diff gcc/caller-save.c @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents f6334be47118
children 84e7813d76e9
line wrap: on
line diff
--- a/gcc/caller-save.c	Sun Aug 21 07:07:55 2011 +0900
+++ b/gcc/caller-save.c	Fri Oct 27 22:46:09 2017 +0900
@@ -1,7 +1,5 @@
 /* Save and restore call-clobbered registers which are live across a call.
-   Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright (C) 1989-2017 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -22,23 +20,23 @@
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
-#include "tm.h"
+#include "backend.h"
 #include "rtl.h"
-#include "regs.h"
-#include "insn-config.h"
-#include "flags.h"
-#include "hard-reg-set.h"
-#include "recog.h"
-#include "basic-block.h"
+#include "tree.h"
+#include "predict.h"
 #include "df.h"
+#include "memmodel.h"
+#include "tm_p.h"
+#include "insn-config.h"
+#include "regs.h"
+#include "emit-rtl.h"
+#include "recog.h"
 #include "reload.h"
-#include "function.h"
-#include "expr.h"
-#include "diagnostic-core.h"
-#include "tm_p.h"
+#include "alias.h"
 #include "addresses.h"
-#include "output.h"
-#include "ggc.h"
+#include "dumpfile.h"
+#include "rtl-iter.h"
+#include "target.h"
 
 #define MOVE_MAX_WORDS (MOVE_MAX / UNITS_PER_WORD)
 
@@ -74,15 +72,15 @@
 static HARD_REG_SET referenced_regs;
 
 
-typedef void refmarker_fn (rtx *loc, enum machine_mode mode, int hardregno,
+typedef void refmarker_fn (rtx *loc, machine_mode mode, int hardregno,
 			   void *mark_arg);
 
-static int reg_save_code (int, enum machine_mode);
-static int reg_restore_code (int, enum machine_mode);
+static int reg_save_code (int, machine_mode);
+static int reg_restore_code (int, machine_mode);
 
 struct saved_hard_reg;
 static void initiate_saved_hard_regs (void);
-static struct saved_hard_reg *new_saved_hard_reg (int, int);
+static void new_saved_hard_reg (int, int);
 static void finish_saved_hard_regs (void);
 static int saved_hard_reg_compare_func (const void *, const void *);
 
@@ -91,9 +89,9 @@
 static refmarker_fn mark_reg_as_referenced;
 static refmarker_fn replace_reg_with_saved_mem;
 static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *,
-			enum machine_mode *);
+			machine_mode *);
 static int insert_restore (struct insn_chain *, int, int, int,
-			   enum machine_mode *);
+			   machine_mode *);
 static struct insn_chain *insert_one_insn (struct insn_chain *, int, int,
 					   rtx);
 static void add_stored_regs (rtx, const_rtx, void *);
@@ -104,21 +102,21 @@
 static GTY(()) rtx restpat;
 static GTY(()) rtx test_reg;
 static GTY(()) rtx test_mem;
-static GTY(()) rtx saveinsn;
-static GTY(()) rtx restinsn;
+static GTY(()) rtx_insn *saveinsn;
+static GTY(()) rtx_insn *restinsn;
 
 /* Return the INSN_CODE used to save register REG in mode MODE.  */
 static int
-reg_save_code (int reg, enum machine_mode mode)
+reg_save_code (int reg, machine_mode mode)
 {
   bool ok;
   if (cached_reg_save_code[reg][mode])
      return cached_reg_save_code[reg][mode];
-  if (!HARD_REGNO_MODE_OK (reg, mode))
+  if (!targetm.hard_regno_mode_ok (reg, mode))
     {
-      /* Depending on how HARD_REGNO_MODE_OK is defined, range propagation
-	 might deduce here that reg >= FIRST_PSEUDO_REGISTER.  So the assert
-	 below silences a warning.  */
+      /* Depending on how targetm.hard_regno_mode_ok is defined, range
+	 propagation might deduce here that reg >= FIRST_PSEUDO_REGISTER.
+	 So the assert below silences a warning.  */
       gcc_assert (reg < FIRST_PSEUDO_REGISTER);
       cached_reg_save_code[reg][mode] = -1;
       cached_reg_restore_code[reg][mode] = -1;
@@ -127,8 +125,7 @@
 
