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BranchCommit messageAuthorAge
alpha-portsome infoHelge Deller2 years
bigfontparisc/STI: Add TER16x32 fontHelge Deller3 years
develupdateHelge Deller3 months
devel-2022parisc: Add opt/hostid fw_cfg option to change hostidHelge Deller3 years
devel-4-do-not-usepdc update und boot disc rewriteHelge Deller10 months
devel-btlbbtlb: Fix all, everything ok.Helge Deller11 months
devel-btlb-2parisc: SEABIOS_HPPA_VERSION 9Helge Deller11 months
devel-last-for-v16Linux boots again on all.Helge Deller7 months
devel-with-sti64bitparisc: Remove exec flag from hppa-firmware.imgHelge Deller4 months
devel2small cleanupsHelge Deller10 months
devel3convert to new pdc.hHelge Deller10 months
devel4parisc: ad .vimrc editor helper fileHelge Deller10 months
devel5parisc: SEABIOS_HPPA_VERSION 10Helge Deller10 months
devel64parisc: Detect Astro Runway port and CPUsHelge Deller10 months
hp3000parisc: Identing updatesHelge Deller22 months
hp3000-consoletemp workHelge Deller21 months
hppa-reboot-fixparisc: SEABIOS_HPPA_VERSION 8Helge Deller14 months
hppa-targetata.c: Add missing endianess conversion functionsHelge Deller4 years
hppa-target-2parisc: Increase SEABIOS_HPPA_VERSION to version 2Helge Deller3 years
masterparisc: Fix 64-bit PDC call to not trash %dpHelge Deller6 months
master-new-v7parisc: SEABIOS_HPPA_VERSION 7Helge Deller14 months
master-oldparisc: Alloc any font size with STI font_unpmv functionHelge Deller4 years
parisc-qemu-4.1.0Merge pull request #4 from svenschnelle/parisc-qemu-4.1.0Helge Deller5 years
parisc-qemu-5.0parisc: Add soft power switch button emulation for QEMUHelge Deller4 years
parisc-qemu-5.1parisc: Move power switch button to firmware areaHelge Deller4 years
parisc-qemu-5.1-nextparisc: Make power switch button configurable from qemuHelge Deller4 years
parisc-qemu-6parisc: Increase SEABIOS_HPPA_VERSION to version 2Helge Deller3 years
parisc_firmwareImprove debug messages, code indenting, TOD accuracyHelge Deller5 years
seabios-hppa-v3-rcparisc: SEABIOS_HPPA_VERSION 3Helge Deller3 years
seabios-hppa-v3-rc2parisc: SEABIOS_HPPA_VERSION 3Helge Deller3 years
serial-port-fix-testparisc: SEABIOS_HPPA_VERSION 6Helge Deller2 years
toc-supportparisc: SEABIOS_HPPA_VERSION 3Helge Deller3 years
upstreamtcgbios: Disable platform hierarchy in case of failureStefan Berger3 years
v6-testparisc: SEABIOS_HPPA_VERSION 6Helge Deller2 years
 
