--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/lra-spills.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,797 @@
+/* Change pseudos by memory.
+   Copyright (C) 2010-2017 Free Software Foundation, Inc.
+   Contributed by Vladimir Makarov <vmakarov@redhat.com>.
+
+This file is part of GCC.
+
+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
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.	If not see
+<http://www.gnu.org/licenses/>.	 */
+
+
+/* This file contains code for a pass to change spilled pseudos into
+   memory.
+
+   The pass creates necessary stack slots and assigns spilled pseudos
+   to the stack slots in following way:
+
+   for all spilled pseudos P most frequently used first do
+     for all stack slots S do
+       if P doesn't conflict with pseudos assigned to S then
+	 assign S to P and goto to the next pseudo process
+       end
+     end
+     create new stack slot S and assign P to S
+   end
+
+   The actual algorithm is bit more complicated because of different
+   pseudo sizes.
+
+   After that the code changes spilled pseudos (except ones created
+   from scratches) by corresponding stack slot memory in RTL.
+
+   If at least one stack slot was created, we need to run more passes
+   because we have new addresses which should be checked and because
+   the old address displacements might change and address constraints
+   (or insn memory constraints) might not be satisfied any more.
+
+   For some targets, the pass can spill some pseudos into hard
+   registers of different class (usually into vector registers)
+   instead of spilling them into memory if it is possible and
+   profitable.  Spilling GENERAL_REGS pseudo into SSE registers for
+   Intel Corei7 is an example of such optimization.  And this is
+   actually recommended by Intel optimization guide.
+
+   The file also contains code for final change of pseudos on hard
+   regs correspondingly assigned to them.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "backend.h"
+#include "target.h"
+#include "rtl.h"
+#include "df.h"
+#include "insn-config.h"
+#include "regs.h"
+#include "memmodel.h"
+#include "ira.h"
+#include "recog.h"
+#include "output.h"
+#include "cfgrtl.h"
+#include "lra.h"
+#include "lra-int.h"
+
+
+/* Max regno at the start of the pass.	*/
+static int regs_num;
+
+/* Map spilled regno -> hard regno used instead of memory for
+   spilling.  */
+static rtx *spill_hard_reg;
+
+/* The structure describes stack slot of a spilled pseudo.  */
+struct pseudo_slot
+{
+  /* Number (0, 1, ...) of the stack slot to which given pseudo
+     belongs.  */
+  int slot_num;
+  /* First or next slot with the same slot number.  */
+  struct pseudo_slot *next, *first;
+  /* Memory representing the spilled pseudo.  */
+  rtx mem;
+};
+
+/* The stack slots for each spilled pseudo.  Indexed by regnos.	 */
+static struct pseudo_slot *pseudo_slots;
+
+/* The structure describes a register or a stack slot which can be
+   used for several spilled pseudos.  */
+struct slot
+{
+  /* First pseudo with given stack slot.  */
+  int regno;
+  /* Hard reg into which the slot pseudos are spilled.	The value is
+     negative for pseudos spilled into memory.	*/
+  int hard_regno;
+  /* Maximum alignment required by all users of the slot.  */
+  unsigned int align;
+  /* Maximum size required by all users of the slot.  */
+  HOST_WIDE_INT size;
+  /* Memory representing the all stack slot.  It can be different from
+     memory representing a pseudo belonging to give stack slot because
+     pseudo can be placed in a part of the corresponding stack slot.