   /* Update the register number and modes of the register
      and memory operand.  */
-  SET_REGNO_RAW (test_reg, reg);
-  PUT_MODE (test_reg, mode);
+  set_mode_and_regno (test_reg, mode, reg);
   PUT_MODE (test_mem, mode);
 
   /* Force re-recognition of the modified insns.  */
@@ -139,15 +136,17 @@
   cached_reg_restore_code[reg][mode] = recog_memoized (restinsn);
 
   /* Now extract both insns and see if we can meet their
-     constraints.  */
+     constraints.  We don't know here whether the save and restore will
+     be in size- or speed-tuned code, so just use the set of enabled
+     alternatives.  */
   ok = (cached_reg_save_code[reg][mode] != -1
 	&& cached_reg_restore_code[reg][mode] != -1);
   if (ok)
     {
       extract_insn (saveinsn);
-      ok = constrain_operands (1);
+      ok = constrain_operands (1, get_enabled_alternatives (saveinsn));
       extract_insn (restinsn);
-      ok &= constrain_operands (1);
+      ok &= constrain_operands (1, get_enabled_alternatives (restinsn));
     }
 
   if (! ok)
@@ -161,7 +160,7 @@
 
 /* Return the INSN_CODE used to restore register REG in mode MODE.  */
 static int
-reg_restore_code (int reg, enum machine_mode mode)
+reg_restore_code (int reg, machine_mode mode)
 {
   if (cached_reg_restore_code[reg][mode])
      return cached_reg_restore_code[reg][mode];
@@ -231,7 +230,8 @@
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     if (TEST_HARD_REG_BIT
 	(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], ADDR_SPACE_GENERIC,
+				PLUS, CONST_INT)], i))
       break;
 
   gcc_assert (i < FIRST_PSEUDO_REGISTER);
@@ -240,7 +240,7 @@
 
   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_mode (offset, Pmode));
 
       for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
 	if (regno_save_mode[i][1] != VOIDmode
@@ -261,13 +261,13 @@
      To avoid lots of unnecessary RTL allocation, we construct all the RTL
      once, then modify the memory and register operands in-place.  */
 
-  test_reg = gen_rtx_REG (VOIDmode, 0);
-  test_mem = gen_rtx_MEM (VOIDmode, address);
-  savepat = gen_rtx_SET (VOIDmode, test_mem, test_reg);
-  restpat = gen_rtx_SET (VOIDmode, test_reg, test_mem);
+  test_reg = gen_rtx_REG (word_mode, LAST_VIRTUAL_REGISTER + 1);
+  test_mem = gen_rtx_MEM (word_mode, address);
+  savepat = gen_rtx_SET (test_mem, test_reg);
+  restpat = gen_rtx_SET (test_reg, test_mem);
 
-  saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, savepat, 0, -1, 0);
-  restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, restpat, 0, -1, 0);
+  saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, savepat, 0, -1, 0);
+  restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, restpat, 0, -1, 0);
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     for (j = 1; j <= MOVE_MAX_WORDS; j++)
@@ -346,7 +346,7 @@
 
 /* Allocate and return new saved hard register with given REGNO and
    CALL_FREQ.  */
-static struct saved_hard_reg *
+static void
 new_saved_hard_reg (int regno, int call_freq)
 {
   struct saved_hard_reg *saved_reg;
@@ -359,7 +359,6 @@
   saved_reg->call_freq = call_freq;
   saved_reg->first_p = FALSE;
   saved_reg->next = -1;
-  return saved_reg;
 }
 
