)
|
{
|
{
|
int num = pbi->insn_num;
|
int num = pbi->insn_num;
|
unsigned i;
|
unsigned i;
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
EXECUTE_IF_SET_IN_REG_SET (pbi->reg_live, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (pbi->reg_live, 0, i, rsi)
|
{
|
{
|
REG_LIVE_LENGTH (i) += num - reg_deaths[i];
|
REG_LIVE_LENGTH (i) += num - reg_deaths[i];
|
reg_deaths[i] = 0;
|
reg_deaths[i] = 0;
|
}
|
}
|
}
|
}
|
if (pbi->reg_next_use)
|
if (pbi->reg_next_use)
|
free (pbi->reg_next_use);
|
free (pbi->reg_next_use);
|
|
|
free (pbi);
|
free (pbi);
|
}
|
}
|
|
|
/* Compute the registers live at the beginning of a basic block BB from
|
/* Compute the registers live at the beginning of a basic block BB from
|
those live at the end.
|
those live at the end.
|
|
|
When called, REG_LIVE contains those live at the end. On return, it
|
When called, REG_LIVE contains those live at the end. On return, it
|
contains those live at the beginning.
|
contains those live at the beginning.
|
|
|
LOCAL_SET, if non-null, will be set with all registers killed
|
LOCAL_SET, if non-null, will be set with all registers killed
|
unconditionally by this basic block.
|
unconditionally by this basic block.
|
Likewise, COND_LOCAL_SET, if non-null, will be set with all registers
|
Likewise, COND_LOCAL_SET, if non-null, will be set with all registers
|
killed conditionally by this basic block. If there is any unconditional
|
killed conditionally by this basic block. If there is any unconditional
|
set of a register, then the corresponding bit will be set in LOCAL_SET
|
set of a register, then the corresponding bit will be set in LOCAL_SET
|
and cleared in COND_LOCAL_SET.
|
and cleared in COND_LOCAL_SET.
|
It is valid for LOCAL_SET and COND_LOCAL_SET to be the same set. In this
|
It is valid for LOCAL_SET and COND_LOCAL_SET to be the same set. In this
|
case, the resulting set will be equal to the union of the two sets that
|
case, the resulting set will be equal to the union of the two sets that
|
would otherwise be computed.
|
would otherwise be computed.
|
|
|
Return nonzero if an INSN is deleted (i.e. by dead code removal). */
|
Return nonzero if an INSN is deleted (i.e. by dead code removal). */
|
|
|
int
|
int
|
propagate_block (basic_block bb, regset live, regset local_set,
|
propagate_block (basic_block bb, regset live, regset local_set,
|
regset cond_local_set, int flags)
|
regset cond_local_set, int flags)
|
{
|
{
|
struct propagate_block_info *pbi;
|
struct propagate_block_info *pbi;
|
rtx insn, prev;
|
rtx insn, prev;
|
int changed;
|
int changed;
|
|
|
pbi = init_propagate_block_info (bb, live, local_set, cond_local_set, flags);
|
pbi = init_propagate_block_info (bb, live, local_set, cond_local_set, flags);
|
|
|
if (flags & PROP_REG_INFO)
|
if (flags & PROP_REG_INFO)
|
{
|
{
|
unsigned i;
|
unsigned i;
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
/* Process the regs live at the end of the block.
|
/* Process the regs live at the end of the block.
|
Mark them as not local to any one basic block. */
|
Mark them as not local to any one basic block. */
|
EXECUTE_IF_SET_IN_REG_SET (live, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (live, 0, i, rsi)
|
REG_BASIC_BLOCK (i) = REG_BLOCK_GLOBAL;
|
REG_BASIC_BLOCK (i) = REG_BLOCK_GLOBAL;
|
}
|
}
|
|
|
/* Scan the block an insn at a time from end to beginning. */
|
/* Scan the block an insn at a time from end to beginning. */
|
|
|
changed = 0;
|
changed = 0;
|
for (insn = BB_END (bb); ; insn = prev)
|
for (insn = BB_END (bb); ; insn = prev)
|
{
|
{
|
/* If this is a call to `setjmp' et al, warn if any
|
/* If this is a call to `setjmp' et al, warn if any
|
non-volatile datum is live. */
|
non-volatile datum is live. */
|
if ((flags & PROP_REG_INFO)
|
if ((flags & PROP_REG_INFO)
|
&& CALL_P (insn)
|
&& CALL_P (insn)
|
&& find_reg_note (insn, REG_SETJMP, NULL))
|
&& find_reg_note (insn, REG_SETJMP, NULL))
|
IOR_REG_SET (regs_live_at_setjmp, pbi->reg_live);
|
IOR_REG_SET (regs_live_at_setjmp, pbi->reg_live);
|
|
|
prev = propagate_one_insn (pbi, insn);
|
prev = propagate_one_insn (pbi, insn);
|
if (!prev)
|
if (!prev)
|
changed |= insn != get_insns ();
|
changed |= insn != get_insns ();
|
else
|
else
|
changed |= NEXT_INSN (prev) != insn;
|
changed |= NEXT_INSN (prev) != insn;
|
|
|
if (insn == BB_HEAD (bb))
|
if (insn == BB_HEAD (bb))
|
break;
|
break;
|
}
|
}
|
|
|
#ifdef EH_RETURN_DATA_REGNO
|
#ifdef EH_RETURN_DATA_REGNO
|
if (bb_has_eh_pred (bb))
|
if (bb_has_eh_pred (bb))
|
{
|
{
|
unsigned int i;
|
unsigned int i;
|
for (i = 0; ; ++i)
|
for (i = 0; ; ++i)
|
{
|
{
|
unsigned regno = EH_RETURN_DATA_REGNO (i);
|
unsigned regno = EH_RETURN_DATA_REGNO (i);
|
if (regno == INVALID_REGNUM)
|
if (regno == INVALID_REGNUM)
|
break;
|
break;
|
if (pbi->local_set)
|
if (pbi->local_set)
|
{
|
{
|
CLEAR_REGNO_REG_SET (pbi->cond_local_set, regno);
|
CLEAR_REGNO_REG_SET (pbi->cond_local_set, regno);
|
SET_REGNO_REG_SET (pbi->local_set, regno);
|
SET_REGNO_REG_SET (pbi->local_set, regno);
|
}
|
}
|
if (REGNO_REG_SET_P (pbi->reg_live, regno))
|
if (REGNO_REG_SET_P (pbi->reg_live, regno))
|
SET_REGNO_REG_SET (pbi->new_set, regno);
|
SET_REGNO_REG_SET (pbi->new_set, regno);
|
|
|
regs_ever_live[regno] = 1;
|
regs_ever_live[regno] = 1;
|
}
|
}
|
}
|
}
|
#endif
|
#endif
|
|
|
free_propagate_block_info (pbi);
|
free_propagate_block_info (pbi);
|
|
|
return changed;
|
return changed;
|
}
|
}
|
|
|
/* Return 1 if X (the body of an insn, or part of it) is just dead stores
|
/* Return 1 if X (the body of an insn, or part of it) is just dead stores
|
(SET expressions whose destinations are registers dead after the insn).
|
(SET expressions whose destinations are registers dead after the insn).
|
NEEDED is the regset that says which regs are alive after the insn.
|
NEEDED is the regset that says which regs are alive after the insn.
|
|
|
Unless CALL_OK is nonzero, an insn is needed if it contains a CALL.
|
Unless CALL_OK is nonzero, an insn is needed if it contains a CALL.
|
|
|
If X is the entire body of an insn, NOTES contains the reg notes
|
If X is the entire body of an insn, NOTES contains the reg notes
|
pertaining to the insn. */
|
pertaining to the insn. */
|
|
|
static int
|
static int
|
insn_dead_p (struct propagate_block_info *pbi, rtx x, int call_ok,
|
insn_dead_p (struct propagate_block_info *pbi, rtx x, int call_ok,
|
rtx notes ATTRIBUTE_UNUSED)
|
rtx notes ATTRIBUTE_UNUSED)
|
{
|
{
|
enum rtx_code code = GET_CODE (x);
|
enum rtx_code code = GET_CODE (x);
|
|
|
/* Don't eliminate insns that may trap. */
|
/* Don't eliminate insns that may trap. */
|
if (flag_non_call_exceptions && may_trap_p (x))
|
if (flag_non_call_exceptions && may_trap_p (x))
|
return 0;
|
return 0;
|
|
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
/* As flow is invoked after combine, we must take existing AUTO_INC
|
/* As flow is invoked after combine, we must take existing AUTO_INC
|
expressions into account. */
|
expressions into account. */
|
for (; notes; notes = XEXP (notes, 1))
|
for (; notes; notes = XEXP (notes, 1))
|
{
|
{
|
if (REG_NOTE_KIND (notes) == REG_INC)
|
if (REG_NOTE_KIND (notes) == REG_INC)
|
{
|
{
|
int regno = REGNO (XEXP (notes, 0));
|
int regno = REGNO (XEXP (notes, 0));
|
|
|
/* Don't delete insns to set global regs. */
|
/* Don't delete insns to set global regs. */
|
if ((regno < FIRST_PSEUDO_REGISTER && global_regs[regno])
|
if ((regno < FIRST_PSEUDO_REGISTER && global_regs[regno])
|
|| REGNO_REG_SET_P (pbi->reg_live, regno))
|
|| REGNO_REG_SET_P (pbi->reg_live, regno))
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
#endif
|
#endif
|
|
|
/* If setting something that's a reg or part of one,
|
/* If setting something that's a reg or part of one,
|
see if that register's altered value will be live. */
|
see if that register's altered value will be live. */
|
|
|
if (code == SET)
|
if (code == SET)
|
{
|
{
|
rtx r = SET_DEST (x);
|
rtx r = SET_DEST (x);
|
|
|
#ifdef HAVE_cc0
|
#ifdef HAVE_cc0
|
if (GET_CODE (r) == CC0)
|
if (GET_CODE (r) == CC0)
|
return ! pbi->cc0_live;
|
return ! pbi->cc0_live;
|
#endif
|
#endif
|
|
|
/* A SET that is a subroutine call cannot be dead. */
|
/* A SET that is a subroutine call cannot be dead. */
|
if (GET_CODE (SET_SRC (x)) == CALL)
|
if (GET_CODE (SET_SRC (x)) == CALL)
|
{
|
{
|
if (! call_ok)
|
if (! call_ok)
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Don't eliminate loads from volatile memory or volatile asms. */
|
/* Don't eliminate loads from volatile memory or volatile asms. */
|
else if (volatile_refs_p (SET_SRC (x)))
|
else if (volatile_refs_p (SET_SRC (x)))
|
return 0;
|
return 0;
|
|
|
if (MEM_P (r))
|
if (MEM_P (r))
|
{
|
{
|
rtx temp, canon_r;
|
rtx temp, canon_r;
|
|
|
if (MEM_VOLATILE_P (r) || GET_MODE (r) == BLKmode)
|
if (MEM_VOLATILE_P (r) || GET_MODE (r) == BLKmode)
|
return 0;
|
return 0;
|
|
|
canon_r = canon_rtx (r);
|
canon_r = canon_rtx (r);
|
|
|
/* Walk the set of memory locations we are currently tracking
|
/* Walk the set of memory locations we are currently tracking
|
and see if one is an identical match to this memory location.
|
and see if one is an identical match to this memory location.
|
If so, this memory write is dead (remember, we're walking
|
If so, this memory write is dead (remember, we're walking
|
backwards from the end of the block to the start). Since
|
backwards from the end of the block to the start). Since
|
rtx_equal_p does not check the alias set or flags, we also
|
rtx_equal_p does not check the alias set or flags, we also
|
must have the potential for them to conflict (anti_dependence). */
|
must have the potential for them to conflict (anti_dependence). */
|
for (temp = pbi->mem_set_list; temp != 0; temp = XEXP (temp, 1))
|
for (temp = pbi->mem_set_list; temp != 0; temp = XEXP (temp, 1))
|
if (anti_dependence (r, XEXP (temp, 0)))
|
if (anti_dependence (r, XEXP (temp, 0)))
|
{
|
{
|
rtx mem = XEXP (temp, 0);
|
rtx mem = XEXP (temp, 0);
|
|
|
if (rtx_equal_p (XEXP (canon_r, 0), XEXP (mem, 0))
|
if (rtx_equal_p (XEXP (canon_r, 0), XEXP (mem, 0))
|
&& (GET_MODE_SIZE (GET_MODE (canon_r))
|
&& (GET_MODE_SIZE (GET_MODE (canon_r))
|
<= GET_MODE_SIZE (GET_MODE (mem))))
|
<= GET_MODE_SIZE (GET_MODE (mem))))
|
return 1;
|
return 1;
|
|
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
/* Check if memory reference matches an auto increment. Only
|
/* Check if memory reference matches an auto increment. Only
|
post increment/decrement or modify are valid. */
|
post increment/decrement or modify are valid. */
|
if (GET_MODE (mem) == GET_MODE (r)
|
if (GET_MODE (mem) == GET_MODE (r)
|
&& (GET_CODE (XEXP (mem, 0)) == POST_DEC
|
&& (GET_CODE (XEXP (mem, 0)) == POST_DEC
|
|| GET_CODE (XEXP (mem, 0)) == POST_INC
|
|| GET_CODE (XEXP (mem, 0)) == POST_INC
|
|| GET_CODE (XEXP (mem, 0)) == POST_MODIFY)
|
|| GET_CODE (XEXP (mem, 0)) == POST_MODIFY)
|
&& GET_MODE (XEXP (mem, 0)) == GET_MODE (r)
|
&& GET_MODE (XEXP (mem, 0)) == GET_MODE (r)
|
&& rtx_equal_p (XEXP (XEXP (mem, 0), 0), XEXP (r, 0)))
|
&& rtx_equal_p (XEXP (XEXP (mem, 0), 0), XEXP (r, 0)))
|
return 1;
|
return 1;
|
#endif
|
#endif
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
while (GET_CODE (r) == SUBREG
|
while (GET_CODE (r) == SUBREG
|
|| GET_CODE (r) == STRICT_LOW_PART
|
|| GET_CODE (r) == STRICT_LOW_PART
|
|| GET_CODE (r) == ZERO_EXTRACT)
|
|| GET_CODE (r) == ZERO_EXTRACT)
|
r = XEXP (r, 0);
|
r = XEXP (r, 0);
|
|
|
if (REG_P (r))
|
if (REG_P (r))
|
{
|
{
|
int regno = REGNO (r);
|
int regno = REGNO (r);
|
|
|
/* Obvious. */
|
/* Obvious. */
|
if (REGNO_REG_SET_P (pbi->reg_live, regno))
|
if (REGNO_REG_SET_P (pbi->reg_live, regno))
|
return 0;
|
return 0;
|
|
|
/* If this is a hard register, verify that subsequent
|
/* If this is a hard register, verify that subsequent
|
words are not needed. */
|
words are not needed. */
|
if (regno < FIRST_PSEUDO_REGISTER)
|
if (regno < FIRST_PSEUDO_REGISTER)
|
{
|
{
|
int n = hard_regno_nregs[regno][GET_MODE (r)];
|
int n = hard_regno_nregs[regno][GET_MODE (r)];
|
|
|
while (--n > 0)
|
while (--n > 0)
|
if (REGNO_REG_SET_P (pbi->reg_live, regno+n))
|
if (REGNO_REG_SET_P (pbi->reg_live, regno+n))
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Don't delete insns to set global regs. */
|
/* Don't delete insns to set global regs. */
|
if (regno < FIRST_PSEUDO_REGISTER && global_regs[regno])
|
if (regno < FIRST_PSEUDO_REGISTER && global_regs[regno])
|
return 0;
|
return 0;
|
|
|
/* Make sure insns to set the stack pointer aren't deleted. */
|
/* Make sure insns to set the stack pointer aren't deleted. */
|
if (regno == STACK_POINTER_REGNUM)
|
if (regno == STACK_POINTER_REGNUM)
|
return 0;
|
return 0;
|
|
|
/* ??? These bits might be redundant with the force live bits
|
/* ??? These bits might be redundant with the force live bits
|
in calculate_global_regs_live. We would delete from
|
in calculate_global_regs_live. We would delete from
|
sequential sets; whether this actually affects real code
|
sequential sets; whether this actually affects real code
|
for anything but the stack pointer I don't know. */
|
for anything but the stack pointer I don't know. */
|
/* Make sure insns to set the frame pointer aren't deleted. */
|
/* Make sure insns to set the frame pointer aren't deleted. */
|
if (regno == FRAME_POINTER_REGNUM
|
if (regno == FRAME_POINTER_REGNUM
|
&& (! reload_completed || frame_pointer_needed))
|
&& (! reload_completed || frame_pointer_needed))
|
return 0;
|
return 0;
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
if (regno == HARD_FRAME_POINTER_REGNUM
|
if (regno == HARD_FRAME_POINTER_REGNUM
|
&& (! reload_completed || frame_pointer_needed))
|
&& (! reload_completed || frame_pointer_needed))
|
return 0;
|
return 0;
|
#endif
|
#endif
|
|
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
/* Make sure insns to set arg pointer are never deleted
|
/* Make sure insns to set arg pointer are never deleted
|
(if the arg pointer isn't fixed, there will be a USE
|
(if the arg pointer isn't fixed, there will be a USE
|
for it, so we can treat it normally). */
|
for it, so we can treat it normally). */
|
if (regno == ARG_POINTER_REGNUM && fixed_regs[regno])
|
if (regno == ARG_POINTER_REGNUM && fixed_regs[regno])
|
return 0;
|
return 0;
|
#endif
|
#endif
|
|
|
/* Otherwise, the set is dead. */
|
/* Otherwise, the set is dead. */
|
return 1;
|
return 1;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* If performing several activities, insn is dead if each activity
|
/* If performing several activities, insn is dead if each activity
|
is individually dead. Also, CLOBBERs and USEs can be ignored; a
|
is individually dead. Also, CLOBBERs and USEs can be ignored; a
|
CLOBBER or USE that's inside a PARALLEL doesn't make the insn
|
CLOBBER or USE that's inside a PARALLEL doesn't make the insn
|
worth keeping. */
|
worth keeping. */
|
else if (code == PARALLEL)
|
else if (code == PARALLEL)
|
{
|
{
|
int i = XVECLEN (x, 0);
|
int i = XVECLEN (x, 0);
|
|
|
for (i--; i >= 0; i--)
|
for (i--; i >= 0; i--)
|
if (GET_CODE (XVECEXP (x, 0, i)) != CLOBBER
|
if (GET_CODE (XVECEXP (x, 0, i)) != CLOBBER
|
&& GET_CODE (XVECEXP (x, 0, i)) != USE
|
&& GET_CODE (XVECEXP (x, 0, i)) != USE
|
&& ! insn_dead_p (pbi, XVECEXP (x, 0, i), call_ok, NULL_RTX))
|
&& ! insn_dead_p (pbi, XVECEXP (x, 0, i), call_ok, NULL_RTX))
|
return 0;
|
return 0;
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* A CLOBBER of a pseudo-register that is dead serves no purpose. That
|
/* A CLOBBER of a pseudo-register that is dead serves no purpose. That
|
is not necessarily true for hard registers until after reload. */
|
is not necessarily true for hard registers until after reload. */
|
else if (code == CLOBBER)
|
else if (code == CLOBBER)
|
{
|
{
|
if (REG_P (XEXP (x, 0))
|
if (REG_P (XEXP (x, 0))
|
&& (REGNO (XEXP (x, 0)) >= FIRST_PSEUDO_REGISTER
|
&& (REGNO (XEXP (x, 0)) >= FIRST_PSEUDO_REGISTER
|
|| reload_completed)
|
|| reload_completed)
|
&& ! REGNO_REG_SET_P (pbi->reg_live, REGNO (XEXP (x, 0))))
|
&& ! REGNO_REG_SET_P (pbi->reg_live, REGNO (XEXP (x, 0))))
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* ??? A base USE is a historical relic. It ought not be needed anymore.
|
/* ??? A base USE is a historical relic. It ought not be needed anymore.
|
Instances where it is still used are either (1) temporary and the USE
|
Instances where it is still used are either (1) temporary and the USE
|
escaped the pass, (2) cruft and the USE need not be emitted anymore,
|
escaped the pass, (2) cruft and the USE need not be emitted anymore,
|
or (3) hiding bugs elsewhere that are not properly representing data
|
or (3) hiding bugs elsewhere that are not properly representing data
|
flow. */
|
flow. */
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* If INSN is the last insn in a libcall, and assuming INSN is dead,
|
/* If INSN is the last insn in a libcall, and assuming INSN is dead,
|
return 1 if the entire library call is dead.
|
return 1 if the entire library call is dead.
|
This is true if INSN copies a register (hard or pseudo)
|
This is true if INSN copies a register (hard or pseudo)
|
and if the hard return reg of the call insn is dead.
|
and if the hard return reg of the call insn is dead.
|
(The caller should have tested the destination of the SET inside
|
(The caller should have tested the destination of the SET inside
|
INSN already for death.)
|
INSN already for death.)
|
|
|
If this insn doesn't just copy a register, then we don't
|
If this insn doesn't just copy a register, then we don't
|
have an ordinary libcall. In that case, cse could not have
|
have an ordinary libcall. In that case, cse could not have
|
managed to substitute the source for the dest later on,
|
managed to substitute the source for the dest later on,
|
so we can assume the libcall is dead.
|
so we can assume the libcall is dead.
|
|
|
PBI is the block info giving pseudoregs live before this insn.
|
PBI is the block info giving pseudoregs live before this insn.