+     The value is NULL for pseudos spilled into a hard reg.  */
+  rtx mem;
+  /* Combined live ranges of all pseudos belonging to given slot.  It
+     is used to figure out that a new spilled pseudo can use given
+     stack slot.  */
+  lra_live_range_t live_ranges;
+};
+
+/* Array containing info about the stack slots.	 The array element is
+   indexed by the stack slot number in the range [0..slots_num).  */
+static struct slot *slots;
+/* The number of the stack slots currently existing.  */
+static int slots_num;
+
+/* Set up memory of the spilled pseudo I.  The function can allocate
+   the corresponding stack slot if it is not done yet.	*/
+static void
+assign_mem_slot (int i)
+{
+  rtx x = NULL_RTX;
+  machine_mode mode = GET_MODE (regno_reg_rtx[i]);
+  HOST_WIDE_INT inherent_size = PSEUDO_REGNO_BYTES (i);
+  machine_mode wider_mode
+    = wider_subreg_mode (mode, lra_reg_info[i].biggest_mode);
+  HOST_WIDE_INT total_size = GET_MODE_SIZE (wider_mode);
+  HOST_WIDE_INT adjust = 0;
+
+  lra_assert (regno_reg_rtx[i] != NULL_RTX && REG_P (regno_reg_rtx[i])
+	      && lra_reg_info[i].nrefs != 0 && reg_renumber[i] < 0);
+
+  unsigned int slot_num = pseudo_slots[i].slot_num;
+  x = slots[slot_num].mem;
+  if (!x)
+    {
+      x = assign_stack_local (BLKmode, slots[slot_num].size,
+			      slots[slot_num].align);
+      slots[slot_num].mem = x;
+    }
+
+  /* On a big endian machine, the "address" of the slot is the address
+     of the low part that fits its inherent mode.  */
+  adjust += subreg_size_lowpart_offset (inherent_size, total_size);
+  x = adjust_address_nv (x, GET_MODE (regno_reg_rtx[i]), adjust);
+
+  /* Set all of the memory attributes as appropriate for a spill.  */
+  set_mem_attrs_for_spill (x);
+  pseudo_slots[i].mem = x;
+}
+
+/* Sort pseudos according their usage frequencies.  */
+static int
+regno_freq_compare (const void *v1p, const void *v2p)
+{
+  const int regno1 = *(const int *) v1p;
+  const int regno2 = *(const int *) v2p;
+  int diff;
+
+  if ((diff = lra_reg_info[regno2].freq - lra_reg_info[regno1].freq) != 0)
+    return diff;
+  return regno1 - regno2;
+}
+
+/* Sort pseudos according to their slots, putting the slots in the order
+   that they should be allocated.  Slots with lower numbers have the highest
+   priority and should get the smallest displacement from the stack or
+   frame pointer (whichever is being used).
+
+   The first allocated slot is always closest to the frame pointer,
+   so prefer lower slot numbers when frame_pointer_needed.  If the stack
+   and frame grow in the same direction, then the first allocated slot is
+   always closest to the initial stack pointer and furthest away from the
+   final stack pointer, so allocate higher numbers first when using the
+   stack pointer in that case.  The reverse is true if the stack and
+   frame grow in opposite directions.  */
+static int
+pseudo_reg_slot_compare (const void *v1p, const void *v2p)
+{
+  const int regno1 = *(const int *) v1p;
+  const int regno2 = *(const int *) v2p;
+  int diff, slot_num1, slot_num2;
+  int total_size1, total_size2;
+
+  slot_num1 = pseudo_slots[regno1].slot_num;
+  slot_num2 = pseudo_slots[regno2].slot_num;
+  if ((diff = slot_num1 - slot_num2) != 0)
+    return (frame_pointer_needed
+	    || (!FRAME_GROWS_DOWNWARD) == STACK_GROWS_DOWNWARD ? diff : -diff);
+  total_size1 = GET_MODE_SIZE (lra_reg_info[regno1].biggest_mode);
+  total_size2 = GET_MODE_SIZE (lra_reg_info[regno2].biggest_mode);
+  if ((diff = total_size2 - total_size1) != 0)
+    return diff;
+  return regno1 - regno2;
+}
+
+/* Assign spill hard registers to N pseudos in PSEUDO_REGNOS which is
+   sorted in order of highest frequency first.  Put the pseudos which
+   did not get a spill hard register at the beginning of array