 /* Free memory allocated for the saved hard registers.  */
@@ -419,7 +418,7 @@
   int i, j, k, freq;
   HARD_REG_SET hard_regs_used;
   struct saved_hard_reg *saved_reg;
-  rtx insn;
+  rtx_insn *insn;
   struct insn_chain *chain, *next;
   unsigned int regno;
   HARD_REG_SET hard_regs_to_save, used_regs, this_insn_sets;
@@ -433,6 +432,8 @@
   /* Create hard reg saved regs.  */
   for (chain = reload_insn_chain; chain != 0; chain = next)
     {
+      rtx cheap;
+
       insn = chain->insn;
       next = chain->next;
       if (!CALL_P (insn)
@@ -441,7 +442,7 @@
       freq = REG_FREQ_FROM_BB (BLOCK_FOR_INSN (insn));
       REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
 			       &chain->live_throughout);
-      COPY_HARD_REG_SET (used_regs, call_used_reg_set);
+      get_call_reg_set_usage (insn, &used_regs, call_used_reg_set);
 
       /* Record all registers set in this call insn.  These don't
 	 need to be saved.  N.B. the call insn might set a subreg
@@ -463,9 +464,12 @@
 	    if (hard_reg_map[regno] != NULL)
 	      hard_reg_map[regno]->call_freq += freq;
 	    else
-	      saved_reg = new_saved_hard_reg (regno, freq);
+	      new_saved_hard_reg (regno, freq);
 	    SET_HARD_REG_BIT (hard_regs_used, regno);
 	  }
+      cheap = find_reg_note (insn, REG_RETURNED, NULL);
+      if (cheap)
+	cheap = XEXP (cheap, 0);
       /* Look through all live pseudos, mark their hard registers.  */
       EXECUTE_IF_SET_IN_REG_SET
 	(&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi)
@@ -473,17 +477,17 @@
 	  int r = reg_renumber[regno];
 	  int bound;
 
-	  if (r < 0)
+	  if (r < 0 || regno_reg_rtx[regno] == cheap)
 	    continue;
 
-	  bound = r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+	  bound = r + hard_regno_nregs (r, PSEUDO_REGNO_MODE (regno));
 	  for (; r < bound; r++)
 	    if (TEST_HARD_REG_BIT (used_regs, r))
 	      {
 		if (hard_reg_map[r] != NULL)
 		  hard_reg_map[r]->call_freq += freq;
 		else
-		  saved_reg = new_saved_hard_reg (r, freq);
+		  new_saved_hard_reg (r, freq);
 		 SET_HARD_REG_BIT (hard_regs_to_save, r);
 		 SET_HARD_REG_BIT (hard_regs_used, r);
 	      }
@@ -508,15 +512,21 @@
       memset (saved_reg_conflicts, 0, saved_regs_num * saved_regs_num);
       for (chain = reload_insn_chain; chain != 0; chain = next)
 	{
+	  rtx cheap;
 	  call_saved_regs_num = 0;
 	  insn = chain->insn;
 	  next = chain->next;
 	  if (!CALL_P (insn)
 	      || find_reg_note (insn, REG_NORETURN, NULL))
 	    continue;
+
+	  cheap = find_reg_note (insn, REG_RETURNED, NULL);
+	  if (cheap)
+	    cheap = XEXP (cheap, 0);
+
 	  REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
 				   &chain->live_throughout);
-	  COPY_HARD_REG_SET (used_regs, call_used_reg_set);
+	  get_call_reg_set_usage (insn, &used_regs, call_used_reg_set);
 
 	  /* Record all registers set in this call insn.  These don't
 	     need to be saved.  N.B. the call insn might set a subreg
@@ -546,10 +556,10 @@
 	      int r = reg_renumber[regno];
 	      int bound;
 
-	      if (r < 0)
+	      if (r < 0 || regno_reg_rtx[regno] == cheap)
 		continue;
 
-	      bound = r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+	      bound = r + hard_regno_nregs (r, PSEUDO_REGNO_MODE (regno));
 	      for (; r < bound; r++)
 		if (TEST_HARD_REG_BIT (used_regs, r))
 		  call_saved_regs[call_saved_regs_num++] = hard_reg_map[r];
@@ -735,7 +745,7 @@
 save_call_clobbered_regs (void)
 {
   struct insn_chain *chain, *next, *last = NULL;
-  enum machine_mode save_mode [FIRST_PSEUDO_REGISTER];
+  machine_mode save_mode [FIRST_PSEUDO_REGISTER];
 