|
NOTE is the REG_RETVAL note of the insn. */
|
NOTE is the REG_RETVAL note of the insn. */
|
|
|
static int
|
static int
|
libcall_dead_p (struct propagate_block_info *pbi, rtx note, rtx insn)
|
libcall_dead_p (struct propagate_block_info *pbi, rtx note, rtx insn)
|
{
|
{
|
rtx x = single_set (insn);
|
rtx x = single_set (insn);
|
|
|
if (x)
|
if (x)
|
{
|
{
|
rtx r = SET_SRC (x);
|
rtx r = SET_SRC (x);
|
|
|
if (REG_P (r) || GET_CODE (r) == SUBREG)
|
if (REG_P (r) || GET_CODE (r) == SUBREG)
|
{
|
{
|
rtx call = XEXP (note, 0);
|
rtx call = XEXP (note, 0);
|
rtx call_pat;
|
rtx call_pat;
|
int i;
|
int i;
|
|
|
/* Find the call insn. */
|
/* Find the call insn. */
|
while (call != insn && !CALL_P (call))
|
while (call != insn && !CALL_P (call))
|
call = NEXT_INSN (call);
|
call = NEXT_INSN (call);
|
|
|
/* If there is none, do nothing special,
|
/* If there is none, do nothing special,
|
since ordinary death handling can understand these insns. */
|
since ordinary death handling can understand these insns. */
|
if (call == insn)
|
if (call == insn)
|
return 0;
|
return 0;
|
|
|
/* See if the hard reg holding the value is dead.
|
/* See if the hard reg holding the value is dead.
|
If this is a PARALLEL, find the call within it. */
|
If this is a PARALLEL, find the call within it. */
|
call_pat = PATTERN (call);
|
call_pat = PATTERN (call);
|
if (GET_CODE (call_pat) == PARALLEL)
|
if (GET_CODE (call_pat) == PARALLEL)
|
{
|
{
|
for (i = XVECLEN (call_pat, 0) - 1; i >= 0; i--)
|
for (i = XVECLEN (call_pat, 0) - 1; i >= 0; i--)
|
if (GET_CODE (XVECEXP (call_pat, 0, i)) == SET
|
if (GET_CODE (XVECEXP (call_pat, 0, i)) == SET
|
&& GET_CODE (SET_SRC (XVECEXP (call_pat, 0, i))) == CALL)
|
&& GET_CODE (SET_SRC (XVECEXP (call_pat, 0, i))) == CALL)
|
break;
|
break;
|
|
|
/* This may be a library call that is returning a value
|
/* This may be a library call that is returning a value
|
via invisible pointer. Do nothing special, since
|
via invisible pointer. Do nothing special, since
|
ordinary death handling can understand these insns. */
|
ordinary death handling can understand these insns. */
|
if (i < 0)
|
if (i < 0)
|
return 0;
|
return 0;
|
|
|
call_pat = XVECEXP (call_pat, 0, i);
|
call_pat = XVECEXP (call_pat, 0, i);
|
}
|
}
|
|
|
if (! insn_dead_p (pbi, call_pat, 1, REG_NOTES (call)))
|
if (! insn_dead_p (pbi, call_pat, 1, REG_NOTES (call)))
|
return 0;
|
return 0;
|
|
|
while ((insn = PREV_INSN (insn)) != call)
|
while ((insn = PREV_INSN (insn)) != call)
|
{
|
{
|
if (! INSN_P (insn))
|
if (! INSN_P (insn))
|
continue;
|
continue;
|
if (! insn_dead_p (pbi, PATTERN (insn), 0, REG_NOTES (insn)))
|
if (! insn_dead_p (pbi, PATTERN (insn), 0, REG_NOTES (insn)))
|
return 0;
|
return 0;
|
}
|
}
|
return 1;
|
return 1;
|
}
|
}
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* 1 if register REGNO was alive at a place where `setjmp' was called
|
/* 1 if register REGNO was alive at a place where `setjmp' was called
|
and was set more than once or is an argument.
|
and was set more than once or is an argument.
|
Such regs may be clobbered by `longjmp'. */
|
Such regs may be clobbered by `longjmp'. */
|
|
|
int
|
int
|
regno_clobbered_at_setjmp (int regno)
|
regno_clobbered_at_setjmp (int regno)
|
{
|
{
|
if (n_basic_blocks == NUM_FIXED_BLOCKS)
|
if (n_basic_blocks == NUM_FIXED_BLOCKS)
|
return 0;
|
return 0;
|
|
|
return ((REG_N_SETS (regno) > 1
|
return ((REG_N_SETS (regno) > 1
|
|| REGNO_REG_SET_P (ENTRY_BLOCK_PTR->il.rtl->global_live_at_end,
|
|| REGNO_REG_SET_P (ENTRY_BLOCK_PTR->il.rtl->global_live_at_end,
|
regno))
|
regno))
|
&& REGNO_REG_SET_P (regs_live_at_setjmp, regno));
|
&& REGNO_REG_SET_P (regs_live_at_setjmp, regno));
|
}
|
}
|
|
|
/* Add MEM to PBI->MEM_SET_LIST. MEM should be canonical. Respect the
|
/* Add MEM to PBI->MEM_SET_LIST. MEM should be canonical. Respect the
|
maximal list size; look for overlaps in mode and select the largest. */
|
maximal list size; look for overlaps in mode and select the largest. */
|
static void
|
static void
|
add_to_mem_set_list (struct propagate_block_info *pbi, rtx mem)
|
add_to_mem_set_list (struct propagate_block_info *pbi, rtx mem)
|
{
|
{
|
rtx i;
|
rtx i;
|
|
|
/* We don't know how large a BLKmode store is, so we must not
|
/* We don't know how large a BLKmode store is, so we must not
|
take them into consideration. */
|
take them into consideration. */
|
if (GET_MODE (mem) == BLKmode)
|
if (GET_MODE (mem) == BLKmode)
|
return;
|
return;
|
|
|
for (i = pbi->mem_set_list; i ; i = XEXP (i, 1))
|
for (i = pbi->mem_set_list; i ; i = XEXP (i, 1))
|
{
|
{
|
rtx e = XEXP (i, 0);
|
rtx e = XEXP (i, 0);
|
if (rtx_equal_p (XEXP (mem, 0), XEXP (e, 0)))
|
if (rtx_equal_p (XEXP (mem, 0), XEXP (e, 0)))
|
{
|
{
|
if (GET_MODE_SIZE (GET_MODE (mem)) > GET_MODE_SIZE (GET_MODE (e)))
|
if (GET_MODE_SIZE (GET_MODE (mem)) > GET_MODE_SIZE (GET_MODE (e)))
|
{
|
{
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
/* If we must store a copy of the mem, we can just modify
|
/* If we must store a copy of the mem, we can just modify
|
the mode of the stored copy. */
|
the mode of the stored copy. */
|
if (pbi->flags & PROP_AUTOINC)
|
if (pbi->flags & PROP_AUTOINC)
|
PUT_MODE (e, GET_MODE (mem));
|
PUT_MODE (e, GET_MODE (mem));
|
else
|
else
|
#endif
|
#endif
|
XEXP (i, 0) = mem;
|
XEXP (i, 0) = mem;
|
}
|
}
|
return;
|
return;
|
}
|
}
|
}
|
}
|
|
|
if (pbi->mem_set_list_len < PARAM_VALUE (PARAM_MAX_FLOW_MEMORY_LOCATIONS))
|
if (pbi->mem_set_list_len < PARAM_VALUE (PARAM_MAX_FLOW_MEMORY_LOCATIONS))
|
{
|
{
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
/* Store a copy of mem, otherwise the address may be
|
/* Store a copy of mem, otherwise the address may be
|
scrogged by find_auto_inc. */
|
scrogged by find_auto_inc. */
|
if (pbi->flags & PROP_AUTOINC)
|
if (pbi->flags & PROP_AUTOINC)
|
mem = shallow_copy_rtx (mem);
|
mem = shallow_copy_rtx (mem);
|
#endif
|
#endif
|
pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list);
|
pbi->mem_set_list = alloc_EXPR_LIST (0, mem, pbi->mem_set_list);
|
pbi->mem_set_list_len++;
|
pbi->mem_set_list_len++;
|
}
|
}
|
}
|
}
|
|
|
/* INSN references memory, possibly using autoincrement addressing modes.
|
/* INSN references memory, possibly using autoincrement addressing modes.
|
Find any entries on the mem_set_list that need to be invalidated due
|
Find any entries on the mem_set_list that need to be invalidated due
|
to an address change. */
|
to an address change. */
|
|
|
static int
|
static int
|
invalidate_mems_from_autoinc (rtx *px, void *data)
|
invalidate_mems_from_autoinc (rtx *px, void *data)
|
{
|
{
|
rtx x = *px;
|
rtx x = *px;
|
struct propagate_block_info *pbi = data;
|
struct propagate_block_info *pbi = data;
|
|
|
if (GET_RTX_CLASS (GET_CODE (x)) == RTX_AUTOINC)
|
if (GET_RTX_CLASS (GET_CODE (x)) == RTX_AUTOINC)
|
{
|
{
|
invalidate_mems_from_set (pbi, XEXP (x, 0));
|
invalidate_mems_from_set (pbi, XEXP (x, 0));
|
return -1;
|
return -1;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* EXP is a REG or MEM. Remove any dependent entries from
|
/* EXP is a REG or MEM. Remove any dependent entries from
|
pbi->mem_set_list. */
|
pbi->mem_set_list. */
|
|
|
static void
|
static void
|
invalidate_mems_from_set (struct propagate_block_info *pbi, rtx exp)
|
invalidate_mems_from_set (struct propagate_block_info *pbi, rtx exp)
|
{
|
{
|
rtx temp = pbi->mem_set_list;
|
rtx temp = pbi->mem_set_list;
|
rtx prev = NULL_RTX;
|
rtx prev = NULL_RTX;
|
rtx next;
|
rtx next;
|
|
|
while (temp)
|
while (temp)
|
{
|
{
|
next = XEXP (temp, 1);
|
next = XEXP (temp, 1);
|
if ((REG_P (exp) && reg_overlap_mentioned_p (exp, XEXP (temp, 0)))
|
if ((REG_P (exp) && reg_overlap_mentioned_p (exp, XEXP (temp, 0)))
|
/* When we get an EXP that is a mem here, we want to check if EXP
|
/* When we get an EXP that is a mem here, we want to check if EXP
|
overlaps the *address* of any of the mems in the list (i.e. not
|
overlaps the *address* of any of the mems in the list (i.e. not
|
whether the mems actually overlap; that's done elsewhere). */
|
whether the mems actually overlap; that's done elsewhere). */
|
|| (MEM_P (exp)
|
|| (MEM_P (exp)
|
&& reg_overlap_mentioned_p (exp, XEXP (XEXP (temp, 0), 0))))
|
&& reg_overlap_mentioned_p (exp, XEXP (XEXP (temp, 0), 0))))
|
{
|
{
|
/* Splice this entry out of the list. */
|
/* Splice this entry out of the list. */
|
if (prev)
|
if (prev)
|
XEXP (prev, 1) = next;
|
XEXP (prev, 1) = next;
|
else
|
else
|
pbi->mem_set_list = next;
|
pbi->mem_set_list = next;
|
free_EXPR_LIST_node (temp);
|
free_EXPR_LIST_node (temp);
|
pbi->mem_set_list_len--;
|
pbi->mem_set_list_len--;
|
}
|
}
|
else
|
else
|
prev = temp;
|
prev = temp;
|
temp = next;
|
temp = next;
|
}
|
}
|
}
|
}
|
|
|
/* Process the registers that are set within X. Their bits are set to
|
/* Process the registers that are set within X. Their bits are set to
|
1 in the regset DEAD, because they are dead prior to this insn.
|
1 in the regset DEAD, because they are dead prior to this insn.
|
|
|
If INSN is nonzero, it is the insn being processed.
|
If INSN is nonzero, it is the insn being processed.
|
|
|
FLAGS is the set of operations to perform. */
|
FLAGS is the set of operations to perform. */
|
|
|
static void
|
static void
|
mark_set_regs (struct propagate_block_info *pbi, rtx x, rtx insn)
|
mark_set_regs (struct propagate_block_info *pbi, rtx x, rtx insn)
|
{
|
{
|
rtx cond = NULL_RTX;
|
rtx cond = NULL_RTX;
|
rtx link;
|
rtx link;
|
enum rtx_code code;
|
enum rtx_code code;
|
int flags = pbi->flags;
|
int flags = pbi->flags;
|
|
|
if (insn)
|
if (insn)
|
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
|
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
|
{
|
{
|
if (REG_NOTE_KIND (link) == REG_INC)
|
if (REG_NOTE_KIND (link) == REG_INC)
|
mark_set_1 (pbi, SET, XEXP (link, 0),
|
mark_set_1 (pbi, SET, XEXP (link, 0),
|
(GET_CODE (x) == COND_EXEC
|
(GET_CODE (x) == COND_EXEC
|
? COND_EXEC_TEST (x) : NULL_RTX),
|
? COND_EXEC_TEST (x) : NULL_RTX),
|
insn, flags);
|
insn, flags);
|
}
|
}
|
retry:
|
retry:
|
switch (code = GET_CODE (x))
|
switch (code = GET_CODE (x))
|
{
|
{
|
case SET:
|
case SET:
|
if (GET_CODE (XEXP (x, 1)) == ASM_OPERANDS)
|
if (GET_CODE (XEXP (x, 1)) == ASM_OPERANDS)
|
flags |= PROP_ASM_SCAN;
|
flags |= PROP_ASM_SCAN;
|
/* Fall through */
|
/* Fall through */
|
case CLOBBER:
|
case CLOBBER:
|
mark_set_1 (pbi, code, SET_DEST (x), cond, insn, flags);
|
mark_set_1 (pbi, code, SET_DEST (x), cond, insn, flags);
|
return;
|
return;
|
|
|
case COND_EXEC:
|
case COND_EXEC:
|
cond = COND_EXEC_TEST (x);
|
cond = COND_EXEC_TEST (x);
|
x = COND_EXEC_CODE (x);
|
x = COND_EXEC_CODE (x);
|
goto retry;
|
goto retry;
|
|
|
case PARALLEL:
|
case PARALLEL:
|
{
|
{
|
int i;
|
int i;
|
|
|
/* We must scan forwards. If we have an asm, we need to set
|
/* We must scan forwards. If we have an asm, we need to set
|
the PROP_ASM_SCAN flag before scanning the clobbers. */
|
the PROP_ASM_SCAN flag before scanning the clobbers. */
|
for (i = 0; i < XVECLEN (x, 0); i++)
|
for (i = 0; i < XVECLEN (x, 0); i++)
|
{
|
{
|
rtx sub = XVECEXP (x, 0, i);
|
rtx sub = XVECEXP (x, 0, i);
|
switch (code = GET_CODE (sub))
|
switch (code = GET_CODE (sub))
|
{
|
{
|
case COND_EXEC:
|
case COND_EXEC:
|
gcc_assert (!cond);
|
gcc_assert (!cond);
|
|
|
cond = COND_EXEC_TEST (sub);
|
cond = COND_EXEC_TEST (sub);
|
sub = COND_EXEC_CODE (sub);
|
sub = COND_EXEC_CODE (sub);
|
if (GET_CODE (sub) == SET)
|
if (GET_CODE (sub) == SET)
|
goto mark_set;
|
goto mark_set;
|
if (GET_CODE (sub) == CLOBBER)
|
if (GET_CODE (sub) == CLOBBER)
|
goto mark_clob;
|
goto mark_clob;
|
break;
|
break;
|
|
|
case SET:
|
case SET:
|
mark_set:
|
mark_set:
|
if (GET_CODE (XEXP (sub, 1)) == ASM_OPERANDS)
|
if (GET_CODE (XEXP (sub, 1)) == ASM_OPERANDS)
|
flags |= PROP_ASM_SCAN;
|
flags |= PROP_ASM_SCAN;
|
/* Fall through */
|
/* Fall through */
|
case CLOBBER:
|
case CLOBBER:
|
mark_clob:
|
mark_clob:
|
mark_set_1 (pbi, code, SET_DEST (sub), cond, insn, flags);
|
mark_set_1 (pbi, code, SET_DEST (sub), cond, insn, flags);
|
break;
|
break;
|
|
|
case ASM_OPERANDS:
|
case ASM_OPERANDS:
|
flags |= PROP_ASM_SCAN;
|
flags |= PROP_ASM_SCAN;
|
break;
|
break;
|
|
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
}
|
}
|
break;
|
break;
|
}
|
}
|
|
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
}
|
}
|
|
|
/* Process a single set, which appears in INSN. REG (which may not
|
/* Process a single set, which appears in INSN. REG (which may not
|
actually be a REG, it may also be a SUBREG, PARALLEL, etc.) is
|
actually be a REG, it may also be a SUBREG, PARALLEL, etc.) is
|
being set using the CODE (which may be SET, CLOBBER, or COND_EXEC).
|
being set using the CODE (which may be SET, CLOBBER, or COND_EXEC).
|
If the set is conditional (because it appear in a COND_EXEC), COND
|
If the set is conditional (because it appear in a COND_EXEC), COND
|
will be the condition. */
|
will be the condition. */
|
|
|
static void
|
static void
|
mark_set_1 (struct propagate_block_info *pbi, enum rtx_code code, rtx reg, rtx cond, rtx insn, int flags)
|
mark_set_1 (struct propagate_block_info *pbi, enum rtx_code code, rtx reg, rtx cond, rtx insn, int flags)
|
{
|
{
|
int regno_first = -1, regno_last = -1;
|
int regno_first = -1, regno_last = -1;
|
unsigned long not_dead = 0;
|
unsigned long not_dead = 0;
|
int i;
|
int i;
|
|
|
/* Modifying just one hardware register of a multi-reg value or just a
|
/* Modifying just one hardware register of a multi-reg value or just a
|
byte field of a register does not mean the value from before this insn
|
byte field of a register does not mean the value from before this insn
|
is now dead. Of course, if it was dead after it's unused now. */
|
is now dead. Of course, if it was dead after it's unused now. */
|
|
|
switch (GET_CODE (reg))
|
switch (GET_CODE (reg))
|
{
|
{
|
case PARALLEL:
|
case PARALLEL:
|
/* Some targets place small structures in registers for return values of
|
/* Some targets place small structures in registers for return values of
|
functions. We have to detect this case specially here to get correct
|
functions. We have to detect this case specially here to get correct
|
flow information. */
|
flow information. */
|
for (i = XVECLEN (reg, 0) - 1; i >= 0; i--)
|
for (i = XVECLEN (reg, 0) - 1; i >= 0; i--)
|
if (XEXP (XVECEXP (reg, 0, i), 0) != 0)
|
if (XEXP (XVECEXP (reg, 0, i), 0) != 0)
|
mark_set_1 (pbi, code, XEXP (XVECEXP (reg, 0, i), 0), cond, insn,
|
mark_set_1 (pbi, code, XEXP (XVECEXP (reg, 0, i), 0), cond, insn,
|
flags);
|
flags);
|
return;
|
return;
|
|
|
case SIGN_EXTRACT:
|
case SIGN_EXTRACT:
|
/* SIGN_EXTRACT cannot be an lvalue. */
|
/* SIGN_EXTRACT cannot be an lvalue. */
|
gcc_unreachable ();
|
gcc_unreachable ();
|
|
|
case ZERO_EXTRACT:
|
case ZERO_EXTRACT:
|
case STRICT_LOW_PART:
|
case STRICT_LOW_PART:
|
/* ??? Assumes STRICT_LOW_PART not used on multi-word registers. */
|
/* ??? Assumes STRICT_LOW_PART not used on multi-word registers. */
|
do
|
do
|
reg = XEXP (reg, 0);
|
reg = XEXP (reg, 0);
|
while (GET_CODE (reg) == SUBREG
|
while (GET_CODE (reg) == SUBREG
|
|| GET_CODE (reg) == ZERO_EXTRACT
|
|| GET_CODE (reg) == ZERO_EXTRACT
|
|| GET_CODE (reg) == STRICT_LOW_PART);
|
|| GET_CODE (reg) == STRICT_LOW_PART);
|
if (MEM_P (reg))
|
if (MEM_P (reg))
|
break;
|
break;
|
not_dead = (unsigned long) REGNO_REG_SET_P (pbi->reg_live, REGNO (reg));
|
not_dead = (unsigned long) REGNO_REG_SET_P (pbi->reg_live, REGNO (reg));
|
/* Fall through. */
|
/* Fall through. */
|
|
|
case REG:
|
case REG:
|
regno_last = regno_first = REGNO (reg);
|
regno_last = regno_first = REGNO (reg);
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
regno_last += hard_regno_nregs[regno_first][GET_MODE (reg)] - 1;
|
regno_last += hard_regno_nregs[regno_first][GET_MODE (reg)] - 1;
|
break;
|
break;
|
|
|
case SUBREG:
|
case SUBREG:
|
if (REG_P (SUBREG_REG (reg)))
|
if (REG_P (SUBREG_REG (reg)))
|
{
|
{
|
enum machine_mode outer_mode = GET_MODE (reg);
|
enum machine_mode outer_mode = GET_MODE (reg);
|
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (reg));
|
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (reg));
|
|
|
/* Identify the range of registers affected. This is moderately
|
/* Identify the range of registers affected. This is moderately
|
tricky for hard registers. See alter_subreg. */
|
tricky for hard registers. See alter_subreg. */
|
|
|
regno_last = regno_first = REGNO (SUBREG_REG (reg));
|
regno_last = regno_first = REGNO (SUBREG_REG (reg));
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
{
|
{
|
regno_first += subreg_regno_offset (regno_first, inner_mode,
|
regno_first += subreg_regno_offset (regno_first, inner_mode,
|
SUBREG_BYTE (reg),
|
SUBREG_BYTE (reg),
|
outer_mode);
|
outer_mode);
|
regno_last = (regno_first
|
regno_last = (regno_first
|
+ hard_regno_nregs[regno_first][outer_mode] - 1);
|
+ hard_regno_nregs[regno_first][outer_mode] - 1);
|
|
|
/* Since we've just adjusted the register number ranges, make
|
/* Since we've just adjusted the register number ranges, make
|
sure REG matches. Otherwise some_was_live will be clear
|
sure REG matches. Otherwise some_was_live will be clear
|
when it shouldn't have been, and we'll create incorrect
|
when it shouldn't have been, and we'll create incorrect
|
REG_UNUSED notes. */
|
REG_UNUSED notes. */
|
reg = gen_rtx_REG (outer_mode, regno_first);
|
reg = gen_rtx_REG (outer_mode, regno_first);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* If the number of words in the subreg is less than the number
|
/* If the number of words in the subreg is less than the number
|
of words in the full register, we have a well-defined partial
|
of words in the full register, we have a well-defined partial
|
set. Otherwise the high bits are undefined.
