2010-08-27 Jerry DeLisle <jvdelisle@gcc.gnu.org>

[pf3gnuchains/gcc-fork.git] / gcc / rtl.c

diff --git a/gcc/rtl.c b/gcc/rtl.c
index deaf22c..79dafcb 100644 (file)
--- a/gcc/rtl.c
+++ b/gcc/rtl.c
@@ -1,12 +1,12 @@
 /* RTL utility routines.
 /* RTL utility routines.

-   Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001
-   Free Software Foundation, Inc.
+   Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002,
+   2003, 2004, 2005, 2006, 2007, 2008, 2009 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
 
 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
+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
 version.
 
 GCC is distributed in the hope that it will be useful, but WITHOUT ANY


@@ -15,88 +15,35 @@ 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
 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.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */

 
 

+/* This file is compiled twice: once for the generator programs
+   once for the compiler.  */
+#ifdef GENERATOR_FILE
+#include "bconfig.h"
+#else

 #include "config.h"
 #include "config.h"

+#endif
+

 #include "system.h"
 #include "system.h"

+#include "coretypes.h"
+#include "tm.h"

 #include "rtl.h"
 #include "rtl.h"

-#include "real.h"

 #include "ggc.h"
 #include "ggc.h"

-#include "errors.h"
-
-\f
-/* Calculate the format for CONST_DOUBLE.  This depends on the relative
-   widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
-
-   We need to go out to e0wwwww, since REAL_ARITHMETIC assumes 16-bits
-   per element in REAL_VALUE_TYPE.
-
-   This is duplicated in gengenrtl.c.
-
-   A number of places assume that there are always at least two 'w'
-   slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
-
-#ifdef REAL_ARITHMETIC
-# if MAX_LONG_DOUBLE_TYPE_SIZE == 96
-#  define REAL_WIDTH   \
-     (11*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
-# else
-#  if MAX_LONG_DOUBLE_TYPE_SIZE == 128
-#   define REAL_WIDTH  \
-      (19*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
-#  else
-#   if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
-#    define REAL_WIDTH \
-       (7*8 + HOST_BITS_PER_WIDE_INT)/HOST_BITS_PER_WIDE_INT
-#   endif
-#  endif
-# endif
-#endif /* REAL_ARITHMETIC */
-
-#ifndef REAL_WIDTH
-# if HOST_BITS_PER_WIDE_INT*2 >= MAX_LONG_DOUBLE_TYPE_SIZE
-#  define REAL_WIDTH   2
-# else
-#  if HOST_BITS_PER_WIDE_INT*3 >= MAX_LONG_DOUBLE_TYPE_SIZE
-#   define REAL_WIDTH  3
-#  else
-#   if HOST_BITS_PER_WIDE_INT*4 >= MAX_LONG_DOUBLE_TYPE_SIZE
-#    define REAL_WIDTH 4
-#   endif
-#  endif
-# endif
-#endif /* REAL_WIDTH */
-
-#if REAL_WIDTH == 1
-# define CONST_DOUBLE_FORMAT   "e0ww"
+#ifdef GENERATOR_FILE
+# include "errors.h"

 #else
 #else

-# if REAL_WIDTH == 2
-#  define CONST_DOUBLE_FORMAT  "e0ww"
-# else
-#  if REAL_WIDTH == 3
-#   define CONST_DOUBLE_FORMAT "e0www"
-#  else
-#   if REAL_WIDTH == 4
-#    define CONST_DOUBLE_FORMAT        "e0wwww"
-#   else
-#    if REAL_WIDTH == 5
-#     define CONST_DOUBLE_FORMAT       "e0wwwww"
-#    else
-#     define CONST_DOUBLE_FORMAT       /* nothing - will cause syntax error */
-#    endif
-#   endif
-#  endif
-# endif
+# include "diagnostic-core.h"

 #endif
 
 #endif
 

+\f

 /* Indexed by rtx code, gives number of operands for an rtx with that code.
    Does NOT include rtx header data (code and links).  */
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   sizeof FORMAT - 1 ,
 
 /* Indexed by rtx code, gives number of operands for an rtx with that code.
    Does NOT include rtx header data (code and links).  */
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   sizeof FORMAT - 1 ,
 

-const int rtx_length[NUM_RTX_CODE + 1] = {
+const unsigned char rtx_length[NUM_RTX_CODE] = {

 #include "rtl.def"
 };
 
 #include "rtl.def"
 };
 


@@ -106,115 +53,17 @@ const int rtx_length[NUM_RTX_CODE + 1] = {
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   NAME ,
 
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   NAME ,
 

-const char * const rtx_name[] = {
+const char * const rtx_name[NUM_RTX_CODE] = {

