/* Save and restore call-clobbered registers which are live across a call.
|
/* Save and restore call-clobbered registers which are live across a call.
|
Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002,
|
Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002,
|
2003, 2004, 2005, 2007 Free Software Foundation, Inc.
|
2003, 2004, 2005, 2007 Free Software Foundation, Inc.
|
|
|
This file is part of GCC.
|
This file is part of GCC.
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
GCC is free software; you can redistribute it and/or modify it under
|
the terms of the GNU General Public License as published by the Free
|
the terms of the GNU General Public License as published by the Free
|
Software Foundation; either version 3, or (at your option) any later
|
Software Foundation; either version 3, or (at your option) any later
|
version.
|
version.
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
for more details.
|
for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with GCC; see the file COPYING3. If not see
|
along with GCC; see the file COPYING3. If not see
|
<http://www.gnu.org/licenses/>. */
|
<http://www.gnu.org/licenses/>. */
|
|
|
#include "config.h"
|
#include "config.h"
|
#include "system.h"
|
#include "system.h"
|
#include "coretypes.h"
|
#include "coretypes.h"
|
#include "tm.h"
|
#include "tm.h"
|
#include "rtl.h"
|
#include "rtl.h"
|
#include "regs.h"
|
#include "regs.h"
|
#include "insn-config.h"
|
#include "insn-config.h"
|
#include "flags.h"
|
#include "flags.h"
|
#include "hard-reg-set.h"
|
#include "hard-reg-set.h"
|
#include "recog.h"
|
#include "recog.h"
|
#include "basic-block.h"
|
#include "basic-block.h"
|
#include "reload.h"
|
#include "reload.h"
|
#include "function.h"
|
#include "function.h"
|
#include "expr.h"
|
#include "expr.h"
|
#include "toplev.h"
|
#include "toplev.h"
|
#include "tm_p.h"
|
#include "tm_p.h"
|
#include "addresses.h"
|
#include "addresses.h"
|
|
|
#ifndef MAX_MOVE_MAX
|
#ifndef MAX_MOVE_MAX
|
#define MAX_MOVE_MAX MOVE_MAX
|
#define MAX_MOVE_MAX MOVE_MAX
|
#endif
|
#endif
|
|
|
#ifndef MIN_UNITS_PER_WORD
|
#ifndef MIN_UNITS_PER_WORD
|
#define MIN_UNITS_PER_WORD UNITS_PER_WORD
|
#define MIN_UNITS_PER_WORD UNITS_PER_WORD
|
#endif
|
#endif
|
|
|
#define MOVE_MAX_WORDS (MOVE_MAX / UNITS_PER_WORD)
|
#define MOVE_MAX_WORDS (MOVE_MAX / UNITS_PER_WORD)
|
|
|
/* Modes for each hard register that we can save. The smallest mode is wide
|
/* Modes for each hard register that we can save. The smallest mode is wide
|
enough to save the entire contents of the register. When saving the
|
enough to save the entire contents of the register. When saving the
|
register because it is live we first try to save in multi-register modes.
|
register because it is live we first try to save in multi-register modes.
|
If that is not possible the save is done one register at a time. */
|
If that is not possible the save is done one register at a time. */
|
|
|
static enum machine_mode
|
static enum machine_mode
|
regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
|
regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
|
|
|
/* For each hard register, a place on the stack where it can be saved,
|
/* For each hard register, a place on the stack where it can be saved,
|
if needed. */
|
if needed. */
|
|
|
static rtx
|
static rtx
|
regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
|
regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
|
|
|
/* We will only make a register eligible for caller-save if it can be
|
/* We will only make a register eligible for caller-save if it can be
|
saved in its widest mode with a simple SET insn as long as the memory
|
saved in its widest mode with a simple SET insn as long as the memory
|
address is valid. We record the INSN_CODE is those insns here since
|
address is valid. We record the INSN_CODE is those insns here since
|
when we emit them, the addresses might not be valid, so they might not
|
when we emit them, the addresses might not be valid, so they might not
|
be recognized. */
|
be recognized. */
|
|
|
static int
|
static int
|
reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
|
reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
|
static int
|
static int
|
reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
|
reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
|
|
|
/* Set of hard regs currently residing in save area (during insn scan). */
|
/* Set of hard regs currently residing in save area (during insn scan). */
|
|
|
static HARD_REG_SET hard_regs_saved;
|
static HARD_REG_SET hard_regs_saved;
|
|
|
/* Number of registers currently in hard_regs_saved. */
|
/* Number of registers currently in hard_regs_saved. */
|
|
|
static int n_regs_saved;
|
static int n_regs_saved;
|
|
|
/* Computed by mark_referenced_regs, all regs referenced in a given
|
/* Computed by mark_referenced_regs, all regs referenced in a given
|
insn. */
|
insn. */
|
static HARD_REG_SET referenced_regs;
|
static HARD_REG_SET referenced_regs;
|
|
|
|
|
static void mark_set_regs (rtx, rtx, void *);
|
static void mark_set_regs (rtx, rtx, void *);
|
static void mark_referenced_regs (rtx);
|
static void mark_referenced_regs (rtx);
|
static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *,
|
static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *,
|
enum machine_mode *);
|
enum machine_mode *);
|
static int insert_restore (struct insn_chain *, int, int, int,
|
static int insert_restore (struct insn_chain *, int, int, int,
|
enum machine_mode *);
|
enum machine_mode *);
|
static struct insn_chain *insert_one_insn (struct insn_chain *, int, int,
|
static struct insn_chain *insert_one_insn (struct insn_chain *, int, int,
|
rtx);
|
rtx);
|
static void add_stored_regs (rtx, rtx, void *);
|
static void add_stored_regs (rtx, rtx, void *);
|
|
|
/* Initialize for caller-save.
|
/* Initialize for caller-save.
|
|
|
Look at all the hard registers that are used by a call and for which
|
Look at all the hard registers that are used by a call and for which
|
regclass.c has not already excluded from being used across a call.
|
regclass.c has not already excluded from being used across a call.
|
|
|
Ensure that we can find a mode to save the register and that there is a
|
Ensure that we can find a mode to save the register and that there is a
|
simple insn to save and restore the register. This latter check avoids
|
simple insn to save and restore the register. This latter check avoids
|
problems that would occur if we tried to save the MQ register of some
|
problems that would occur if we tried to save the MQ register of some
|
machines directly into memory. */
|
machines directly into memory. */
|
|
|
void
|
void
|
init_caller_save (void)
|
init_caller_save (void)
|
{
|
{
|
rtx addr_reg;
|
rtx addr_reg;
|
int offset;
|
int offset;
|
rtx address;
|
rtx address;
|
int i, j;
|
int i, j;
|
enum machine_mode mode;
|
enum machine_mode mode;
|
rtx savepat, restpat;
|
rtx savepat, restpat;
|
rtx test_reg, test_mem;
|
rtx test_reg, test_mem;
|
rtx saveinsn, restinsn;
|
rtx saveinsn, restinsn;
|
|
|
/* First find all the registers that we need to deal with and all
|
/* First find all the registers that we need to deal with and all
|
the modes that they can have. If we can't find a mode to use,
|
the modes that they can have. If we can't find a mode to use,
|
we can't have the register live over calls. */
|
we can't have the register live over calls. */
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
{
|
{
|
if (call_used_regs[i] && ! call_fixed_regs[i])
|
if (call_used_regs[i] && ! call_fixed_regs[i])
|
{
|
{
|
for (j = 1; j <= MOVE_MAX_WORDS; j++)
|
for (j = 1; j <= MOVE_MAX_WORDS; j++)
|
{
|
{
|
regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j,
|
regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j,
|
VOIDmode);
|
VOIDmode);
|
if (regno_save_mode[i][j] == VOIDmode && j == 1)
|
if (regno_save_mode[i][j] == VOIDmode && j == 1)
|
{
|
{
|
call_fixed_regs[i] = 1;
|
call_fixed_regs[i] = 1;
|
SET_HARD_REG_BIT (call_fixed_reg_set, i);
|
SET_HARD_REG_BIT (call_fixed_reg_set, i);
|
}
|
}
|
}
|
}
|
}
|
}
|
else
|
else
|
regno_save_mode[i][1] = VOIDmode;
|
regno_save_mode[i][1] = VOIDmode;
|
}
|
}
|
|
|
/* The following code tries to approximate the conditions under which
|
/* The following code tries to approximate the conditions under which
|
we can easily save and restore a register without scratch registers or
|
we can easily save and restore a register without scratch registers or
|
other complexities. It will usually work, except under conditions where
|
other complexities. It will usually work, except under conditions where
|
the validity of an insn operand is dependent on the address offset.