|
set. Otherwise the high bits are undefined.
|
|
|
This is only really applicable to pseudos, since we just took
|
This is only really applicable to pseudos, since we just took
|
care of multi-word hard registers. */
|
care of multi-word hard registers. */
|
if (((GET_MODE_SIZE (outer_mode)
|
if (((GET_MODE_SIZE (outer_mode)
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD)
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD)
|
< ((GET_MODE_SIZE (inner_mode)
|
< ((GET_MODE_SIZE (inner_mode)
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD))
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD))
|
not_dead = (unsigned long) REGNO_REG_SET_P (pbi->reg_live,
|
not_dead = (unsigned long) REGNO_REG_SET_P (pbi->reg_live,
|
regno_first);
|
regno_first);
|
|
|
reg = SUBREG_REG (reg);
|
reg = SUBREG_REG (reg);
|
}
|
}
|
}
|
}
|
else
|
else
|
reg = SUBREG_REG (reg);
|
reg = SUBREG_REG (reg);
|
break;
|
break;
|
|
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
/* If this set is a MEM, then it kills any aliased writes and any
|
/* If this set is a MEM, then it kills any aliased writes and any
|
other MEMs which use it.
|
other MEMs which use it.
|
If this set is a REG, then it kills any MEMs which use the reg. */
|
If this set is a REG, then it kills any MEMs which use the reg. */
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
{
|
{
|
if (REG_P (reg) || MEM_P (reg))
|
if (REG_P (reg) || MEM_P (reg))
|
invalidate_mems_from_set (pbi, reg);
|
invalidate_mems_from_set (pbi, reg);
|
|
|
/* If the memory reference had embedded side effects (autoincrement
|
/* If the memory reference had embedded side effects (autoincrement
|
address modes) then we may need to kill some entries on the
|
address modes) then we may need to kill some entries on the
|
memory set list. */
|
memory set list. */
|
if (insn && MEM_P (reg))
|
if (insn && MEM_P (reg))
|
for_each_rtx (&PATTERN (insn), invalidate_mems_from_autoinc, pbi);
|
for_each_rtx (&PATTERN (insn), invalidate_mems_from_autoinc, pbi);
|
|
|
if (MEM_P (reg) && ! side_effects_p (reg)
|
if (MEM_P (reg) && ! side_effects_p (reg)
|
/* ??? With more effort we could track conditional memory life. */
|
/* ??? With more effort we could track conditional memory life. */
|
&& ! cond)
|
&& ! cond)
|
add_to_mem_set_list (pbi, canon_rtx (reg));
|
add_to_mem_set_list (pbi, canon_rtx (reg));
|
}
|
}
|
|
|
if (REG_P (reg)
|
if (REG_P (reg)
|
&& ! (regno_first == FRAME_POINTER_REGNUM
|
&& ! (regno_first == FRAME_POINTER_REGNUM
|
&& (! reload_completed || frame_pointer_needed))
|
&& (! reload_completed || frame_pointer_needed))
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
&& ! (regno_first == HARD_FRAME_POINTER_REGNUM
|
&& ! (regno_first == HARD_FRAME_POINTER_REGNUM
|
&& (! reload_completed || frame_pointer_needed))
|
&& (! reload_completed || frame_pointer_needed))
|
#endif
|
#endif
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
&& ! (regno_first == ARG_POINTER_REGNUM && fixed_regs[regno_first])
|
&& ! (regno_first == ARG_POINTER_REGNUM && fixed_regs[regno_first])
|
#endif
|
#endif
|
)
|
)
|
{
|
{
|
int some_was_live = 0, some_was_dead = 0;
|
int some_was_live = 0, some_was_dead = 0;
|
|
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
{
|
{
|
int needed_regno = REGNO_REG_SET_P (pbi->reg_live, i);
|
int needed_regno = REGNO_REG_SET_P (pbi->reg_live, i);
|
if (pbi->local_set)
|
if (pbi->local_set)
|
{
|
{
|
/* Order of the set operation matters here since both
|
/* Order of the set operation matters here since both
|
sets may be the same. */
|
sets may be the same. */
|
CLEAR_REGNO_REG_SET (pbi->cond_local_set, i);
|
CLEAR_REGNO_REG_SET (pbi->cond_local_set, i);
|
if (cond != NULL_RTX
|
if (cond != NULL_RTX
|
&& ! REGNO_REG_SET_P (pbi->local_set, i))
|
&& ! REGNO_REG_SET_P (pbi->local_set, i))
|
SET_REGNO_REG_SET (pbi->cond_local_set, i);
|
SET_REGNO_REG_SET (pbi->cond_local_set, i);
|
else
|
else
|
SET_REGNO_REG_SET (pbi->local_set, i);
|
SET_REGNO_REG_SET (pbi->local_set, i);
|
}
|
}
|
if (code != CLOBBER || needed_regno)
|
if (code != CLOBBER || needed_regno)
|
SET_REGNO_REG_SET (pbi->new_set, i);
|
SET_REGNO_REG_SET (pbi->new_set, i);
|
|
|
some_was_live |= needed_regno;
|
some_was_live |= needed_regno;
|
some_was_dead |= ! needed_regno;
|
some_was_dead |= ! needed_regno;
|
}
|
}
|
|
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
/* Consider conditional death in deciding that the register needs
|
/* Consider conditional death in deciding that the register needs
|
a death note. */
|
a death note. */
|
if (some_was_live && ! not_dead
|
if (some_was_live && ! not_dead
|
/* The stack pointer is never dead. Well, not strictly true,
|
/* The stack pointer is never dead. Well, not strictly true,
|
but it's very difficult to tell from here. Hopefully
|
but it's very difficult to tell from here. Hopefully
|
combine_stack_adjustments will fix up the most egregious
|
combine_stack_adjustments will fix up the most egregious
|
errors. */
|
errors. */
|
&& regno_first != STACK_POINTER_REGNUM)
|
&& regno_first != STACK_POINTER_REGNUM)
|
{
|
{
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
if (! mark_regno_cond_dead (pbi, i, cond))
|
if (! mark_regno_cond_dead (pbi, i, cond))
|
not_dead |= ((unsigned long) 1) << (i - regno_first);
|
not_dead |= ((unsigned long) 1) << (i - regno_first);
|
}
|
}
|
#endif
|
#endif
|
|
|
/* Additional data to record if this is the final pass. */
|
/* Additional data to record if this is the final pass. */
|
if (flags & (PROP_LOG_LINKS | PROP_REG_INFO
|
if (flags & (PROP_LOG_LINKS | PROP_REG_INFO
|
| PROP_DEATH_NOTES | PROP_AUTOINC))
|
| PROP_DEATH_NOTES | PROP_AUTOINC))
|
{
|
{
|
rtx y;
|
rtx y;
|
int blocknum = pbi->bb->index;
|
int blocknum = pbi->bb->index;
|
|
|
y = NULL_RTX;
|
y = NULL_RTX;
|
if (flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
if (flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
{
|
{
|
y = pbi->reg_next_use[regno_first];
|
y = pbi->reg_next_use[regno_first];
|
|
|
/* The next use is no longer next, since a store intervenes. */
|
/* The next use is no longer next, since a store intervenes. */
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
pbi->reg_next_use[i] = 0;
|
pbi->reg_next_use[i] = 0;
|
}
|
}
|
|
|
if (flags & PROP_REG_INFO)
|
if (flags & PROP_REG_INFO)
|
{
|
{
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
{
|
{
|
/* Count (weighted) references, stores, etc. This counts a
|
/* Count (weighted) references, stores, etc. This counts a
|
register twice if it is modified, but that is correct. */
|
register twice if it is modified, but that is correct. */
|
REG_N_SETS (i) += 1;
|
REG_N_SETS (i) += 1;
|
REG_N_REFS (i) += 1;
|
REG_N_REFS (i) += 1;
|
REG_FREQ (i) += REG_FREQ_FROM_BB (pbi->bb);
|
REG_FREQ (i) += REG_FREQ_FROM_BB (pbi->bb);
|
|
|
/* The insns where a reg is live are normally counted
|
/* The insns where a reg is live are normally counted
|
elsewhere, but we want the count to include the insn
|
elsewhere, but we want the count to include the insn
|
where the reg is set, and the normal counting mechanism
|
where the reg is set, and the normal counting mechanism
|
would not count it. */
|
would not count it. */
|
REG_LIVE_LENGTH (i) += 1;
|
REG_LIVE_LENGTH (i) += 1;
|
}
|
}
|
|
|
/* If this is a hard reg, record this function uses the reg. */
|
/* If this is a hard reg, record this function uses the reg. */
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
{
|
{
|
for (i = regno_first; i <= regno_last; i++)
|
for (i = regno_first; i <= regno_last; i++)
|
regs_ever_live[i] = 1;
|
regs_ever_live[i] = 1;
|
if (flags & PROP_ASM_SCAN)
|
if (flags & PROP_ASM_SCAN)
|
for (i = regno_first; i <= regno_last; i++)
|
for (i = regno_first; i <= regno_last; i++)
|
regs_asm_clobbered[i] = 1;
|
regs_asm_clobbered[i] = 1;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Keep track of which basic blocks each reg appears in. */
|
/* Keep track of which basic blocks each reg appears in. */
|
if (REG_BASIC_BLOCK (regno_first) == REG_BLOCK_UNKNOWN)
|
if (REG_BASIC_BLOCK (regno_first) == REG_BLOCK_UNKNOWN)
|
REG_BASIC_BLOCK (regno_first) = blocknum;
|
REG_BASIC_BLOCK (regno_first) = blocknum;
|
else if (REG_BASIC_BLOCK (regno_first) != blocknum)
|
else if (REG_BASIC_BLOCK (regno_first) != blocknum)
|
REG_BASIC_BLOCK (regno_first) = REG_BLOCK_GLOBAL;
|
REG_BASIC_BLOCK (regno_first) = REG_BLOCK_GLOBAL;
|
}
|
}
|
}
|
}
|
|
|
if (! some_was_dead)
|
if (! some_was_dead)
|
{
|
{
|
if (flags & PROP_LOG_LINKS)
|
if (flags & PROP_LOG_LINKS)
|
{
|
{
|
/* Make a logical link from the next following insn
|
/* Make a logical link from the next following insn
|
that uses this register, back to this insn.
|
that uses this register, back to this insn.
|
The following insns have already been processed.
|
The following insns have already been processed.
|
|
|
We don't build a LOG_LINK for hard registers containing
|
We don't build a LOG_LINK for hard registers containing
|
in ASM_OPERANDs. If these registers get replaced,
|
in ASM_OPERANDs. If these registers get replaced,
|
we might wind up changing the semantics of the insn,
|
we might wind up changing the semantics of the insn,
|
even if reload can make what appear to be valid
|
even if reload can make what appear to be valid
|
assignments later.
|
assignments later.
|
|
|
We don't build a LOG_LINK for global registers to
|
We don't build a LOG_LINK for global registers to
|
or from a function call. We don't want to let
|
or from a function call. We don't want to let
|
combine think that it knows what is going on with
|
combine think that it knows what is going on with
|
global registers. */
|
global registers. */
|
if (y && (BLOCK_NUM (y) == blocknum)
|
if (y && (BLOCK_NUM (y) == blocknum)
|
&& (regno_first >= FIRST_PSEUDO_REGISTER
|
&& (regno_first >= FIRST_PSEUDO_REGISTER
|
|| (asm_noperands (PATTERN (y)) < 0
|
|| (asm_noperands (PATTERN (y)) < 0
|
&& ! ((CALL_P (insn)
|
&& ! ((CALL_P (insn)
|
|| CALL_P (y))
|
|| CALL_P (y))
|
&& global_regs[regno_first]))))
|
&& global_regs[regno_first]))))
|
LOG_LINKS (y) = alloc_INSN_LIST (insn, LOG_LINKS (y));
|
LOG_LINKS (y) = alloc_INSN_LIST (insn, LOG_LINKS (y));
|
}
|
}
|
}
|
}
|
else if (not_dead)
|
else if (not_dead)
|
;
|
;
|
else if (! some_was_live)
|
else if (! some_was_live)
|
{
|
{
|
if (flags & PROP_REG_INFO)
|
if (flags & PROP_REG_INFO)
|
REG_N_DEATHS (regno_first) += 1;
|
REG_N_DEATHS (regno_first) += 1;
|
|
|
if (flags & PROP_DEATH_NOTES
|
if (flags & PROP_DEATH_NOTES
|
#ifdef STACK_REGS
|
#ifdef STACK_REGS
|
&& (!(flags & PROP_POST_REGSTACK)
|
&& (!(flags & PROP_POST_REGSTACK)
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG,
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG,
|
LAST_STACK_REG))
|
LAST_STACK_REG))
|
#endif
|
#endif
|
)
|
)
|
{
|
{
|
/* Note that dead stores have already been deleted
|
/* Note that dead stores have already been deleted
|
when possible. If we get here, we have found a
|
when possible. If we get here, we have found a
|
dead store that cannot be eliminated (because the
|
dead store that cannot be eliminated (because the
|
same insn does something useful). Indicate this
|
same insn does something useful). Indicate this
|
by marking the reg being set as dying here. */
|
by marking the reg being set as dying here. */
|
REG_NOTES (insn)
|
REG_NOTES (insn)
|
= alloc_EXPR_LIST (REG_UNUSED, reg, REG_NOTES (insn));
|
= alloc_EXPR_LIST (REG_UNUSED, reg, REG_NOTES (insn));
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
if (flags & PROP_DEATH_NOTES
|
if (flags & PROP_DEATH_NOTES
|
#ifdef STACK_REGS
|
#ifdef STACK_REGS
|
&& (!(flags & PROP_POST_REGSTACK)
|
&& (!(flags & PROP_POST_REGSTACK)
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG,
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG,
|
LAST_STACK_REG))
|
LAST_STACK_REG))
|
#endif
|
#endif
|
)
|
)
|
{
|
{
|
/* This is a case where we have a multi-word hard register
|
/* This is a case where we have a multi-word hard register
|
and some, but not all, of the words of the register are
|
and some, but not all, of the words of the register are
|
needed in subsequent insns. Write REG_UNUSED notes
|
needed in subsequent insns. Write REG_UNUSED notes
|
for those parts that were not needed. This case should
|
for those parts that were not needed. This case should
|
be rare. */
|
be rare. */
|
|
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
if (! REGNO_REG_SET_P (pbi->reg_live, i))
|
if (! REGNO_REG_SET_P (pbi->reg_live, i))
|
REG_NOTES (insn)
|
REG_NOTES (insn)
|
= alloc_EXPR_LIST (REG_UNUSED,
|
= alloc_EXPR_LIST (REG_UNUSED,
|
regno_reg_rtx[i],
|
regno_reg_rtx[i],
|
REG_NOTES (insn));
|
REG_NOTES (insn));
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Mark the register as being dead. */
|
/* Mark the register as being dead. */
|
if (some_was_live
|
if (some_was_live
|
/* The stack pointer is never dead. Well, not strictly true,
|
/* The stack pointer is never dead. Well, not strictly true,
|
but it's very difficult to tell from here. Hopefully
|
but it's very difficult to tell from here. Hopefully
|
combine_stack_adjustments will fix up the most egregious
|
combine_stack_adjustments will fix up the most egregious
|
errors. */
|
errors. */
|
&& regno_first != STACK_POINTER_REGNUM)
|
&& regno_first != STACK_POINTER_REGNUM)
|
{
|
{
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
if (!(not_dead & (((unsigned long) 1) << (i - regno_first))))
|
if (!(not_dead & (((unsigned long) 1) << (i - regno_first))))
|
{
|
{
|
if ((pbi->flags & PROP_REG_INFO)
|
if ((pbi->flags & PROP_REG_INFO)
|
&& REGNO_REG_SET_P (pbi->reg_live, i))
|
&& REGNO_REG_SET_P (pbi->reg_live, i))
|
{
|
{
|
REG_LIVE_LENGTH (i) += pbi->insn_num - reg_deaths[i];
|
REG_LIVE_LENGTH (i) += pbi->insn_num - reg_deaths[i];
|
reg_deaths[i] = 0;
|
reg_deaths[i] = 0;
|
}
|
}
|
CLEAR_REGNO_REG_SET (pbi->reg_live, i);
|
CLEAR_REGNO_REG_SET (pbi->reg_live, i);
|
}
|
}
|
if (flags & PROP_DEAD_INSN)
|
if (flags & PROP_DEAD_INSN)
|
emit_insn_after (gen_rtx_CLOBBER (VOIDmode, reg), insn);
|
emit_insn_after (gen_rtx_CLOBBER (VOIDmode, reg), insn);
|
}
|
}
|
}
|
}
|
else if (REG_P (reg))
|
else if (REG_P (reg))
|
{
|
{
|
if (flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
if (flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
pbi->reg_next_use[regno_first] = 0;
|
pbi->reg_next_use[regno_first] = 0;
|
|
|
if ((flags & PROP_REG_INFO) != 0
|
if ((flags & PROP_REG_INFO) != 0
|
&& (flags & PROP_ASM_SCAN) != 0
|
&& (flags & PROP_ASM_SCAN) != 0
|
&& regno_first < FIRST_PSEUDO_REGISTER)
|
&& regno_first < FIRST_PSEUDO_REGISTER)
|
{
|
{
|
for (i = regno_first; i <= regno_last; i++)
|
for (i = regno_first; i <= regno_last; i++)
|
regs_asm_clobbered[i] = 1;
|
regs_asm_clobbered[i] = 1;
|
}
|
}
|
}
|
}
|
|
|
/* If this is the last pass and this is a SCRATCH, show it will be dying
|
/* If this is the last pass and this is a SCRATCH, show it will be dying
|
here and count it. */
|
here and count it. */
|
else if (GET_CODE (reg) == SCRATCH)
|
else if (GET_CODE (reg) == SCRATCH)
|
{
|
{
|
if (flags & PROP_DEATH_NOTES
|
if (flags & PROP_DEATH_NOTES
|
#ifdef STACK_REGS
|
#ifdef STACK_REGS
|
&& (!(flags & PROP_POST_REGSTACK)
|
&& (!(flags & PROP_POST_REGSTACK)
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG, LAST_STACK_REG))
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG, LAST_STACK_REG))
|
#endif
|
#endif
|
)
|
)
|
REG_NOTES (insn)
|
REG_NOTES (insn)
|
= alloc_EXPR_LIST (REG_UNUSED, reg, REG_NOTES (insn));
|
= alloc_EXPR_LIST (REG_UNUSED, reg, REG_NOTES (insn));
|
}
|
}
|
}
|
}
|
|
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
/* Mark REGNO conditionally dead.
|
/* Mark REGNO conditionally dead.
|
Return true if the register is now unconditionally dead. */
|
Return true if the register is now unconditionally dead. */
|
|
|
static int
|
static int
|
mark_regno_cond_dead (struct propagate_block_info *pbi, int regno, rtx cond)
|
mark_regno_cond_dead (struct propagate_block_info *pbi, int regno, rtx cond)
|
{
|
{
|
/* If this is a store to a predicate register, the value of the
|
/* If this is a store to a predicate register, the value of the
|
predicate is changing, we don't know that the predicate as seen
|
predicate is changing, we don't know that the predicate as seen
|
before is the same as that seen after. Flush all dependent
|
before is the same as that seen after. Flush all dependent
|
conditions from reg_cond_dead. This will make all such
|
conditions from reg_cond_dead. This will make all such
|
conditionally live registers unconditionally live. */
|
conditionally live registers unconditionally live. */
|
if (REGNO_REG_SET_P (pbi->reg_cond_reg, regno))
|
if (REGNO_REG_SET_P (pbi->reg_cond_reg, regno))
|
flush_reg_cond_reg (pbi, regno);
|
flush_reg_cond_reg (pbi, regno);
|
|
|
/* If this is an unconditional store, remove any conditional
|
/* If this is an unconditional store, remove any conditional
|
life that may have existed. */
|
life that may have existed. */
|
if (cond == NULL_RTX)
|
if (cond == NULL_RTX)
|
splay_tree_remove (pbi->reg_cond_dead, regno);
|
splay_tree_remove (pbi->reg_cond_dead, regno);
|
else
|
else
|
{
|
{
|
splay_tree_node node;
|
splay_tree_node node;
|
struct reg_cond_life_info *rcli;
|
struct reg_cond_life_info *rcli;
|
rtx ncond;
|
rtx ncond;
|
|
|
/* Otherwise this is a conditional set. Record that fact.
|
/* Otherwise this is a conditional set. Record that fact.
|
It may have been conditionally used, or there may be a
|
It may have been conditionally used, or there may be a
|
subsequent set with a complementary condition. */
|
subsequent set with a complementary condition. */
|
|
|
node = splay_tree_lookup (pbi->reg_cond_dead, regno);
|
node = splay_tree_lookup (pbi->reg_cond_dead, regno);
|
if (node == NULL)
|
if (node == NULL)
|
{
|
{
|
/* The register was unconditionally live previously.
|
/* The register was unconditionally live previously.
|
Record the current condition as the condition under
|
Record the current condition as the condition under
|
which it is dead. */
|
which it is dead. */
|
rcli = XNEW (struct reg_cond_life_info);
|
rcli = XNEW (struct reg_cond_life_info);
|
rcli->condition = cond;
|
rcli->condition = cond;
|
rcli->stores = cond;
|
rcli->stores = cond;
|
rcli->orig_condition = const0_rtx;
|
rcli->orig_condition = const0_rtx;
|
splay_tree_insert (pbi->reg_cond_dead, regno,
|
splay_tree_insert (pbi->reg_cond_dead, regno,
|
(splay_tree_value) rcli);
|
(splay_tree_value) rcli);
|
|
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (XEXP (cond, 0)));
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (XEXP (cond, 0)));
|
|
|
/* Not unconditionally dead. */
|
/* Not unconditionally dead. */
|
return 0;
|
return 0;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* The register was conditionally live previously.
|
/* The register was conditionally live previously.