 #include "rtl.def"             /* rtl expressions are documented here */
 };
 
 #undef DEF_RTL_EXPR
 
 #include "rtl.def"             /* rtl expressions are documented here */
 };
 
 #undef DEF_RTL_EXPR
 

-/* Indexed by machine mode, gives the name of that machine mode.
-   This name does not include the letters "mode".  */
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  NAME,
-
-const char * const mode_name[] = {
-#include "machmode.def"
-};
-
-#undef DEF_MACHMODE
-
-/* Indexed by machine mode, gives the class mode for GET_MODE_CLASS.  */
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  CLASS,
-
-const enum mode_class mode_class[] = {
-#include "machmode.def"
-};
-
-#undef DEF_MACHMODE
-
-/* Indexed by machine mode, gives the length of the mode, in bits.
-   GET_MODE_BITSIZE uses this.  */
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  BITSIZE,
-
-const unsigned int mode_bitsize[] = {
-#include "machmode.def"
-};
-
-#undef DEF_MACHMODE
-
-/* Indexed by machine mode, gives the length of the mode, in bytes.
-   GET_MODE_SIZE uses this.  */
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  SIZE,
-
-const unsigned int mode_size[] = {
-#include "machmode.def"
-};
-
-#undef DEF_MACHMODE
-
-/* Indexed by machine mode, gives the length of the mode's subunit.
-   GET_MODE_UNIT_SIZE uses this.  */
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  UNIT,
-
-const unsigned int mode_unit_size[] = {
-#include "machmode.def"                /* machine modes are documented here */
-};
-
-#undef DEF_MACHMODE
-
-/* Indexed by machine mode, gives next wider natural mode
-   (QI -> HI -> SI -> DI, etc.)  Widening multiply instructions
-   use this.  */
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  \
-  (unsigned char) WIDER,
-
-const unsigned char mode_wider_mode[] = {
-#include "machmode.def"                /* machine modes are documented here */
-};
-
-#undef DEF_MACHMODE
-
-#define DEF_MACHMODE(SYM, NAME, CLASS, BITSIZE, SIZE, UNIT, WIDER)  \
-  ((BITSIZE) >= HOST_BITS_PER_WIDE_INT) ? ~(unsigned HOST_WIDE_INT)0 : ((unsigned HOST_WIDE_INT) 1 << (BITSIZE)) - 1,
-
-/* Indexed by machine mode, gives mask of significant bits in mode.  */
-
-const unsigned HOST_WIDE_INT mode_mask_array[] = {
-#include "machmode.def"
-};
-
-/* Indexed by mode class, gives the narrowest mode for each class.
-   The Q modes are always of width 1 (2 for complex) - it is impossible
-   for any mode to be narrower.
-
-   Note that we use QImode instead of BImode for MODE_INT, since
-   otherwise the middle end will try to use it for bitfields in
-   structures and the like, which we do not want.  Only the target
-   md file should generate BImode widgets.  */
-
-const enum machine_mode class_narrowest_mode[(int) MAX_MODE_CLASS] = {
-    /* MODE_RANDOM */          VOIDmode,
-    /* MODE_INT */             QImode,
-    /* MODE_FLOAT */           QFmode,
-    /* MODE_PARTIAL_INT */     PQImode,
-    /* MODE_CC */              CCmode,
-    /* MODE_COMPLEX_INT */     CQImode,
-    /* MODE_COMPLEX_FLOAT */   QCmode,
-    /* MODE_VECTOR_INT */      V2QImode,
-    /* MODE_VECTOR_FLOAT */    V2SFmode
-};
-
-

 /* Indexed by rtx code, gives a sequence of operand-types for
    rtx's of that code.  The sequence is a C string in which
    each character describes one operand.  */
 
 /* Indexed by rtx code, gives a sequence of operand-types for
    rtx's of that code.  The sequence is a C string in which
    each character describes one operand.  */
 

-const char * const rtx_format[] = {
+const char * const rtx_format[NUM_RTX_CODE] = {

   /* "*" undefined.
          can cause a warning message
      "0" field is unused (or used in a phase-dependent manner)
   /* "*" undefined.
          can cause a warning message
      "0" field is unused (or used in a phase-dependent manner)


@@ -239,6 +88,7 @@ const char * const rtx_format[] = {
      "u" a pointer to another insn
          prints the uid of the insn.
      "b" is a pointer to a bitmap header.
      "u" a pointer to another insn
          prints the uid of the insn.
      "b" is a pointer to a bitmap header.

+     "B" is a basic block pointer.