|
the validity of an insn operand is dependent on the address offset.
|
No such cases are currently known.
|
No such cases are currently known.
|
|
|
We first find a typical offset from some BASE_REG_CLASS register.
|
We first find a typical offset from some BASE_REG_CLASS register.
|
This address is chosen by finding the first register in the class
|
This address is chosen by finding the first register in the class
|
and by finding the smallest power of two that is a valid offset from
|
and by finding the smallest power of two that is a valid offset from
|
that register in every mode we will use to save registers. */
|
that register in every mode we will use to save registers. */
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (TEST_HARD_REG_BIT
|
if (TEST_HARD_REG_BIT
|
(reg_class_contents
|
(reg_class_contents
|
[(int) base_reg_class (regno_save_mode [i][1], PLUS, CONST_INT)], i))
|
[(int) base_reg_class (regno_save_mode [i][1], PLUS, CONST_INT)], i))
|
break;
|
break;
|
|
|
gcc_assert (i < FIRST_PSEUDO_REGISTER);
|
gcc_assert (i < FIRST_PSEUDO_REGISTER);
|
|
|
addr_reg = gen_rtx_REG (Pmode, i);
|
addr_reg = gen_rtx_REG (Pmode, i);
|
|
|
for (offset = 1 << (HOST_BITS_PER_INT / 2); offset; offset >>= 1)
|
for (offset = 1 << (HOST_BITS_PER_INT / 2); offset; offset >>= 1)
|
{
|
{
|
address = gen_rtx_PLUS (Pmode, addr_reg, GEN_INT (offset));
|
address = gen_rtx_PLUS (Pmode, addr_reg, GEN_INT (offset));
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
if (regno_save_mode[i][1] != VOIDmode
|
if (regno_save_mode[i][1] != VOIDmode
|
&& ! strict_memory_address_p (regno_save_mode[i][1], address))
|
&& ! strict_memory_address_p (regno_save_mode[i][1], address))
|
break;
|
break;
|
|
|
if (i == FIRST_PSEUDO_REGISTER)
|
if (i == FIRST_PSEUDO_REGISTER)
|
break;
|
break;
|
}
|
}
|
|
|
/* If we didn't find a valid address, we must use register indirect. */
|
/* If we didn't find a valid address, we must use register indirect. */
|
if (offset == 0)
|
if (offset == 0)
|
address = addr_reg;
|
address = addr_reg;
|
|
|
/* Next we try to form an insn to save and restore the register. We
|
/* Next we try to form an insn to save and restore the register. We
|
see if such an insn is recognized and meets its constraints.
|
see if such an insn is recognized and meets its constraints.
|
|
|
To avoid lots of unnecessary RTL allocation, we construct all the RTL
|
To avoid lots of unnecessary RTL allocation, we construct all the RTL
|
once, then modify the memory and register operands in-place. */
|
once, then modify the memory and register operands in-place. */
|
|
|
test_reg = gen_rtx_REG (VOIDmode, 0);
|
test_reg = gen_rtx_REG (VOIDmode, 0);
|
test_mem = gen_rtx_MEM (VOIDmode, address);
|
test_mem = gen_rtx_MEM (VOIDmode, address);
|
savepat = gen_rtx_SET (VOIDmode, test_mem, test_reg);
|
savepat = gen_rtx_SET (VOIDmode, test_mem, test_reg);
|
restpat = gen_rtx_SET (VOIDmode, test_reg, test_mem);
|
restpat = gen_rtx_SET (VOIDmode, test_reg, test_mem);
|
|
|
saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, savepat, -1, 0, 0);
|
saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, savepat, -1, 0, 0);
|
restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, restpat, -1, 0, 0);
|
restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, restpat, -1, 0, 0);
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (mode = 0 ; mode < MAX_MACHINE_MODE; mode++)
|
for (mode = 0 ; mode < MAX_MACHINE_MODE; mode++)
|
if (HARD_REGNO_MODE_OK (i, mode))
|
if (HARD_REGNO_MODE_OK (i, mode))
|
{
|
{
|
int ok;
|
int ok;
|
|
|
/* Update the register number and modes of the register
|
/* Update the register number and modes of the register
|
and memory operand. */
|
and memory operand. */
|
REGNO (test_reg) = i;
|
REGNO (test_reg) = i;
|
PUT_MODE (test_reg, mode);
|
PUT_MODE (test_reg, mode);
|
PUT_MODE (test_mem, mode);
|
PUT_MODE (test_mem, mode);
|
|
|
/* Force re-recognition of the modified insns. */
|
/* Force re-recognition of the modified insns. */
|
INSN_CODE (saveinsn) = -1;
|
INSN_CODE (saveinsn) = -1;
|
INSN_CODE (restinsn) = -1;
|
INSN_CODE (restinsn) = -1;
|
|
|
reg_save_code[i][mode] = recog_memoized (saveinsn);
|
reg_save_code[i][mode] = recog_memoized (saveinsn);
|
reg_restore_code[i][mode] = recog_memoized (restinsn);
|
reg_restore_code[i][mode] = recog_memoized (restinsn);
|
|
|
/* Now extract both insns and see if we can meet their
|
/* Now extract both insns and see if we can meet their
|
constraints. */
|
constraints. */
|
ok = (reg_save_code[i][mode] != -1
|
ok = (reg_save_code[i][mode] != -1
|
&& reg_restore_code[i][mode] != -1);
|
&& reg_restore_code[i][mode] != -1);
|
if (ok)
|
if (ok)
|
{
|
{
|
extract_insn (saveinsn);
|
extract_insn (saveinsn);
|
ok = constrain_operands (1);
|
ok = constrain_operands (1);
|
extract_insn (restinsn);
|
extract_insn (restinsn);
|
ok &= constrain_operands (1);
|
ok &= constrain_operands (1);
|
}
|
}
|
|
|
if (! ok)
|
if (! ok)
|
{
|
{
|
reg_save_code[i][mode] = -1;
|
reg_save_code[i][mode] = -1;
|
reg_restore_code[i][mode] = -1;
|
reg_restore_code[i][mode] = -1;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
reg_save_code[i][mode] = -1;
|
reg_save_code[i][mode] = -1;
|
reg_restore_code[i][mode] = -1;
|
reg_restore_code[i][mode] = -1;
|
}
|
}
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (j = 1; j <= MOVE_MAX_WORDS; j++)
|
for (j = 1; j <= MOVE_MAX_WORDS; j++)
|
if (reg_save_code [i][regno_save_mode[i][j]] == -1)
|
if (reg_save_code [i][regno_save_mode[i][j]] == -1)
|
{
|
{
|
regno_save_mode[i][j] = VOIDmode;
|
regno_save_mode[i][j] = VOIDmode;
|
if (j == 1)
|
if (j == 1)
|
{
|
{
|
call_fixed_regs[i] = 1;
|
call_fixed_regs[i] = 1;
|
SET_HARD_REG_BIT (call_fixed_reg_set, i);
|
SET_HARD_REG_BIT (call_fixed_reg_set, i);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Initialize save areas by showing that we haven't allocated any yet. */
|
/* Initialize save areas by showing that we haven't allocated any yet. */
|
|
|
void
|
void
|
init_save_areas (void)
|
init_save_areas (void)
|
{
|
{
|
int i, j;
|
int i, j;
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (j = 1; j <= MOVE_MAX_WORDS; j++)
|
for (j = 1; j <= MOVE_MAX_WORDS; j++)
|
regno_save_mem[i][j] = 0;
|
regno_save_mem[i][j] = 0;
|
}
|
}
|
|
|
/* Allocate save areas for any hard registers that might need saving.
