--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/genemit.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,909 @@
+/* Generate code from machine description to emit insns as rtl.
+   Copyright (C) 1987, 1988, 1991, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
+   2003, 2004, 2005, 2007, 2008 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 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/>.  */
+
+
+#include "bconfig.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "errors.h"
+#include "gensupport.h"
+
+
+static int max_opno;
+static int max_dup_opno;
+static int max_scratch_opno;
+static int insn_code_number;
+static int insn_index_number;
+
+/* Data structure for recording the patterns of insns that have CLOBBERs.
+   We use this to output a function that adds these CLOBBERs to a
+   previously-allocated PARALLEL expression.  */
+
+struct clobber_pat
+{
+  struct clobber_ent *insns;
+  rtx pattern;
+  int first_clobber;
+  struct clobber_pat *next;
+  int has_hard_reg;
+} *clobber_list;
+
+/* Records one insn that uses the clobber list.  */
+
+struct clobber_ent
+{
+  int code_number;		/* Counts only insns.  */
+  struct clobber_ent *next;
+};
+
+static void max_operand_1		(rtx);
+static int max_operand_vec		(rtx, int);
+static void print_code			(RTX_CODE);
+static void gen_exp			(rtx, enum rtx_code, char *);
+static void gen_insn			(rtx, int);
+static void gen_expand			(rtx);
+static void gen_split			(rtx);
+static void output_add_clobbers		(void);
+static void output_added_clobbers_hard_reg_p (void);
+static void gen_rtx_scratch		(rtx, enum rtx_code);
+static void output_peephole2_scratches	(rtx);
+
+
+static void
+max_operand_1 (rtx x)
+{
+  RTX_CODE code;
+  int i;
+  int len;
+  const char *fmt;
+
+  if (x == 0)
+    return;
+
+  code = GET_CODE (x);
+
+  if (code == MATCH_OPERAND || code == MATCH_OPERATOR
+      || code == MATCH_PARALLEL)
+    max_opno = MAX (max_opno, XINT (x, 0));
+  if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
+    max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
+  if (code == MATCH_SCRATCH)
+    max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
+
+  fmt = GET_RTX_FORMAT (code);
+  len = GET_RTX_LENGTH (code);
+  for (i = 0; i < len; i++)
+    {
+      if (fmt[i] == 'e' || fmt[i] == 'u')
+	max_operand_1 (XEXP (x, i));
+      else if (fmt[i] == 'E')
+	{
+	  int j;
+	  for (j = 0; j < XVECLEN (x, i); j++)
+	    max_operand_1 (XVECEXP (x, i, j));
+	}
+    }
+}
+
+static int
+max_operand_vec (rtx insn, int arg)
+{
+  int len = XVECLEN (insn, arg);
+  int i;
+
+  max_opno = -1;
+  max_dup_opno = -1;
+  max_scratch_opno = -1;
+
+  for (i = 0; i < len; i++)
+    max_operand_1 (XVECEXP (insn, arg, i));
+
+  return max_opno + 1;
+}
+
+static void
+print_code (RTX_CODE code)
+{
+  const char *p1;
+  for (p1 = GET_RTX_NAME (code); *p1; p1++)
+    putchar (TOUPPER(*p1));
+}
+
+static void
+gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
+{
+  if (subroutine_type == DEFINE_PEEPHOLE2)
+    {
+      printf ("operand%d", XINT (x, 0));
+    }
+  else
+    {
+      printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
+    }
+}
+
+/* Print a C expression to construct an RTX just like X,
+   substituting any operand references appearing within.  */
+
+static void
+gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
+{
+  RTX_CODE code;
+  int i;
+  int len;