   /* Computed in mark_set_regs, holds all registers set by the current
      instruction.  */
@@ -746,7 +756,7 @@
 
   for (chain = reload_insn_chain; chain != 0; chain = next)
     {
-      rtx insn = chain->insn;
+      rtx_insn *insn = chain->insn;
       enum rtx_code code = GET_CODE (insn);
 
       next = chain->next;
@@ -795,7 +805,13 @@
 	    {
 	      unsigned regno;
 	      HARD_REG_SET hard_regs_to_save;
+	      HARD_REG_SET call_def_reg_set;
 	      reg_set_iterator rsi;
+	      rtx cheap;
+
+	      cheap = find_reg_note (insn, REG_RETURNED, NULL);
+	      if (cheap)
+		cheap = XEXP (cheap, 0);
 
 	      /* Use the register life information in CHAIN to compute which
 		 regs are live during the call.  */
@@ -815,15 +831,14 @@
 		{
 		  int r = reg_renumber[regno];
 		  int nregs;
-		  enum machine_mode mode;
+		  machine_mode mode;
 
-		  if (r < 0)
+		  if (r < 0 || regno_reg_rtx[regno] == cheap)
 		    continue;
-		  nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+		  nregs = hard_regno_nregs (r, PSEUDO_REGNO_MODE (regno));
 		  mode = HARD_REGNO_CALLER_SAVE_MODE
 		    (r, nregs, PSEUDO_REGNO_MODE (regno));
-		  if (GET_MODE_BITSIZE (mode)
-		      > GET_MODE_BITSIZE (save_mode[r]))
+		  if (partial_subreg_p (save_mode[r], mode))
 		    save_mode[r] = mode;
 		  while (nregs-- > 0)
 		    SET_HARD_REG_BIT (hard_regs_to_save, r + nregs);
@@ -840,7 +855,9 @@
 	      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, hard_regs_saved);
-	      AND_HARD_REG_SET (hard_regs_to_save, call_used_reg_set);
+	      get_call_reg_set_usage (insn, &call_def_reg_set,
+				      call_used_reg_set);
+	      AND_HARD_REG_SET (hard_regs_to_save, call_def_reg_set);
 
 	      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
 		if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
@@ -851,6 +868,24 @@
 	      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
 		if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
 		  n_regs_saved++;
+	      
+	      if (cheap
+		  && HARD_REGISTER_P (cheap)
+		  && TEST_HARD_REG_BIT (call_used_reg_set, REGNO (cheap)))
+		{
+		  rtx dest, newpat;
+		  rtx pat = PATTERN (insn);
+		  if (GET_CODE (pat) == PARALLEL)
+		    pat = XVECEXP (pat, 0, 0);
+		  dest = SET_DEST (pat);
+		  /* For multiple return values dest is PARALLEL.
+		     Currently we handle only single return value case.  */
+		  if (REG_P (dest))
+		    {
+		      newpat = gen_rtx_SET (cheap, copy_rtx (dest));
+		      chain = insert_one_insn (chain, 0, -1, newpat);
+		    }
+		}
 	    }
           last = chain;
 	}
@@ -871,7 +906,7 @@
 	      && last
 	      && last->block == chain->block)
 	    {
-	      rtx ins, prev;
+	      rtx_insn *ins, *prev;
 	      basic_block bb = BLOCK_FOR_INSN (insn);
 