|
/* Allocate save areas for any hard registers that might need saving.
|
We take a conservative approach here and look for call-clobbered hard
|
We take a conservative approach here and look for call-clobbered hard
|
registers that are assigned to pseudos that cross calls. This may
|
registers that are assigned to pseudos that cross calls. This may
|
overestimate slightly (especially if some of these registers are later
|
overestimate slightly (especially if some of these registers are later
|
used as spill registers), but it should not be significant.
|
used as spill registers), but it should not be significant.
|
|
|
Future work:
|
Future work:
|
|
|
In the fallback case we should iterate backwards across all possible
|
In the fallback case we should iterate backwards across all possible
|
modes for the save, choosing the largest available one instead of
|
modes for the save, choosing the largest available one instead of
|
falling back to the smallest mode immediately. (eg TF -> DF -> SF).
|
falling back to the smallest mode immediately. (eg TF -> DF -> SF).
|
|
|
We do not try to use "move multiple" instructions that exist
|
We do not try to use "move multiple" instructions that exist
|
on some machines (such as the 68k moveml). It could be a win to try
|
on some machines (such as the 68k moveml). It could be a win to try
|
and use them when possible. The hard part is doing it in a way that is
|
and use them when possible. The hard part is doing it in a way that is
|
machine independent since they might be saving non-consecutive
|
machine independent since they might be saving non-consecutive
|
registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */
|
registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */
|
|
|
void
|
void
|
setup_save_areas (void)
|
setup_save_areas (void)
|
{
|
{
|
int i, j, k;
|
int i, j, k;
|
unsigned int r;
|
unsigned int r;
|
HARD_REG_SET hard_regs_used;
|
HARD_REG_SET hard_regs_used;
|
|
|
/* Allocate space in the save area for the largest multi-register
|
/* Allocate space in the save area for the largest multi-register
|
pseudos first, then work backwards to single register
|
pseudos first, then work backwards to single register
|
pseudos. */
|
pseudos. */
|
|
|
/* Find and record all call-used hard-registers in this function. */
|
/* Find and record all call-used hard-registers in this function. */
|
CLEAR_HARD_REG_SET (hard_regs_used);
|
CLEAR_HARD_REG_SET (hard_regs_used);
|
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
|
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
|
if (reg_renumber[i] >= 0 && REG_N_CALLS_CROSSED (i) > 0)
|
if (reg_renumber[i] >= 0 && REG_N_CALLS_CROSSED (i) > 0)
|
{
|
{
|
unsigned int regno = reg_renumber[i];
|
unsigned int regno = reg_renumber[i];
|
unsigned int endregno
|
unsigned int endregno
|
= regno + hard_regno_nregs[regno][GET_MODE (regno_reg_rtx[i])];
|
= regno + hard_regno_nregs[regno][GET_MODE (regno_reg_rtx[i])];
|
|
|
for (r = regno; r < endregno; r++)
|
for (r = regno; r < endregno; r++)
|
if (call_used_regs[r])
|
if (call_used_regs[r])
|
SET_HARD_REG_BIT (hard_regs_used, r);
|
SET_HARD_REG_BIT (hard_regs_used, r);
|
}
|
}
|
|
|
/* Now run through all the call-used hard-registers and allocate
|
/* Now run through all the call-used hard-registers and allocate
|
space for them in the caller-save area. Try to allocate space
|
space for them in the caller-save area. Try to allocate space
|
in a manner which allows multi-register saves/restores to be done. */
|
in a manner which allows multi-register saves/restores to be done. */
|
|
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (j = MOVE_MAX_WORDS; j > 0; j--)
|
for (j = MOVE_MAX_WORDS; j > 0; j--)
|
{
|
{
|
int do_save = 1;
|
int do_save = 1;
|
|
|
/* If no mode exists for this size, try another. Also break out
|
/* If no mode exists for this size, try another. Also break out
|
if we have already saved this hard register. */
|
if we have already saved this hard register. */
|
if (regno_save_mode[i][j] == VOIDmode || regno_save_mem[i][1] != 0)
|
if (regno_save_mode[i][j] == VOIDmode || regno_save_mem[i][1] != 0)
|
continue;
|
continue;
|
|
|
/* See if any register in this group has been saved. */
|
/* See if any register in this group has been saved. */
|
for (k = 0; k < j; k++)
|
for (k = 0; k < j; k++)
|
if (regno_save_mem[i + k][1])
|
if (regno_save_mem[i + k][1])
|
{
|
{
|
do_save = 0;
|
do_save = 0;
|
break;
|
break;
|
}
|
}
|
if (! do_save)
|
if (! do_save)
|
continue;
|
continue;
|
|
|
for (k = 0; k < j; k++)
|
for (k = 0; k < j; k++)
|
if (! TEST_HARD_REG_BIT (hard_regs_used, i + k))
|
if (! TEST_HARD_REG_BIT (hard_regs_used, i + k))
|
{
|
{
|
do_save = 0;
|
do_save = 0;
|
break;
|
break;
|
}
|
}
|
if (! do_save)
|
if (! do_save)
|
continue;
|
continue;
|
|
|
/* We have found an acceptable mode to store in. */
|
/* We have found an acceptable mode to store in. */
|
regno_save_mem[i][j]
|
regno_save_mem[i][j]
|
= assign_stack_local (regno_save_mode[i][j],
|
= assign_stack_local (regno_save_mode[i][j],
|
GET_MODE_SIZE (regno_save_mode[i][j]), 0);
|
GET_MODE_SIZE (regno_save_mode[i][j]), 0);
|
|
|
/* Setup single word save area just in case... */
|
/* Setup single word save area just in case... */
|
for (k = 0; k < j; k++)
|
for (k = 0; k < j; k++)
|
/* This should not depend on WORDS_BIG_ENDIAN.
|
/* This should not depend on WORDS_BIG_ENDIAN.