+  const char *fmt;
+
+  if (x == 0)
+    {
+      printf ("NULL_RTX");
+      return;
+    }
+
+  code = GET_CODE (x);
+
+  switch (code)
+    {
+    case MATCH_OPERAND:
+    case MATCH_DUP:
+      if (used)
+	{
+	  if (used[XINT (x, 0)])
+	    {
+	      printf ("copy_rtx (operand%d)", XINT (x, 0));
+	      return;
+	    }
+	  used[XINT (x, 0)] = 1;
+	}
+      printf ("operand%d", XINT (x, 0));
+      return;
+
+    case MATCH_OP_DUP:
+      printf ("gen_rtx_fmt_");
+      for (i = 0; i < XVECLEN (x, 1); i++)
+	printf ("e");
+      printf (" (GET_CODE (operand%d), ", XINT (x, 0));
+      if (GET_MODE (x) == VOIDmode)
+	printf ("GET_MODE (operand%d)", XINT (x, 0));
+      else
+	printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
+      for (i = 0; i < XVECLEN (x, 1); i++)
+	{
+	  printf (",\n\t\t");
+	  gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
+	}
+      printf (")");
+      return;
+
+    case MATCH_OPERATOR:
+      printf ("gen_rtx_fmt_");
+      for (i = 0; i < XVECLEN (x, 2); i++)
+	printf ("e");
+      printf (" (GET_CODE (operand%d)", XINT (x, 0));
+      printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
+      for (i = 0; i < XVECLEN (x, 2); i++)
+	{
+	  printf (",\n\t\t");
+	  gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
+	}
+      printf (")");
+      return;
+
+    case MATCH_PARALLEL:
+    case MATCH_PAR_DUP:
+      printf ("operand%d", XINT (x, 0));
+      return;
+
+    case MATCH_SCRATCH:
+      gen_rtx_scratch (x, subroutine_type);
+      return;
+
+    case ADDRESS:
+      fatal ("ADDRESS expression code used in named instruction pattern");
+
+    case PC:
+      printf ("pc_rtx");
+      return;
+    case CLOBBER:
+      if (REG_P (XEXP (x, 0)))
+	{
+	  printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),
+			  			     REGNO (XEXP (x, 0)));
+	  return;
+	}
+      break;
+
+    case CC0:
+      printf ("cc0_rtx");
+      return;
+
+    case CONST_INT:
+      if (INTVAL (x) == 0)
+	printf ("const0_rtx");
+      else if (INTVAL (x) == 1)
+	printf ("const1_rtx");
+      else if (INTVAL (x) == -1)
+	printf ("constm1_rtx");
+      else if (-MAX_SAVED_CONST_INT <= INTVAL (x)
+	  && INTVAL (x) <= MAX_SAVED_CONST_INT)
+	printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",
+		(int) INTVAL (x));
+      else if (INTVAL (x) == STORE_FLAG_VALUE)
+	printf ("const_true_rtx");
+      else
+	{
+	  printf ("GEN_INT (");
+	  printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
+	  printf (")");
+	}
+      return;
+
+    case CONST_DOUBLE:
+    case CONST_FIXED:
+      /* These shouldn't be written in MD files.  Instead, the appropriate
+	 routines in varasm.c should be called.  */
+      gcc_unreachable ();
+
+    default:
+      break;
+    }
+
+  printf ("gen_rtx_");
+  print_code (code);
+  printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
+
+  fmt = GET_RTX_FORMAT (code);
+  len = GET_RTX_LENGTH (code);
+  for (i = 0; i < len; i++)
+    {
+      if (fmt[i] == '0')
+	break;
+      printf (",\n\t");
+      switch (fmt[i])
+	{
+	case 'e': case 'u':
+	  gen_exp (XEXP (x, i), subroutine_type, used);
+	  break;
+
+	case 'i':
+	  printf ("%u", XINT (x, i));
+	  break;
+
+	case 's':
+	  printf ("\"%s\"", XSTR (x, i));
+	  break;
+
+	case 'E':
+	  {
+	    int j;
+	    printf ("gen_rtvec (%d", XVECLEN (x, i));
+	    for (j = 0; j < XVECLEN (x, i); j++)
+	      {
+		printf (",\n\t\t");
