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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [reg-notes.def] - Blame information for rev 859

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1 280 jeremybenn
/* Register note definitions.
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   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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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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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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version.
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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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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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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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along with GCC; see the file COPYING3.  If not see
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.  */
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/* This file defines all the codes that may appear on individual
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   EXPR_LIST rtxes in the REG_NOTES chain of an insn.  The codes are
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   stored in the mode field of the EXPR_LIST.  Source files define
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   DEF_REG_NOTE appropriately before including this file.  */
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/* Shorthand.  */
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#define REG_NOTE(NAME) DEF_REG_NOTE (REG_##NAME)
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/* REG_DEP_TRUE is used in scheduler dependencies lists to represent a
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   read-after-write dependency (i.e. a true data dependency).  This is
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   here, not grouped with REG_DEP_ANTI and REG_DEP_OUTPUT, because some
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   passes use a literal 0 for it.  */
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REG_NOTE (DEP_TRUE)
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/* The value in REG dies in this insn (i.e., it is not needed past
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   this insn).  If REG is set in this insn, the REG_DEAD note may,
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   but need not, be omitted.  */
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REG_NOTE (DEAD)
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/* The REG is autoincremented or autodecremented in this insn.  */
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REG_NOTE (INC)
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/* Describes the insn as a whole; it says that the insn sets a
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   register to a constant value or to be equivalent to a memory
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   address.  If the register is spilled to the stack then the constant
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   value should be substituted for it.  The contents of the REG_EQUIV
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   is the constant value or memory address, which may be different
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   from the source of the SET although it has the same value.  A
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   REG_EQUIV note may also appear on an insn which copies a register
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   parameter to a pseudo-register, if there is a memory address which
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   could be used to hold that pseudo-register throughout the function.  */
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REG_NOTE (EQUIV)
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/* Like REG_EQUIV except that the destination is only momentarily
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   equal to the specified rtx.  Therefore, it cannot be used for
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   substitution; but it can be used for cse.  */
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REG_NOTE (EQUAL)
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/* The register is always nonnegative during the containing loop.
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   This is used in branches so that decrement and branch instructions
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   terminating on zero can be matched.  There must be an insn pattern
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   in the md file named `decrement_and_branch_until_zero' or else this
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   will never be added to any instructions.  */
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REG_NOTE (NONNEG)
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/* Identifies a register set in this insn and never used.  */
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REG_NOTE (UNUSED)
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/* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
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   CC0, respectively.  Normally, these are required to be consecutive
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   insns, but we permit putting a cc0-setting insn in the delay slot
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   of a branch as long as only one copy of the insn exists.  In that
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   case, these notes point from one to the other to allow code
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   generation to determine what any require information and to
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   properly update CC_STATUS.  These notes are INSN_LISTs.  */
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REG_NOTE (CC_SETTER)
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REG_NOTE (CC_USER)
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/* Points to a CODE_LABEL.  Used by JUMP_INSNs to say that the CODE_LABEL
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   contained in the REG_LABEL_TARGET note is a possible jump target of
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   this insn.  This note is an INSN_LIST.  */
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REG_NOTE (LABEL_TARGET)
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/* Points to a CODE_LABEL.  Used by any insn to say that the CODE_LABEL
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   contained in the REG_LABEL_OPERAND note is used by the insn, but as an
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   operand, not as a jump target (though it may indirectly be a jump
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   target for a later jump insn).  This note is an INSN_LIST.  */
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REG_NOTE (LABEL_OPERAND)
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/* REG_DEP_OUTPUT and REG_DEP_ANTI are used in scheduler dependencies lists
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   to represent write-after-write and write-after-read dependencies
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   respectively.  */
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REG_NOTE (DEP_OUTPUT)
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REG_NOTE (DEP_ANTI)
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/* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.  It has an
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   integer value.  For jumps, it is the probability that this is a
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   taken branch.  For calls, it is the probability that this call