+   PSEUDO_REGNOS.  Return the number of such pseudos.  */
+static int
+assign_spill_hard_regs (int *pseudo_regnos, int n)
+{
+  int i, k, p, regno, res, spill_class_size, hard_regno, nr;
+  enum reg_class rclass, spill_class;
+  machine_mode mode;
+  lra_live_range_t r;
+  rtx_insn *insn;
+  rtx set;
+  basic_block bb;
+  HARD_REG_SET conflict_hard_regs;
+  bitmap setjump_crosses = regstat_get_setjmp_crosses ();
+  /* Hard registers which can not be used for any purpose at given
+     program point because they are unallocatable or already allocated
+     for other pseudos.	 */
+  HARD_REG_SET *reserved_hard_regs;
+
+  if (! lra_reg_spill_p)
+    return n;
+  /* Set up reserved hard regs for every program point.	 */
+  reserved_hard_regs = XNEWVEC (HARD_REG_SET, lra_live_max_point);
+  for (p = 0; p < lra_live_max_point; p++)
+    COPY_HARD_REG_SET (reserved_hard_regs[p], lra_no_alloc_regs);
+  for (i = FIRST_PSEUDO_REGISTER; i < regs_num; i++)
+    if (lra_reg_info[i].nrefs != 0
+	&& (hard_regno = lra_get_regno_hard_regno (i)) >= 0)
+      for (r = lra_reg_info[i].live_ranges; r != NULL; r = r->next)
+	for (p = r->start; p <= r->finish; p++)
+	  add_to_hard_reg_set (&reserved_hard_regs[p],
+			       lra_reg_info[i].biggest_mode, hard_regno);
+  auto_bitmap ok_insn_bitmap (&reg_obstack);
+  FOR_EACH_BB_FN (bb, cfun)
+    FOR_BB_INSNS (bb, insn)
+      if (DEBUG_INSN_P (insn)
+	  || ((set = single_set (insn)) != NULL_RTX
+	      && REG_P (SET_SRC (set)) && REG_P (SET_DEST (set))))
+	bitmap_set_bit (ok_insn_bitmap, INSN_UID (insn));
+  for (res = i = 0; i < n; i++)
+    {
+      regno = pseudo_regnos[i];
+      rclass = lra_get_allocno_class (regno);
+      if (bitmap_bit_p (setjump_crosses, regno)
+	  || (spill_class
+	      = ((enum reg_class)
+		 targetm.spill_class ((reg_class_t) rclass,
+				      PSEUDO_REGNO_MODE (regno)))) == NO_REGS
+	  || bitmap_intersect_compl_p (&lra_reg_info[regno].insn_bitmap,
+				       ok_insn_bitmap))
+	{
+	  pseudo_regnos[res++] = regno;
+	  continue;
+	}
+      lra_assert (spill_class != NO_REGS);
+      COPY_HARD_REG_SET (conflict_hard_regs,
+			 lra_reg_info[regno].conflict_hard_regs);
+      for (r = lra_reg_info[regno].live_ranges; r != NULL; r = r->next)
+	for (p = r->start; p <= r->finish; p++)
+	  IOR_HARD_REG_SET (conflict_hard_regs, reserved_hard_regs[p]);
+      spill_class_size = ira_class_hard_regs_num[spill_class];
+      mode = lra_reg_info[regno].biggest_mode;
+      for (k = 0; k < spill_class_size; k++)
+	{
+	  hard_regno = ira_class_hard_regs[spill_class][k];
+	  if (! overlaps_hard_reg_set_p (conflict_hard_regs, mode, hard_regno))
+	    break;
+	}
+      if (k >= spill_class_size)
+	{
+	   /* There is no available regs -- assign memory later.  */
+	  pseudo_regnos[res++] = regno;
+	  continue;
+	}
+      if (lra_dump_file != NULL)
+	fprintf (lra_dump_file, "  Spill r%d into hr%d\n", regno, hard_regno);
+      /* Update reserved_hard_regs.  */
+      for (r = lra_reg_info[regno].live_ranges; r != NULL; r = r->next)
+	for (p = r->start; p <= r->finish; p++)
+	  add_to_hard_reg_set (&reserved_hard_regs[p],
+			       lra_reg_info[regno].biggest_mode, hard_regno);
+      spill_hard_reg[regno]
+	= gen_raw_REG (PSEUDO_REGNO_MODE (regno), hard_regno);
+      for (nr = 0;
+	   nr < hard_regno_nregs (hard_regno,
+				  lra_reg_info[regno].biggest_mode);
+	   nr++)
+	/* Just loop.  */
+	df_set_regs_ever_live (hard_regno + nr, true);
+    }
+  free (reserved_hard_regs);
+  return res;
+}
+
+/* Add pseudo REGNO to slot SLOT_NUM.  */
+static void
+add_pseudo_to_slot (int regno, int slot_num)
+{
+  struct pseudo_slot *first;
+
+  /* Each pseudo has an inherent size which comes from its own mode,
+     and a total size which provides room for paradoxical subregs.