TagDownloadAuthorAge
seabios-hppa-v15seabios-hppa-v15.zip  seabios-hppa-v15.tar.gz  seabios-hppa-v15.tar.bz2  Helge Deller7 months
seabios-hppa-v14seabios-hppa-v14.zip  seabios-hppa-v14.tar.gz  seabios-hppa-v14.tar.bz2  Helge Deller7 months
seabios-hppa-v13seabios-hppa-v13.zip  seabios-hppa-v13.tar.gz  seabios-hppa-v13.tar.bz2  Helge Deller9 months
seabios-hppa-v12seabios-hppa-v12.zip  seabios-hppa-v12.tar.gz  seabios-hppa-v12.tar.bz2  Helge Deller9 months
seabios-hppa-v10seabios-hppa-v10.zip  seabios-hppa-v10.tar.gz  seabios-hppa-v10.tar.bz2  Helge Deller10 months
seabios-hppa-v9seabios-hppa-v9.zip  seabios-hppa-v9.tar.gz  seabios-hppa-v9.tar.bz2  Helge Deller11 months
seabios-hppa-v8seabios-hppa-v8.zip  seabios-hppa-v8.tar.gz  seabios-hppa-v8.tar.bz2  Helge Deller14 months
seabios-hppa-v7seabios-hppa-v7.zip  seabios-hppa-v7.tar.gz  seabios-hppa-v7.tar.bz2  Helge Deller14 months
seabios-hppa-v6seabios-hppa-v6.zip  seabios-hppa-v6.tar.gz  seabios-hppa-v6.tar.bz2  Helge Deller2 years
seabios-hppa-v5seabios-hppa-v5.zip  seabios-hppa-v5.tar.gz  seabios-hppa-v5.tar.bz2  Helge Deller2 years
seabios-hppa-v4seabios-hppa-v4.zip  seabios-hppa-v4.tar.gz  seabios-hppa-v4.tar.bz2  Helge Deller2 years
seabios-hppa-v3seabios-hppa-v3.zip  seabios-hppa-v3.tar.gz  seabios-hppa-v3.tar.bz2  Helge Deller3 years
seabios-hppa-v2seabios-hppa-v2.zip  seabios-hppa-v2.tar.gz  seabios-hppa-v2.tar.bz2  Helge Deller3 years
hppa-qemu-5.2-2seabios-hppa-hppa-qemu-5.2-2.zip  seabios-hppa-hppa-qemu-5.2-2.tar.gz  seabios-hppa-hppa-qemu-5.2-2.tar.bz2  Helge Deller4 years
hppa-qemu-5.2-1seabios-hppa-hppa-qemu-5.2-1.zip  seabios-hppa-hppa-qemu-5.2-1.tar.gz  seabios-hppa-hppa-qemu-5.2-1.tar.bz2  Helge Deller4 years
rel-1.10.2seabios-hppa-rel-1.10.2.zip  seabios-hppa-rel-1.10.2.tar.gz  seabios-hppa-rel-1.10.2.tar.bz2  Ben Warren7 years
rel-1.10.1seabios-hppa-rel-1.10.1.zip  seabios-hppa-rel-1.10.1.tar.gz  seabios-hppa-rel-1.10.1.tar.bz2  Igor Mammedov8 years
rel-1.10.0seabios-hppa-rel-1.10.0.zip  seabios-hppa-rel-1.10.0.tar.gz  seabios-hppa-rel-1.10.0.tar.bz2  Kevin O'Connor8 years
rel-1.9.3seabios-hppa-rel-1.9.3.zip  seabios-hppa-rel-1.9.3.tar.gz  seabios-hppa-rel-1.9.3.tar.bz2  Haozhong Zhang8 years
rel-1.9.2seabios-hppa-rel-1.9.2.zip  seabios-hppa-rel-1.9.2.tar.gz  seabios-hppa-rel-1.9.2.tar.bz2  Marcel Apfelbaum8 years
rel-1.9.1seabios-hppa-rel-1.9.1.zip  seabios-hppa-rel-1.9.1.tar.gz  seabios-hppa-rel-1.9.1.tar.bz2  Cole Robinson9 years
rel-1.9.0seabios-hppa-rel-1.9.0.zip  seabios-hppa-rel-1.9.0.tar.gz  seabios-hppa-rel-1.9.0.tar.bz2  Kevin O'Connor9 years