|
The order of words in regs is the same as in memory. */
|
The order of words in regs is the same as in memory. */
|
regno_save_mem[i + k][1]
|
regno_save_mem[i + k][1]
|
= adjust_address_nv (regno_save_mem[i][j],
|
= adjust_address_nv (regno_save_mem[i][j],
|
regno_save_mode[i + k][1],
|
regno_save_mode[i + k][1],
|
k * UNITS_PER_WORD);
|
k * UNITS_PER_WORD);
|
}
|
}
|
|
|
/* Now loop again and set the alias set of any save areas we made to
|
/* Now loop again and set the alias set of any save areas we made to
|
the alias set used to represent frame objects. */
|
the alias set used to represent frame objects. */
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
|
for (j = MOVE_MAX_WORDS; j > 0; j--)
|
for (j = MOVE_MAX_WORDS; j > 0; j--)
|
if (regno_save_mem[i][j] != 0)
|
if (regno_save_mem[i][j] != 0)
|
set_mem_alias_set (regno_save_mem[i][j], get_frame_alias_set ());
|
set_mem_alias_set (regno_save_mem[i][j], get_frame_alias_set ());
|
}
|
}
|
|
|
/* Find the places where hard regs are live across calls and save them. */
|
/* Find the places where hard regs are live across calls and save them. */
|
|
|
void
|
void
|
save_call_clobbered_regs (void)
|
save_call_clobbered_regs (void)
|
{
|
{
|
struct insn_chain *chain, *next;
|
struct insn_chain *chain, *next;
|
enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
|
enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
|
|
|
/* Computed in mark_set_regs, holds all registers set by the current
|
/* Computed in mark_set_regs, holds all registers set by the current
|
instruction. */
|
instruction. */
|
HARD_REG_SET this_insn_sets;
|
HARD_REG_SET this_insn_sets;
|
|
|
CLEAR_HARD_REG_SET (hard_regs_saved);
|
CLEAR_HARD_REG_SET (hard_regs_saved);
|
n_regs_saved = 0;
|
n_regs_saved = 0;
|
|
|
for (chain = reload_insn_chain; chain != 0; chain = next)
|
for (chain = reload_insn_chain; chain != 0; chain = next)
|
{
|
{
|
rtx insn = chain->insn;
|
rtx insn = chain->insn;
|
enum rtx_code code = GET_CODE (insn);
|
enum rtx_code code = GET_CODE (insn);
|
|
|
next = chain->next;
|
next = chain->next;
|
|
|
gcc_assert (!chain->is_caller_save_insn);
|
gcc_assert (!chain->is_caller_save_insn);
|
|
|
if (INSN_P (insn))
|
if (INSN_P (insn))
|
{
|
{
|
/* If some registers have been saved, see if INSN references
|
/* If some registers have been saved, see if INSN references
|
any of them. We must restore them before the insn if so. */
|
any of them. We must restore them before the insn if so. */
|
|
|
if (n_regs_saved)
|
if (n_regs_saved)
|
{
|
{
|
int regno;
|
int regno;
|
|
|
if (code == JUMP_INSN)
|
if (code == JUMP_INSN)
|
/* Restore all registers if this is a JUMP_INSN. */
|
/* Restore all registers if this is a JUMP_INSN. */
|
COPY_HARD_REG_SET (referenced_regs, hard_regs_saved);
|
COPY_HARD_REG_SET (referenced_regs, hard_regs_saved);
|
else
|
else
|
{
|
{
|
CLEAR_HARD_REG_SET (referenced_regs);
|
CLEAR_HARD_REG_SET (referenced_regs);
|
mark_referenced_regs (PATTERN (insn));
|
mark_referenced_regs (PATTERN (insn));
|
AND_HARD_REG_SET (referenced_regs, hard_regs_saved);
|
AND_HARD_REG_SET (referenced_regs, hard_regs_saved);
|
}
|
}
|
|
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
if (TEST_HARD_REG_BIT (referenced_regs, regno))
|
if (TEST_HARD_REG_BIT (referenced_regs, regno))
|
regno += insert_restore (chain, 1, regno, MOVE_MAX_WORDS, save_mode);
|
regno += insert_restore (chain, 1, regno, MOVE_MAX_WORDS, save_mode);
|
}
|
}
|
|
|
if (code == CALL_INSN && ! find_reg_note (insn, REG_NORETURN, NULL))
|
if (code == CALL_INSN && ! find_reg_note (insn, REG_NORETURN, NULL))
|
{
|
{
|
unsigned regno;
|
unsigned regno;
|
HARD_REG_SET hard_regs_to_save;
|
HARD_REG_SET hard_regs_to_save;
|
reg_set_iterator rsi;
|
reg_set_iterator rsi;
|
|
|
/* Use the register life information in CHAIN to compute which
|
/* Use the register life information in CHAIN to compute which
|
regs are live during the call. */
|
regs are live during the call. */
|
REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
|
REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
|
&chain->live_throughout);
|
&chain->live_throughout);
|
/* Save hard registers always in the widest mode available. */
|
/* Save hard registers always in the widest mode available. */
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
|
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
|
save_mode [regno] = regno_save_mode [regno][1];
|
save_mode [regno] = regno_save_mode [regno][1];
|
else
|
else
|
save_mode [regno] = VOIDmode;
|
save_mode [regno] = VOIDmode;
|
|
|
/* Look through all live pseudos, mark their hard registers
|
/* Look through all live pseudos, mark their hard registers
|
and choose proper mode for saving. */
|
and choose proper mode for saving. */
|
EXECUTE_IF_SET_IN_REG_SET
|
EXECUTE_IF_SET_IN_REG_SET
|
(&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi)
|
(&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi)
|
{
|
{
|
int r = reg_renumber[regno];
|
int r = reg_renumber[regno];
|
int nregs;
|
int nregs;
|
enum machine_mode mode;
|
enum machine_mode mode;
|
|
|
gcc_assert (r >= 0);
|
gcc_assert (r >= 0);
|
nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
|
nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
|
mode = HARD_REGNO_CALLER_SAVE_MODE
|
mode = HARD_REGNO_CALLER_SAVE_MODE
|
(r, nregs, PSEUDO_REGNO_MODE (regno));
|
(r, nregs, PSEUDO_REGNO_MODE (regno));
|
if (GET_MODE_BITSIZE (mode)
|
if (GET_MODE_BITSIZE (mode)
|
> GET_MODE_BITSIZE (save_mode[r]))
|