+     We need to make sure the size and alignment of the slot are
+     sufficient for both.  */
+  machine_mode mode = wider_subreg_mode (PSEUDO_REGNO_MODE (regno),
+					 lra_reg_info[regno].biggest_mode);
+  unsigned int align = spill_slot_alignment (mode);
+  slots[slot_num].align = MAX (slots[slot_num].align, align);
+  slots[slot_num].size = MAX (slots[slot_num].size, GET_MODE_SIZE (mode));
+
+  if (slots[slot_num].regno < 0)
+    {
+      /* It is the first pseudo in the slot.  */
+      slots[slot_num].regno = regno;
+      pseudo_slots[regno].first = &pseudo_slots[regno];
+      pseudo_slots[regno].next = NULL;
+    }
+  else
+    {
+      first = pseudo_slots[regno].first = &pseudo_slots[slots[slot_num].regno];
+      pseudo_slots[regno].next = first->next;
+      first->next = &pseudo_slots[regno];
+    }
+  pseudo_slots[regno].mem = NULL_RTX;
+  pseudo_slots[regno].slot_num = slot_num;
+  slots[slot_num].live_ranges
+    = lra_merge_live_ranges (slots[slot_num].live_ranges,
+			     lra_copy_live_range_list
+			     (lra_reg_info[regno].live_ranges));
+}
+
+/* Assign stack slot numbers to pseudos in array PSEUDO_REGNOS of
+   length N.  Sort pseudos in PSEUDO_REGNOS for subsequent assigning
+   memory stack slots.	*/
+static void
+assign_stack_slot_num_and_sort_pseudos (int *pseudo_regnos, int n)
+{
+  int i, j, regno;
+
+  slots_num = 0;
+  /* Assign stack slot numbers to spilled pseudos, use smaller numbers
+     for most frequently used pseudos.	*/
+  for (i = 0; i < n; i++)
+    {
+      regno = pseudo_regnos[i];
+      if (! flag_ira_share_spill_slots)
+	j = slots_num;
+      else
+	{
+	  for (j = 0; j < slots_num; j++)
+	    if (slots[j].hard_regno < 0
+		&& ! (lra_intersected_live_ranges_p
+		      (slots[j].live_ranges,
+		       lra_reg_info[regno].live_ranges)))
+	      break;
+	}
+      if (j >= slots_num)
+	{
+	  /* New slot.	*/
+	  slots[j].live_ranges = NULL;
+	  slots[j].size = 0;
+	  slots[j].align = BITS_PER_UNIT;
+	  slots[j].regno = slots[j].hard_regno = -1;
+	  slots[j].mem = NULL_RTX;
+	  slots_num++;
+	}
+      add_pseudo_to_slot (regno, j);
+    }
+  /* Sort regnos according to their slot numbers.  */
+  qsort (pseudo_regnos, n, sizeof (int), pseudo_reg_slot_compare);
+}
+
+/* Recursively process LOC in INSN and change spilled pseudos to the
+   corresponding memory or spilled hard reg.  Ignore spilled pseudos
+   created from the scratches.  Return true if the pseudo nrefs equal
+   to 0 (don't change the pseudo in this case).  Otherwise return false.  */
+static bool
+remove_pseudos (rtx *loc, rtx_insn *insn)
+{
+  int i;
+  rtx hard_reg;
+  const char *fmt;
+  enum rtx_code code;
+  bool res = false;
+  
+  if (*loc == NULL_RTX)
+    return res;
+  code = GET_CODE (*loc);
+  if (code == REG && (i = REGNO (*loc)) >= FIRST_PSEUDO_REGISTER
+      && lra_get_regno_hard_regno (i) < 0
+      /* We do not want to assign memory for former scratches because
+	 it might result in an address reload for some targets.	 In
+	 any case we transform such pseudos not getting hard registers
+	 into scratches back.  */