|
Add the new condition to the old. */
|
Add the new condition to the old. */
|
rcli = (struct reg_cond_life_info *) node->value;
|
rcli = (struct reg_cond_life_info *) node->value;
|
ncond = rcli->condition;
|
ncond = rcli->condition;
|
ncond = ior_reg_cond (ncond, cond, 1);
|
ncond = ior_reg_cond (ncond, cond, 1);
|
if (rcli->stores == const0_rtx)
|
if (rcli->stores == const0_rtx)
|
rcli->stores = cond;
|
rcli->stores = cond;
|
else if (rcli->stores != const1_rtx)
|
else if (rcli->stores != const1_rtx)
|
rcli->stores = ior_reg_cond (rcli->stores, cond, 1);
|
rcli->stores = ior_reg_cond (rcli->stores, cond, 1);
|
|
|
/* If the register is now unconditionally dead, remove the entry
|
/* If the register is now unconditionally dead, remove the entry
|
in the splay_tree. A register is unconditionally dead if the
|
in the splay_tree. A register is unconditionally dead if the
|
dead condition ncond is true. A register is also unconditionally
|
dead condition ncond is true. A register is also unconditionally
|
dead if the sum of all conditional stores is an unconditional
|
dead if the sum of all conditional stores is an unconditional
|
store (stores is true), and the dead condition is identically the
|
store (stores is true), and the dead condition is identically the
|
same as the original dead condition initialized at the end of
|
same as the original dead condition initialized at the end of
|
the block. This is a pointer compare, not an rtx_equal_p
|
the block. This is a pointer compare, not an rtx_equal_p
|
compare. */
|
compare. */
|
if (ncond == const1_rtx
|
if (ncond == const1_rtx
|
|| (ncond == rcli->orig_condition && rcli->stores == const1_rtx))
|
|| (ncond == rcli->orig_condition && rcli->stores == const1_rtx))
|
splay_tree_remove (pbi->reg_cond_dead, regno);
|
splay_tree_remove (pbi->reg_cond_dead, regno);
|
else
|
else
|
{
|
{
|
rcli->condition = ncond;
|
rcli->condition = ncond;
|
|
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (XEXP (cond, 0)));
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (XEXP (cond, 0)));
|
|
|
/* Not unconditionally dead. */
|
/* Not unconditionally dead. */
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Called from splay_tree_delete for pbi->reg_cond_life. */
|
/* Called from splay_tree_delete for pbi->reg_cond_life. */
|
|
|
static void
|
static void
|
free_reg_cond_life_info (splay_tree_value value)
|
free_reg_cond_life_info (splay_tree_value value)
|
{
|
{
|
struct reg_cond_life_info *rcli = (struct reg_cond_life_info *) value;
|
struct reg_cond_life_info *rcli = (struct reg_cond_life_info *) value;
|
free (rcli);
|
free (rcli);
|
}
|
}
|
|
|
/* Helper function for flush_reg_cond_reg. */
|
/* Helper function for flush_reg_cond_reg. */
|
|
|
static int
|
static int
|
flush_reg_cond_reg_1 (splay_tree_node node, void *data)
|
flush_reg_cond_reg_1 (splay_tree_node node, void *data)
|
{
|
{
|
struct reg_cond_life_info *rcli;
|
struct reg_cond_life_info *rcli;
|
int *xdata = (int *) data;
|
int *xdata = (int *) data;
|
unsigned int regno = xdata[0];
|
unsigned int regno = xdata[0];
|
|
|
/* Don't need to search if last flushed value was farther on in
|
/* Don't need to search if last flushed value was farther on in
|
the in-order traversal. */
|
the in-order traversal. */
|
if (xdata[1] >= (int) node->key)
|
if (xdata[1] >= (int) node->key)
|
return 0;
|
return 0;
|
|
|
/* Splice out portions of the expression that refer to regno. */
|
/* Splice out portions of the expression that refer to regno. */
|
rcli = (struct reg_cond_life_info *) node->value;
|
rcli = (struct reg_cond_life_info *) node->value;
|
rcli->condition = elim_reg_cond (rcli->condition, regno);
|
rcli->condition = elim_reg_cond (rcli->condition, regno);
|
if (rcli->stores != const0_rtx && rcli->stores != const1_rtx)
|
if (rcli->stores != const0_rtx && rcli->stores != const1_rtx)
|
rcli->stores = elim_reg_cond (rcli->stores, regno);
|
rcli->stores = elim_reg_cond (rcli->stores, regno);
|
|
|
/* If the entire condition is now false, signal the node to be removed. */
|
/* If the entire condition is now false, signal the node to be removed. */
|
if (rcli->condition == const0_rtx)
|
if (rcli->condition == const0_rtx)
|
{
|
{
|
xdata[1] = node->key;
|
xdata[1] = node->key;
|
return -1;
|
return -1;
|
}
|
}
|
else
|
else
|
gcc_assert (rcli->condition != const1_rtx);
|
gcc_assert (rcli->condition != const1_rtx);
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Flush all (sub) expressions referring to REGNO from REG_COND_LIVE. */
|
/* Flush all (sub) expressions referring to REGNO from REG_COND_LIVE. */
|
|
|
static void
|
static void
|
flush_reg_cond_reg (struct propagate_block_info *pbi, int regno)
|
flush_reg_cond_reg (struct propagate_block_info *pbi, int regno)
|
{
|
{
|
int pair[2];
|
int pair[2];
|
|
|
pair[0] = regno;
|
pair[0] = regno;
|
pair[1] = -1;
|
pair[1] = -1;
|
while (splay_tree_foreach (pbi->reg_cond_dead,
|
while (splay_tree_foreach (pbi->reg_cond_dead,
|
flush_reg_cond_reg_1, pair) == -1)
|
flush_reg_cond_reg_1, pair) == -1)
|
splay_tree_remove (pbi->reg_cond_dead, pair[1]);
|
splay_tree_remove (pbi->reg_cond_dead, pair[1]);
|
|
|
CLEAR_REGNO_REG_SET (pbi->reg_cond_reg, regno);
|
CLEAR_REGNO_REG_SET (pbi->reg_cond_reg, regno);
|
}
|
}
|
|
|
/* Logical arithmetic on predicate conditions. IOR, NOT and AND.
|
/* Logical arithmetic on predicate conditions. IOR, NOT and AND.
|
For ior/and, the ADD flag determines whether we want to add the new
|
For ior/and, the ADD flag determines whether we want to add the new
|
condition X to the old one unconditionally. If it is zero, we will
|
condition X to the old one unconditionally. If it is zero, we will
|
only return a new expression if X allows us to simplify part of
|
only return a new expression if X allows us to simplify part of
|
OLD, otherwise we return NULL to the caller.
|
OLD, otherwise we return NULL to the caller.
|
If ADD is nonzero, we will return a new condition in all cases. The
|
If ADD is nonzero, we will return a new condition in all cases. The
|
toplevel caller of one of these functions should always pass 1 for
|
toplevel caller of one of these functions should always pass 1 for
|
ADD. */
|
ADD. */
|
|
|
static rtx
|
static rtx
|
ior_reg_cond (rtx old, rtx x, int add)
|
ior_reg_cond (rtx old, rtx x, int add)
|
{
|
{
|
rtx op0, op1;
|
rtx op0, op1;
|
|
|
if (COMPARISON_P (old))
|
if (COMPARISON_P (old))
|
{
|
{
|
if (COMPARISON_P (x)
|
if (COMPARISON_P (x)
|
&& REVERSE_CONDEXEC_PREDICATES_P (x, old)
|
&& REVERSE_CONDEXEC_PREDICATES_P (x, old)
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
return const1_rtx;
|
return const1_rtx;
|
if (GET_CODE (x) == GET_CODE (old)
|
if (GET_CODE (x) == GET_CODE (old)
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
return old;
|
return old;
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_IOR (0, old, x);
|
return gen_rtx_IOR (0, old, x);
|
}
|
}
|
|
|
switch (GET_CODE (old))
|
switch (GET_CODE (old))
|
{
|
{
|
case IOR:
|
case IOR:
|
op0 = ior_reg_cond (XEXP (old, 0), x, 0);
|
op0 = ior_reg_cond (XEXP (old, 0), x, 0);
|
op1 = ior_reg_cond (XEXP (old, 1), x, 0);
|
op1 = ior_reg_cond (XEXP (old, 1), x, 0);
|
if (op0 != NULL || op1 != NULL)
|
if (op0 != NULL || op1 != NULL)
|
{
|
{
|
if (op0 == const0_rtx)
|
if (op0 == const0_rtx)
|
return op1 ? op1 : gen_rtx_IOR (0, XEXP (old, 1), x);
|
return op1 ? op1 : gen_rtx_IOR (0, XEXP (old, 1), x);
|
if (op1 == const0_rtx)
|
if (op1 == const0_rtx)
|
return op0 ? op0 : gen_rtx_IOR (0, XEXP (old, 0), x);
|
return op0 ? op0 : gen_rtx_IOR (0, XEXP (old, 0), x);
|
if (op0 == const1_rtx || op1 == const1_rtx)
|
if (op0 == const1_rtx || op1 == const1_rtx)
|
return const1_rtx;
|
return const1_rtx;
|
if (op0 == NULL)
|
if (op0 == NULL)
|
op0 = gen_rtx_IOR (0, XEXP (old, 0), x);
|
op0 = gen_rtx_IOR (0, XEXP (old, 0), x);
|
else if (rtx_equal_p (x, op0))
|
else if (rtx_equal_p (x, op0))
|
/* (x | A) | x ~ (x | A). */
|
/* (x | A) | x ~ (x | A). */
|
return old;
|
return old;
|
if (op1 == NULL)
|
if (op1 == NULL)
|
op1 = gen_rtx_IOR (0, XEXP (old, 1), x);
|
op1 = gen_rtx_IOR (0, XEXP (old, 1), x);
|
else if (rtx_equal_p (x, op1))
|
else if (rtx_equal_p (x, op1))
|
/* (A | x) | x ~ (A | x). */
|
/* (A | x) | x ~ (A | x). */
|
return old;
|
return old;
|
return gen_rtx_IOR (0, op0, op1);
|
return gen_rtx_IOR (0, op0, op1);
|
}
|
}
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_IOR (0, old, x);
|
return gen_rtx_IOR (0, old, x);
|
|
|
case AND:
|
case AND:
|
op0 = ior_reg_cond (XEXP (old, 0), x, 0);
|
op0 = ior_reg_cond (XEXP (old, 0), x, 0);
|
op1 = ior_reg_cond (XEXP (old, 1), x, 0);
|
op1 = ior_reg_cond (XEXP (old, 1), x, 0);
|
if (op0 != NULL || op1 != NULL)
|
if (op0 != NULL || op1 != NULL)
|
{
|
{
|
if (op0 == const1_rtx)
|
if (op0 == const1_rtx)
|
return op1 ? op1 : gen_rtx_IOR (0, XEXP (old, 1), x);
|
return op1 ? op1 : gen_rtx_IOR (0, XEXP (old, 1), x);
|
if (op1 == const1_rtx)
|
if (op1 == const1_rtx)
|
return op0 ? op0 : gen_rtx_IOR (0, XEXP (old, 0), x);
|
return op0 ? op0 : gen_rtx_IOR (0, XEXP (old, 0), x);
|
if (op0 == const0_rtx || op1 == const0_rtx)
|
if (op0 == const0_rtx || op1 == const0_rtx)
|
return const0_rtx;
|
return const0_rtx;
|
if (op0 == NULL)
|
if (op0 == NULL)
|
op0 = gen_rtx_IOR (0, XEXP (old, 0), x);
|
op0 = gen_rtx_IOR (0, XEXP (old, 0), x);
|
else if (rtx_equal_p (x, op0))
|
else if (rtx_equal_p (x, op0))
|
/* (x & A) | x ~ x. */
|
/* (x & A) | x ~ x. */
|
return op0;
|
return op0;
|
if (op1 == NULL)
|
if (op1 == NULL)
|
op1 = gen_rtx_IOR (0, XEXP (old, 1), x);
|
op1 = gen_rtx_IOR (0, XEXP (old, 1), x);
|
else if (rtx_equal_p (x, op1))
|
else if (rtx_equal_p (x, op1))
|
/* (A & x) | x ~ x. */
|
/* (A & x) | x ~ x. */
|
return op1;
|
return op1;
|
return gen_rtx_AND (0, op0, op1);
|
return gen_rtx_AND (0, op0, op1);
|
}
|
}
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_IOR (0, old, x);
|
return gen_rtx_IOR (0, old, x);
|
|
|
case NOT:
|
case NOT:
|
op0 = and_reg_cond (XEXP (old, 0), not_reg_cond (x), 0);
|
op0 = and_reg_cond (XEXP (old, 0), not_reg_cond (x), 0);
|
if (op0 != NULL)
|
if (op0 != NULL)
|
return not_reg_cond (op0);
|
return not_reg_cond (op0);
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_IOR (0, old, x);
|
return gen_rtx_IOR (0, old, x);
|
|
|
default:
|
default:
|
gcc_unreachable ();
|
gcc_unreachable ();
|
}
|
}
|
}
|
}
|
|
|
static rtx
|
static rtx
|
not_reg_cond (rtx x)
|
not_reg_cond (rtx x)
|
{
|
{
|
if (x == const0_rtx)
|
if (x == const0_rtx)
|
return const1_rtx;
|
return const1_rtx;
|
else if (x == const1_rtx)
|
else if (x == const1_rtx)
|
return const0_rtx;
|
return const0_rtx;
|
if (GET_CODE (x) == NOT)
|
if (GET_CODE (x) == NOT)
|
return XEXP (x, 0);
|
return XEXP (x, 0);
|
if (COMPARISON_P (x)
|
if (COMPARISON_P (x)
|
&& REG_P (XEXP (x, 0)))
|
&& REG_P (XEXP (x, 0)))
|
{
|
{
|
gcc_assert (XEXP (x, 1) == const0_rtx);
|
gcc_assert (XEXP (x, 1) == const0_rtx);
|
|
|
return gen_rtx_fmt_ee (reversed_comparison_code (x, NULL),
|
return gen_rtx_fmt_ee (reversed_comparison_code (x, NULL),
|
VOIDmode, XEXP (x, 0), const0_rtx);
|
VOIDmode, XEXP (x, 0), const0_rtx);
|
}
|
}
|
return gen_rtx_NOT (0, x);
|
return gen_rtx_NOT (0, x);
|
}
|
}
|
|
|
static rtx
|
static rtx
|
and_reg_cond (rtx old, rtx x, int add)
|
and_reg_cond (rtx old, rtx x, int add)
|
{
|
{
|
rtx op0, op1;
|
rtx op0, op1;
|
|
|
if (COMPARISON_P (old))
|
if (COMPARISON_P (old))
|
{
|
{
|
if (COMPARISON_P (x)
|
if (COMPARISON_P (x)
|
&& GET_CODE (x) == reversed_comparison_code (old, NULL)
|
&& GET_CODE (x) == reversed_comparison_code (old, NULL)
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
return const0_rtx;
|
return const0_rtx;
|
if (GET_CODE (x) == GET_CODE (old)
|
if (GET_CODE (x) == GET_CODE (old)
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
&& REGNO (XEXP (x, 0)) == REGNO (XEXP (old, 0)))
|
return old;
|
return old;
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_AND (0, old, x);
|
return gen_rtx_AND (0, old, x);
|
}
|
}
|
|
|
switch (GET_CODE (old))
|
switch (GET_CODE (old))
|
{
|
{
|
case IOR:
|
case IOR:
|
op0 = and_reg_cond (XEXP (old, 0), x, 0);
|
op0 = and_reg_cond (XEXP (old, 0), x, 0);
|
op1 = and_reg_cond (XEXP (old, 1), x, 0);
|
op1 = and_reg_cond (XEXP (old, 1), x, 0);
|
if (op0 != NULL || op1 != NULL)
|
if (op0 != NULL || op1 != NULL)
|
{
|
{
|
if (op0 == const0_rtx)
|
if (op0 == const0_rtx)
|
return op1 ? op1 : gen_rtx_AND (0, XEXP (old, 1), x);
|
return op1 ? op1 : gen_rtx_AND (0, XEXP (old, 1), x);
|
if (op1 == const0_rtx)
|
if (op1 == const0_rtx)
|
return op0 ? op0 : gen_rtx_AND (0, XEXP (old, 0), x);
|
return op0 ? op0 : gen_rtx_AND (0, XEXP (old, 0), x);
|
if (op0 == const1_rtx || op1 == const1_rtx)
|
if (op0 == const1_rtx || op1 == const1_rtx)
|
return const1_rtx;
|
return const1_rtx;
|
if (op0 == NULL)
|
if (op0 == NULL)
|
op0 = gen_rtx_AND (0, XEXP (old, 0), x);
|
op0 = gen_rtx_AND (0, XEXP (old, 0), x);
|
else if (rtx_equal_p (x, op0))
|
else if (rtx_equal_p (x, op0))
|
/* (x | A) & x ~ x. */
|
/* (x | A) & x ~ x. */
|
return op0;
|
return op0;
|
if (op1 == NULL)
|
if (op1 == NULL)
|
op1 = gen_rtx_AND (0, XEXP (old, 1), x);
|
op1 = gen_rtx_AND (0, XEXP (old, 1), x);
|
else if (rtx_equal_p (x, op1))
|
else if (rtx_equal_p (x, op1))
|
/* (A | x) & x ~ x. */
|
/* (A | x) & x ~ x. */
|
return op1;
|
return op1;
|
return gen_rtx_IOR (0, op0, op1);
|
return gen_rtx_IOR (0, op0, op1);
|
}
|
}
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_AND (0, old, x);
|
return gen_rtx_AND (0, old, x);
|
|
|
case AND:
|
case AND:
|
op0 = and_reg_cond (XEXP (old, 0), x, 0);
|
op0 = and_reg_cond (XEXP (old, 0), x, 0);
|
op1 = and_reg_cond (XEXP (old, 1), x, 0);
|
op1 = and_reg_cond (XEXP (old, 1), x, 0);
|
if (op0 != NULL || op1 != NULL)
|
if (op0 != NULL || op1 != NULL)
|
{
|
{
|
if (op0 == const1_rtx)
|
if (op0 == const1_rtx)
|
return op1 ? op1 : gen_rtx_AND (0, XEXP (old, 1), x);
|
return op1 ? op1 : gen_rtx_AND (0, XEXP (old, 1), x);
|
if (op1 == const1_rtx)
|
if (op1 == const1_rtx)
|
return op0 ? op0 : gen_rtx_AND (0, XEXP (old, 0), x);
|
return op0 ? op0 : gen_rtx_AND (0, XEXP (old, 0), x);
|
if (op0 == const0_rtx || op1 == const0_rtx)
|
if (op0 == const0_rtx || op1 == const0_rtx)
|
return const0_rtx;
|
return const0_rtx;
|
if (op0 == NULL)
|
if (op0 == NULL)
|
op0 = gen_rtx_AND (0, XEXP (old, 0), x);
|
op0 = gen_rtx_AND (0, XEXP (old, 0), x);
|
else if (rtx_equal_p (x, op0))
|
else if (rtx_equal_p (x, op0))
|
/* (x & A) & x ~ (x & A). */
|
/* (x & A) & x ~ (x & A). */
|
return old;
|
return old;
|
if (op1 == NULL)
|
if (op1 == NULL)
|
op1 = gen_rtx_AND (0, XEXP (old, 1), x);
|
op1 = gen_rtx_AND (0, XEXP (old, 1), x);
|
else if (rtx_equal_p (x, op1))
|
else if (rtx_equal_p (x, op1))
|
/* (A & x) & x ~ (A & x). */
|
/* (A & x) & x ~ (A & x). */
|
return old;
|
return old;
|
return gen_rtx_AND (0, op0, op1);
|
return gen_rtx_AND (0, op0, op1);
|
}
|
}
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_AND (0, old, x);
|
return gen_rtx_AND (0, old, x);
|
|
|
case NOT:
|
case NOT:
|
op0 = ior_reg_cond (XEXP (old, 0), not_reg_cond (x), 0);
|
op0 = ior_reg_cond (XEXP (old, 0), not_reg_cond (x), 0);
|
if (op0 != NULL)
|
if (op0 != NULL)
|
return not_reg_cond (op0);
|
return not_reg_cond (op0);
|
if (! add)
|
if (! add)
|
return NULL;
|
return NULL;
|
return gen_rtx_AND (0, old, x);
|
return gen_rtx_AND (0, old, x);
|
|
|
default:
|
default:
|
gcc_unreachable ();
|
gcc_unreachable ();
|
}
|
}
|
}
|
}
|
|
|
/* Given a condition X, remove references to reg REGNO and return the
|
/* Given a condition X, remove references to reg REGNO and return the
|
new condition. The removal will be done so that all conditions
|
new condition. The removal will be done so that all conditions
|
involving REGNO are considered to evaluate to false. This function
|
involving REGNO are considered to evaluate to false. This function
|
is used when the value of REGNO changes. */
|
is used when the value of REGNO changes. */
|
|
|
static rtx
|
static rtx
|
elim_reg_cond (rtx x, unsigned int regno)
|
elim_reg_cond (rtx x, unsigned int regno)
|
{
|
{
|
rtx op0, op1;
|
rtx op0, op1;
|
|
|
if (COMPARISON_P (x))
|
if (COMPARISON_P (x))
|
{
|
{
|
if (REGNO (XEXP (x, 0)) == regno)
|
if (REGNO (XEXP (x, 0)) == regno)
|
return const0_rtx;
|
return const0_rtx;
|
return x;
|
return x;
|
}
|
}
|
|
|
switch (GET_CODE (x))
|
switch (GET_CODE (x))
|
{
|
{
|
case AND:
|
case AND:
|
op0 = elim_reg_cond (XEXP (x, 0), regno);
|
op0 = elim_reg_cond (XEXP (x, 0), regno);
|
op1 = elim_reg_cond (XEXP (x, 1), regno);
|
op1 = elim_reg_cond (XEXP (x, 1), regno);
|
if (op0 == const0_rtx || op1 == const0_rtx)
|
if (op0 == const0_rtx || op1 == const0_rtx)
|
return const0_rtx;
|
return const0_rtx;
|
if (op0 == const1_rtx)
|
if (op0 == const1_rtx)
|
return op1;
|
return op1;
|
if (op1 == const1_rtx)
|
if (op1 == const1_rtx)
|
return op0;
|
return op0;
|
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1))
|
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1))
|
return x;
|
return x;
|
return gen_rtx_AND (0, op0, op1);
|
return gen_rtx_AND (0, op0, op1);
|
|
|
case IOR:
|
case IOR:
|
op0 = elim_reg_cond (XEXP (x, 0), regno);
|
op0 = elim_reg_cond (XEXP (x, 0), regno);
|
op1 = elim_reg_cond (XEXP (x, 1), regno);
|
op1 = elim_reg_cond (XEXP (x, 1), regno);
|
if (op0 == const1_rtx || op1 == const1_rtx)
|
if (op0 == const1_rtx || op1 == const1_rtx)
|
return const1_rtx;
|
return const1_rtx;
|
if (op0 == const0_rtx)
|
if (op0 == const0_rtx)
|
return op1;
|
return op1;
|
if (op1 == const0_rtx)
|
if (op1 == const0_rtx)
|
return op0;
|
return op0;
|
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1))
|
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1))
|
return x;
|
return x;
|
return gen_rtx_IOR (0, op0, op1);
|
return gen_rtx_IOR (0, op0, op1);
|
|
|
case NOT:
|
case NOT:
|
op0 = elim_reg_cond (XEXP (x, 0), regno);
|
op0 = elim_reg_cond (XEXP (x, 0), regno);
|
if (op0 == const0_rtx)
|
if (op0 == const0_rtx)
|
return const1_rtx;
|
return const1_rtx;
|
if (op0 == const1_rtx)
|
if (op0 == const1_rtx)
|
return const0_rtx;
|
return const0_rtx;
|
if (op0 != XEXP (x, 0))
|
if (op0 != XEXP (x, 0))
|
return not_reg_cond (op0);
|
return not_reg_cond (op0);
|
return x;
|
return x;
|
|
|
default:
|
default:
|
gcc_unreachable ();
|
gcc_unreachable ();
|
}
|
}
|
}
|
}
|
#endif /* HAVE_conditional_execution */
|
#endif /* HAVE_conditional_execution */
|
|
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
|
|
/* Try to substitute the auto-inc expression INC as the address inside
|
/* Try to substitute the auto-inc expression INC as the address inside
|
MEM which occurs in INSN. Currently, the address of MEM is an expression
|
MEM which occurs in INSN. Currently, the address of MEM is an expression
|
involving INCR_REG, and INCR is the next use of INCR_REG; it is an insn
|
involving INCR_REG, and INCR is the next use of INCR_REG; it is an insn
|
that has a single set whose source is a PLUS of INCR_REG and something
|
that has a single set whose source is a PLUS of INCR_REG and something
|
else. */
|
else. */
|
|
|
static void
|
static void
|
attempt_auto_inc (struct propagate_block_info *pbi, rtx inc, rtx insn,
|
attempt_auto_inc (struct propagate_block_info *pbi, rtx inc, rtx insn,
|
rtx mem, rtx incr, rtx incr_reg)
|
rtx mem, rtx incr, rtx incr_reg)
|
{
|
{
|
int regno = REGNO (incr_reg);
|
int regno = REGNO (incr_reg);
|
rtx set = single_set (incr);
|
rtx set = single_set (incr);
|
rtx q = SET_DEST (set);
|
rtx q = SET_DEST (set);
|
rtx y = SET_SRC (set);
|
rtx y = SET_SRC (set);
|
int opnum = XEXP (y, 0) == incr_reg ? 0 : 1;
|
int opnum = XEXP (y, 0) == incr_reg ? 0 : 1;
|
int changed;
|
int changed;
|
|
|
/* Make sure this reg appears only once in this insn. */
|
/* Make sure this reg appears only once in this insn. */
|
if (count_occurrences (PATTERN (insn), incr_reg, 1) != 1)
|
if (count_occurrences (PATTERN (insn), incr_reg, 1) != 1)
|
return;
|
return;
|
|
|
if (dead_or_set_p (incr, incr_reg)
|
if (dead_or_set_p (incr, incr_reg)
|
/* Mustn't autoinc an eliminable register. */
|
/* Mustn't autoinc an eliminable register. */
|
&& (regno >= FIRST_PSEUDO_REGISTER
|
&& (regno >= FIRST_PSEUDO_REGISTER
|
|| ! TEST_HARD_REG_BIT (elim_reg_set, regno)))
|
|| ! TEST_HARD_REG_BIT (elim_reg_set, regno)))
|
{
|
{
|
/* This is the simple case. Try to make the auto-inc. If
|
/* This is the simple case. Try to make the auto-inc. If
|
we can't, we are done. Otherwise, we will do any
|
we can't, we are done. Otherwise, we will do any
|
needed updates below. */
|
needed updates below. */
|
if (! validate_change (insn, &XEXP (mem, 0), inc, 0))
|
if (! validate_change (insn, &XEXP (mem, 0), inc, 0))
|
return;
|
return;
|
}
|
}
|
else if (REG_P (q)
|
else if (REG_P (q)
|
/* PREV_INSN used here to check the semi-open interval
|
/* PREV_INSN used here to check the semi-open interval
|
[insn,incr). */
|
[insn,incr). */
|
&& ! reg_used_between_p (q, PREV_INSN (insn), incr)
|
&& ! reg_used_between_p (q, PREV_INSN (insn), incr)
|
/* We must also check for sets of q as q may be
|
/* We must also check for sets of q as q may be
|
a call clobbered hard register and there may
|
a call clobbered hard register and there may
|
be a call between PREV_INSN (insn) and incr. */
|
be a call between PREV_INSN (insn) and incr. */
|
&& ! reg_set_between_p (q, PREV_INSN (insn), incr))
|
&& ! reg_set_between_p (q, PREV_INSN (insn), incr))
|
{
|
{
|
/* We have *p followed sometime later by q = p+size.