> GET_MODE_BITSIZE (save_mode[r]))
|
save_mode[r] = mode;
|
save_mode[r] = mode;
|
while (nregs-- > 0)
|
while (nregs-- > 0)
|
SET_HARD_REG_BIT (hard_regs_to_save, r + nregs);
|
SET_HARD_REG_BIT (hard_regs_to_save, r + nregs);
|
}
|
}
|
|
|
/* Record all registers set in this call insn. These don't need
|
/* Record all registers set in this call insn. These don't need
|
to be saved. N.B. the call insn might set a subreg of a
|
to be saved. N.B. the call insn might set a subreg of a
|
multi-hard-reg pseudo; then the pseudo is considered live
|
multi-hard-reg pseudo; then the pseudo is considered live
|
during the call, but the subreg that is set isn't. */
|
during the call, but the subreg that is set isn't. */
|
CLEAR_HARD_REG_SET (this_insn_sets);
|
CLEAR_HARD_REG_SET (this_insn_sets);
|
note_stores (PATTERN (insn), mark_set_regs, &this_insn_sets);
|
note_stores (PATTERN (insn), mark_set_regs, &this_insn_sets);
|
/* Sibcalls are considered to set the return value,
|
/* Sibcalls are considered to set the return value,
|
compare flow.c:propagate_one_insn. */
|
compare flow.c:propagate_one_insn. */
|
if (SIBLING_CALL_P (insn) && current_function_return_rtx)
|
if (SIBLING_CALL_P (insn) && current_function_return_rtx)
|
mark_set_regs (current_function_return_rtx, NULL_RTX,
|
mark_set_regs (current_function_return_rtx, NULL_RTX,
|
&this_insn_sets);
|
&this_insn_sets);
|
|
|
/* Compute which hard regs must be saved before this call. */
|
/* Compute which hard regs must be saved before this call. */
|
AND_COMPL_HARD_REG_SET (hard_regs_to_save, call_fixed_reg_set);
|
AND_COMPL_HARD_REG_SET (hard_regs_to_save, call_fixed_reg_set);
|
AND_COMPL_HARD_REG_SET (hard_regs_to_save, this_insn_sets);
|
AND_COMPL_HARD_REG_SET (hard_regs_to_save, this_insn_sets);
|
AND_COMPL_HARD_REG_SET (hard_regs_to_save, hard_regs_saved);
|
AND_COMPL_HARD_REG_SET (hard_regs_to_save, hard_regs_saved);
|
AND_HARD_REG_SET (hard_regs_to_save, call_used_reg_set);
|
AND_HARD_REG_SET (hard_regs_to_save, call_used_reg_set);
|
|
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
|
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
|
regno += insert_save (chain, 1, regno, &hard_regs_to_save, save_mode);
|
regno += insert_save (chain, 1, regno, &hard_regs_to_save, save_mode);
|
|
|
/* Must recompute n_regs_saved. */
|
/* Must recompute n_regs_saved. */
|
n_regs_saved = 0;
|
n_regs_saved = 0;
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
|
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
|
n_regs_saved++;
|
n_regs_saved++;
|
}
|
}
|
}
|
}
|
|
|
if (chain->next == 0 || chain->next->block > chain->block)
|
if (chain->next == 0 || chain->next->block > chain->block)
|
{
|
{
|
int regno;
|
int regno;
|
/* At the end of the basic block, we must restore any registers that
|
/* At the end of the basic block, we must restore any registers that
|
remain saved. If the last insn in the block is a JUMP_INSN, put
|
remain saved. If the last insn in the block is a JUMP_INSN, put
|
the restore before the insn, otherwise, put it after the insn. */
|
the restore before the insn, otherwise, put it after the insn. */
|
|
|
if (n_regs_saved)
|
if (n_regs_saved)
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
|
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
|
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
|
regno += insert_restore (chain, JUMP_P (insn),
|
regno += insert_restore (chain, JUMP_P (insn),
|
regno, MOVE_MAX_WORDS, save_mode);
|
regno, MOVE_MAX_WORDS, save_mode);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Here from note_stores, or directly from save_call_clobbered_regs, when
|
/* Here from note_stores, or directly from save_call_clobbered_regs, when
|
an insn stores a value in a register.
|
an insn stores a value in a register.
|
Set the proper bit or bits in this_insn_sets. All pseudos that have
|
Set the proper bit or bits in this_insn_sets. All pseudos that have
|
been assigned hard regs have had their register number changed already,
|
been assigned hard regs have had their register number changed already,
|
so we can ignore pseudos. */
|
so we can ignore pseudos. */
|
static void
|
static void
|
mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *data)
|
mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *data)
|
{
|
{
|
int regno, endregno, i;
|
int regno, endregno, i;
|
enum machine_mode mode = GET_MODE (reg);
|
enum machine_mode mode = GET_MODE (reg);
|
HARD_REG_SET *this_insn_sets = data;
|
HARD_REG_SET *this_insn_sets = data;
|
|
|
if (GET_CODE (reg) == SUBREG)
|
if (GET_CODE (reg) == SUBREG)
|
{
|
{
|
rtx inner = SUBREG_REG (reg);
|
rtx inner = SUBREG_REG (reg);
|
if (!REG_P (inner) || REGNO (inner) >= FIRST_PSEUDO_REGISTER)
|
if (!REG_P (inner) || REGNO (inner) >= FIRST_PSEUDO_REGISTER)
|
return;
|
return;
|
regno = subreg_regno (reg);
|
regno = subreg_regno (reg);
|
}
|
}
|
else if (REG_P (reg)
|
else if (REG_P (reg)
|
&& REGNO (reg) < FIRST_PSEUDO_REGISTER)
|
&& REGNO (reg) < FIRST_PSEUDO_REGISTER)
|
regno = REGNO (reg);
|
regno = REGNO (reg);
|
else
|
else
|
return;
|
return;
|
|
|
endregno = regno + hard_regno_nregs[regno][mode];
|
endregno = regno + hard_regno_nregs[regno][mode];
|
|
|
for (i = regno; i < endregno; i++)
|
for (i = regno; i < endregno; i++)
|
SET_HARD_REG_BIT (*this_insn_sets, i);
|
SET_HARD_REG_BIT (*this_insn_sets, i);
|
}
|
}
|
|
|
/* Here from note_stores when an insn stores a value in a register.
|
/* Here from note_stores when an insn stores a value in a register.