+      && ! lra_former_scratch_p (i))
+    {
+      if (lra_reg_info[i].nrefs == 0
+	  && pseudo_slots[i].mem == NULL && spill_hard_reg[i] == NULL)
+	return true;
+      if ((hard_reg = spill_hard_reg[i]) != NULL_RTX)
+	*loc = copy_rtx (hard_reg);
+      else
+	{
+	  rtx x = lra_eliminate_regs_1 (insn, pseudo_slots[i].mem,
+					GET_MODE (pseudo_slots[i].mem),
+					false, false, 0, true);
+	  *loc = x != pseudo_slots[i].mem ? x : copy_rtx (x);
+	}
+      return res;
+    }
+
+  fmt = GET_RTX_FORMAT (code);
+  for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+    {
+      if (fmt[i] == 'e')
+	res = remove_pseudos (&XEXP (*loc, i), insn) || res;
+      else if (fmt[i] == 'E')
+	{
+	  int j;
+
+	  for (j = XVECLEN (*loc, i) - 1; j >= 0; j--)
+	    res = remove_pseudos (&XVECEXP (*loc, i, j), insn) || res;
+	}
+    }
+  return res;
+}
+
+/* Convert spilled pseudos into their stack slots or spill hard regs,
+   put insns to process on the constraint stack (that is all insns in
+   which pseudos were changed to memory or spill hard regs).   */
+static void
+spill_pseudos (void)
+{
+  basic_block bb;
+  rtx_insn *insn, *curr;
+  int i;
+
+  auto_bitmap spilled_pseudos (&reg_obstack);
+  auto_bitmap changed_insns (&reg_obstack);
+  for (i = FIRST_PSEUDO_REGISTER; i < regs_num; i++)
+    {
+      if (lra_reg_info[i].nrefs != 0 && lra_get_regno_hard_regno (i) < 0
+	  && ! lra_former_scratch_p (i))
+	{
+	  bitmap_set_bit (spilled_pseudos, i);
+	  bitmap_ior_into (changed_insns, &lra_reg_info[i].insn_bitmap);
+	}
+    }
+  FOR_EACH_BB_FN (bb, cfun)
+    {
+      FOR_BB_INSNS_SAFE (bb, insn, curr)
+	{
+	  bool removed_pseudo_p = false;
+	  
+	  if (bitmap_bit_p (changed_insns, INSN_UID (insn)))
+	    {
+	      rtx *link_loc, link;
+
+	      removed_pseudo_p = remove_pseudos (&PATTERN (insn), insn);
+	      if (CALL_P (insn)
+		  && remove_pseudos (&CALL_INSN_FUNCTION_USAGE (insn), insn))
+		removed_pseudo_p = true;
+	      for (link_loc = &REG_NOTES (insn);
+		   (link = *link_loc) != NULL_RTX;
+		   link_loc = &XEXP (link, 1))
+		{
+		  switch (REG_NOTE_KIND (link))
+		    {
+		    case REG_FRAME_RELATED_EXPR:
+		    case REG_CFA_DEF_CFA:
+		    case REG_CFA_ADJUST_CFA:
+		    case REG_CFA_OFFSET:
+		    case REG_CFA_REGISTER:
+		    case REG_CFA_EXPRESSION:
+		    case REG_CFA_RESTORE:
+		    case REG_CFA_SET_VDRAP:
+		      if (remove_pseudos (&XEXP (link, 0), insn))
+			removed_pseudo_p = true;
+		      break;
+		    default:
+		      break;
+		    }
+		}
+	      if (lra_dump_file != NULL)
+		fprintf (lra_dump_file,
+			 "Changing spilled pseudos to memory in insn #%u\n",
+			 INSN_UID (insn));
+	      lra_push_insn (insn);
+	      if (lra_reg_spill_p || targetm.different_addr_displacement_p ())
+		lra_set_used_insn_alternative (insn, -1);
+	    }
+	  else if (CALL_P (insn)
+		   /* Presence of any pseudo in CALL_INSN_FUNCTION_USAGE
+		      does not affect value of insn_bitmap of the
+		      corresponding lra_reg_info.  That is because we
+		      don't need to reload pseudos in
+		      CALL_INSN_FUNCTION_USAGEs.  So if we process only