+		gen_exp (XVECEXP (x, i, j), subroutine_type, used);
+	      }
+	    printf (")");
+	    break;
+	  }
+
+	default:
+	  gcc_unreachable ();
+	}
+    }
+  printf (")");
+}
+
+/* Generate the `gen_...' function for a DEFINE_INSN.  */
+
+static void
+gen_insn (rtx insn, int lineno)
+{
+  int operands;
+  int i;
+
+  /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
+     registers or MATCH_SCRATCHes.  If so, store away the information for
+     later.  */
+
+  if (XVEC (insn, 1))
+    {
+      int has_hard_reg = 0;
+
+      for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
+	{
+	  if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
+	    break;
+
+	  if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))
+	    has_hard_reg = 1;
+	  else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
+	    break;
+	}
+
+      if (i != XVECLEN (insn, 1) - 1)
+	{
+	  struct clobber_pat *p;
+	  struct clobber_ent *link = XNEW (struct clobber_ent);
+	  int j;
+
+	  link->code_number = insn_code_number;
+
+	  /* See if any previous CLOBBER_LIST entry is the same as this
+	     one.  */
+
+	  for (p = clobber_list; p; p = p->next)
+	    {
+	      if (p->first_clobber != i + 1
+		  || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
+		continue;
+
+	      for (j = i + 1; j < XVECLEN (insn, 1); j++)
+		{
+		  rtx old_rtx = XEXP (XVECEXP (p->pattern, 1, j), 0);
+		  rtx new_rtx = XEXP (XVECEXP (insn, 1, j), 0);
+
+		  /* OLD and NEW_INSN are the same if both are to be a SCRATCH
+		     of the same mode,
+		     or if both are registers of the same mode and number.  */
+		  if (! (GET_MODE (old_rtx) == GET_MODE (new_rtx)
+			 && ((GET_CODE (old_rtx) == MATCH_SCRATCH
+			      && GET_CODE (new_rtx) == MATCH_SCRATCH)
+			     || (REG_P (old_rtx) && REG_P (new_rtx)
+				 && REGNO (old_rtx) == REGNO (new_rtx)))))
+		    break;
+		}
+
+	      if (j == XVECLEN (insn, 1))
+		break;
+	    }
+
+	  if (p == 0)
+	    {
+	      p = XNEW (struct clobber_pat);
+
+	      p->insns = 0;
+	      p->pattern = insn;
+	      p->first_clobber = i + 1;
+	      p->next = clobber_list;
+	      p->has_hard_reg = has_hard_reg;
+	      clobber_list = p;
+	    }
+
+	  link->next = p->insns;
+	  p->insns = link;
+	}
+    }
+
+  /* Don't mention instructions whose names are the null string
+     or begin with '*'.  They are in the machine description just
+     to be recognized.  */
+  if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
+    return;
+
+  printf ("/* %s:%d */\n", read_rtx_filename, lineno);
+
+  /* Find out how many operands this function has.  */
+  operands = max_operand_vec (insn, 1);
+  if (max_dup_opno >= operands)
+    fatal ("match_dup operand number has no match_operand");
+
+  /* Output the function name and argument declarations.  */
+  printf ("rtx\ngen_%s (", XSTR (insn, 0));
+  if (operands)
+    for (i = 0; i < operands; i++)
+      if (i)
+	printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
+      else
+	printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
+  else
+    printf ("void");
+  printf (")\n");
+  printf ("{\n");
+
+  /* Output code to construct and return the rtl for the instruction body.  */
+
+  if (XVECLEN (insn, 1) == 1)
+    {
+      printf ("  return ");
+      gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
+      printf (";\n}\n\n");
+    }
+  else
+    {
+      char *used = XCNEWVEC (char, operands);