|
Set the proper bit or bits in the passed regset. All pseudos that have
|
Set the proper bit or bits in the passed regset. All pseudos that have
|
been assigned hard regs have had their register number changed already,
|
been assigned hard regs have had their register number changed already,
|
so we can ignore pseudos. */
|
so we can ignore pseudos. */
|
static void
|
static void
|
add_stored_regs (rtx reg, rtx setter, void *data)
|
add_stored_regs (rtx reg, rtx setter, void *data)
|
{
|
{
|
int regno, endregno, i;
|
int regno, endregno, i;
|
enum machine_mode mode = GET_MODE (reg);
|
enum machine_mode mode = GET_MODE (reg);
|
int offset = 0;
|
int offset = 0;
|
|
|
if (GET_CODE (setter) == CLOBBER)
|
if (GET_CODE (setter) == CLOBBER)
|
return;
|
return;
|
|
|
if (GET_CODE (reg) == SUBREG && REG_P (SUBREG_REG (reg)))
|
if (GET_CODE (reg) == SUBREG && REG_P (SUBREG_REG (reg)))
|
{
|
{
|
offset = subreg_regno_offset (REGNO (SUBREG_REG (reg)),
|
offset = subreg_regno_offset (REGNO (SUBREG_REG (reg)),
|
GET_MODE (SUBREG_REG (reg)),
|
GET_MODE (SUBREG_REG (reg)),
|
SUBREG_BYTE (reg),
|
SUBREG_BYTE (reg),
|
GET_MODE (reg));
|
GET_MODE (reg));
|
reg = SUBREG_REG (reg);
|
reg = SUBREG_REG (reg);
|
}
|
}
|
|
|
if (!REG_P (reg) || REGNO (reg) >= FIRST_PSEUDO_REGISTER)
|
if (!REG_P (reg) || REGNO (reg) >= FIRST_PSEUDO_REGISTER)
|
return;
|
return;
|
|
|
regno = REGNO (reg) + offset;
|
regno = REGNO (reg) + offset;
|
endregno = regno + hard_regno_nregs[regno][mode];
|
endregno = regno + hard_regno_nregs[regno][mode];
|
|
|
for (i = regno; i < endregno; i++)
|
for (i = regno; i < endregno; i++)
|
SET_REGNO_REG_SET ((regset) data, i);
|
SET_REGNO_REG_SET ((regset) data, i);
|
}
|
}
|
|
|
/* Walk X and record all referenced registers in REFERENCED_REGS. */
|
/* Walk X and record all referenced registers in REFERENCED_REGS. */
|
static void
|
static void
|
mark_referenced_regs (rtx x)
|
mark_referenced_regs (rtx x)
|
{
|
{
|
enum rtx_code code = GET_CODE (x);
|
enum rtx_code code = GET_CODE (x);
|
const char *fmt;
|
const char *fmt;
|
int i, j;
|
int i, j;
|
|
|
if (code == SET)
|
if (code == SET)
|
mark_referenced_regs (SET_SRC (x));
|
mark_referenced_regs (SET_SRC (x));
|
if (code == SET || code == CLOBBER)
|
if (code == SET || code == CLOBBER)
|
{
|
{
|
x = SET_DEST (x);
|
x = SET_DEST (x);
|
code = GET_CODE (x);
|
code = GET_CODE (x);
|
if ((code == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
|
if ((code == REG && REGNO (x) < FIRST_PSEUDO_REGISTER)
|
|| code == PC || code == CC0
|
|| code == PC || code == CC0
|
|| (code == SUBREG && REG_P (SUBREG_REG (x))
|
|| (code == SUBREG && REG_P (SUBREG_REG (x))
|
&& REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER
|
&& REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER
|
/* If we're setting only part of a multi-word register,
|
/* If we're setting only part of a multi-word register,
|
we shall mark it as referenced, because the words
|
we shall mark it as referenced, because the words
|
that are not being set should be restored. */
|
that are not being set should be restored. */
|
&& ((GET_MODE_SIZE (GET_MODE (x))
|
&& ((GET_MODE_SIZE (GET_MODE (x))
|
>= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))
|
>= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))
|
|| (GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))
|
|| (GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))
|
<= UNITS_PER_WORD))))
|
<= UNITS_PER_WORD))))
|
return;
|
return;
|
}
|
}
|
if (code == MEM || code == SUBREG)
|
if (code == MEM || code == SUBREG)
|
{
|
{
|
x = XEXP (x, 0);
|
x = XEXP (x, 0);
|
code = GET_CODE (x);
|
code = GET_CODE (x);
|
}
|
}
|
|
|
if (code == REG)
|
if (code == REG)
|
{
|
{
|
int regno = REGNO (x);
|
int regno = REGNO (x);
|
int hardregno = (regno < FIRST_PSEUDO_REGISTER ? regno
|
int hardregno = (regno < FIRST_PSEUDO_REGISTER ? regno
|
: reg_renumber[regno]);
|
: reg_renumber[regno]);
|
|
|
if (hardregno >= 0)
|
if (hardregno >= 0)
|
{
|
{
|
int nregs = hard_regno_nregs[hardregno][GET_MODE (x)];
|
int nregs = hard_regno_nregs[hardregno][GET_MODE (x)];
|
while (nregs-- > 0)
|
while (nregs-- > 0)
|
SET_HARD_REG_BIT (referenced_regs, hardregno + nregs);
|
SET_HARD_REG_BIT (referenced_regs, hardregno + nregs);
|
}
|
}
|
/* If this is a pseudo that did not get a hard register, scan its
|
/* If this is a pseudo that did not get a hard register, scan its
|
memory location, since it might involve the use of another
|
memory location, since it might involve the use of another
|
register, which might be saved. */
|
register, which might be saved. */
|
else if (reg_equiv_mem[regno] != 0)
|
else if (reg_equiv_mem[regno] != 0)
|
mark_referenced_regs (XEXP (reg_equiv_mem[regno], 0));
|
mark_referenced_regs (XEXP (reg_equiv_mem[regno], 0));
|
else if (reg_equiv_address[regno] != 0)
|
else if (reg_equiv_address[regno] != 0)
|
mark_referenced_regs (reg_equiv_address[regno]);
|
mark_referenced_regs (reg_equiv_address[regno]);
|
return;
|
return;
|
}
|
}
|
|
|
fmt = GET_RTX_FORMAT (code);
|
fmt = GET_RTX_FORMAT (code);
|
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')
|
mark_referenced_regs (XEXP (x, i));
|
mark_referenced_regs (XEXP (x, i));
|
else if (fmt[i] == 'E')
|
else if (fmt[i] == 'E')
|
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
|
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
|
mark_referenced_regs (XVECEXP (x, i, j));
|
mark_referenced_regs (XVECEXP (x, i, j));
|
}
|
}
|
}
|
}
|
|
|
/* Insert a sequence of insns to restore. Place these insns in front of
|
/* Insert a sequence of insns to restore. Place these insns in front of
|
CHAIN if BEFORE_P is nonzero, behind the insn otherwise. MAXRESTORE is
|
CHAIN if BEFORE_P is nonzero, behind the insn otherwise. MAXRESTORE is
|
the maximum number of registers which should be restored during this call.
|
the maximum number of registers which should be restored during this call.
|
It should never be less than 1 since we only work with entire registers.
|
It should never be less than 1 since we only work with entire registers.
|
|
|
Note that we have verified in init_caller_save that we can do this
|
Note that we have verified in init_caller_save that we can do this
|
with a simple SET, so use it. Set INSN_CODE to what we save there
|
with a simple SET, so use it. Set INSN_CODE to what we save there
|
since the address might not be valid so the insn might not be recognized.
|
since the address might not be valid so the insn might not be recognized.
|
These insns will be reloaded and have register elimination done by
|
These insns will be reloaded and have register elimination done by
|
find_reload, so we need not worry about that here.
|
find_reload, so we need not worry about that here.
|
|
|
Return the extra number of registers saved. */
|
Return the extra number of registers saved. */
|
|
|
static int
|
static int
|
insert_restore (struct insn_chain *chain, int before_p, int regno,
|
insert_restore (struct insn_chain *chain, int before_p, int regno,
|
int maxrestore, enum machine_mode *save_mode)
|
int maxrestore, enum machine_mode *save_mode)
|
{
|
{
|
int i, k;
|
int i, k;
|
rtx pat = NULL_RTX;
|
rtx pat = NULL_RTX;
|
int code;
|
int code;
|
unsigned int numregs = 0;
|
unsigned int numregs = 0;
|
struct insn_chain *new;
|
struct insn_chain *new;
|
rtx mem;
|
rtx mem;
|
|
|
/* A common failure mode if register status is not correct in the
|
/* A common failure mode if register status is not correct in the
|
RTL is for this routine to be called with a REGNO we didn't
|
RTL is for this routine to be called with a REGNO we didn't
|
expect to save. That will cause us to write an insn with a (nil)
|
expect to save. That will cause us to write an insn with a (nil)
|
SET_DEST or SET_SRC. Instead of doing so and causing a crash
|
SET_DEST or SET_SRC. Instead of doing so and causing a crash
|
later, check for this common case here instead. This will remove
|
later, check for this common case here instead. This will remove
|
one step in debugging such problems. */
|
one step in debugging such problems. */
|
gcc_assert (regno_save_mem[regno][1]);
|
gcc_assert (regno_save_mem[regno][1]);
|
|
|
/* Get the pattern to emit and update our status.
|
/* Get the pattern to emit and update our status.