+		      insns in the insn_bitmap of given pseudo here, we
+		      can miss the pseudo in some
+		      CALL_INSN_FUNCTION_USAGEs.  */
+		   && remove_pseudos (&CALL_INSN_FUNCTION_USAGE (insn), insn))
+	    removed_pseudo_p = true;
+	  if (removed_pseudo_p)
+	    {
+	      lra_assert (DEBUG_INSN_P (insn));
+	      lra_invalidate_insn_data (insn);
+	      INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC ();
+	      if (lra_dump_file != NULL)
+		fprintf (lra_dump_file,
+			 "Debug insn #%u is reset because it referenced "
+			 "removed pseudo\n", INSN_UID (insn));
+	    }
+	  bitmap_and_compl_into (df_get_live_in (bb), spilled_pseudos);
+	  bitmap_and_compl_into (df_get_live_out (bb), spilled_pseudos);
+	}
+    }
+}
+
+/* Return true if we need to change some pseudos into memory.  */
+bool
+lra_need_for_spills_p (void)
+{
+  int i; max_regno = max_reg_num ();
+
+  for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
+    if (lra_reg_info[i].nrefs != 0 && lra_get_regno_hard_regno (i) < 0
+	&& ! lra_former_scratch_p (i))
+      return true;
+  return false;
+}
+
+/* Change spilled pseudos into memory or spill hard regs.  Put changed
+   insns on the constraint stack (these insns will be considered on
+   the next constraint pass).  The changed insns are all insns in
+   which pseudos were changed.  */
+void
+lra_spill (void)
+{
+  int i, n, curr_regno;
+  int *pseudo_regnos;
+
+  regs_num = max_reg_num ();
+  spill_hard_reg = XNEWVEC (rtx, regs_num);
+  pseudo_regnos = XNEWVEC (int, regs_num);
+  for (n = 0, i = FIRST_PSEUDO_REGISTER; i < regs_num; i++)
+    if (lra_reg_info[i].nrefs != 0 && lra_get_regno_hard_regno (i) < 0
+	/* We do not want to assign memory for former scratches.  */
+	&& ! lra_former_scratch_p (i))
+      pseudo_regnos[n++] = i;
+  lra_assert (n > 0);
+  pseudo_slots = XNEWVEC (struct pseudo_slot, regs_num);
+  for (i = FIRST_PSEUDO_REGISTER; i < regs_num; i++)
+    {
+      spill_hard_reg[i] = NULL_RTX;
+      pseudo_slots[i].mem = NULL_RTX;
+    }
+  slots = XNEWVEC (struct slot, regs_num);
+  /* Sort regnos according their usage frequencies.  */
+  qsort (pseudo_regnos, n, sizeof (int), regno_freq_compare);
+  n = assign_spill_hard_regs (pseudo_regnos, n);
+  assign_stack_slot_num_and_sort_pseudos (pseudo_regnos, n);
+  for (i = 0; i < n; i++)
+    if (pseudo_slots[pseudo_regnos[i]].mem == NULL_RTX)
+      assign_mem_slot (pseudo_regnos[i]);
+  if (n > 0 && crtl->stack_alignment_needed)
+    /* If we have a stack frame, we must align it now.  The stack size
+       may be a part of the offset computation for register
+       elimination.  */
+    assign_stack_local (BLKmode, 0, crtl->stack_alignment_needed);
+  if (lra_dump_file != NULL)
+    {
+      for (i = 0; i < slots_num; i++)
+	{
+	  fprintf (lra_dump_file, "  Slot %d regnos (width = %d):", i,
+		   GET_MODE_SIZE (GET_MODE (slots[i].mem)));
+	  for (curr_regno = slots[i].regno;;
+	       curr_regno = pseudo_slots[curr_regno].next - pseudo_slots)
+	    {
+	      fprintf (lra_dump_file, "	 %d", curr_regno);
+	      if (pseudo_slots[curr_regno].next == NULL)