 	      /* When adding hard reg restores after a DEBUG_INSN, move
@@ -883,13 +918,13 @@
 		  prev = PREV_INSN (ins);
 		  if (NOTE_P (ins))
 		    {
-		      NEXT_INSN (prev) = NEXT_INSN (ins);
-		      PREV_INSN (NEXT_INSN (ins)) = prev;
-		      PREV_INSN (ins) = insn;
-		      NEXT_INSN (ins) = NEXT_INSN (insn);
-		      NEXT_INSN (insn) = ins;
+		      SET_NEXT_INSN (prev) = NEXT_INSN (ins);
+		      SET_PREV_INSN (NEXT_INSN (ins)) = prev;
+		      SET_PREV_INSN (ins) = insn;
+		      SET_NEXT_INSN (ins) = NEXT_INSN (insn);
+		      SET_NEXT_INSN (insn) = ins;
 		      if (NEXT_INSN (ins))
-			PREV_INSN (NEXT_INSN (ins)) = ins;
+			SET_PREV_INSN (NEXT_INSN (ins)) = ins;
                       if (BB_END (bb) == insn)
 			BB_END (bb) = ins;
 		    }
@@ -931,7 +966,7 @@
 	   && REGNO (reg) < FIRST_PSEUDO_REGISTER)
     {
       regno = REGNO (reg);
-      endregno = END_HARD_REGNO (reg);
+      endregno = END_REGNO (reg);
     }
   else
     return;
@@ -948,7 +983,7 @@
 add_stored_regs (rtx reg, const_rtx setter, void *data)
 {
   int regno, endregno, i;
-  enum machine_mode mode = GET_MODE (reg);
+  machine_mode mode = GET_MODE (reg);
   int offset = 0;
 
   if (GET_CODE (setter) == CLOBBER)
@@ -999,10 +1034,7 @@
 	      /* If we're setting only part of a multi-word register,
 		 we shall mark it as referenced, because the words
 		 that are not being set should be restored.  */
-	      && ((GET_MODE_SIZE (GET_MODE (*loc))
-		   >= GET_MODE_SIZE (GET_MODE (SUBREG_REG (*loc))))
-		  || (GET_MODE_SIZE (GET_MODE (SUBREG_REG (*loc)))
-		      <= UNITS_PER_WORD))))
+	      && !read_modify_subreg_p (*loc)))
 	return;
     }
   if (code == MEM || code == SUBREG)
@@ -1027,10 +1059,10 @@
       /* If this is a pseudo that did not get a hard register, scan its
 	 memory location, since it might involve the use of another
 	 register, which might be saved.  */
-      else if (reg_equiv_mem[regno] != 0)
-	mark_referenced_regs (&XEXP (reg_equiv_mem[regno], 0), mark, arg);
-      else if (reg_equiv_address[regno] != 0)
-	mark_referenced_regs (&reg_equiv_address[regno], mark, arg);
+      else if (reg_equiv_mem (regno) != 0)
+	mark_referenced_regs (&XEXP (reg_equiv_mem (regno), 0), mark, arg);
+      else if (reg_equiv_address (regno) != 0)
+	mark_referenced_regs (&reg_equiv_address (regno), mark, arg);
       return;
     }
 
@@ -1051,7 +1083,7 @@
 
 static void
 mark_reg_as_referenced (rtx *loc ATTRIBUTE_UNUSED,
-			enum machine_mode mode,
+			machine_mode mode,
 			int hardregno,
 			void *arg ATTRIBUTE_UNUSED)
 {
@@ -1064,13 +1096,13 @@
 
 static void
 replace_reg_with_saved_mem (rtx *loc,
-			    enum machine_mode mode,
+			    machine_mode mode,
 			    int regno,
 			    void *arg)
 {
-  unsigned int i, nregs = hard_regno_nregs [regno][mode];
+  unsigned int i, nregs = hard_regno_nregs (regno, mode);
   rtx mem;
-  enum machine_mode *save_mode = (enum machine_mode *)arg;
+  machine_mode *save_mode = (machine_mode *)arg;
 
   for (i = 0; i < nregs; i++)
     if (TEST_HARD_REG_BIT (hard_regs_saved, regno + i))
@@ -1090,24 +1122,14 @@
     {
       mem = copy_rtx (regno_save_mem[regno][nregs]);
 