|
/* We have *p followed sometime later by q = p+size.
|
Both p and q must be live afterward,
|
Both p and q must be live afterward,
|
and q is not used between INSN and its assignment.
|
and q is not used between INSN and its assignment.
|
Change it to q = p, ...*q..., q = q+size.
|
Change it to q = p, ...*q..., q = q+size.
|
Then fall into the usual case. */
|
Then fall into the usual case. */
|
rtx insns, temp;
|
rtx insns, temp;
|
|
|
start_sequence ();
|
start_sequence ();
|
emit_move_insn (q, incr_reg);
|
emit_move_insn (q, incr_reg);
|
insns = get_insns ();
|
insns = get_insns ();
|
end_sequence ();
|
end_sequence ();
|
|
|
/* If we can't make the auto-inc, or can't make the
|
/* If we can't make the auto-inc, or can't make the
|
replacement into Y, exit. There's no point in making
|
replacement into Y, exit. There's no point in making
|
the change below if we can't do the auto-inc and doing
|
the change below if we can't do the auto-inc and doing
|
so is not correct in the pre-inc case. */
|
so is not correct in the pre-inc case. */
|
|
|
XEXP (inc, 0) = q;
|
XEXP (inc, 0) = q;
|
validate_change (insn, &XEXP (mem, 0), inc, 1);
|
validate_change (insn, &XEXP (mem, 0), inc, 1);
|
validate_change (incr, &XEXP (y, opnum), q, 1);
|
validate_change (incr, &XEXP (y, opnum), q, 1);
|
if (! apply_change_group ())
|
if (! apply_change_group ())
|
return;
|
return;
|
|
|
/* We now know we'll be doing this change, so emit the
|
/* We now know we'll be doing this change, so emit the
|
new insn(s) and do the updates. */
|
new insn(s) and do the updates. */
|
emit_insn_before (insns, insn);
|
emit_insn_before (insns, insn);
|
|
|
if (BB_HEAD (pbi->bb) == insn)
|
if (BB_HEAD (pbi->bb) == insn)
|
BB_HEAD (pbi->bb) = insns;
|
BB_HEAD (pbi->bb) = insns;
|
|
|
/* INCR will become a NOTE and INSN won't contain a
|
/* INCR will become a NOTE and INSN won't contain a
|
use of INCR_REG. If a use of INCR_REG was just placed in
|
use of INCR_REG. If a use of INCR_REG was just placed in
|
the insn before INSN, make that the next use.
|
the insn before INSN, make that the next use.
|
Otherwise, invalidate it. */
|
Otherwise, invalidate it. */
|
if (NONJUMP_INSN_P (PREV_INSN (insn))
|
if (NONJUMP_INSN_P (PREV_INSN (insn))
|
&& GET_CODE (PATTERN (PREV_INSN (insn))) == SET
|
&& GET_CODE (PATTERN (PREV_INSN (insn))) == SET
|
&& SET_SRC (PATTERN (PREV_INSN (insn))) == incr_reg)
|
&& SET_SRC (PATTERN (PREV_INSN (insn))) == incr_reg)
|
pbi->reg_next_use[regno] = PREV_INSN (insn);
|
pbi->reg_next_use[regno] = PREV_INSN (insn);
|
else
|
else
|
pbi->reg_next_use[regno] = 0;
|
pbi->reg_next_use[regno] = 0;
|
|
|
incr_reg = q;
|
incr_reg = q;
|
regno = REGNO (q);
|
regno = REGNO (q);
|
|
|
if ((pbi->flags & PROP_REG_INFO)
|
if ((pbi->flags & PROP_REG_INFO)
|
&& !REGNO_REG_SET_P (pbi->reg_live, regno))
|
&& !REGNO_REG_SET_P (pbi->reg_live, regno))
|
reg_deaths[regno] = pbi->insn_num;
|
reg_deaths[regno] = pbi->insn_num;
|
|
|
/* REGNO is now used in INCR which is below INSN, but
|
/* REGNO is now used in INCR which is below INSN, but
|
it previously wasn't live here. If we don't mark
|
it previously wasn't live here. If we don't mark
|
it as live, we'll put a REG_DEAD note for it
|
it as live, we'll put a REG_DEAD note for it
|
on this insn, which is incorrect. */
|
on this insn, which is incorrect. */
|
SET_REGNO_REG_SET (pbi->reg_live, regno);
|
SET_REGNO_REG_SET (pbi->reg_live, regno);
|
|
|
/* If there are any calls between INSN and INCR, show
|
/* If there are any calls between INSN and INCR, show
|
that REGNO now crosses them. */
|
that REGNO now crosses them. */
|
for (temp = insn; temp != incr; temp = NEXT_INSN (temp))
|
for (temp = insn; temp != incr; temp = NEXT_INSN (temp))
|
if (CALL_P (temp))
|
if (CALL_P (temp))
|
{
|
{
|
REG_N_CALLS_CROSSED (regno)++;
|
REG_N_CALLS_CROSSED (regno)++;
|
if (can_throw_internal (temp))
|
if (can_throw_internal (temp))
|
REG_N_THROWING_CALLS_CROSSED (regno)++;
|
REG_N_THROWING_CALLS_CROSSED (regno)++;
|
}
|
}
|
|
|
/* Invalidate alias info for Q since we just changed its value. */
|
/* Invalidate alias info for Q since we just changed its value. */
|
clear_reg_alias_info (q);
|
clear_reg_alias_info (q);
|
}
|
}
|
else
|
else
|
return;
|
return;
|
|
|
/* If we haven't returned, it means we were able to make the
|
/* If we haven't returned, it means we were able to make the
|
auto-inc, so update the status. First, record that this insn
|
auto-inc, so update the status. First, record that this insn
|
has an implicit side effect. */
|
has an implicit side effect. */
|
|
|
REG_NOTES (insn) = alloc_EXPR_LIST (REG_INC, incr_reg, REG_NOTES (insn));
|
REG_NOTES (insn) = alloc_EXPR_LIST (REG_INC, incr_reg, REG_NOTES (insn));
|
|
|
/* Modify the old increment-insn to simply copy
|
/* Modify the old increment-insn to simply copy
|
the already-incremented value of our register. */
|
the already-incremented value of our register. */
|
changed = validate_change (incr, &SET_SRC (set), incr_reg, 0);
|
changed = validate_change (incr, &SET_SRC (set), incr_reg, 0);
|
gcc_assert (changed);
|
gcc_assert (changed);
|
|
|
/* If that makes it a no-op (copying the register into itself) delete
|
/* If that makes it a no-op (copying the register into itself) delete
|
it so it won't appear to be a "use" and a "set" of this
|
it so it won't appear to be a "use" and a "set" of this
|
register. */
|
register. */
|
if (REGNO (SET_DEST (set)) == REGNO (incr_reg))
|
if (REGNO (SET_DEST (set)) == REGNO (incr_reg))
|
{
|
{
|
/* If the original source was dead, it's dead now. */
|
/* If the original source was dead, it's dead now. */
|
rtx note;
|
rtx note;
|
|
|
while ((note = find_reg_note (incr, REG_DEAD, NULL_RTX)) != NULL_RTX)
|
while ((note = find_reg_note (incr, REG_DEAD, NULL_RTX)) != NULL_RTX)
|
{
|
{
|
remove_note (incr, note);
|
remove_note (incr, note);
|
if (XEXP (note, 0) != incr_reg)
|
if (XEXP (note, 0) != incr_reg)
|
{
|
{
|
unsigned int regno = REGNO (XEXP (note, 0));
|
unsigned int regno = REGNO (XEXP (note, 0));
|
|
|
if ((pbi->flags & PROP_REG_INFO)
|
if ((pbi->flags & PROP_REG_INFO)
|
&& REGNO_REG_SET_P (pbi->reg_live, regno))
|
&& REGNO_REG_SET_P (pbi->reg_live, regno))
|
{
|
{
|
REG_LIVE_LENGTH (regno) += pbi->insn_num - reg_deaths[regno];
|
REG_LIVE_LENGTH (regno) += pbi->insn_num - reg_deaths[regno];
|
reg_deaths[regno] = 0;
|
reg_deaths[regno] = 0;
|
}
|
}
|
CLEAR_REGNO_REG_SET (pbi->reg_live, REGNO (XEXP (note, 0)));
|
CLEAR_REGNO_REG_SET (pbi->reg_live, REGNO (XEXP (note, 0)));
|
}
|
}
|
}
|
}
|
|
|
SET_INSN_DELETED (incr);
|
SET_INSN_DELETED (incr);
|
}
|
}
|
|
|
if (regno >= FIRST_PSEUDO_REGISTER)
|
if (regno >= FIRST_PSEUDO_REGISTER)
|
{
|
{
|
/* Count an extra reference to the reg. When a reg is
|
/* Count an extra reference to the reg. When a reg is
|
incremented, spilling it is worse, so we want to make
|
incremented, spilling it is worse, so we want to make
|
that less likely. */
|
that less likely. */
|
REG_FREQ (regno) += REG_FREQ_FROM_BB (pbi->bb);
|
REG_FREQ (regno) += REG_FREQ_FROM_BB (pbi->bb);
|
|
|
/* Count the increment as a setting of the register,
|
/* Count the increment as a setting of the register,
|
even though it isn't a SET in rtl. */
|
even though it isn't a SET in rtl. */
|
REG_N_SETS (regno)++;
|
REG_N_SETS (regno)++;
|
}
|
}
|
}
|
}
|
|
|
/* X is a MEM found in INSN. See if we can convert it into an auto-increment
|
/* X is a MEM found in INSN. See if we can convert it into an auto-increment
|
reference. */
|
reference. */
|
|
|
static void
|
static void
|
find_auto_inc (struct propagate_block_info *pbi, rtx x, rtx insn)
|
find_auto_inc (struct propagate_block_info *pbi, rtx x, rtx insn)
|
{
|
{
|
rtx addr = XEXP (x, 0);
|
rtx addr = XEXP (x, 0);
|
HOST_WIDE_INT offset = 0;
|
HOST_WIDE_INT offset = 0;
|
rtx set, y, incr, inc_val;
|
rtx set, y, incr, inc_val;
|
int regno;
|
int regno;
|
int size = GET_MODE_SIZE (GET_MODE (x));
|
int size = GET_MODE_SIZE (GET_MODE (x));
|
|
|
if (JUMP_P (insn))
|
if (JUMP_P (insn))
|
return;
|
return;
|
|
|
/* Here we detect use of an index register which might be good for
|
/* Here we detect use of an index register which might be good for
|
postincrement, postdecrement, preincrement, or predecrement. */
|
postincrement, postdecrement, preincrement, or predecrement. */
|
|
|
if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT)
|
if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT)
|
offset = INTVAL (XEXP (addr, 1)), addr = XEXP (addr, 0);
|
offset = INTVAL (XEXP (addr, 1)), addr = XEXP (addr, 0);
|
|
|
if (!REG_P (addr))
|
if (!REG_P (addr))
|
return;
|
return;
|
|
|
regno = REGNO (addr);
|
regno = REGNO (addr);
|
|
|
/* Is the next use an increment that might make auto-increment? */
|
/* Is the next use an increment that might make auto-increment? */
|
incr = pbi->reg_next_use[regno];
|
incr = pbi->reg_next_use[regno];
|
if (incr == 0 || BLOCK_NUM (incr) != BLOCK_NUM (insn))
|
if (incr == 0 || BLOCK_NUM (incr) != BLOCK_NUM (insn))
|
return;
|
return;
|
set = single_set (incr);
|
set = single_set (incr);
|
if (set == 0 || GET_CODE (set) != SET)
|
if (set == 0 || GET_CODE (set) != SET)
|
return;
|
return;
|
y = SET_SRC (set);
|
y = SET_SRC (set);
|
|
|
if (GET_CODE (y) != PLUS)
|
if (GET_CODE (y) != PLUS)
|
return;
|
return;
|
|
|
if (REG_P (XEXP (y, 0)) && REGNO (XEXP (y, 0)) == REGNO (addr))
|
if (REG_P (XEXP (y, 0)) && REGNO (XEXP (y, 0)) == REGNO (addr))
|
inc_val = XEXP (y, 1);
|
inc_val = XEXP (y, 1);
|
else if (REG_P (XEXP (y, 1)) && REGNO (XEXP (y, 1)) == REGNO (addr))
|
else if (REG_P (XEXP (y, 1)) && REGNO (XEXP (y, 1)) == REGNO (addr))
|
inc_val = XEXP (y, 0);
|
inc_val = XEXP (y, 0);
|
else
|
else
|
return;
|
return;
|
|
|
if (GET_CODE (inc_val) == CONST_INT)
|
if (GET_CODE (inc_val) == CONST_INT)
|
{
|
{
|
if (HAVE_POST_INCREMENT
|
if (HAVE_POST_INCREMENT
|
&& (INTVAL (inc_val) == size && offset == 0))
|
&& (INTVAL (inc_val) == size && offset == 0))
|
attempt_auto_inc (pbi, gen_rtx_POST_INC (Pmode, addr), insn, x,
|
attempt_auto_inc (pbi, gen_rtx_POST_INC (Pmode, addr), insn, x,
|
incr, addr);
|
incr, addr);
|
else if (HAVE_POST_DECREMENT
|
else if (HAVE_POST_DECREMENT
|
&& (INTVAL (inc_val) == -size && offset == 0))
|
&& (INTVAL (inc_val) == -size && offset == 0))
|
attempt_auto_inc (pbi, gen_rtx_POST_DEC (Pmode, addr), insn, x,
|
attempt_auto_inc (pbi, gen_rtx_POST_DEC (Pmode, addr), insn, x,
|
incr, addr);
|
incr, addr);
|
else if (HAVE_PRE_INCREMENT
|
else if (HAVE_PRE_INCREMENT
|
&& (INTVAL (inc_val) == size && offset == size))
|
&& (INTVAL (inc_val) == size && offset == size))
|
attempt_auto_inc (pbi, gen_rtx_PRE_INC (Pmode, addr), insn, x,
|
attempt_auto_inc (pbi, gen_rtx_PRE_INC (Pmode, addr), insn, x,
|
incr, addr);
|
incr, addr);
|
else if (HAVE_PRE_DECREMENT
|
else if (HAVE_PRE_DECREMENT
|
&& (INTVAL (inc_val) == -size && offset == -size))
|
&& (INTVAL (inc_val) == -size && offset == -size))
|
attempt_auto_inc (pbi, gen_rtx_PRE_DEC (Pmode, addr), insn, x,
|
attempt_auto_inc (pbi, gen_rtx_PRE_DEC (Pmode, addr), insn, x,
|
incr, addr);
|
incr, addr);
|
else if (HAVE_POST_MODIFY_DISP && offset == 0)
|
else if (HAVE_POST_MODIFY_DISP && offset == 0)
|
attempt_auto_inc (pbi, gen_rtx_POST_MODIFY (Pmode, addr,
|
attempt_auto_inc (pbi, gen_rtx_POST_MODIFY (Pmode, addr,
|
gen_rtx_PLUS (Pmode,
|
gen_rtx_PLUS (Pmode,
|
addr,
|
addr,
|
inc_val)),
|
inc_val)),
|
insn, x, incr, addr);
|
insn, x, incr, addr);
|
else if (HAVE_PRE_MODIFY_DISP && offset == INTVAL (inc_val))
|
else if (HAVE_PRE_MODIFY_DISP && offset == INTVAL (inc_val))
|
attempt_auto_inc (pbi, gen_rtx_PRE_MODIFY (Pmode, addr,
|
attempt_auto_inc (pbi, gen_rtx_PRE_MODIFY (Pmode, addr,
|
gen_rtx_PLUS (Pmode,
|
gen_rtx_PLUS (Pmode,
|
addr,
|
addr,
|
inc_val)),
|
inc_val)),
|
insn, x, incr, addr);
|
insn, x, incr, addr);
|
}
|
}
|
else if (REG_P (inc_val)
|
else if (REG_P (inc_val)
|
&& ! reg_set_between_p (inc_val, PREV_INSN (insn),
|
&& ! reg_set_between_p (inc_val, PREV_INSN (insn),
|
NEXT_INSN (incr)))
|
NEXT_INSN (incr)))
|
|
|
{
|
{
|
if (HAVE_POST_MODIFY_REG && offset == 0)
|
if (HAVE_POST_MODIFY_REG && offset == 0)
|
attempt_auto_inc (pbi, gen_rtx_POST_MODIFY (Pmode, addr,
|
attempt_auto_inc (pbi, gen_rtx_POST_MODIFY (Pmode, addr,
|
gen_rtx_PLUS (Pmode,
|
gen_rtx_PLUS (Pmode,
|
addr,
|
addr,
|
inc_val)),
|
inc_val)),
|
insn, x, incr, addr);
|
insn, x, incr, addr);
|
}
|
}
|
}
|
}
|
|
|
#endif /* AUTO_INC_DEC */
|
#endif /* AUTO_INC_DEC */
|
|
|
static void
|
static void
|
mark_used_reg (struct propagate_block_info *pbi, rtx reg,
|
mark_used_reg (struct propagate_block_info *pbi, rtx reg,
|
rtx cond ATTRIBUTE_UNUSED, rtx insn)
|
rtx cond ATTRIBUTE_UNUSED, rtx insn)
|
{
|
{
|
unsigned int regno_first, regno_last, i;
|
unsigned int regno_first, regno_last, i;
|
int some_was_live, some_was_dead, some_not_set;
|
int some_was_live, some_was_dead, some_not_set;
|
|
|
regno_last = regno_first = REGNO (reg);
|
regno_last = regno_first = REGNO (reg);
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
regno_last += hard_regno_nregs[regno_first][GET_MODE (reg)] - 1;
|
regno_last += hard_regno_nregs[regno_first][GET_MODE (reg)] - 1;
|
|
|
/* Find out if any of this register is live after this instruction. */
|
/* Find out if any of this register is live after this instruction. */
|
some_was_live = some_was_dead = 0;
|
some_was_live = some_was_dead = 0;
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
{
|
{
|
int needed_regno = REGNO_REG_SET_P (pbi->reg_live, i);
|
int needed_regno = REGNO_REG_SET_P (pbi->reg_live, i);
|
some_was_live |= needed_regno;
|
some_was_live |= needed_regno;
|
some_was_dead |= ! needed_regno;
|
some_was_dead |= ! needed_regno;
|
}
|
}
|
|
|
/* Find out if any of the register was set this insn. */
|
/* Find out if any of the register was set this insn. */
|
some_not_set = 0;
|
some_not_set = 0;
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
some_not_set |= ! REGNO_REG_SET_P (pbi->new_set, i);
|
some_not_set |= ! REGNO_REG_SET_P (pbi->new_set, i);
|
|
|
if (pbi->flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
if (pbi->flags & (PROP_LOG_LINKS | PROP_AUTOINC))
|
{
|
{
|
/* Record where each reg is used, so when the reg is set we know
|
/* Record where each reg is used, so when the reg is set we know
|
the next insn that uses it. */
|
the next insn that uses it. */
|
pbi->reg_next_use[regno_first] = insn;
|
pbi->reg_next_use[regno_first] = insn;
|
}
|
}
|
|
|
if (pbi->flags & PROP_REG_INFO)
|
if (pbi->flags & PROP_REG_INFO)
|
{
|
{
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
if (regno_first < FIRST_PSEUDO_REGISTER)
|
{
|
{
|
/* If this is a register we are going to try to eliminate,
|
/* If this is a register we are going to try to eliminate,
|
don't mark it live here. If we are successful in
|
don't mark it live here. If we are successful in
|
eliminating it, it need not be live unless it is used for
|
eliminating it, it need not be live unless it is used for
|
pseudos, in which case it will have been set live when it
|
pseudos, in which case it will have been set live when it
|
was allocated to the pseudos. If the register will not
|
was allocated to the pseudos. If the register will not
|
be eliminated, reload will set it live at that point.