+		break;
+	    }
+	  fprintf (lra_dump_file, "\n");
+	}
+    }
+  spill_pseudos ();
+  free (slots);
+  free (pseudo_slots);
+  free (pseudo_regnos);
+  free (spill_hard_reg);
+}
+
+/* Apply alter_subreg for subregs of regs in *LOC.  Use FINAL_P for
+   alter_subreg calls. Return true if any subreg of reg is
+   processed.  */
+static bool
+alter_subregs (rtx *loc, bool final_p)
+{
+  int i;
+  rtx x = *loc;
+  bool res;
+  const char *fmt;
+  enum rtx_code code;
+
+  if (x == NULL_RTX)
+    return false;
+  code = GET_CODE (x);
+  if (code == SUBREG && REG_P (SUBREG_REG (x)))
+    {
+      lra_assert (REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER);
+      alter_subreg (loc, final_p);
+      return true;
+    }
+  fmt = GET_RTX_FORMAT (code);
+  res = false;
+  for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+    {
+      if (fmt[i] == 'e')
+	{
+	  if (alter_subregs (&XEXP (x, i), final_p))
+	    res = true;
+	}
+      else if (fmt[i] == 'E')
+	{
+	  int j;
+
+	  for (j = XVECLEN (x, i) - 1; j >= 0; j--)
+	    if (alter_subregs (&XVECEXP (x, i, j), final_p))
+	      res = true;
+	}
+    }
+  return res;
+}
+
+/* Return true if REGNO is used for return in the current
+   function.  */
+static bool
+return_regno_p (unsigned int regno)
+{
+  rtx outgoing = crtl->return_rtx;
+
+  if (! outgoing)
+    return false;
+
+  if (REG_P (outgoing))
+    return REGNO (outgoing) == regno;
+  else if (GET_CODE (outgoing) == PARALLEL)
+    {
+      int i;
+
+      for (i = 0; i < XVECLEN (outgoing, 0); i++)
+	{
+	  rtx x = XEXP (XVECEXP (outgoing, 0, i), 0);
+
+	  if (REG_P (x) && REGNO (x) == regno)
+	    return true;
+	}
+    }
+  return false;
+}
+
+/* Return true if REGNO is in one of subsequent USE after INSN in the
+   same BB.  */
+static bool
+regno_in_use_p (rtx_insn *insn, unsigned int regno)
+{
+  static lra_insn_recog_data_t id;
+  static struct lra_static_insn_data *static_id;
+  struct lra_insn_reg *reg;
+  int i, arg_regno;
+  basic_block bb = BLOCK_FOR_INSN (insn);
+
+  while ((insn = next_nondebug_insn (insn)) != NULL_RTX)
+    {
+      if (BARRIER_P (insn) || bb != BLOCK_FOR_INSN (insn))
+	return false;
+      if (! INSN_P (insn))
+	continue;
+      if (GET_CODE (PATTERN (insn)) == USE
+	  && REG_P (XEXP (PATTERN (insn), 0))
+	  && regno == REGNO (XEXP (PATTERN (insn), 0)))
+	return true;
+      /* Check that the regno is not modified.  */
+      id = lra_get_insn_recog_data (insn);
+      for (reg = id->regs; reg != NULL; reg = reg->next)
+	if (reg->type != OP_IN && reg->regno == (int) regno)
+	  return false;
+      static_id = id->insn_static_data;
+      for (reg = static_id->hard_regs; reg != NULL; reg = reg->next)
+	if (reg->type != OP_IN && reg->regno == (int) regno)
+	  return false;
+      if (id->arg_hard_regs != NULL)
+	for (i = 0; (arg_regno = id->arg_hard_regs[i]) >= 0; i++)
+	  if ((int) regno == (arg_regno >= FIRST_PSEUDO_REGISTER
+			      ? arg_regno : arg_regno - FIRST_PSEUDO_REGISTER))
+	    return false;
+    }
+  return false;
+}
+
+/* Final change of pseudos got hard registers into the corresponding