rel-1.8.2seabios-hppa-rel-1.8.2.zip  seabios-hppa-rel-1.8.2.tar.gz  seabios-hppa-rel-1.8.2.tar.bz2  Kevin O'Connor9 years
rel-1.8.1seabios-hppa-rel-1.8.1.zip  seabios-hppa-rel-1.8.1.tar.gz  seabios-hppa-rel-1.8.1.tar.bz2  Kevin O'Connor9 years
rel-1.8.0seabios-hppa-rel-1.8.0.zip  seabios-hppa-rel-1.8.0.tar.gz  seabios-hppa-rel-1.8.0.tar.bz2  Kevin O'Connor10 years
rel-1.7.5.2seabios-hppa-rel-1.7.5.2.zip  seabios-hppa-rel-1.7.5.2.tar.gz  seabios-hppa-rel-1.7.5.2.tar.bz2  Kevin O'Connor10 years
rel-1.7.5.1seabios-hppa-rel-1.7.5.1.zip  seabios-hppa-rel-1.7.5.1.tar.gz  seabios-hppa-rel-1.7.5.1.tar.bz2  Hannes Reinecke10 years
rel-1.7.5seabios-hppa-rel-1.7.5.zip  seabios-hppa-rel-1.7.5.tar.gz  seabios-hppa-rel-1.7.5.tar.bz2  Kevin O'Connor10 years
rel-1.7.5-rc1seabios-hppa-rel-1.7.5-rc1.zip  seabios-hppa-rel-1.7.5-rc1.tar.gz  seabios-hppa-rel-1.7.5-rc1.tar.bz2  Kevin O'Connor10 years
rel-1.7.4seabios-hppa-rel-1.7.4.zip  seabios-hppa-rel-1.7.4.tar.gz  seabios-hppa-rel-1.7.4.tar.bz2  Kevin O'Connor11 years
rel-1.7.3.2seabios-hppa-rel-1.7.3.2.zip  seabios-hppa-rel-1.7.3.2.tar.gz  seabios-hppa-rel-1.7.3.2.tar.bz2  Gerd Hoffmann11 years
rel-1.7.3.1seabios-hppa-rel-1.7.3.1.zip  seabios-hppa-rel-1.7.3.1.tar.gz  seabios-hppa-rel-1.7.3.1.tar.bz2  Kevin O'Connor11 years
rel-1.7.3seabios-hppa-rel-1.7.3.zip  seabios-hppa-rel-1.7.3.tar.gz  seabios-hppa-rel-1.7.3.tar.bz2  Kevin O'Connor11 years
rel-1.7.2.2seabios-hppa-rel-1.7.2.2.zip  seabios-hppa-rel-1.7.2.2.tar.gz  seabios-hppa-rel-1.7.2.2.tar.bz2  Kevin O'Connor11 years
rel-1.7.2.1seabios-hppa-rel-1.7.2.1.zip  seabios-hppa-rel-1.7.2.1.tar.gz  seabios-hppa-rel-1.7.2.1.tar.bz2  Alex Williamson11 years
rel-1.7.2seabios-hppa-rel-1.7.2.zip  seabios-hppa-rel-1.7.2.tar.gz  seabios-hppa-rel-1.7.2.tar.bz2  Paolo Bonzini12 years
rel-1.7.1seabios-hppa-rel-1.7.1.zip  seabios-hppa-rel-1.7.1.tar.gz  seabios-hppa-rel-1.7.1.tar.bz2  Kevin O'Connor12 years
rel-1.7.0seabios-hppa-rel-1.7.0.zip  seabios-hppa-rel-1.7.0.tar.gz  seabios-hppa-rel-1.7.0.tar.bz2  Kevin O'Connor12 years
rel-1.6.3.2seabios-hppa-rel-1.6.3.2.zip  seabios-hppa-rel-1.6.3.2.tar.gz  seabios-hppa-rel-1.6.3.2.tar.bz2  Kevin O'Connor12 years
rel-1.6.3.1seabios-hppa-rel-1.6.3.1.zip  seabios-hppa-rel-1.6.3.1.tar.gz  seabios-hppa-rel-1.6.3.1.tar.bz2  Kevin O'Connor13 years
rel-1.6.3seabios-hppa-rel-1.6.3.zip  seabios-hppa-rel-1.6.3.tar.gz  seabios-hppa-rel-1.6.3.tar.bz2  Kevin O'Connor13 years
rel-0.6.2seabios-hppa-rel-0.6.2.zip  seabios-hppa-rel-0.6.2.tar.gz  seabios-hppa-rel-0.6.2.tar.bz2  Kevin O'Connor13 years