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   won't return.  */
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REG_NOTE (BR_PROB)
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/* REG_VALUE_PROFILE is attached when the profile is read in to an
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   insn before that the code to profile the value is inserted.  It
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   contains the results of profiling.  */
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REG_NOTE (VALUE_PROFILE)
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/* Attached to a call insn; indicates that the call is malloc-like and
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   that the pointer returned cannot alias anything else.  */
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REG_NOTE (NOALIAS)
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/* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs.  It contains
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   CONCAT of two integer value.  First specifies the branch predictor
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   that added the note, second specifies the predicted hitrate of
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   branch in the same format as REG_BR_PROB note uses.  */
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REG_NOTE (BR_PRED)
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/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
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   for DWARF to interpret what they imply.  The attached rtx is used
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   instead of intuition.  */
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REG_NOTE (FRAME_RELATED_EXPR)
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/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
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   for FRAME_RELATED_EXPR intuition.  The insn's first pattern must be
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   a SET, and the destination must be the CFA register.  The attached
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   rtx is an expression that defines the CFA.  In the simplest case, the
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   rtx could be just the stack_pointer_rtx; more common would be a PLUS
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   with a base register and a constant offset.  In the most complicated
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   cases, this will result in a DW_CFA_def_cfa_expression with the rtx
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   expression rendered in a dwarf location expression.  */
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REG_NOTE (CFA_DEF_CFA)
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/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
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   for FRAME_RELATED_EXPR intuition.  This note adjusts the expression
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   from which the CFA is computed.  The attached rtx defines a new CFA
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   expression, relative to the old CFA expression.  This rtx must be of
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   the form (SET new-cfa-reg (PLUS old-cfa-reg const_int)).  If the note
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   rtx is NULL, we use the first SET of the insn.  */
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REG_NOTE (CFA_ADJUST_CFA)
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/* Similar to FRAME_RELATED_EXPR, with the additional information that
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   this is a save to memory, i.e. will result in DW_CFA_offset or the
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   like.  The pattern or the insn should be a simple store relative to
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   the CFA.  */
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REG_NOTE (CFA_OFFSET)
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/* Similar to FRAME_RELATED_EXPR, with the additional information that this
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   is a save to a register, i.e. will result in DW_CFA_register.  The insn
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   or the pattern should be simple reg-reg move.  */
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REG_NOTE (CFA_REGISTER)
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/* Attached to insns that are RTX_FRAME_RELATED_P, with the information
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   that this is a restore operation, i.e. will result in DW_CFA_restore
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   or the like.  Either the attached rtx, or the destination of the insn's
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   first pattern is the register to be restored.  */
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REG_NOTE (CFA_RESTORE)
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/* Attached to insn that is RTX_FRAME_RELATED_P, marks insn that sets
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   vDRAP from DRAP.  If vDRAP is a register, vdrap_reg is initalized
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   to the argument, if it is a MEM, it is ignored.  */
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REG_NOTE (CFA_SET_VDRAP)
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/* Indicates that REG holds the exception context for the function.
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   This context is shared by inline functions, so the code to acquire
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   the real exception context is delayed until after inlining.  */
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REG_NOTE (EH_CONTEXT)
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/* Indicates what exception region an INSN belongs in.  This is used
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   to indicate what region to which a call may throw.  REGION 0
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   indicates that a call cannot throw at all.  REGION -1 indicates
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   that it cannot throw, nor will it execute a non-local goto.  */
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REG_NOTE (EH_REGION)
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/* Used by haifa-sched to save NOTE_INSN notes across scheduling.  */
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REG_NOTE (SAVE_NOTE)
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/* Indicates that a call does not return.  */
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REG_NOTE (NORETURN)
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/* Indicates that an indirect jump is a non-local goto instead of a
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   computed goto.  */
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REG_NOTE (NON_LOCAL_GOTO)
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/* Indicates that a jump crosses between hot and cold sections in a
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   (partitioned) assembly or .o file, and therefore should not be
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   reduced to a simpler jump by optimizations.  */
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REG_NOTE (CROSSING_JUMP)
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/* This kind of note is generated at each to `setjmp', and similar
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   functions that can return twice.  */
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REG_NOTE (SETJMP)

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