|
be eliminated, reload will set it live at that point.
|
|
|
Otherwise, record that this function uses this register. */
|
Otherwise, record that this function uses this register. */
|
/* ??? The PPC backend tries to "eliminate" on the pic
|
/* ??? The PPC backend tries to "eliminate" on the pic
|
register to itself. This should be fixed. In the mean
|
register to itself. This should be fixed. In the mean
|
time, hack around it. */
|
time, hack around it. */
|
|
|
if (! (TEST_HARD_REG_BIT (elim_reg_set, regno_first)
|
if (! (TEST_HARD_REG_BIT (elim_reg_set, regno_first)
|
&& (regno_first == FRAME_POINTER_REGNUM
|
&& (regno_first == FRAME_POINTER_REGNUM
|
|| regno_first == ARG_POINTER_REGNUM)))
|
|| regno_first == ARG_POINTER_REGNUM)))
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
regs_ever_live[i] = 1;
|
regs_ever_live[i] = 1;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Keep track of which basic block each reg appears in. */
|
/* Keep track of which basic block each reg appears in. */
|
|
|
int blocknum = pbi->bb->index;
|
int blocknum = pbi->bb->index;
|
if (REG_BASIC_BLOCK (regno_first) == REG_BLOCK_UNKNOWN)
|
if (REG_BASIC_BLOCK (regno_first) == REG_BLOCK_UNKNOWN)
|
REG_BASIC_BLOCK (regno_first) = blocknum;
|
REG_BASIC_BLOCK (regno_first) = blocknum;
|
else if (REG_BASIC_BLOCK (regno_first) != blocknum)
|
else if (REG_BASIC_BLOCK (regno_first) != blocknum)
|
REG_BASIC_BLOCK (regno_first) = REG_BLOCK_GLOBAL;
|
REG_BASIC_BLOCK (regno_first) = REG_BLOCK_GLOBAL;
|
|
|
/* Count (weighted) number of uses of each reg. */
|
/* Count (weighted) number of uses of each reg. */
|
REG_FREQ (regno_first) += REG_FREQ_FROM_BB (pbi->bb);
|
REG_FREQ (regno_first) += REG_FREQ_FROM_BB (pbi->bb);
|
REG_N_REFS (regno_first)++;
|
REG_N_REFS (regno_first)++;
|
}
|
}
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
if (! REGNO_REG_SET_P (pbi->reg_live, i))
|
if (! REGNO_REG_SET_P (pbi->reg_live, i))
|
{
|
{
|
gcc_assert (!reg_deaths[i]);
|
gcc_assert (!reg_deaths[i]);
|
reg_deaths[i] = pbi->insn_num;
|
reg_deaths[i] = pbi->insn_num;
|
}
|
}
|
}
|
}
|
|
|
/* Record and count the insns in which a reg dies. If it is used in
|
/* Record and count the insns in which a reg dies. If it is used in
|
this insn and was dead below the insn then it dies in this insn.
|
this insn and was dead below the insn then it dies in this insn.
|
If it was set in this insn, we do not make a REG_DEAD note;
|
If it was set in this insn, we do not make a REG_DEAD note;
|
likewise if we already made such a note. */
|
likewise if we already made such a note. */
|
if ((pbi->flags & (PROP_DEATH_NOTES | PROP_REG_INFO))
|
if ((pbi->flags & (PROP_DEATH_NOTES | PROP_REG_INFO))
|
&& some_was_dead
|
&& some_was_dead
|
&& some_not_set)
|
&& some_not_set)
|
{
|
{
|
/* Check for the case where the register dying partially
|
/* Check for the case where the register dying partially
|
overlaps the register set by this insn. */
|
overlaps the register set by this insn. */
|
if (regno_first != regno_last)
|
if (regno_first != regno_last)
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
some_was_live |= REGNO_REG_SET_P (pbi->new_set, i);
|
some_was_live |= REGNO_REG_SET_P (pbi->new_set, i);
|
|
|
/* If none of the words in X is needed, make a REG_DEAD note.
|
/* If none of the words in X is needed, make a REG_DEAD note.
|
Otherwise, we must make partial REG_DEAD notes. */
|
Otherwise, we must make partial REG_DEAD notes. */
|
if (! some_was_live)
|
if (! some_was_live)
|
{
|
{
|
if ((pbi->flags & PROP_DEATH_NOTES)
|
if ((pbi->flags & PROP_DEATH_NOTES)
|
#ifdef STACK_REGS
|
#ifdef STACK_REGS
|
&& (!(pbi->flags & PROP_POST_REGSTACK)
|
&& (!(pbi->flags & PROP_POST_REGSTACK)
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG, LAST_STACK_REG))
|
|| !IN_RANGE (REGNO (reg), FIRST_STACK_REG, LAST_STACK_REG))
|
#endif
|
#endif
|
&& ! find_regno_note (insn, REG_DEAD, regno_first))
|
&& ! find_regno_note (insn, REG_DEAD, regno_first))
|
REG_NOTES (insn)
|
REG_NOTES (insn)
|
= alloc_EXPR_LIST (REG_DEAD, reg, REG_NOTES (insn));
|
= alloc_EXPR_LIST (REG_DEAD, reg, REG_NOTES (insn));
|
|
|
if (pbi->flags & PROP_REG_INFO)
|
if (pbi->flags & PROP_REG_INFO)
|
REG_N_DEATHS (regno_first)++;
|
REG_N_DEATHS (regno_first)++;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Don't make a REG_DEAD note for a part of a register
|
/* Don't make a REG_DEAD note for a part of a register
|
that is set in the insn. */
|
that is set in the insn. */
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
if (! REGNO_REG_SET_P (pbi->reg_live, i)
|
if (! REGNO_REG_SET_P (pbi->reg_live, i)
|
&& ! dead_or_set_regno_p (insn, i))
|
&& ! dead_or_set_regno_p (insn, i))
|
REG_NOTES (insn)
|
REG_NOTES (insn)
|
= alloc_EXPR_LIST (REG_DEAD,
|
= alloc_EXPR_LIST (REG_DEAD,
|
regno_reg_rtx[i],
|
regno_reg_rtx[i],
|
REG_NOTES (insn));
|
REG_NOTES (insn));
|
}
|
}
|
}
|
}
|
|
|
/* Mark the register as being live. */
|
/* Mark the register as being live. */
|
for (i = regno_first; i <= regno_last; ++i)
|
for (i = regno_first; i <= regno_last; ++i)
|
{
|
{
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
int this_was_live = REGNO_REG_SET_P (pbi->reg_live, i);
|
int this_was_live = REGNO_REG_SET_P (pbi->reg_live, i);
|
#endif
|
#endif
|
|
|
SET_REGNO_REG_SET (pbi->reg_live, i);
|
SET_REGNO_REG_SET (pbi->reg_live, i);
|
|
|
#ifdef HAVE_conditional_execution
|
#ifdef HAVE_conditional_execution
|
/* If this is a conditional use, record that fact. If it is later
|
/* If this is a conditional use, record that fact. If it is later
|
conditionally set, we'll know to kill the register. */
|
conditionally set, we'll know to kill the register. */
|
if (cond != NULL_RTX)
|
if (cond != NULL_RTX)
|
{
|
{
|
splay_tree_node node;
|
splay_tree_node node;
|
struct reg_cond_life_info *rcli;
|
struct reg_cond_life_info *rcli;
|
rtx ncond;
|
rtx ncond;
|
|
|
if (this_was_live)
|
if (this_was_live)
|
{
|
{
|
node = splay_tree_lookup (pbi->reg_cond_dead, i);
|
node = splay_tree_lookup (pbi->reg_cond_dead, i);
|
if (node == NULL)
|
if (node == NULL)
|
{
|
{
|
/* The register was unconditionally live previously.
|
/* The register was unconditionally live previously.
|
No need to do anything. */
|
No need to do anything. */
|
}
|
}
|
else
|
else
|
{
|
{
|
/* The register was conditionally live previously.
|
/* The register was conditionally live previously.
|
Subtract the new life cond from the old death cond. */
|
Subtract the new life cond from the old death cond. */
|
rcli = (struct reg_cond_life_info *) node->value;
|
rcli = (struct reg_cond_life_info *) node->value;
|
ncond = rcli->condition;
|
ncond = rcli->condition;
|
ncond = and_reg_cond (ncond, not_reg_cond (cond), 1);
|
ncond = and_reg_cond (ncond, not_reg_cond (cond), 1);
|
|
|
/* If the register is now unconditionally live,
|
/* If the register is now unconditionally live,
|
remove the entry in the splay_tree. */
|
remove the entry in the splay_tree. */
|
if (ncond == const0_rtx)
|
if (ncond == const0_rtx)
|
splay_tree_remove (pbi->reg_cond_dead, i);
|
splay_tree_remove (pbi->reg_cond_dead, i);
|
else
|
else
|
{
|
{
|
rcli->condition = ncond;
|
rcli->condition = ncond;
|
SET_REGNO_REG_SET (pbi->reg_cond_reg,
|
SET_REGNO_REG_SET (pbi->reg_cond_reg,
|
REGNO (XEXP (cond, 0)));
|
REGNO (XEXP (cond, 0)));
|
}
|
}
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
/* The register was not previously live at all. Record
|
/* The register was not previously live at all. Record
|
the condition under which it is still dead. */
|
the condition under which it is still dead. */
|
rcli = XNEW (struct reg_cond_life_info);
|
rcli = XNEW (struct reg_cond_life_info);
|
rcli->condition = not_reg_cond (cond);
|
rcli->condition = not_reg_cond (cond);
|
rcli->stores = const0_rtx;
|
rcli->stores = const0_rtx;
|
rcli->orig_condition = const0_rtx;
|
rcli->orig_condition = const0_rtx;
|
splay_tree_insert (pbi->reg_cond_dead, i,
|
splay_tree_insert (pbi->reg_cond_dead, i,
|
(splay_tree_value) rcli);
|
(splay_tree_value) rcli);
|
|
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (XEXP (cond, 0)));
|
SET_REGNO_REG_SET (pbi->reg_cond_reg, REGNO (XEXP (cond, 0)));
|
}
|
}
|
}
|
}
|
else if (this_was_live)
|
else if (this_was_live)
|
{
|
{
|
/* The register may have been conditionally live previously, but
|
/* The register may have been conditionally live previously, but
|
is now unconditionally live. Remove it from the conditionally
|
is now unconditionally live. Remove it from the conditionally
|
dead list, so that a conditional set won't cause us to think
|
dead list, so that a conditional set won't cause us to think
|
it dead. */
|
it dead. */
|
splay_tree_remove (pbi->reg_cond_dead, i);
|
splay_tree_remove (pbi->reg_cond_dead, i);
|
}
|
}
|
#endif
|
#endif
|
}
|
}
|
}
|
}
|
|
|
/* Scan expression X for registers which have to be marked used in PBI.
|
/* Scan expression X for registers which have to be marked used in PBI.
|
X is considered to be the SET_DEST rtx of SET. TRUE is returned if
|
X is considered to be the SET_DEST rtx of SET. TRUE is returned if
|
X could be handled by this function. */
|
X could be handled by this function. */
|
|
|
static bool
|
static bool
|
mark_used_dest_regs (struct propagate_block_info *pbi, rtx x, rtx cond, rtx insn)
|
mark_used_dest_regs (struct propagate_block_info *pbi, rtx x, rtx cond, rtx insn)
|
{
|
{
|
int regno;
|
int regno;
|
bool mark_dest = false;
|
bool mark_dest = false;
|
rtx dest = x;
|
rtx dest = x;
|
|
|
/* On some platforms calls return values spread over several
|
/* On some platforms calls return values spread over several
|
locations. These locations are wrapped in a EXPR_LIST rtx
|
locations. These locations are wrapped in a EXPR_LIST rtx
|
together with a CONST_INT offset. */
|
together with a CONST_INT offset. */
|
if (GET_CODE (x) == EXPR_LIST
|
if (GET_CODE (x) == EXPR_LIST
|
&& GET_CODE (XEXP (x, 1)) == CONST_INT)
|
&& GET_CODE (XEXP (x, 1)) == CONST_INT)
|
x = XEXP (x, 0);
|
x = XEXP (x, 0);
|
|
|
if (x == NULL_RTX)
|
if (x == NULL_RTX)
|
return false;
|
return false;
|
|
|
/* If storing into MEM, don't show it as being used. But do
|
/* If storing into MEM, don't show it as being used. But do
|
show the address as being used. */
|
show the address as being used. */
|
if (MEM_P (x))
|
if (MEM_P (x))
|
{
|
{
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
if (pbi->flags & PROP_AUTOINC)
|
if (pbi->flags & PROP_AUTOINC)
|
find_auto_inc (pbi, x, insn);
|
find_auto_inc (pbi, x, insn);
|
#endif
|
#endif
|
mark_used_regs (pbi, XEXP (x, 0), cond, insn);
|
mark_used_regs (pbi, XEXP (x, 0), cond, insn);
|
return true;
|
return true;
|
}
|
}
|
|
|
/* Storing in STRICT_LOW_PART is like storing in a reg
|
/* Storing in STRICT_LOW_PART is like storing in a reg
|
in that this SET might be dead, so ignore it in TESTREG.
|
in that this SET might be dead, so ignore it in TESTREG.
|
but in some other ways it is like using the reg.
|
but in some other ways it is like using the reg.
|
|
|
Storing in a SUBREG or a bit field is like storing the entire
|
Storing in a SUBREG or a bit field is like storing the entire
|
register in that if the register's value is not used
|
register in that if the register's value is not used
|
then this SET is not needed. */
|
then this SET is not needed. */
|
while (GET_CODE (x) == STRICT_LOW_PART
|
while (GET_CODE (x) == STRICT_LOW_PART
|
|| GET_CODE (x) == ZERO_EXTRACT
|
|| GET_CODE (x) == ZERO_EXTRACT
|
|| GET_CODE (x) == SUBREG)
|
|| GET_CODE (x) == SUBREG)
|
{
|
{
|
#ifdef CANNOT_CHANGE_MODE_CLASS
|
#ifdef CANNOT_CHANGE_MODE_CLASS
|
if ((pbi->flags & PROP_REG_INFO) && GET_CODE (x) == SUBREG)
|
if ((pbi->flags & PROP_REG_INFO) && GET_CODE (x) == SUBREG)
|
record_subregs_of_mode (x);
|
record_subregs_of_mode (x);
|
#endif
|
#endif
|
|
|
/* Modifying a single register in an alternate mode
|
/* Modifying a single register in an alternate mode
|
does not use any of the old value. But these other
|
does not use any of the old value. But these other
|
ways of storing in a register do use the old value. */
|
ways of storing in a register do use the old value. */
|
if (GET_CODE (x) == SUBREG
|
if (GET_CODE (x) == SUBREG
|
&& !((REG_BYTES (SUBREG_REG (x))
|
&& !((REG_BYTES (SUBREG_REG (x))
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD
|
> (REG_BYTES (x)
|
> (REG_BYTES (x)
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD))
|
+ UNITS_PER_WORD - 1) / UNITS_PER_WORD))
|
;
|
;
|
else
|
else
|
mark_dest = true;
|
mark_dest = true;
|
|
|
x = XEXP (x, 0);
|
x = XEXP (x, 0);
|
}
|
}
|
|
|
/* If this is a store into a register or group of registers,
|
/* If this is a store into a register or group of registers,
|
recursively scan the value being stored. */
|
recursively scan the value being stored. */
|
if (REG_P (x)
|
if (REG_P (x)
|
&& (regno = REGNO (x),
|
&& (regno = REGNO (x),
|
!(regno == FRAME_POINTER_REGNUM
|
!(regno == FRAME_POINTER_REGNUM
|
&& (!reload_completed || frame_pointer_needed)))
|
&& (!reload_completed || frame_pointer_needed)))
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
|
&& !(regno == HARD_FRAME_POINTER_REGNUM
|
&& !(regno == HARD_FRAME_POINTER_REGNUM
|
&& (!reload_completed || frame_pointer_needed))
|
&& (!reload_completed || frame_pointer_needed))
|
#endif
|
#endif
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
|
&& !(regno == ARG_POINTER_REGNUM && fixed_regs[regno])
|
&& !(regno == ARG_POINTER_REGNUM && fixed_regs[regno])
|
#endif
|
#endif
|
)
|
)
|
{
|
{
|
if (mark_dest)
|
if (mark_dest)
|
mark_used_regs (pbi, dest, cond, insn);
|
mark_used_regs (pbi, dest, cond, insn);
|
return true;
|
return true;
|
}
|
}
|
return false;
|
return false;
|
}
|
}
|
|
|
/* Scan expression X and store a 1-bit in NEW_LIVE for each reg it uses.
|
/* Scan expression X and store a 1-bit in NEW_LIVE for each reg it uses.
|
This is done assuming the registers needed from X are those that
|
This is done assuming the registers needed from X are those that
|
have 1-bits in PBI->REG_LIVE.
|
have 1-bits in PBI->REG_LIVE.