rel-0.6.1.3seabios-hppa-rel-0.6.1.3.zip  seabios-hppa-rel-0.6.1.3.tar.gz  seabios-hppa-rel-0.6.1.3.tar.bz2  Kevin O'Connor14 years
rel-0.6.1.2seabios-hppa-rel-0.6.1.2.zip  seabios-hppa-rel-0.6.1.2.tar.gz  seabios-hppa-rel-0.6.1.2.tar.bz2  Kevin O'Connor14 years
rel-0.6.1.1seabios-hppa-rel-0.6.1.1.zip  seabios-hppa-rel-0.6.1.1.tar.gz  seabios-hppa-rel-0.6.1.1.tar.bz2  Kevin O'Connor14 years
rel-0.6.1seabios-hppa-rel-0.6.1.zip  seabios-hppa-rel-0.6.1.tar.gz  seabios-hppa-rel-0.6.1.tar.bz2  Kevin O'Connor14 years
rel-0.6.0seabios-hppa-rel-0.6.0.zip  seabios-hppa-rel-0.6.0.tar.gz  seabios-hppa-rel-0.6.0.tar.bz2  Kevin O'Connor14 years
rel-0.5.1seabios-hppa-rel-0.5.1.zip  seabios-hppa-rel-0.5.1.tar.gz  seabios-hppa-rel-0.5.1.tar.bz2  Kevin O'Connor15 years
rel-0.5.0seabios-hppa-rel-0.5.0.zip  seabios-hppa-rel-0.5.0.tar.gz  seabios-hppa-rel-0.5.0.tar.bz2  Kevin O'Connor15 years
rel-0.4.2seabios-hppa-rel-0.4.2.zip  seabios-hppa-rel-0.4.2.tar.gz  seabios-hppa-rel-0.4.2.tar.bz2  Kevin O'Connor15 years
rel-0.4.1seabios-hppa-rel-0.4.1.zip  seabios-hppa-rel-0.4.1.tar.gz  seabios-hppa-rel-0.4.1.tar.bz2  Kevin O'Connor15 years
rel-0.4.0seabios-hppa-rel-0.4.0.zip  seabios-hppa-rel-0.4.0.tar.gz  seabios-hppa-rel-0.4.0.tar.bz2  Kevin O'Connor16 years
rel-0.3.0seabios-hppa-rel-0.3.0.zip  seabios-hppa-rel-0.3.0.tar.gz  seabios-hppa-rel-0.3.0.tar.bz2  Kevin O'Connor16 years
rel-0.2.3seabios-hppa-rel-0.2.3.zip  seabios-hppa-rel-0.2.3.tar.gz  seabios-hppa-rel-0.2.3.tar.bz2  Kevin O'Connor16 years
rel-0.2.2seabios-hppa-rel-0.2.2.zip  seabios-hppa-rel-0.2.2.tar.gz  seabios-hppa-rel-0.2.2.tar.bz2  Kevin O'Connor16 years
rel-0.2.1seabios-hppa-rel-0.2.1.zip  seabios-hppa-rel-0.2.1.tar.gz  seabios-hppa-rel-0.2.1.tar.bz2  Kevin O'Connor16 years
rel-0.2.0seabios-hppa-rel-0.2.0.zip  seabios-hppa-rel-0.2.0.tar.gz  seabios-hppa-rel-0.2.0.tar.bz2  Kevin O'Connor16 years
rel-0.1.3seabios-hppa-rel-0.1.3.zip  seabios-hppa-rel-0.1.3.tar.gz  seabios-hppa-rel-0.1.3.tar.bz2  Kevin O'Connor16 years
rel-0.1.2seabios-hppa-rel-0.1.2.zip  seabios-hppa-rel-0.1.2.tar.gz  seabios-hppa-rel-0.1.2.tar.bz2  Kevin O'Connor16 years
rel-0.1.1seabios-hppa-rel-0.1.1.zip  seabios-hppa-rel-0.1.1.tar.gz  seabios-hppa-rel-0.1.1.tar.bz2  Kevin O'Connor16 years
rel-0.1.0seabios-hppa-rel-0.1.0.zip  seabios-hppa-rel-0.1.0.tar.gz  seabios-hppa-rel-0.1.0.tar.bz2  Kevin O'Connor16 years
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/* Move registers around to reduce number of move instructions needed.
   Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.