|
|
|
See if we can restore `maxrestore' registers at once. Work
|
See if we can restore `maxrestore' registers at once. Work
|
backwards to the single register case. */
|
backwards to the single register case. */
|
for (i = maxrestore; i > 0; i--)
|
for (i = maxrestore; i > 0; i--)
|
{
|
{
|
int j;
|
int j;
|
int ok = 1;
|
int ok = 1;
|
|
|
if (regno_save_mem[regno][i] == 0)
|
if (regno_save_mem[regno][i] == 0)
|
continue;
|
continue;
|
|
|
for (j = 0; j < i; j++)
|
for (j = 0; j < i; j++)
|
if (! TEST_HARD_REG_BIT (hard_regs_saved, regno + j))
|
if (! TEST_HARD_REG_BIT (hard_regs_saved, regno + j))
|
{
|
{
|
ok = 0;
|
ok = 0;
|
break;
|
break;
|
}
|
}
|
/* Must do this one restore at a time. */
|
/* Must do this one restore at a time. */
|
if (! ok)
|
if (! ok)
|
continue;
|
continue;
|
|
|
numregs = i;
|
numregs = i;
|
break;
|
break;
|
}
|
}
|
|
|
mem = regno_save_mem [regno][numregs];
|
mem = regno_save_mem [regno][numregs];
|
if (save_mode [regno] != VOIDmode
|
if (save_mode [regno] != VOIDmode
|
&& save_mode [regno] != GET_MODE (mem)
|
&& save_mode [regno] != GET_MODE (mem)
|
&& numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]])
|
&& numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]])
|
mem = adjust_address (mem, save_mode[regno], 0);
|
mem = adjust_address (mem, save_mode[regno], 0);
|
else
|
else
|
mem = copy_rtx (mem);
|
mem = copy_rtx (mem);
|
pat = gen_rtx_SET (VOIDmode,
|
pat = gen_rtx_SET (VOIDmode,
|
gen_rtx_REG (GET_MODE (mem),
|
gen_rtx_REG (GET_MODE (mem),
|
regno), mem);
|
regno), mem);
|
code = reg_restore_code[regno][GET_MODE (mem)];
|
code = reg_restore_code[regno][GET_MODE (mem)];
|
new = insert_one_insn (chain, before_p, code, pat);
|
new = insert_one_insn (chain, before_p, code, pat);
|
|
|
/* Clear status for all registers we restored. */
|
/* Clear status for all registers we restored. */
|
for (k = 0; k < i; k++)
|
for (k = 0; k < i; k++)
|
{
|
{
|
CLEAR_HARD_REG_BIT (hard_regs_saved, regno + k);
|
CLEAR_HARD_REG_BIT (hard_regs_saved, regno + k);
|
SET_REGNO_REG_SET (&new->dead_or_set, regno + k);
|
SET_REGNO_REG_SET (&new->dead_or_set, regno + k);
|
n_regs_saved--;
|
n_regs_saved--;
|
}
|
}
|
|
|
/* Tell our callers how many extra registers we saved/restored. */
|
/* Tell our callers how many extra registers we saved/restored. */
|
return numregs - 1;
|
return numregs - 1;
|
}
|
}
|
|
|
/* Like insert_restore above, but save registers instead. */
|
/* Like insert_restore above, but save registers instead. */
|
|
|
static int
|
static int
|
insert_save (struct insn_chain *chain, int before_p, int regno,
|
insert_save (struct insn_chain *chain, int before_p, int regno,
|
HARD_REG_SET (*to_save), enum machine_mode *save_mode)
|
HARD_REG_SET (*to_save), enum machine_mode *save_mode)
|
{
|
{
|
int i;
|
int i;
|
unsigned int k;
|
unsigned int k;
|
rtx pat = NULL_RTX;
|
rtx pat = NULL_RTX;
|
int code;
|
int code;
|
unsigned int numregs = 0;
|
unsigned int numregs = 0;
|
struct insn_chain *new;
|
struct insn_chain *new;
|
rtx mem;
|
rtx mem;
|
|
|
/* A common failure mode if register status is not correct in the
|
/* A common failure mode if register status is not correct in the
|
RTL is for this routine to be called with a REGNO we didn't
|
RTL is for this routine to be called with a REGNO we didn't
|
expect to save. That will cause us to write an insn with a (nil)
|
expect to save. That will cause us to write an insn with a (nil)
|
SET_DEST or SET_SRC. Instead of doing so and causing a crash
|
SET_DEST or SET_SRC. Instead of doing so and causing a crash
|
later, check for this common case here. This will remove one
|
later, check for this common case here. This will remove one
|
step in debugging such problems. */
|
step in debugging such problems. */
|
gcc_assert (regno_save_mem[regno][1]);
|
gcc_assert (regno_save_mem[regno][1]);
|
|
|
/* Get the pattern to emit and update our status.
|
/* Get the pattern to emit and update our status.
|
|
|
See if we can save several registers with a single instruction.
|
See if we can save several registers with a single instruction.
|
Work backwards to the single register case. */
|
Work backwards to the single register case. */
|
for (i = MOVE_MAX_WORDS; i > 0; i--)
|
for (i = MOVE_MAX_WORDS; i > 0; i--)
|
{
|
{
|
int j;
|
int j;
|
int ok = 1;
|
int ok = 1;
|
if (regno_save_mem[regno][i] == 0)
|
if (regno_save_mem[regno][i] == 0)
|
continue;
|
continue;
|
|
|
for (j = 0; j < i; j++)
|
for (j = 0; j < i; j++)
|
if (! TEST_HARD_REG_BIT (*to_save, regno + j))
|
if (! TEST_HARD_REG_BIT (*to_save, regno + j))
|
{
|
{
|
ok = 0;
|
ok = 0;
|
break;
|
break;
|
}
|
}
|
/* Must do this one save at a time. */
|
/* Must do this one save at a time. */
|
if (! ok)
|
if (! ok)
|
continue;
|
continue;
|
|
|
numregs = i;
|
numregs = i;
|
break;
|
break;
|
}
|
}
|
|
|
mem = regno_save_mem [regno][numregs];
|
mem = regno_save_mem [regno][numregs];
|
if (save_mode [regno] != VOIDmode
|
if (save_mode [regno] != VOIDmode
|
&& save_mode [regno] != GET_MODE (mem)
|
&& save_mode [regno] != GET_MODE (mem)
|
&& numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]])
|
&& numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]])
|
mem = adjust_address (mem, save_mode[regno], 0);
|
mem = adjust_address (mem, save_mode[regno], 0);
|
else
|
else
|
mem = copy_rtx (mem);
|
mem = copy_rtx (mem);
|
pat = gen_rtx_SET (VOIDmode, mem,
|
pat = gen_rtx_SET (VOIDmode, mem,
|
gen_rtx_REG (GET_MODE (mem),
|
gen_rtx_REG (GET_MODE (mem),
|
regno));
|
regno));
|
code = reg_save_code[regno][GET_MODE (mem)];
|
code = reg_save_code[regno][GET_MODE (mem)];
|
new = insert_one_insn (chain, before_p, code, pat);
|
new = insert_one_insn (chain, before_p, code, pat);
|
|
|
/* Set hard_regs_saved and dead_or_set for all the registers we saved. */
|
/* Set hard_regs_saved and dead_or_set for all the registers we saved. */
|
for (k = 0; k < numregs; k++)