+
+      printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
+	      XVECLEN (insn, 1));
+
+      for (i = 0; i < XVECLEN (insn, 1); i++)
+	{
+	  printf (",\n\t\t");
+	  gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, used);
+	}
+      printf ("));\n}\n\n");
+      XDELETEVEC (used);
+    }
+}
+
+/* Generate the `gen_...' function for a DEFINE_EXPAND.  */
+
+static void
+gen_expand (rtx expand)
+{
+  int operands;
+  int i;
+  char *used;
+
+  if (strlen (XSTR (expand, 0)) == 0)
+    fatal ("define_expand lacks a name");
+  if (XVEC (expand, 1) == 0)
+    fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
+
+  /* Find out how many operands this function has.  */
+  operands = max_operand_vec (expand, 1);
+
+  /* Output the function name and argument declarations.  */
+  printf ("rtx\ngen_%s (", XSTR (expand, 0));
+  if (operands)
+    for (i = 0; i < operands; i++)
+      if (i)
+	printf (",\n\trtx operand%d", i);
+      else
+	printf ("rtx operand%d", i);
+  else
+    printf ("void");
+  printf (")\n");
+  printf ("{\n");
+
+  /* If we don't have any C code to write, only one insn is being written,
+     and no MATCH_DUPs are present, we can just return the desired insn
+     like we do for a DEFINE_INSN.  This saves memory.  */
+  if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
+      && operands > max_dup_opno
+      && XVECLEN (expand, 1) == 1)
+    {
+      printf ("  return ");
+      gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
+      printf (";\n}\n\n");
+      return;
+    }
+
+  /* For each operand referred to only with MATCH_DUPs,
+     make a local variable.  */
+  for (i = operands; i <= max_dup_opno; i++)
+    printf ("  rtx operand%d;\n", i);
+  for (; i <= max_scratch_opno; i++)
+    printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
+  printf ("  rtx _val = 0;\n");
+  printf ("  start_sequence ();\n");
+
+  /* The fourth operand of DEFINE_EXPAND is some code to be executed
+     before the actual construction.
+     This code expects to refer to `operands'
+     just as the output-code in a DEFINE_INSN does,
+     but here `operands' is an automatic array.
+     So copy the operand values there before executing it.  */
+  if (XSTR (expand, 3) && *XSTR (expand, 3))
+    {
+      printf ("  {\n");
+      if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
+	printf ("    rtx operands[%d];\n",
+	    MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
+      /* Output code to copy the arguments into `operands'.  */
+      for (i = 0; i < operands; i++)
+	printf ("    operands[%d] = operand%d;\n", i, i);
+
+      /* Output the special code to be executed before the sequence
+	 is generated.  */
+      print_rtx_ptr_loc (XSTR (expand, 3));
+      printf ("%s\n", XSTR (expand, 3));
+
+      /* Output code to copy the arguments back out of `operands'
+	 (unless we aren't going to use them at all).  */
+      if (XVEC (expand, 1) != 0)
+	{
+	  for (i = 0; i < operands; i++)
+	    printf ("    operand%d = operands[%d];\n", i, i);
+	  for (; i <= max_dup_opno; i++)
+	    printf ("    operand%d = operands[%d];\n", i, i);
+	  for (; i <= max_scratch_opno; i++)
+	    printf ("    operand%d = operands[%d];\n", i, i);
+	}
+      printf ("  }\n");
+    }
+
+  /* Output code to construct the rtl for the instruction bodies.
+     Use emit_insn to add them to the sequence being accumulated.