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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */


/* This module looks for cases where matching constraints would force
   an instruction to need a reload, and this reload would be a register
   to register move.  It then attempts to change the registers used by the
   instruction to avoid the move instruction.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h" /* stdio.h must precede rtl.h for FFS.  */
#include "tm_p.h"
#include "insn-config.h"
#include "recog.h"
#include "output.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "flags.h"
#include "function.h"
#include "expr.h"
#include "basic-block.h"
#include "except.h"
#include "toplev.h"
#include "reload.h"


/* Turn STACK_GROWS_DOWNWARD into a boolean.  */
#ifdef STACK_GROWS_DOWNWARD
#undef STACK_GROWS_DOWNWARD
#define STACK_GROWS_DOWNWARD 1
#else
#define STACK_GROWS_DOWNWARD 0
#endif

static int perhaps_ends_bb_p (rtx);
static int optimize_reg_copy_1 (rtx, rtx, rtx);
static void optimize_reg_copy_2 (rtx, rtx, rtx);
static void optimize_reg_copy_3 (rtx, rtx, rtx);
static void copy_src_to_dest (rtx, rtx, rtx, int);
static int *regmove_bb_head;

struct match {
  int with[MAX_RECOG_OPERANDS];
  enum { READ, WRITE, READWRITE } use[MAX_RECOG_OPERANDS];
  int commutative[MAX_RECOG_OPERANDS];
  int early_clobber[MAX_RECOG_OPERANDS];
};

static rtx discover_flags_reg (void);
static void mark_flags_life_zones (rtx);
static void flags_set_1 (rtx, rtx, void *);

static int try_auto_increment (rtx, rtx, rtx, rtx, HOST_WIDE_INT, int);
static int find_matches (rtx, struct match *);
static void replace_in_call_usage (rtx *, unsigned int, rtx, rtx);
static int fixup_match_1 (rtx, rtx, rtx, rtx, rtx, int, int, int, FILE *);
static int reg_is_remote_constant_p (rtx, rtx, rtx);
static int stable_and_no_regs_but_for_p (rtx, rtx, rtx);
static int regclass_compatible_p (int, int);
static int replacement_quality (rtx);
static int fixup_match_2 (rtx, rtx, rtx, rtx, FILE *);

/* Return nonzero if registers with CLASS1 and CLASS2 can be merged without
   causing too much register allocation problems.  */
static int
regclass_compatible_p (int class0, int class1)
{
  return (class0 == class1
	  || (reg_class_subset_p (class0, class1)
	      && ! CLASS_LIKELY_SPILLED_P (class0))
	  || (reg_class_subset_p (class1, class0)
	      && ! CLASS_LIKELY_SPILLED_P (class1)));
}

/* INC_INSN is an instruction that adds INCREMENT to REG.
   Try to fold INC_INSN as a post/pre in/decrement into INSN.
   Iff INC_INSN_SET is nonzero, inc_insn has a destination different from src.
   Return nonzero for success.  */
static int
try_auto_increment (rtx insn, rtx inc_insn, rtx inc_insn_set, rtx reg,
		    HOST_WIDE_INT increment, int pre)
{
  enum rtx_code inc_code;

  rtx pset = single_set (insn);
  if (pset)
    {
      /* Can't use the size of SET_SRC, we might have something like
	 (sign_extend:SI (mem:QI ...  */
      rtx use = find_use_as_address (pset, reg, 0);
      if (use != 0 && use != (rtx) (size_t) 1)
	{
	  int size = GET_MODE_SIZE (GET_MODE (use));
	  if (0
	      || (HAVE_POST_INCREMENT
		  && pre == 0 && (inc_code = POST_INC, increment == size))
	      || (HAVE_PRE_INCREMENT
		  && pre == 1 && (inc_code = PRE_INC, increment == size))
	      || (HAVE_POST_DECREMENT
		  && pre == 0 && (inc_code = POST_DEC, increment == -size))
	      || (HAVE_PRE_DECREMENT
		  && pre == 1 && (inc_code = PRE_DEC, increment == -size))
	  )
	    {
	      if (inc_insn_set)
		validate_change
		  (inc_insn,
		   &SET_SRC (inc_insn_set),
		   XEXP (SET_SRC (inc_insn_set), 0), 1);
	      validate_change (insn, &XEXP (use, 0),
			       gen_rtx_fmt_e (inc_code, Pmode, reg), 1);
	      if (apply_change_group ())
		{
		  /* If there is a REG_DEAD note on this insn, we must
		     change this not to REG_UNUSED meaning that the register
		     is set, but the value is dead.  Failure to do so will
		     result in a sched1 abort -- when it recomputes lifetime
		     information, the number of REG_DEAD notes will have
		     changed.  */
		  rtx note = find_reg_note (insn, REG_DEAD, reg);
		  if (note)
		    PUT_MODE (note, REG_UNUSED);

		  REG_NOTES (insn)
		    = gen_rtx_EXPR_LIST (REG_INC,
					 reg, REG_NOTES (insn));
		  if (! inc_insn_set)
		    delete_insn (inc_insn);
		  return 1;
		}
	    }
	}
    }
  return 0;
}

/* Determine if the pattern generated by add_optab has a clobber,
   such as might be issued for a flags hard register.  To make the
   code elsewhere simpler, we handle cc0 in this same framework.