|
|
|
INSN is the containing instruction. If INSN is dead, this function
|
INSN is the containing instruction. If INSN is dead, this function
|
is not called. */
|
is not called. */
|
|
|
static void
|
static void
|
mark_used_regs (struct propagate_block_info *pbi, rtx x, rtx cond, rtx insn)
|
mark_used_regs (struct propagate_block_info *pbi, rtx x, rtx cond, rtx insn)
|
{
|
{
|
RTX_CODE code;
|
RTX_CODE code;
|
int flags = pbi->flags;
|
int flags = pbi->flags;
|
|
|
retry:
|
retry:
|
if (!x)
|
if (!x)
|
return;
|
return;
|
code = GET_CODE (x);
|
code = GET_CODE (x);
|
switch (code)
|
switch (code)
|
{
|
{
|
case LABEL_REF:
|
case LABEL_REF:
|
case SYMBOL_REF:
|
case SYMBOL_REF:
|
case CONST_INT:
|
case CONST_INT:
|
case CONST:
|
case CONST:
|
case CONST_DOUBLE:
|
case CONST_DOUBLE:
|
case CONST_VECTOR:
|
case CONST_VECTOR:
|
case PC:
|
case PC:
|
case ADDR_VEC:
|
case ADDR_VEC:
|
case ADDR_DIFF_VEC:
|
case ADDR_DIFF_VEC:
|
return;
|
return;
|
|
|
#ifdef HAVE_cc0
|
#ifdef HAVE_cc0
|
case CC0:
|
case CC0:
|
pbi->cc0_live = 1;
|
pbi->cc0_live = 1;
|
return;
|
return;
|
#endif
|
#endif
|
|
|
case CLOBBER:
|
case CLOBBER:
|
/* If we are clobbering a MEM, mark any registers inside the address
|
/* If we are clobbering a MEM, mark any registers inside the address
|
as being used. */
|
as being used. */
|
if (MEM_P (XEXP (x, 0)))
|
if (MEM_P (XEXP (x, 0)))
|
mark_used_regs (pbi, XEXP (XEXP (x, 0), 0), cond, insn);
|
mark_used_regs (pbi, XEXP (XEXP (x, 0), 0), cond, insn);
|
return;
|
return;
|
|
|
case MEM:
|
case MEM:
|
/* Don't bother watching stores to mems if this is not the
|
/* Don't bother watching stores to mems if this is not the
|
final pass. We'll not be deleting dead stores this round. */
|
final pass. We'll not be deleting dead stores this round. */
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
if (optimize && (flags & PROP_SCAN_DEAD_STORES))
|
{
|
{
|
/* Invalidate the data for the last MEM stored, but only if MEM is
|
/* Invalidate the data for the last MEM stored, but only if MEM is
|
something that can be stored into. */
|
something that can be stored into. */
|
if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
|
if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
|
&& CONSTANT_POOL_ADDRESS_P (XEXP (x, 0)))
|
&& CONSTANT_POOL_ADDRESS_P (XEXP (x, 0)))
|
/* Needn't clear the memory set list. */
|
/* Needn't clear the memory set list. */
|
;
|
;
|
else
|
else
|
{
|
{
|
rtx temp = pbi->mem_set_list;
|
rtx temp = pbi->mem_set_list;
|
rtx prev = NULL_RTX;
|
rtx prev = NULL_RTX;
|
rtx next;
|
rtx next;
|
|
|
while (temp)
|
while (temp)
|
{
|
{
|
next = XEXP (temp, 1);
|
next = XEXP (temp, 1);
|
if (anti_dependence (XEXP (temp, 0), x))
|
if (anti_dependence (XEXP (temp, 0), x))
|
{
|
{
|
/* Splice temp out of the list. */
|
/* Splice temp out of the list. */
|
if (prev)
|
if (prev)
|
XEXP (prev, 1) = next;
|
XEXP (prev, 1) = next;
|
else
|
else
|
pbi->mem_set_list = next;
|
pbi->mem_set_list = next;
|
free_EXPR_LIST_node (temp);
|
free_EXPR_LIST_node (temp);
|
pbi->mem_set_list_len--;
|
pbi->mem_set_list_len--;
|
}
|
}
|
else
|
else
|
prev = temp;
|
prev = temp;
|
temp = next;
|
temp = next;
|
}
|
}
|
}
|
}
|
|
|
/* If the memory reference had embedded side effects (autoincrement
|
/* If the memory reference had embedded side effects (autoincrement
|
address modes. Then we may need to kill some entries on the
|
address modes. Then we may need to kill some entries on the
|
memory set list. */
|
memory set list. */
|
if (insn)
|
if (insn)
|
for_each_rtx (&PATTERN (insn), invalidate_mems_from_autoinc, pbi);
|
for_each_rtx (&PATTERN (insn), invalidate_mems_from_autoinc, pbi);
|
}
|
}
|
|
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
if (flags & PROP_AUTOINC)
|
if (flags & PROP_AUTOINC)
|
find_auto_inc (pbi, x, insn);
|
find_auto_inc (pbi, x, insn);
|
#endif
|
#endif
|
break;
|
break;
|
|
|
case SUBREG:
|
case SUBREG:
|
#ifdef CANNOT_CHANGE_MODE_CLASS
|
#ifdef CANNOT_CHANGE_MODE_CLASS
|
if (flags & PROP_REG_INFO)
|
if (flags & PROP_REG_INFO)
|
record_subregs_of_mode (x);
|
record_subregs_of_mode (x);
|
#endif
|
#endif
|
|
|
/* While we're here, optimize this case. */
|
/* While we're here, optimize this case. */
|
x = SUBREG_REG (x);
|
x = SUBREG_REG (x);
|
if (!REG_P (x))
|
if (!REG_P (x))
|
goto retry;
|
goto retry;
|
/* Fall through. */
|
/* Fall through. */
|
|
|
case REG:
|
case REG:
|
/* See a register other than being set => mark it as needed. */
|
/* See a register other than being set => mark it as needed. */
|
mark_used_reg (pbi, x, cond, insn);
|
mark_used_reg (pbi, x, cond, insn);
|
return;
|
return;
|
|
|
case SET:
|
case SET:
|
{
|
{
|
rtx dest = SET_DEST (x);
|
rtx dest = SET_DEST (x);
|
int i;
|
int i;
|
bool ret = false;
|
bool ret = false;
|
|
|
if (GET_CODE (dest) == PARALLEL)
|
if (GET_CODE (dest) == PARALLEL)
|
for (i = 0; i < XVECLEN (dest, 0); i++)
|
for (i = 0; i < XVECLEN (dest, 0); i++)
|
ret |= mark_used_dest_regs (pbi, XVECEXP (dest, 0, i), cond, insn);
|
ret |= mark_used_dest_regs (pbi, XVECEXP (dest, 0, i), cond, insn);
|
else
|
else
|
ret = mark_used_dest_regs (pbi, dest, cond, insn);
|
ret = mark_used_dest_regs (pbi, dest, cond, insn);
|
|
|
if (ret)
|
if (ret)
|
{
|
{
|
mark_used_regs (pbi, SET_SRC (x), cond, insn);
|
mark_used_regs (pbi, SET_SRC (x), cond, insn);
|
return;
|
return;
|
}
|
}
|
}
|
}
|
break;
|
break;
|
|
|
case ASM_OPERANDS:
|
case ASM_OPERANDS:
|
case UNSPEC_VOLATILE:
|
case UNSPEC_VOLATILE:
|
case TRAP_IF:
|
case TRAP_IF:
|
case ASM_INPUT:
|
case ASM_INPUT:
|
{
|
{
|
/* Traditional and volatile asm instructions must be considered to use
|
/* Traditional and volatile asm instructions must be considered to use
|
and clobber all hard registers, all pseudo-registers and all of
|
and clobber all hard registers, all pseudo-registers and all of
|
memory. So must TRAP_IF and UNSPEC_VOLATILE operations.
|
memory. So must TRAP_IF and UNSPEC_VOLATILE operations.
|
|
|
Consider for instance a volatile asm that changes the fpu rounding
|
Consider for instance a volatile asm that changes the fpu rounding
|
mode. An insn should not be moved across this even if it only uses
|
mode. An insn should not be moved across this even if it only uses
|
pseudo-regs because it might give an incorrectly rounded result.
|
pseudo-regs because it might give an incorrectly rounded result.
|
|
|
?!? Unfortunately, marking all hard registers as live causes massive
|
?!? Unfortunately, marking all hard registers as live causes massive
|
problems for the register allocator and marking all pseudos as live
|
problems for the register allocator and marking all pseudos as live
|
creates mountains of uninitialized variable warnings.
|
creates mountains of uninitialized variable warnings.
|
|
|
So for now, just clear the memory set list and mark any regs
|
So for now, just clear the memory set list and mark any regs
|
we can find in ASM_OPERANDS as used. */
|
we can find in ASM_OPERANDS as used. */
|
if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
|
if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
|
{
|
{
|
free_EXPR_LIST_list (&pbi->mem_set_list);
|
free_EXPR_LIST_list (&pbi->mem_set_list);
|
pbi->mem_set_list_len = 0;
|
pbi->mem_set_list_len = 0;
|
}
|
}
|
|
|
/* For all ASM_OPERANDS, we must traverse the vector of input operands.
|
/* For all ASM_OPERANDS, we must traverse the vector of input operands.
|
We can not just fall through here since then we would be confused
|
We can not just fall through here since then we would be confused
|
by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate
|
by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate
|
traditional asms unlike their normal usage. */
|
traditional asms unlike their normal usage. */
|
if (code == ASM_OPERANDS)
|
if (code == ASM_OPERANDS)
|
{
|
{
|
int j;
|
int j;
|
|
|
for (j = 0; j < ASM_OPERANDS_INPUT_LENGTH (x); j++)
|
for (j = 0; j < ASM_OPERANDS_INPUT_LENGTH (x); j++)
|
mark_used_regs (pbi, ASM_OPERANDS_INPUT (x, j), cond, insn);
|
mark_used_regs (pbi, ASM_OPERANDS_INPUT (x, j), cond, insn);
|
}
|
}
|
break;
|
break;
|
}
|
}
|
|
|
case COND_EXEC:
|
case COND_EXEC:
|
gcc_assert (!cond);
|
gcc_assert (!cond);
|
|
|
mark_used_regs (pbi, COND_EXEC_TEST (x), NULL_RTX, insn);
|
mark_used_regs (pbi, COND_EXEC_TEST (x), NULL_RTX, insn);
|
|
|
cond = COND_EXEC_TEST (x);
|
cond = COND_EXEC_TEST (x);
|
x = COND_EXEC_CODE (x);
|
x = COND_EXEC_CODE (x);
|
goto retry;
|
goto retry;
|
|
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
|
|
/* Recursively scan the operands of this expression. */
|
/* Recursively scan the operands of this expression. */
|
|
|
{
|
{
|
const char * const fmt = GET_RTX_FORMAT (code);
|
const char * const fmt = GET_RTX_FORMAT (code);
|
int i;
|
int i;
|
|
|
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
|
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
|
{
|
{
|
if (fmt[i] == 'e')
|
if (fmt[i] == 'e')
|
{
|
{
|
/* Tail recursive case: save a function call level. */
|
/* Tail recursive case: save a function call level. */
|
if (i == 0)
|
if (i == 0)
|
{
|
{
|
x = XEXP (x, 0);
|
x = XEXP (x, 0);
|
goto retry;
|
goto retry;
|
}
|
}
|
mark_used_regs (pbi, XEXP (x, i), cond, insn);
|
mark_used_regs (pbi, XEXP (x, i), cond, insn);
|
}
|
}
|
else if (fmt[i] == 'E')
|
else if (fmt[i] == 'E')
|
{
|
{
|
int j;
|
int j;
|
for (j = 0; j < XVECLEN (x, i); j++)
|
for (j = 0; j < XVECLEN (x, i); j++)
|
mark_used_regs (pbi, XVECEXP (x, i, j), cond, insn);
|
mark_used_regs (pbi, XVECEXP (x, i, j), cond, insn);
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
#ifdef AUTO_INC_DEC
|
#ifdef AUTO_INC_DEC
|
|
|
static int
|
static int
|
try_pre_increment_1 (struct propagate_block_info *pbi, rtx insn)
|
try_pre_increment_1 (struct propagate_block_info *pbi, rtx insn)
|
{
|
{
|
/* Find the next use of this reg. If in same basic block,
|
/* Find the next use of this reg. If in same basic block,
|
make it do pre-increment or pre-decrement if appropriate. */
|
make it do pre-increment or pre-decrement if appropriate. */
|
rtx x = single_set (insn);
|
rtx x = single_set (insn);
|
HOST_WIDE_INT amount = ((GET_CODE (SET_SRC (x)) == PLUS ? 1 : -1)
|
HOST_WIDE_INT amount = ((GET_CODE (SET_SRC (x)) == PLUS ? 1 : -1)
|
* INTVAL (XEXP (SET_SRC (x), 1)));
|
* INTVAL (XEXP (SET_SRC (x), 1)));
|
int regno = REGNO (SET_DEST (x));
|
int regno = REGNO (SET_DEST (x));
|
rtx y = pbi->reg_next_use[regno];
|
rtx y = pbi->reg_next_use[regno];
|
if (y != 0
|
if (y != 0
|
&& SET_DEST (x) != stack_pointer_rtx
|
&& SET_DEST (x) != stack_pointer_rtx
|
&& BLOCK_NUM (y) == BLOCK_NUM (insn)
|
&& BLOCK_NUM (y) == BLOCK_NUM (insn)
|
/* Don't do this if the reg dies, or gets set in y; a standard addressing
|
/* Don't do this if the reg dies, or gets set in y; a standard addressing
|
mode would be better. */
|
mode would be better. */
|
&& ! dead_or_set_p (y, SET_DEST (x))
|
&& ! dead_or_set_p (y, SET_DEST (x))
|
&& try_pre_increment (y, SET_DEST (x), amount))
|
&& try_pre_increment (y, SET_DEST (x), amount))
|
{
|
{
|
/* We have found a suitable auto-increment and already changed
|
/* We have found a suitable auto-increment and already changed
|
insn Y to do it. So flush this increment instruction. */
|
insn Y to do it. So flush this increment instruction. */
|
propagate_block_delete_insn (insn);
|
propagate_block_delete_insn (insn);
|
|
|
/* Count a reference to this reg for the increment insn we are
|
/* Count a reference to this reg for the increment insn we are
|
deleting. When a reg is incremented, spilling it is worse,
|
deleting. When a reg is incremented, spilling it is worse,
|
so we want to make that less likely. */
|
so we want to make that less likely. */
|
if (regno >= FIRST_PSEUDO_REGISTER)
|
if (regno >= FIRST_PSEUDO_REGISTER)
|
{
|
{
|
REG_FREQ (regno) += REG_FREQ_FROM_BB (pbi->bb);
|
REG_FREQ (regno) += REG_FREQ_FROM_BB (pbi->bb);
|
REG_N_SETS (regno)++;
|
REG_N_SETS (regno)++;
|
}
|
}
|
|
|
/* Flush any remembered memories depending on the value of
|
/* Flush any remembered memories depending on the value of
|
the incremented register. */
|
the incremented register. */
|
invalidate_mems_from_set (pbi, SET_DEST (x));
|
invalidate_mems_from_set (pbi, SET_DEST (x));
|
|
|
return 1;
|
return 1;
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Try to change INSN so that it does pre-increment or pre-decrement
|
/* Try to change INSN so that it does pre-increment or pre-decrement
|
addressing on register REG in order to add AMOUNT to REG.
|
addressing on register REG in order to add AMOUNT to REG.
|
AMOUNT is negative for pre-decrement.
|
AMOUNT is negative for pre-decrement.
|
Returns 1 if the change could be made.
|
Returns 1 if the change could be made.
|
This checks all about the validity of the result of modifying INSN. */
|
This checks all about the validity of the result of modifying INSN. */
|
|
|
static int
|
static int
|
try_pre_increment (rtx insn, rtx reg, HOST_WIDE_INT amount)
|
try_pre_increment (rtx insn, rtx reg, HOST_WIDE_INT amount)
|
{
|
{
|
rtx use;
|
rtx use;
|
|
|
/* Nonzero if we can try to make a pre-increment or pre-decrement.
|
/* Nonzero if we can try to make a pre-increment or pre-decrement.
|
For example, addl $4,r1; movl (r1),... can become movl +(r1),... */
|
For example, addl $4,r1; movl (r1),... can become movl +(r1),... */
|
int pre_ok = 0;
|
int pre_ok = 0;
|
/* Nonzero if we can try to make a post-increment or post-decrement.
|
/* Nonzero if we can try to make a post-increment or post-decrement.
|
For example, addl $4,r1; movl -4(r1),... can become movl (r1)+,...
|
For example, addl $4,r1; movl -4(r1),... can become movl (r1)+,...
|
It is possible for both PRE_OK and POST_OK to be nonzero if the machine
|
It is possible for both PRE_OK and POST_OK to be nonzero if the machine
|
supports both pre-inc and post-inc, or both pre-dec and post-dec. */
|
supports both pre-inc and post-inc, or both pre-dec and post-dec. */
|
int post_ok = 0;
|
int post_ok = 0;
|
|
|
/* Nonzero if the opportunity actually requires post-inc or post-dec. */
|
/* Nonzero if the opportunity actually requires post-inc or post-dec. */
|
int do_post = 0;
|
int do_post = 0;
|
|
|
/* From the sign of increment, see which possibilities are conceivable
|
/* From the sign of increment, see which possibilities are conceivable
|
on this target machine. */
|
on this target machine. */
|
if (HAVE_PRE_INCREMENT && amount > 0)
|
if (HAVE_PRE_INCREMENT && amount > 0)
|
pre_ok = 1;
|
pre_ok = 1;
|
if (HAVE_POST_INCREMENT && amount > 0)
|
if (HAVE_POST_INCREMENT && amount > 0)
|
post_ok = 1;
|
post_ok = 1;
|
|
|
if (HAVE_PRE_DECREMENT && amount < 0)
|
if (HAVE_PRE_DECREMENT && amount < 0)
|
pre_ok = 1;
|
pre_ok = 1;
|
if (HAVE_POST_DECREMENT && amount < 0)
|
if (HAVE_POST_DECREMENT && amount < 0)
|
post_ok = 1;
|
post_ok = 1;
|
|
|
if (! (pre_ok || post_ok))
|
if (! (pre_ok || post_ok))
|
return 0;
|
return 0;
|
|
|
/* It is not safe to add a side effect to a jump insn
|
/* It is not safe to add a side effect to a jump insn
|
because if the incremented register is spilled and must be reloaded
|
because if the incremented register is spilled and must be reloaded
|
there would be no way to store the incremented value back in memory. */
|
there would be no way to store the incremented value back in memory. */
|
|
|
if (JUMP_P (insn))
|
if (JUMP_P (insn))
|
return 0;
|
return 0;
|
|
|
use = 0;
|
use = 0;
|
if (pre_ok)
|
if (pre_ok)
|
use = find_use_as_address (PATTERN (insn), reg, 0);
|
use = find_use_as_address (PATTERN (insn), reg, 0);
|
if (post_ok && (use == 0 || use == (rtx) (size_t) 1))
|
if (post_ok && (use == 0 || use == (rtx) (size_t) 1))
|
{
|
{
|
use = find_use_as_address (PATTERN (insn), reg, -amount);
|
use = find_use_as_address (PATTERN (insn), reg, -amount);
|
do_post = 1;
|
do_post = 1;
|
}
|
}
|
|
|
if (use == 0 || use == (rtx) (size_t) 1)
|
if (use == 0 || use == (rtx) (size_t) 1)
|
return 0;
|
return 0;
|
|
|
if (GET_MODE_SIZE (GET_MODE (use)) != (amount > 0 ? amount : - amount))
|
if (GET_MODE_SIZE (GET_MODE (use)) != (amount > 0 ? amount : - amount))
|
return 0;
|
return 0;
|
|
|
/* See if this combination of instruction and addressing mode exists. */
|
/* See if this combination of instruction and addressing mode exists. */
|
if (! validate_change (insn, &XEXP (use, 0),
|
if (! validate_change (insn, &XEXP (use, 0),
|
gen_rtx_fmt_e (amount > 0
|
gen_rtx_fmt_e (amount > 0
|
? (do_post ? POST_INC : PRE_INC)
|
? (do_post ? POST_INC : PRE_INC)
|
: (do_post ? POST_DEC : PRE_DEC),
|
: (do_post ? POST_DEC : PRE_DEC),
|
Pmode, reg), 0))
|
Pmode, reg), 0))
|
return 0;
|
return 0;
|
|
|
/* Record that this insn now has an implicit side effect on X. */
|
/* Record that this insn now has an implicit side effect on X. */
|
REG_NOTES (insn) = alloc_EXPR_LIST (REG_INC, reg, REG_NOTES (insn));
|
REG_NOTES (insn) = alloc_EXPR_LIST (REG_INC, reg, REG_NOTES (insn));
|
return 1;
|
return 1;
|
}
|
}
|
|
|
#endif /* AUTO_INC_DEC */
|
#endif /* AUTO_INC_DEC */
|
|
|
/* Find the place in the rtx X where REG is used as a memory address.
|
/* Find the place in the rtx X where REG is used as a memory address.
|
Return the MEM rtx that so uses it.
|
Return the MEM rtx that so uses it.
|
If PLUSCONST is nonzero, search instead for a memory address equivalent to
|
If PLUSCONST is nonzero, search instead for a memory address equivalent to
|
(plus REG (const_int PLUSCONST)).
|
(plus REG (const_int PLUSCONST)).
|
|
|
If such an address does not appear, return 0.
|
If such an address does not appear, return 0.
|
If REG appears more than once, or is used other than in such an address,
|
If REG appears more than once, or is used other than in such an address,
|
return (rtx) 1. */
|
return (rtx) 1. */
|
|
|
rtx
|
rtx
|
find_use_as_address (rtx x, rtx reg, HOST_WIDE_INT plusconst)
|
find_use_as_address (rtx x, rtx reg, HOST_WIDE_INT plusconst)
|
{
|
{
|
enum rtx_code code = GET_CODE (x);
|
enum rtx_code code = GET_CODE (x);
|
const char * const fmt = GET_RTX_FORMAT (code);
|
const char * const fmt = GET_RTX_FORMAT (code);
|
int i;
|
int i;
|
rtx value = 0;
|
rtx value = 0;
|
rtx tem;
|
rtx tem;
|
|
|
if (code == MEM && XEXP (x, 0) == reg && plusconst == 0)
|
if (code == MEM && XEXP (x, 0) == reg && plusconst == 0)
|
return x;
|
return x;
|
|
|
if (code == MEM && GET_CODE (XEXP (x, 0)) == PLUS
|
if (code == MEM && GET_CODE (XEXP (x, 0)) == PLUS
|
&& XEXP (XEXP (x, 0), 0) == reg
|
&& XEXP (XEXP (x, 0), 0) == reg
|
&& GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
|
&& GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
|
&& INTVAL (XEXP (XEXP (x, 0), 1)) == plusconst)
|
&& INTVAL (XEXP (XEXP (x, 0), 1)) == plusconst)
|
return x;
|
return x;
|
|
|
if (code == SIGN_EXTRACT || code == ZERO_EXTRACT)
|
if (code == SIGN_EXTRACT || code == ZERO_EXTRACT)
|
{
|
{
|
/* If REG occurs inside a MEM used in a bit-field reference,
|
/* If REG occurs inside a MEM used in a bit-field reference,
|
that is unacceptable. */
|
that is unacceptable. */
|
if (find_use_as_address (XEXP (x, 0), reg, 0) != 0)
|
if (find_use_as_address (XEXP (x, 0), reg, 0) != 0)
|
return (rtx) (size_t) 1;
|
return (rtx) (size_t) 1;
|
}
|
}
|
|
|
if (x == reg)
|
if (x == reg)
|
return (rtx) (size_t) 1;
|
return (rtx) (size_t) 1;
|
|
|
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
|
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
|
{
|
{
|
if (fmt[i] == 'e')
|
if (fmt[i] == 'e')
|
{
|
{
|
tem = find_use_as_address (XEXP (x, i), reg, plusconst);
|
tem = find_use_as_address (XEXP (x, i), reg, plusconst);
|
if (value == 0)
|
if (value == 0)
|
value = tem;
|
value = tem;
|
else if (tem != 0)
|
else if (tem != 0)
|
return (rtx) (size_t) 1;
|
return (rtx) (size_t) 1;
|
}
|
}
|
else if (fmt[i] == 'E')
|
else if (fmt[i] == 'E')
|
{
|
{
|
int j;
|
int j;
|
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
|
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
|
{
|
{
|
tem = find_use_as_address (XVECEXP (x, i, j), reg, plusconst);
|
tem = find_use_as_address (XVECEXP (x, i, j), reg, plusconst);
|
if (value == 0)
|
if (value == 0)
|
value = tem;
|
value = tem;
|
else if (tem != 0)
|
else if (tem != 0)
|
return (rtx) (size_t) 1;
|
return (rtx) (size_t) 1;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
return value;
|
return value;
|
}
|
}
|
|
|
/* Write information about registers and basic blocks into FILE.