+     But don't do this if the user's code has set `no_more' nonzero.  */
+
+  used = XCNEWVEC (char,
+		   MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
+
+  for (i = 0; i < XVECLEN (expand, 1); i++)
+    {
+      rtx next = XVECEXP (expand, 1, i);
+      if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
+	  || (GET_CODE (next) == PARALLEL
+	      && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
+		   && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
+		  || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))
+	  || GET_CODE (next) == RETURN)
+	printf ("  emit_jump_insn (");
+      else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
+	       || GET_CODE (next) == CALL
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == SET
+		   && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
+	printf ("  emit_call_insn (");
+      else if (LABEL_P (next))
+	printf ("  emit_label (");
+      else if (GET_CODE (next) == MATCH_OPERAND
+	       || GET_CODE (next) == MATCH_DUP
+	       || GET_CODE (next) == MATCH_OPERATOR
+	       || GET_CODE (next) == MATCH_OP_DUP
+	       || GET_CODE (next) == MATCH_PARALLEL
+	       || GET_CODE (next) == MATCH_PAR_DUP
+	       || GET_CODE (next) == PARALLEL)
+	printf ("  emit (");
+      else
+	printf ("  emit_insn (");
+      gen_exp (next, DEFINE_EXPAND, used);
+      printf (");\n");
+      if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
+	  && GET_CODE (SET_SRC (next)) == LABEL_REF)
+	printf ("  emit_barrier ();");
+    }
+
+  XDELETEVEC (used);
+
+  /* Call `get_insns' to extract the list of all the
+     insns emitted within this gen_... function.  */
+
+  printf ("  _val = get_insns ();\n");
+  printf ("  end_sequence ();\n");
+  printf ("  return _val;\n}\n\n");
+}
+
+/* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
+
+static void
+gen_split (rtx split)
+{
+  int i;
+  int operands;
+  const char *const name =
+    ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
+  const char *unused;
+  char *used;
+
+  if (XVEC (split, 0) == 0)
+    fatal ("define_%s (definition %d) lacks a pattern", name,
+	   insn_index_number);
+  else if (XVEC (split, 2) == 0)
+    fatal ("define_%s (definition %d) lacks a replacement pattern", name,
+	   insn_index_number);
+
+  /* Find out how many operands this function has.  */
+
+  max_operand_vec (split, 2);
+  operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
+  unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
+  used = XCNEWVEC (char, operands);
+
+  /* Output the prototype, function name and argument declarations.  */
+  if (GET_CODE (split) == DEFINE_PEEPHOLE2)
+    {
+      printf ("extern rtx gen_%s_%d (rtx, rtx *);\n",
+	      name, insn_code_number);
+      printf ("rtx\ngen_%s_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
+	      name, insn_code_number, unused);
+    }
+  else
+    {
+      printf ("extern rtx gen_split_%d (rtx, rtx *);\n", insn_code_number);
+      printf ("rtx\ngen_split_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
+	      insn_code_number, unused);
+    }
+  printf ("{\n");
+
+  /* Declare all local variables.  */
+  for (i = 0; i < operands; i++)
+    printf ("  rtx operand%d;\n", i);
+  printf ("  rtx _val = 0;\n");
+
+  if (GET_CODE (split) == DEFINE_PEEPHOLE2)
+    output_peephole2_scratches (split);
+
+  printf ("  start_sequence ();\n");
+
+  /* The fourth operand of DEFINE_SPLIT is some code to be executed
+     before the actual construction.  */
+
+  if (XSTR (split, 3))
+    {
+      print_rtx_ptr_loc (XSTR (split, 3));
+      printf ("%s\n", XSTR (split, 3));
+    }
+
+  /* Output code to copy the arguments back out of `operands'  */
+  for (i = 0; i < operands; i++)
+    printf ("  operand%d = operands[%d];\n", i, i);
+
+  /* Output code to construct the rtl for the instruction bodies.
+     Use emit_insn to add them to the sequence being accumulated.