   Return the register if one was discovered.  Return NULL_RTX if
   if no flags were found.  Return pc_rtx if we got confused.  */

static rtx
discover_flags_reg (void)
{
  rtx tmp;
  tmp = gen_rtx_REG (word_mode, 10000);
  tmp = gen_add3_insn (tmp, tmp, const2_rtx);

  /* If we get something that isn't a simple set, or a
     [(set ..) (clobber ..)], this whole function will go wrong.  */
  if (GET_CODE (tmp) == SET)
    return NULL_RTX;
  else if (GET_CODE (tmp) == PARALLEL)
    {
      int found;

      if (XVECLEN (tmp, 0) != 2)
	return pc_rtx;
      tmp = XVECEXP (tmp, 0, 1);
      if (GET_CODE (tmp) != CLOBBER)
	return pc_rtx;
      tmp = XEXP (tmp, 0);

      /* Don't do anything foolish if the md wanted to clobber a
	 scratch or something.  We only care about hard regs.
	 Moreover we don't like the notion of subregs of hard regs.  */
      if (GET_CODE (tmp) == SUBREG
	  && REG_P (SUBREG_REG (tmp))
	  && REGNO (SUBREG_REG (tmp)) < FIRST_PSEUDO_REGISTER)
	return pc_rtx;
      found = (REG_P (tmp) && REGNO (tmp) < FIRST_PSEUDO_REGISTER);

      return (found ? tmp : NULL_RTX);
    }

  return pc_rtx;
}

/* It is a tedious task identifying when the flags register is live and
   when it is safe to optimize.  Since we process the instruction stream
   multiple times, locate and record these live zones by marking the
   mode of the instructions --

   QImode is used on the instruction at which the flags becomes live.

   HImode is used within the range (exclusive) that the flags are
   live.  Thus the user of the flags is not marked.

   All other instructions are cleared to VOIDmode.  */

/* Used to communicate with flags_set_1.  */
static rtx flags_set_1_rtx;
static int flags_set_1_set;

static void
mark_flags_life_zones (rtx flags)
{
  int flags_regno;
  int flags_nregs;
  basic_block block;

#ifdef HAVE_cc0
  /* If we found a flags register on a cc0 host, bail.  */
  if (flags == NULL_RTX)
    flags = cc0_rtx;
  else if (flags != cc0_rtx)
    flags = pc_rtx;
#endif

  /* Simple cases first: if no flags, clear all modes.  If confusing,
     mark the entire function as being in a flags shadow.  */
  if (flags == NULL_RTX || flags == pc_rtx)
    {
      enum machine_mode mode = (flags ? HImode : VOIDmode);
      rtx insn;
      for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
	PUT_MODE (insn, mode);
      return;
    }

#ifdef HAVE_cc0
  flags_regno = -1;
  flags_nregs = 1;
#else
  flags_regno = REGNO (flags);
  flags_nregs = hard_regno_nregs[flags_regno][GET_MODE (flags)];
#endif
  flags_set_1_rtx = flags;

  /* Process each basic block.  */
  FOR_EACH_BB_REVERSE (block)
    {
      rtx insn, end;
      int live;

      insn = BB_HEAD (block);
      end = BB_END (block);

      /* Look out for the (unlikely) case of flags being live across
	 basic block boundaries.  */
      live = 0;
#ifndef HAVE_cc0
      {
	int i;
	for (i = 0; i < flags_nregs; ++i)
	  live |= REGNO_REG_SET_P (block->global_live_at_start,
				   flags_regno + i);
      }
#endif

      while (1)
	{
	  /* Process liveness in reverse order of importance --
	     alive, death, birth.  This lets more important info
	     overwrite the mode of lesser info.  */

	  if (INSN_P (insn))
	    {
#ifdef HAVE_cc0
	      /* In the cc0 case, death is not marked in reg notes,
		 but is instead the mere use of cc0 when it is alive.  */
	      if (live && reg_mentioned_p (cc0_rtx, PATTERN (insn)))
		live = 0;
#else
	      /* In the hard reg case, we watch death notes.  */
	      if (live && find_regno_note (insn, REG_DEAD, flags_regno))
		live = 0;
#endif
	      PUT_MODE (insn, (live ? HImode : VOIDmode));