|
for (k = 0; k < numregs; k++)
|
{
|
{
|
SET_HARD_REG_BIT (hard_regs_saved, regno + k);
|
SET_HARD_REG_BIT (hard_regs_saved, regno + k);
|
SET_REGNO_REG_SET (&new->dead_or_set, regno + k);
|
SET_REGNO_REG_SET (&new->dead_or_set, regno + k);
|
n_regs_saved++;
|
n_regs_saved++;
|
}
|
}
|
|
|
/* Tell our callers how many extra registers we saved/restored. */
|
/* Tell our callers how many extra registers we saved/restored. */
|
return numregs - 1;
|
return numregs - 1;
|
}
|
}
|
|
|
/* Emit a new caller-save insn and set the code. */
|
/* Emit a new caller-save insn and set the code. */
|
static struct insn_chain *
|
static struct insn_chain *
|
insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx pat)
|
insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx pat)
|
{
|
{
|
rtx insn = chain->insn;
|
rtx insn = chain->insn;
|
struct insn_chain *new;
|
struct insn_chain *new;
|
|
|
#ifdef HAVE_cc0
|
#ifdef HAVE_cc0
|
/* If INSN references CC0, put our insns in front of the insn that sets
|
/* If INSN references CC0, put our insns in front of the insn that sets
|
CC0. This is always safe, since the only way we could be passed an
|
CC0. This is always safe, since the only way we could be passed an
|
insn that references CC0 is for a restore, and doing a restore earlier
|
insn that references CC0 is for a restore, and doing a restore earlier
|
isn't a problem. We do, however, assume here that CALL_INSNs don't
|
isn't a problem. We do, however, assume here that CALL_INSNs don't
|
reference CC0. Guard against non-INSN's like CODE_LABEL. */
|
reference CC0. Guard against non-INSN's like CODE_LABEL. */
|
|
|
if ((NONJUMP_INSN_P (insn) || JUMP_P (insn))
|
if ((NONJUMP_INSN_P (insn) || JUMP_P (insn))
|
&& before_p
|
&& before_p
|
&& reg_referenced_p (cc0_rtx, PATTERN (insn)))
|
&& reg_referenced_p (cc0_rtx, PATTERN (insn)))
|
chain = chain->prev, insn = chain->insn;
|
chain = chain->prev, insn = chain->insn;
|
#endif
|
#endif
|
|
|
new = new_insn_chain ();
|
new = new_insn_chain ();
|
if (before_p)
|
if (before_p)
|
{
|
{
|
rtx link;
|
rtx link;
|
|
|
new->prev = chain->prev;
|
new->prev = chain->prev;
|
if (new->prev != 0)
|
if (new->prev != 0)
|
new->prev->next = new;
|
new->prev->next = new;
|
else
|
else
|
reload_insn_chain = new;
|
reload_insn_chain = new;
|
|
|
chain->prev = new;
|
chain->prev = new;
|
new->next = chain;
|
new->next = chain;
|
new->insn = emit_insn_before (pat, insn);
|
new->insn = emit_insn_before (pat, insn);
|
/* ??? It would be nice if we could exclude the already / still saved
|
/* ??? It would be nice if we could exclude the already / still saved
|
registers from the live sets. */
|
registers from the live sets. */
|
COPY_REG_SET (&new->live_throughout, &chain->live_throughout);
|
COPY_REG_SET (&new->live_throughout, &chain->live_throughout);
|
/* Registers that die in CHAIN->INSN still live in the new insn. */
|
/* Registers that die in CHAIN->INSN still live in the new insn. */
|
for (link = REG_NOTES (chain->insn); link; link = XEXP (link, 1))
|
for (link = REG_NOTES (chain->insn); link; link = XEXP (link, 1))
|
{
|
{
|
if (REG_NOTE_KIND (link) == REG_DEAD)
|
if (REG_NOTE_KIND (link) == REG_DEAD)
|
{
|
{
|
rtx reg = XEXP (link, 0);
|
rtx reg = XEXP (link, 0);
|
int regno, i;
|
int regno, i;
|
|
|
gcc_assert (REG_P (reg));
|
gcc_assert (REG_P (reg));
|
regno = REGNO (reg);
|
regno = REGNO (reg);
|
if (regno >= FIRST_PSEUDO_REGISTER)
|
if (regno >= FIRST_PSEUDO_REGISTER)
|
regno = reg_renumber[regno];
|
regno = reg_renumber[regno];
|
if (regno < 0)
|
if (regno < 0)
|
continue;
|
continue;
|
for (i = hard_regno_nregs[regno][GET_MODE (reg)] - 1;
|
for (i = hard_regno_nregs[regno][GET_MODE (reg)] - 1;
|
i >= 0; i--)
|
i >= 0; i--)
|
SET_REGNO_REG_SET (&new->live_throughout, regno + i);
|
SET_REGNO_REG_SET (&new->live_throughout, regno + i);
|
}
|
}
|
}
|
}
|
CLEAR_REG_SET (&new->dead_or_set);
|
CLEAR_REG_SET (&new->dead_or_set);
|
if (chain->insn == BB_HEAD (BASIC_BLOCK (chain->block)))
|
if (chain->insn == BB_HEAD (BASIC_BLOCK (chain->block)))
|
BB_HEAD (BASIC_BLOCK (chain->block)) = new->insn;
|
BB_HEAD (BASIC_BLOCK (chain->block)) = new->insn;
|
}
|
}
|
else
|
else
|
{
|
{
|
new->next = chain->next;
|
new->next = chain->next;
|
if (new->next != 0)
|
if (new->next != 0)
|
new->next->prev = new;
|
new->next->prev = new;
|
chain->next = new;
|
chain->next = new;
|
new->prev = chain;
|
new->prev = chain;
|
new->insn = emit_insn_after (pat, insn);
|
new->insn = emit_insn_after (pat, insn);
|
/* ??? It would be nice if we could exclude the already / still saved
|
/* ??? It would be nice if we could exclude the already / still saved
|
registers from the live sets, and observe REG_UNUSED notes. */
|
registers from the live sets, and observe REG_UNUSED notes. */
|
COPY_REG_SET (&new->live_throughout, &chain->live_throughout);
|
COPY_REG_SET (&new->live_throughout, &chain->live_throughout);
|
/* Registers that are set in CHAIN->INSN live in the new insn.
|
/* Registers that are set in CHAIN->INSN live in the new insn.
|
(Unless there is a REG_UNUSED note for them, but we don't
|
(Unless there is a REG_UNUSED note for them, but we don't
|
look for them here.) */
|
look for them here.) */
|
note_stores (PATTERN (chain->insn), add_stored_regs,
|
note_stores (PATTERN (chain->insn), add_stored_regs,
|
&new->live_throughout);
|
&new->live_throughout);
|
CLEAR_REG_SET (&new->dead_or_set);
|
CLEAR_REG_SET (&new->dead_or_set);
|
if (chain->insn == BB_END (BASIC_BLOCK (chain->block)))
|
if (chain->insn == BB_END (BASIC_BLOCK (chain->block)))
|
BB_END (BASIC_BLOCK (chain->block)) = new->insn;
|
BB_END (BASIC_BLOCK (chain->block)) = new->insn;
|
}
|
}
|
new->block = chain->block;
|
new->block = chain->block;
|
new->is_caller_save_insn = 1;
|
new->is_caller_save_insn = 1;
|
|
|
INSN_CODE (new->insn) = code;
|
INSN_CODE (new->insn) = code;
|
return new;
|
return new;
|
}
|
}
|
|
|