+     But don't do this if the user's code has set `no_more' nonzero.  */
+
+  for (i = 0; i < XVECLEN (split, 2); i++)
+    {
+      rtx next = XVECEXP (split, 2, i);
+      if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
+	  || (GET_CODE (next) == PARALLEL
+	      && GET_CODE (XVECEXP (next, 0, 0)) == SET
+	      && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
+	  || GET_CODE (next) == RETURN)
+	printf ("  emit_jump_insn (");
+      else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
+	       || GET_CODE (next) == CALL
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == SET
+		   && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
+	printf ("  emit_call_insn (");
+      else if (LABEL_P (next))
+	printf ("  emit_label (");
+      else if (GET_CODE (next) == MATCH_OPERAND
+	       || GET_CODE (next) == MATCH_OPERATOR
+	       || GET_CODE (next) == MATCH_PARALLEL
+	       || GET_CODE (next) == MATCH_OP_DUP
+	       || GET_CODE (next) == MATCH_DUP
+	       || GET_CODE (next) == PARALLEL)
+	printf ("  emit (");
+      else
+	printf ("  emit_insn (");
+      gen_exp (next, GET_CODE (split), used);
+      printf (");\n");
+      if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
+	  && GET_CODE (SET_SRC (next)) == LABEL_REF)
+	printf ("  emit_barrier ();");
+    }
+
+  /* Call `get_insns' to make a list of all the
+     insns emitted within this gen_... function.  */
+
+  printf ("  _val = get_insns ();\n");
+  printf ("  end_sequence ();\n");
+  printf ("  return _val;\n}\n\n");
+
+  free (used);
+}
+
+/* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
+   size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
+   the end of the vector.  */
+
+static void
+output_add_clobbers (void)
+{
+  struct clobber_pat *clobber;
+  struct clobber_ent *ent;
+  int i;
+
+  printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
+  printf ("{\n");
+  printf ("  switch (insn_code_number)\n");
+  printf ("    {\n");
+
+  for (clobber = clobber_list; clobber; clobber = clobber->next)
+    {
+      for (ent = clobber->insns; ent; ent = ent->next)
+	printf ("    case %d:\n", ent->code_number);
+
+      for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
+	{
+	  printf ("      XVECEXP (pattern, 0, %d) = ", i);
+	  gen_exp (XVECEXP (clobber->pattern, 1, i),
+		   GET_CODE (clobber->pattern), NULL);
+	  printf (";\n");
+	}
+
+      printf ("      break;\n\n");
+    }
+
+  printf ("    default:\n");
+  printf ("      gcc_unreachable ();\n");
+  printf ("    }\n");
+  printf ("}\n");
+}
+
+/* Write a function, `added_clobbers_hard_reg_p' that is given an insn_code
+   number that will have clobbers added (as indicated by `recog') and returns
+   1 if those include a clobber of a hard reg or 0 if all of them just clobber
+   SCRATCH.  */
+
+static void
+output_added_clobbers_hard_reg_p (void)
+{
+  struct clobber_pat *clobber;
+  struct clobber_ent *ent;
+  int clobber_p, used;
+
+  printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
+  printf ("{\n");
+  printf ("  switch (insn_code_number)\n");
+  printf ("    {\n");
+
+  for (clobber_p = 0; clobber_p <= 1; clobber_p++)
+    {
+      used = 0;
+      for (clobber = clobber_list; clobber; clobber = clobber->next)
+	if (clobber->has_hard_reg == clobber_p)
+	  for (ent = clobber->insns; ent; ent = ent->next)
+	    {
+	      printf ("    case %d:\n", ent->code_number);
+	      used++;
+	    }
+
+      if (used)
+	printf ("      return %d;\n\n", clobber_p);
+    }
+
+  printf ("    default:\n");
+  printf ("      gcc_unreachable ();\n");
+  printf ("    }\n");
+  printf ("}\n");
+}
+