+   hard registers and removing temporary clobbers.  */
+void
+lra_final_code_change (void)
+{
+  int i, hard_regno;
+  basic_block bb;
+  rtx_insn *insn, *curr;
+  int max_regno = max_reg_num ();
+
+  for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
+    if (lra_reg_info[i].nrefs != 0
+	&& (hard_regno = lra_get_regno_hard_regno (i)) >= 0)
+      SET_REGNO (regno_reg_rtx[i], hard_regno);
+  FOR_EACH_BB_FN (bb, cfun)
+    FOR_BB_INSNS_SAFE (bb, insn, curr)
+      if (INSN_P (insn))
+	{
+	  rtx pat = PATTERN (insn);
+
+	  if (GET_CODE (pat) == CLOBBER && LRA_TEMP_CLOBBER_P (pat))
+	    {
+	      /* Remove clobbers temporarily created in LRA.  We don't
+		 need them anymore and don't want to waste compiler
+		 time processing them in a few subsequent passes.  */
+	      lra_invalidate_insn_data (insn);
+	      delete_insn (insn);
+	      continue;
+	    }
+
+	  /* IRA can generate move insns involving pseudos.  It is
+	     better remove them earlier to speed up compiler a bit.
+	     It is also better to do it here as they might not pass
+	     final RTL check in LRA, (e.g. insn moving a control
+	     register into itself).  So remove an useless move insn
+	     unless next insn is USE marking the return reg (we should
+	     save this as some subsequent optimizations assume that
+	     such original insns are saved).  */
+	  if (NONJUMP_INSN_P (insn) && GET_CODE (pat) == SET
+	      && REG_P (SET_SRC (pat)) && REG_P (SET_DEST (pat))
+	      && REGNO (SET_SRC (pat)) == REGNO (SET_DEST (pat))
+	      && (! return_regno_p (REGNO (SET_SRC (pat)))
+		  || ! regno_in_use_p (insn, REGNO (SET_SRC (pat)))))
+	    {
+	      lra_invalidate_insn_data (insn);
+	      delete_insn (insn);
+	      continue;
+	    }
+	
+	  lra_insn_recog_data_t id = lra_get_insn_recog_data (insn);
+	  struct lra_insn_reg *reg;
+
+	  for (reg = id->regs; reg != NULL; reg = reg->next)
+	    if (reg->regno >= FIRST_PSEUDO_REGISTER
+		&& lra_reg_info [reg->regno].nrefs == 0)
+	      break;
+	  
+	  if (reg != NULL)
+	    {
+	      /* Pseudos still can be in debug insns in some very rare
+		 and complicated cases, e.g. the pseudo was removed by
+		 inheritance and the debug insn is not EBBs where the
+		 inheritance happened.  It is difficult and time
+		 consuming to find what hard register corresponds the
+		 pseudo -- so just remove the debug insn.  Another
+		 solution could be assigning hard reg/memory but it
+		 would be a misleading info.  It is better not to have
+		 info than have it wrong.  */
+	      lra_assert (DEBUG_INSN_P (insn));
+	      lra_invalidate_insn_data (insn);
+	      delete_insn (insn);
+	      continue;
+	    }
+	  
+	  struct lra_static_insn_data *static_id = id->insn_static_data;
+	  bool insn_change_p = false;
+
+	  for (i = id->insn_static_data->n_operands - 1; i >= 0; i--)
+	    if ((DEBUG_INSN_P (insn) || ! static_id->operand[i].is_operator)
+		&& alter_subregs (id->operand_loc[i], ! DEBUG_INSN_P (insn)))
+	      {
+		lra_update_dup (id, i);
+		insn_change_p = true;
+	      }
+	  if (insn_change_p)
+	    lra_update_operator_dups (id);
+	}
+}