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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [caller-save.c] - Diff between revs 154 and 816

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/* 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;
}
}
 
 

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