+/* Generate code to invoke find_free_register () as needed for the
+   scratch registers used by the peephole2 pattern in SPLIT.  */
+
+static void
+output_peephole2_scratches (rtx split)
+{
+  int i;
+  int insn_nr = 0;
+
+  printf ("  HARD_REG_SET _regs_allocated;\n");
+  printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
+
+  for (i = 0; i < XVECLEN (split, 0); i++)
+    {
+      rtx elt = XVECEXP (split, 0, i);
+      if (GET_CODE (elt) == MATCH_SCRATCH)
+	{
+	  int last_insn_nr = insn_nr;
+	  int cur_insn_nr = insn_nr;
+	  int j;
+	  for (j = i + 1; j < XVECLEN (split, 0); j++)
+	    if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
+	      {
+		if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
+		  last_insn_nr = cur_insn_nr;
+	      }
+	    else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
+	      cur_insn_nr++;
+
+	  printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
+    return NULL;\n",
+		  XINT (elt, 0),
+		  insn_nr, last_insn_nr,
+		  XSTR (elt, 1),
+		  GET_MODE_NAME (GET_MODE (elt)));
+
+	}
+      else if (GET_CODE (elt) != MATCH_DUP)
+	insn_nr++;
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+  rtx desc;
+
+  progname = "genemit";
+
+  if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
+    return (FATAL_EXIT_CODE);
+
+  /* Assign sequential codes to all entries in the machine description
+     in parallel with the tables in insn-output.c.  */
+
+  insn_code_number = 0;
+  insn_index_number = 0;
+
+  printf ("/* Generated automatically by the program `genemit'\n\
+from the machine description file `md'.  */\n\n");
+
+  printf ("#include \"config.h\"\n");
+  printf ("#include \"system.h\"\n");
+  printf ("#include \"coretypes.h\"\n");
+  printf ("#include \"tm.h\"\n");
+  printf ("#include \"rtl.h\"\n");
+  printf ("#include \"tm_p.h\"\n");
+  printf ("#include \"function.h\"\n");
+  printf ("#include \"expr.h\"\n");
+  printf ("#include \"optabs.h\"\n");
+  printf ("#include \"real.h\"\n");
+  printf ("#include \"dfp.h\"\n");
+  printf ("#include \"flags.h\"\n");
+  printf ("#include \"output.h\"\n");
+  printf ("#include \"insn-config.h\"\n");
+  printf ("#include \"hard-reg-set.h\"\n");
+  printf ("#include \"recog.h\"\n");
+  printf ("#include \"resource.h\"\n");
+  printf ("#include \"reload.h\"\n");
+  printf ("#include \"toplev.h\"\n");
+  printf ("#include \"regs.h\"\n");
+  printf ("#include \"tm-constrs.h\"\n");
+  printf ("#include \"ggc.h\"\n");
+  printf ("#include \"basic-block.h\"\n");
+  printf ("#include \"integrate.h\"\n\n");
+  printf ("#define FAIL return (end_sequence (), _val)\n");
+  printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
+
+  /* Read the machine description.  */
+
+  while (1)
+    {
+      int line_no;
+
+      desc = read_md_rtx (&line_no, &insn_code_number);
+      if (desc == NULL)
+	break;
+
+      switch (GET_CODE (desc))
+	{
+	case DEFINE_INSN:
+	  gen_insn (desc, line_no);
+	  break;
+
+	case DEFINE_EXPAND:
+	  printf ("/* %s:%d */\n", read_rtx_filename, line_no);
+	  gen_expand (desc);
+	  break;
+
+	case DEFINE_SPLIT:
+	  printf ("/* %s:%d */\n", read_rtx_filename, line_no);
+	  gen_split (desc);
+	  break;
+
+	case DEFINE_PEEPHOLE2:
+	  printf ("/* %s:%d */\n", read_rtx_filename, line_no);
+	  gen_split (desc);
+	  break;
+
+	default:
+	  break;
+	}
+      ++insn_index_number;
+    }
+
+  /* Write out the routines to add CLOBBERs to a pattern and say whether they
+     clobber a hard reg.  */
+  output_add_clobbers ();
+  output_added_clobbers_hard_reg_p ();
+
+  fflush (stdout);
+  return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
+}