|
/* Write information about registers and basic blocks into FILE.
|
This is part of making a debugging dump. */
|
This is part of making a debugging dump. */
|
|
|
void
|
void
|
dump_regset (regset r, FILE *outf)
|
dump_regset (regset r, FILE *outf)
|
{
|
{
|
unsigned i;
|
unsigned i;
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
if (r == NULL)
|
if (r == NULL)
|
{
|
{
|
fputs (" (nil)", outf);
|
fputs (" (nil)", outf);
|
return;
|
return;
|
}
|
}
|
|
|
EXECUTE_IF_SET_IN_REG_SET (r, 0, i, rsi)
|
EXECUTE_IF_SET_IN_REG_SET (r, 0, i, rsi)
|
{
|
{
|
fprintf (outf, " %d", i);
|
fprintf (outf, " %d", i);
|
if (i < FIRST_PSEUDO_REGISTER)
|
if (i < FIRST_PSEUDO_REGISTER)
|
fprintf (outf, " [%s]",
|
fprintf (outf, " [%s]",
|
reg_names[i]);
|
reg_names[i]);
|
}
|
}
|
}
|
}
|
|
|
/* Print a human-readable representation of R on the standard error
|
/* Print a human-readable representation of R on the standard error
|
stream. This function is designed to be used from within the
|
stream. This function is designed to be used from within the
|
debugger. */
|
debugger. */
|
|
|
void
|
void
|
debug_regset (regset r)
|
debug_regset (regset r)
|
{
|
{
|
dump_regset (r, stderr);
|
dump_regset (r, stderr);
|
putc ('\n', stderr);
|
putc ('\n', stderr);
|
}
|
}
|
|
|
/* Recompute register set/reference counts immediately prior to register
|
/* Recompute register set/reference counts immediately prior to register
|
allocation.
|
allocation.
|
|
|
This avoids problems with set/reference counts changing to/from values
|
This avoids problems with set/reference counts changing to/from values
|
which have special meanings to the register allocators.
|
which have special meanings to the register allocators.
|
|
|
Additionally, the reference counts are the primary component used by the
|
Additionally, the reference counts are the primary component used by the
|
register allocators to prioritize pseudos for allocation to hard regs.
|
register allocators to prioritize pseudos for allocation to hard regs.
|
More accurate reference counts generally lead to better register allocation.
|
More accurate reference counts generally lead to better register allocation.
|
|
|
It might be worthwhile to update REG_LIVE_LENGTH, REG_BASIC_BLOCK and
|
It might be worthwhile to update REG_LIVE_LENGTH, REG_BASIC_BLOCK and
|
possibly other information which is used by the register allocators. */
|
possibly other information which is used by the register allocators. */
|
|
|
static unsigned int
|
static unsigned int
|
recompute_reg_usage (void)
|
recompute_reg_usage (void)
|
{
|
{
|
allocate_reg_life_data ();
|
allocate_reg_life_data ();
|
/* distribute_notes in combiner fails to convert some of the
|
/* distribute_notes in combiner fails to convert some of the
|
REG_UNUSED notes to REG_DEAD notes. This causes CHECK_DEAD_NOTES
|
REG_UNUSED notes to REG_DEAD notes. This causes CHECK_DEAD_NOTES
|
in sched1 to die. To solve this update the DEATH_NOTES
|
in sched1 to die. To solve this update the DEATH_NOTES
|
here. */
|
here. */
|
update_life_info (NULL, UPDATE_LIFE_LOCAL, PROP_REG_INFO | PROP_DEATH_NOTES);
|
update_life_info (NULL, UPDATE_LIFE_LOCAL, PROP_REG_INFO | PROP_DEATH_NOTES);
|
|
|
if (dump_file)
|
if (dump_file)
|
dump_flow_info (dump_file, dump_flags);
|
dump_flow_info (dump_file, dump_flags);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
struct tree_opt_pass pass_recompute_reg_usage =
|
struct tree_opt_pass pass_recompute_reg_usage =
|
{
|
{
|
"life2", /* name */
|
"life2", /* name */
|
NULL, /* gate */
|
NULL, /* gate */
|
recompute_reg_usage, /* execute */
|
recompute_reg_usage, /* execute */
|
NULL, /* sub */
|
NULL, /* sub */
|
NULL, /* next */
|
NULL, /* next */
|
0, /* static_pass_number */
|
0, /* static_pass_number */
|
0, /* tv_id */
|
0, /* tv_id */
|
0, /* properties_required */
|
0, /* properties_required */
|
0, /* properties_provided */
|
0, /* properties_provided */
|
0, /* properties_destroyed */
|
0, /* properties_destroyed */
|
0, /* todo_flags_start */
|
0, /* todo_flags_start */
|
TODO_dump_func, /* todo_flags_finish */
|
TODO_dump_func, /* todo_flags_finish */
|
'f' /* letter */
|
'f' /* letter */
|
};
|
};
|
|
|
/* Optionally removes all the REG_DEAD and REG_UNUSED notes from a set of
|
/* Optionally removes all the REG_DEAD and REG_UNUSED notes from a set of
|
blocks. If BLOCKS is NULL, assume the universal set. Returns a count
|
blocks. If BLOCKS is NULL, assume the universal set. Returns a count
|
of the number of registers that died.
|
of the number of registers that died.
|
If KILL is 1, remove old REG_DEAD / REG_UNUSED notes. If it is 0, don't.
|
If KILL is 1, remove old REG_DEAD / REG_UNUSED notes. If it is 0, don't.
|
if it is -1, remove them unless they pertain to a stack reg. */
|
if it is -1, remove them unless they pertain to a stack reg. */
|
|
|
int
|
int
|
count_or_remove_death_notes (sbitmap blocks, int kill)
|
count_or_remove_death_notes (sbitmap blocks, int kill)
|
{
|
{
|
int count = 0;
|
int count = 0;
|
unsigned int i = 0;
|
unsigned int i = 0;
|
basic_block bb;
|
basic_block bb;
|
|
|
/* This used to be a loop over all the blocks with a membership test
|
/* This used to be a loop over all the blocks with a membership test
|
inside the loop. That can be amazingly expensive on a large CFG
|
inside the loop. That can be amazingly expensive on a large CFG
|
when only a small number of bits are set in BLOCKs (for example,
|
when only a small number of bits are set in BLOCKs (for example,
|
the calls from the scheduler typically have very few bits set).
|
the calls from the scheduler typically have very few bits set).
|
|
|
For extra credit, someone should convert BLOCKS to a bitmap rather
|
For extra credit, someone should convert BLOCKS to a bitmap rather
|
than an sbitmap. */
|
than an sbitmap. */
|
if (blocks)
|
if (blocks)
|
{
|
{
|
sbitmap_iterator sbi;
|
sbitmap_iterator sbi;
|
|
|
EXECUTE_IF_SET_IN_SBITMAP (blocks, 0, i, sbi)
|
EXECUTE_IF_SET_IN_SBITMAP (blocks, 0, i, sbi)
|
{
|
{
|
basic_block bb = BASIC_BLOCK (i);
|
basic_block bb = BASIC_BLOCK (i);
|
/* The bitmap may be flawed in that one of the basic blocks
|
/* The bitmap may be flawed in that one of the basic blocks
|
may have been deleted before you get here. */
|
may have been deleted before you get here. */
|
if (bb)
|
if (bb)
|
count += count_or_remove_death_notes_bb (bb, kill);
|
count += count_or_remove_death_notes_bb (bb, kill);
|
};
|
};
|
}
|
}
|
else
|
else
|
{
|
{
|
FOR_EACH_BB (bb)
|
FOR_EACH_BB (bb)
|
{
|
{
|
count += count_or_remove_death_notes_bb (bb, kill);
|
count += count_or_remove_death_notes_bb (bb, kill);
|
}
|
}
|
}
|
}
|
|
|
return count;
|
return count;
|
}
|
}
|
|
|
/* Optionally removes all the REG_DEAD and REG_UNUSED notes from basic
|
/* Optionally removes all the REG_DEAD and REG_UNUSED notes from basic
|
block BB. Returns a count of the number of registers that died. */
|
block BB. Returns a count of the number of registers that died. */
|
|
|
static int
|
static int
|
count_or_remove_death_notes_bb (basic_block bb, int kill)
|
count_or_remove_death_notes_bb (basic_block bb, int kill)
|
{
|
{
|
int count = 0;
|
int count = 0;
|
rtx insn;
|
rtx insn;
|
|
|
for (insn = BB_HEAD (bb); ; insn = NEXT_INSN (insn))
|
for (insn = BB_HEAD (bb); ; insn = NEXT_INSN (insn))
|
{
|
{
|
if (INSN_P (insn))
|
if (INSN_P (insn))
|
{
|
{
|
rtx *pprev = ®_NOTES (insn);
|
rtx *pprev = ®_NOTES (insn);
|
rtx link = *pprev;
|
rtx link = *pprev;
|
|
|
while (link)
|
while (link)
|
{
|
{
|
switch (REG_NOTE_KIND (link))
|
switch (REG_NOTE_KIND (link))
|
{
|
{
|
case REG_DEAD:
|
case REG_DEAD:
|
if (REG_P (XEXP (link, 0)))
|
if (REG_P (XEXP (link, 0)))
|
{
|
{
|
rtx reg = XEXP (link, 0);
|
rtx reg = XEXP (link, 0);
|
int n;
|
int n;
|
|
|
if (REGNO (reg) >= FIRST_PSEUDO_REGISTER)
|
if (REGNO (reg) >= FIRST_PSEUDO_REGISTER)
|
n = 1;
|
n = 1;
|
else
|
else
|
n = hard_regno_nregs[REGNO (reg)][GET_MODE (reg)];
|
n = hard_regno_nregs[REGNO (reg)][GET_MODE (reg)];
|
count += n;
|
count += n;
|
}
|
}
|
|
|
/* Fall through. */
|
/* Fall through. */
|
|
|
case REG_UNUSED:
|
case REG_UNUSED:
|
if (kill > 0
|
if (kill > 0
|
|| (kill
|
|| (kill
|
#ifdef STACK_REGS
|
#ifdef STACK_REGS
|
&& (!REG_P (XEXP (link, 0))
|
&& (!REG_P (XEXP (link, 0))
|
|| !IN_RANGE (REGNO (XEXP (link, 0)),
|
|| !IN_RANGE (REGNO (XEXP (link, 0)),
|
FIRST_STACK_REG, LAST_STACK_REG))
|
FIRST_STACK_REG, LAST_STACK_REG))
|
#endif
|
#endif
|
))
|
))
|
{
|
{
|
rtx next = XEXP (link, 1);
|
rtx next = XEXP (link, 1);
|
free_EXPR_LIST_node (link);
|
free_EXPR_LIST_node (link);
|
*pprev = link = next;
|
*pprev = link = next;
|
break;
|
break;
|
}
|
}
|
/* Fall through. */
|
/* Fall through. */
|
|
|
default:
|
default:
|
pprev = &XEXP (link, 1);
|
pprev = &XEXP (link, 1);
|
link = *pprev;
|
link = *pprev;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
if (insn == BB_END (bb))
|
if (insn == BB_END (bb))
|
break;
|
break;
|
}
|
}
|
|
|
return count;
|
return count;
|
}
|
}
|
|
|
/* Clear LOG_LINKS fields of insns in a selected blocks or whole chain
|
/* Clear LOG_LINKS fields of insns in a selected blocks or whole chain
|
if blocks is NULL. */
|
if blocks is NULL. */
|
|
|
static void
|
static void
|
clear_log_links (sbitmap blocks)
|
clear_log_links (sbitmap blocks)
|
{
|
{
|
rtx insn;
|
rtx insn;
|
|
|
if (!blocks)
|
if (!blocks)
|
{
|
{
|
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
|
for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
|
if (INSN_P (insn))
|
if (INSN_P (insn))
|
free_INSN_LIST_list (&LOG_LINKS (insn));
|
free_INSN_LIST_list (&LOG_LINKS (insn));
|
}
|
}
|
else
|
else
|
{
|
{
|
unsigned int i = 0;
|
unsigned int i = 0;
|
sbitmap_iterator sbi;
|
sbitmap_iterator sbi;
|
|
|
EXECUTE_IF_SET_IN_SBITMAP (blocks, 0, i, sbi)
|
EXECUTE_IF_SET_IN_SBITMAP (blocks, 0, i, sbi)
|
{
|
{
|
basic_block bb = BASIC_BLOCK (i);
|
basic_block bb = BASIC_BLOCK (i);
|
|
|
for (insn = BB_HEAD (bb); insn != NEXT_INSN (BB_END (bb));
|
for (insn = BB_HEAD (bb); insn != NEXT_INSN (BB_END (bb));
|
insn = NEXT_INSN (insn))
|
insn = NEXT_INSN (insn))
|
if (INSN_P (insn))
|
if (INSN_P (insn))
|
free_INSN_LIST_list (&LOG_LINKS (insn));
|
free_INSN_LIST_list (&LOG_LINKS (insn));
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Given a register bitmap, turn on the bits in a HARD_REG_SET that
|
/* Given a register bitmap, turn on the bits in a HARD_REG_SET that
|
correspond to the hard registers, if any, set in that map. This
|
correspond to the hard registers, if any, set in that map. This
|
could be done far more efficiently by having all sorts of special-cases
|
could be done far more efficiently by having all sorts of special-cases
|
with moving single words, but probably isn't worth the trouble. */
|
with moving single words, but probably isn't worth the trouble. */
|
|
|
void
|
void
|
reg_set_to_hard_reg_set (HARD_REG_SET *to, bitmap from)
|
reg_set_to_hard_reg_set (HARD_REG_SET *to, bitmap from)
|
{
|
{
|
unsigned i;
|
unsigned i;
|
bitmap_iterator bi;
|
bitmap_iterator bi;
|
|
|
EXECUTE_IF_SET_IN_BITMAP (from, 0, i, bi)
|
EXECUTE_IF_SET_IN_BITMAP (from, 0, i, bi)
|
{
|
{
|
if (i >= FIRST_PSEUDO_REGISTER)
|
if (i >= FIRST_PSEUDO_REGISTER)
|
return;
|
return;
|
SET_HARD_REG_BIT (*to, i);
|
SET_HARD_REG_BIT (*to, i);
|
}
|
}
|
}
|
}
|
|
|
|
|
static bool
|
static bool
|
gate_remove_death_notes (void)
|
gate_remove_death_notes (void)
|
{
|
{
|
return flag_profile_values;
|
return flag_profile_values;
|
}
|
}
|
|
|
static unsigned int
|
static unsigned int
|
rest_of_handle_remove_death_notes (void)
|
rest_of_handle_remove_death_notes (void)
|
{
|
{
|
count_or_remove_death_notes (NULL, 1);
|
count_or_remove_death_notes (NULL, 1);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
struct tree_opt_pass pass_remove_death_notes =
|
struct tree_opt_pass pass_remove_death_notes =
|
{
|
{
|
"ednotes", /* name */
|
"ednotes", /* name */
|
gate_remove_death_notes, /* gate */
|
gate_remove_death_notes, /* gate */
|
rest_of_handle_remove_death_notes, /* execute */
|
rest_of_handle_remove_death_notes, /* execute */
|
NULL, /* sub */
|
NULL, /* sub */
|
NULL, /* next */
|
NULL, /* next */
|
0, /* static_pass_number */
|
0, /* static_pass_number */
|
0, /* tv_id */
|
0, /* tv_id */
|
0, /* properties_required */
|
0, /* properties_required */
|
0, /* properties_provided */
|
0, /* properties_provided */
|
0, /* properties_destroyed */
|
0, /* properties_destroyed */
|
0, /* todo_flags_start */
|
0, /* todo_flags_start */
|
0, /* todo_flags_finish */
|
0, /* todo_flags_finish */
|
0 /* letter */
|
0 /* letter */
|
};
|
};
|
|
|
/* Perform life analysis. */
|
/* Perform life analysis. */
|
static unsigned int
|
static unsigned int
|
rest_of_handle_life (void)
|
rest_of_handle_life (void)
|
{
|
{
|
regclass_init ();
|
regclass_init ();
|
|
|
life_analysis (PROP_FINAL);
|
life_analysis (PROP_FINAL);
|
if (optimize)
|
if (optimize)
|
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE | CLEANUP_LOG_LINKS
|
cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE | CLEANUP_LOG_LINKS
|
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
|
| (flag_thread_jumps ? CLEANUP_THREADING : 0));
|
|
|
if (extra_warnings)
|
if (extra_warnings)
|
{
|
{
|
setjmp_vars_warning (DECL_INITIAL (current_function_decl));
|
setjmp_vars_warning (DECL_INITIAL (current_function_decl));
|
setjmp_args_warning ();
|
setjmp_args_warning ();
|
}
|
}
|
|
|
if (optimize)
|
if (optimize)
|
{
|
{
|
if (initialize_uninitialized_subregs ())
|
if (initialize_uninitialized_subregs ())
|
{
|
{
|
/* Insns were inserted, and possibly pseudos created, so
|
/* Insns were inserted, and possibly pseudos created, so
|
things might look a bit different. */
|
things might look a bit different. */
|
allocate_reg_life_data ();
|
allocate_reg_life_data ();
|
update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
|
update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
|
PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
|
PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
|
}
|
}
|
}
|
}
|
|
|
no_new_pseudos = 1;
|
no_new_pseudos = 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
struct tree_opt_pass pass_life =
|
struct tree_opt_pass pass_life =
|
{
|
{
|
"life1", /* name */
|
"life1", /* name */
|
NULL, /* gate */
|
NULL, /* gate */
|
rest_of_handle_life, /* execute */
|
rest_of_handle_life, /* execute */
|
NULL, /* sub */
|
NULL, /* sub */
|
NULL, /* next */
|
NULL, /* next */
|
0, /* static_pass_number */
|
0, /* static_pass_number */
|
TV_FLOW, /* tv_id */
|
TV_FLOW, /* tv_id */
|
0, /* properties_required */
|
0, /* properties_required */
|
0, /* properties_provided */
|
0, /* properties_provided */
|
0, /* properties_destroyed */
|
0, /* properties_destroyed */
|
TODO_verify_flow, /* todo_flags_start */
|
TODO_verify_flow, /* todo_flags_start */
|
TODO_dump_func |
|
TODO_dump_func |
|
TODO_ggc_collect, /* todo_flags_finish */
|
TODO_ggc_collect, /* todo_flags_finish */
|
'f' /* letter */
|
'f' /* letter */
|
};
|
};
|
|
|
static unsigned int
|
static unsigned int
|
rest_of_handle_flow2 (void)
|
rest_of_handle_flow2 (void)
|
{
|
{
|
/* If optimizing, then go ahead and split insns now. */
|
/* If optimizing, then go ahead and split insns now. */
|
#ifndef STACK_REGS
|
#ifndef STACK_REGS
|
if (optimize > 0)
|
if (optimize > 0)
|
#endif
|
#endif
|
split_all_insns (0);
|
split_all_insns (0);
|
|
|
if (flag_branch_target_load_optimize)
|
if (flag_branch_target_load_optimize)
|
branch_target_load_optimize (epilogue_completed);
|
branch_target_load_optimize (epilogue_completed);
|
|
|
if (optimize)
|
if (optimize)
|
cleanup_cfg (CLEANUP_EXPENSIVE);
|
cleanup_cfg (CLEANUP_EXPENSIVE);
|
|
|
/* On some machines, the prologue and epilogue code, or parts thereof,
|
/* On some machines, the prologue and epilogue code, or parts thereof,
|
can be represented as RTL. Doing so lets us schedule insns between
|
can be represented as RTL. Doing so lets us schedule insns between
|
it and the rest of the code and also allows delayed branch
|
it and the rest of the code and also allows delayed branch
|
scheduling to operate in the epilogue. */
|
scheduling to operate in the epilogue. */
|
thread_prologue_and_epilogue_insns (get_insns ());
|
thread_prologue_and_epilogue_insns (get_insns ());
|
epilogue_completed = 1;
|
epilogue_completed = 1;
|
flow2_completed = 1;
|
flow2_completed = 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
struct tree_opt_pass pass_flow2 =
|
struct tree_opt_pass pass_flow2 =
|
{
|
{
|
"flow2", /* name */
|
"flow2", /* name */
|
NULL, /* gate */
|
NULL, /* gate */
|
rest_of_handle_flow2, /* execute */
|
rest_of_handle_flow2, /* execute */
|
NULL, /* sub */
|
NULL, /* sub */
|
NULL, /* next */
|
NULL, /* next */
|
0, /* static_pass_number */
|
0, /* static_pass_number */
|
TV_FLOW2, /* tv_id */
|
TV_FLOW2, /* tv_id */
|
0, /* properties_required */
|
0, /* properties_required */
|
0, /* properties_provided */
|
0, /* properties_provided */
|
0, /* properties_destroyed */
|
0, /* properties_destroyed */
|
TODO_verify_flow, /* todo_flags_start */
|
TODO_verify_flow, /* todo_flags_start */
|
TODO_dump_func |
|
TODO_dump_func |
|
TODO_ggc_collect, /* todo_flags_finish */
|
TODO_ggc_collect, /* todo_flags_finish */
|
'w' /* letter */
|
'w' /* letter */
|
};
|
};
|
|
|
|
|