-      if (nregs == (unsigned int) hard_regno_nregs[regno][save_mode[regno]])
+      if (nregs == hard_regno_nregs (regno, save_mode[regno]))
 	mem = adjust_address_nv (mem, save_mode[regno], 0);
 
       if (GET_MODE (mem) != mode)
 	{
 	  /* This is gen_lowpart_if_possible(), but without validating
 	     the newly-formed address.  */
-	  int offset = 0;
-
-	  if (WORDS_BIG_ENDIAN)
-	    offset = (MAX (GET_MODE_SIZE (GET_MODE (mem)), UNITS_PER_WORD)
-		      - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
-	  if (BYTES_BIG_ENDIAN)
-	    /* Adjust the address so that the address-after-the-data is
-	       unchanged.  */
-	    offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
-		       - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (mem))));
-
+	  HOST_WIDE_INT offset = byte_lowpart_offset (mode, GET_MODE (mem));
 	  mem = adjust_address_nv (mem, mode, offset);
 	}
     }
@@ -1122,9 +1144,12 @@
 	  }
 	else
 	  {
-	    gcc_assert (save_mode[regno] != VOIDmode);
-	    XVECEXP (mem, 0, i) = gen_rtx_REG (save_mode [regno],
-					       regno + i);
+	    machine_mode smode = save_mode[regno];
+	    gcc_assert (smode != VOIDmode);
+	    if (hard_regno_nregs (regno, smode) > 1)
+	      smode = mode_for_size (GET_MODE_SIZE (mode) / nregs,
+				     GET_MODE_CLASS (mode), 0).require ();
+	    XVECEXP (mem, 0, i) = gen_rtx_REG (smode, regno + i);
 	  }
     }
 
@@ -1148,7 +1173,7 @@
 
 static int
 insert_restore (struct insn_chain *chain, int before_p, int regno,
-		int maxrestore, enum machine_mode *save_mode)
+		int maxrestore, machine_mode *save_mode)
 {
   int i, k;
   rtx pat = NULL_RTX;
@@ -1194,7 +1219,7 @@
   mem = regno_save_mem [regno][numregs];
   if (save_mode [regno] != VOIDmode
       && save_mode [regno] != GET_MODE (mem)
-      && numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]]
+      && numregs == hard_regno_nregs (regno, save_mode [regno])
       /* Check that insn to restore REGNO in save_mode[regno] is
 	 correct.  */
       && reg_save_code (regno, save_mode[regno]) >= 0)
@@ -1207,9 +1232,7 @@
   gcc_assert (MIN (MAX_SUPPORTED_STACK_ALIGNMENT,
 		   GET_MODE_ALIGNMENT (GET_MODE (mem))) <= MEM_ALIGN (mem));
 
-  pat = gen_rtx_SET (VOIDmode,
-		     gen_rtx_REG (GET_MODE (mem),
-				  regno), mem);
+  pat = gen_rtx_SET (gen_rtx_REG (GET_MODE (mem), regno), mem);
   code = reg_restore_code (regno, GET_MODE (mem));
   new_chain = insert_one_insn (chain, before_p, code, pat);
 
@@ -1229,7 +1252,7 @@
 
 static int
 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, machine_mode *save_mode)
 {
   int i;
   unsigned int k;
@@ -1275,7 +1298,7 @@
   mem = regno_save_mem [regno][numregs];
   if (save_mode [regno] != VOIDmode
       && save_mode [regno] != GET_MODE (mem)
-      && numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]]
+      && numregs == hard_regno_nregs (regno, save_mode [regno])
       /* Check that insn to save REGNO in save_mode[regno] is
 	 correct.  */
       && reg_save_code (regno, save_mode[regno]) >= 0)
@@ -1288,9 +1311,7 @@
   gcc_assert (MIN (MAX_SUPPORTED_STACK_ALIGNMENT,
 		   GET_MODE_ALIGNMENT (GET_MODE (mem))) <= MEM_ALIGN (mem));
 