	      /* In either case, birth is denoted simply by its presence
		 as the destination of a set.  */
	      flags_set_1_set = 0;
	      note_stores (PATTERN (insn), flags_set_1, NULL);
	      if (flags_set_1_set)
		{
		  live = 1;
		  PUT_MODE (insn, QImode);
		}
	    }
	  else
	    PUT_MODE (insn, (live ? HImode : VOIDmode));

	  if (insn == end)
	    break;
	  insn = NEXT_INSN (insn);
	}
    }
}

/* A subroutine of mark_flags_life_zones, called through note_stores.  */

static void
flags_set_1 (rtx x, rtx pat, void *data ATTRIBUTE_UNUSED)
{
  if (GET_CODE (pat) == SET
      && reg_overlap_mentioned_p (x, flags_set_1_rtx))
    flags_set_1_set = 1;
}

static int *regno_src_regno;

/* Indicate how good a choice REG (which appears as a source) is to replace
   a destination register with.  The higher the returned value, the better
   the choice.  The main objective is to avoid using a register that is
   a candidate for tying to a hard register, since the output might in
   turn be a candidate to be tied to a different hard register.  */
static int
replacement_quality (rtx reg)
{
  int src_regno;

  /* Bad if this isn't a register at all.  */
  if (!REG_P (reg))
    return 0;

  /* If this register is not meant to get a hard register,
     it is a poor choice.  */
  if (REG_LIVE_LENGTH (REGNO (reg)) < 0)
    return 0;

  src_regno = regno_src_regno[REGNO (reg)];

  /* If it was not copied from another register, it is fine.  */
  if (src_regno < 0)
    return 3;

  /* Copied from a hard register?  */
  if (src_regno < FIRST_PSEUDO_REGISTER)
    return 1;

  /* Copied from a pseudo register - not as bad as from a hard register,
     yet still cumbersome, since the register live length will be lengthened
     when the registers get tied.  */
  return 2;
}

/* Return 1 if INSN might end a basic block.  */

static int perhaps_ends_bb_p (rtx insn)
{
  switch (GET_CODE (insn))
    {
    case CODE_LABEL:
    case JUMP_INSN:
      /* These always end a basic block.  */
      return 1;

    case CALL_INSN:
      /* A CALL_INSN might be the last insn of a basic block, if it is inside
	 an EH region or if there are nonlocal gotos.  Note that this test is
	 very conservative.  */
      if (nonlocal_goto_handler_labels)
	return 1;
      /* Fall through.  */
    default:
      return can_throw_internal (insn);
    }
}

/* INSN is a copy from SRC to DEST, both registers, and SRC does not die
   in INSN.

   Search forward to see if SRC dies before either it or DEST is modified,
   but don't scan past the end of a basic block.  If so, we can replace SRC
   with DEST and let SRC die in INSN.

   This will reduce the number of registers live in that range and may enable
   DEST to be tied to SRC, thus often saving one register in addition to a
   register-register copy.  */

static int
optimize_reg_copy_1 (rtx insn, rtx dest, rtx src)
{
  rtx p, q;
  rtx note;
  rtx dest_death = 0;
  int sregno = REGNO (src);
  int dregno = REGNO (dest);

  /* We don't want to mess with hard regs if register classes are small.  */
  if (sregno == dregno
      || (SMALL_REGISTER_CLASSES
	  && (sregno < FIRST_PSEUDO_REGISTER
	      || dregno < FIRST_PSEUDO_REGISTER))
      /* We don't see all updates to SP if they are in an auto-inc memory
	 reference, so we must disallow this optimization on them.  */
      || sregno == STACK_POINTER_REGNUM || dregno == STACK_POINTER_REGNUM)
    return 0;

  for (p = NEXT_INSN (insn); p; p = NEXT_INSN (p))
    {
      /* ??? We can't scan past the end of a basic block without updating
	 the register lifetime info (REG_DEAD/basic_block_live_at_start).  */
      if (perhaps_ends_bb_p (p))
	break;