-  pat = gen_rtx_SET (VOIDmode, mem,
-		     gen_rtx_REG (GET_MODE (mem),
-				  regno));
+  pat = gen_rtx_SET (mem, gen_rtx_REG (GET_MODE (mem), regno));
   code = reg_save_code (regno, GET_MODE (mem));
   new_chain = insert_one_insn (chain, before_p, code, pat);
 
@@ -1306,58 +1327,44 @@
   return numregs - 1;
 }
 
-/* A for_each_rtx callback used by add_used_regs.  Add the hard-register
-   equivalent of each REG to regset DATA.  */
-
-static int
-add_used_regs_1 (rtx *loc, void *data)
-{
-  int regno, i;
-  regset live;
-  rtx x;
-
-  x = *loc;
-  live = (regset) data;
-  if (REG_P (x))
-    {
-      regno = REGNO (x);
-      if (!HARD_REGISTER_NUM_P (regno))
-	regno = reg_renumber[regno];
-      if (regno >= 0)
-	for (i = hard_regno_nregs[regno][GET_MODE (x)] - 1; i >= 0; i--)
-	  SET_REGNO_REG_SET (live, regno + i);
-    }
-  return 0;
-}
-
 /* A note_uses callback used by insert_one_insn.  Add the hard-register
    equivalent of each REG to regset DATA.  */
 
 static void
 add_used_regs (rtx *loc, void *data)
 {
-  for_each_rtx (loc, add_used_regs_1, data);
+  subrtx_iterator::array_type array;
+  FOR_EACH_SUBRTX (iter, array, *loc, NONCONST)
+    {
+      const_rtx x = *iter;
+      if (REG_P (x))
+	{
+	  unsigned int regno = REGNO (x);
+	  if (HARD_REGISTER_NUM_P (regno))
+	    bitmap_set_range ((regset) data, regno, REG_NREGS (x));
+	  else
+	    gcc_checking_assert (reg_renumber[regno] < 0);
+	}
+    }
 }
 
 /* Emit a new caller-save insn and set the code.  */
 static struct insn_chain *
 insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx pat)
 {
-  rtx insn = chain->insn;
+  rtx_insn *insn = chain->insn;
   struct insn_chain *new_chain;
 
-#ifdef HAVE_cc0
   /* 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
      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
      reference CC0.  Guard against non-INSN's like CODE_LABEL.  */
 
-  if ((NONJUMP_INSN_P (insn) || JUMP_P (insn))
+  if (HAVE_cc0 && (NONJUMP_INSN_P (insn) || JUMP_P (insn))
       && before_p
       && reg_referenced_p (cc0_rtx, PATTERN (insn)))
     chain = chain->prev, insn = chain->insn;
-#endif
 
   new_chain = new_insn_chain ();
   if (before_p)
@@ -1388,8 +1395,8 @@
 		     &new_chain->live_throughout);
 
       CLEAR_REG_SET (&new_chain->dead_or_set);
-      if (chain->insn == BB_HEAD (BASIC_BLOCK (chain->block)))
-	BB_HEAD (BASIC_BLOCK (chain->block)) = new_chain->insn;
+      if (chain->insn == BB_HEAD (BASIC_BLOCK_FOR_FN (cfun, chain->block)))
+	BB_HEAD (BASIC_BLOCK_FOR_FN (cfun, chain->block)) = new_chain->insn;
     }
   else
     {
@@ -1408,8 +1415,8 @@
       note_stores (PATTERN (chain->insn), add_stored_regs,
 		   &new_chain->live_throughout);
       CLEAR_REG_SET (&new_chain->dead_or_set);
-      if (chain->insn == BB_END (BASIC_BLOCK (chain->block)))
-	BB_END (BASIC_BLOCK (chain->block)) = new_chain->insn;
+      if (chain->insn == BB_END (BASIC_BLOCK_FOR_FN (cfun, chain->block)))
+	BB_END (BASIC_BLOCK_FOR_FN (cfun, chain->block)) = new_chain->insn;
     }
   new_chain->block = chain->block;
   new_chain->is_caller_save_insn = 1;