      "t" is a tree pointer.  */
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   FORMAT ,
      "t" is a tree pointer.  */
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   FORMAT ,


@@ -249,89 +99,140 @@ const char * const rtx_format[] = {
 /* Indexed by rtx code, gives a character representing the "class" of
    that rtx code.  See rtl.def for documentation on the defined classes.  */
 
 /* Indexed by rtx code, gives a character representing the "class" of
    that rtx code.  See rtl.def for documentation on the defined classes.  */
 

-const char rtx_class[] = {
+const enum rtx_class rtx_class[NUM_RTX_CODE] = {

 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   CLASS,
 #include "rtl.def"             /* rtl expressions are defined here */
 #undef DEF_RTL_EXPR
 };
 
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)   CLASS,
 #include "rtl.def"             /* rtl expressions are defined here */
 #undef DEF_RTL_EXPR
 };
 

+/* Indexed by rtx code, gives the size of the rtx in bytes.  */
+
+const unsigned char rtx_code_size[NUM_RTX_CODE] = {
+#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS)                                \
+  ((ENUM) == CONST_INT || (ENUM) == CONST_DOUBLE || (ENUM) == CONST_FIXED\
+   ? RTX_HDR_SIZE + (sizeof FORMAT - 1) * sizeof (HOST_WIDE_INT)       \
+   : RTX_HDR_SIZE + (sizeof FORMAT - 1) * sizeof (rtunion)),
+
+#include "rtl.def"
+#undef DEF_RTL_EXPR
+};
+

 /* Names for kinds of NOTEs and REG_NOTEs.  */
 
 /* Names for kinds of NOTEs and REG_NOTEs.  */
 

-const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS] =
+const char * const note_insn_name[NOTE_INSN_MAX] =

 {
 {

-  "", "NOTE_INSN_DELETED",
-  "NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
-  "NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
-  "NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
-  "NOTE_INSN_FUNCTION_END",
-  "NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
-  "NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG",
-  "NOTE_INSN_EH_REGION_BEG", "NOTE_INSN_EH_REGION_END",
-  "NOTE_INSN_REPEATED_LINE_NUMBER", "NOTE_INSN_RANGE_BEG",
-  "NOTE_INSN_RANGE_END", "NOTE_INSN_LIVE",
-  "NOTE_INSN_BASIC_BLOCK", "NOTE_INSN_EXPECTED_VALUE"
+#define DEF_INSN_NOTE(NAME) #NAME,
+#include "insn-notes.def"
+#undef DEF_INSN_NOTE

 };
 
 };
 

-const char * const reg_note_name[] =
+const char * const reg_note_name[REG_NOTE_MAX] =

 {
 {

-  "", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_EQUAL",
-  "REG_WAS_0", "REG_RETVAL", "REG_LIBCALL", "REG_NONNEG",
-  "REG_NO_CONFLICT", "REG_UNUSED", "REG_CC_SETTER", "REG_CC_USER",
-  "REG_LABEL", "REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
-  "REG_EXEC_COUNT", "REG_NOALIAS", "REG_SAVE_AREA", "REG_BR_PRED",
-  "REG_FRAME_RELATED_EXPR", "REG_EH_CONTEXT", "REG_EH_REGION",
-  "REG_SAVE_NOTE", "REG_MAYBE_DEAD", "REG_NORETURN",
-  "REG_NON_LOCAL_GOTO", "REG_SETJMP", "REG_ALWAYS_RETURN",
-  "REG_VTABLE_REF"
+#define DEF_REG_NOTE(NAME) #NAME,
+#include "reg-notes.def"
+#undef DEF_REG_NOTE

 };
 
 };
 

+#ifdef GATHER_STATISTICS
+static int rtx_alloc_counts[(int) LAST_AND_UNUSED_RTX_CODE];
+static int rtx_alloc_sizes[(int) LAST_AND_UNUSED_RTX_CODE];
+static int rtvec_alloc_counts;
+static int rtvec_alloc_sizes;
+#endif
+

 \f
 /* Allocate an rtx vector of N elements.
    Store the length, and initialize all elements to zero.  */
 
 rtvec
 \f
 /* Allocate an rtx vector of N elements.
    Store the length, and initialize all elements to zero.  */
 
 rtvec

-rtvec_alloc (n)
-     int n;
+rtvec_alloc (int n)

 {
   rtvec rt;
 
 {
   rtvec rt;
 

-  rt = ggc_alloc_rtvec (n);
-  /* clear out the vector */
+  rt = ggc_alloc_rtvec_sized (n);
+  /* Clear out the vector.  */

   memset (&rt->elem[0], 0, n * sizeof (rtx));
 
   PUT_NUM_ELEM (rt, n);
   memset (&rt->elem[0], 0, n * sizeof (rtx));
 
   PUT_NUM_ELEM (rt, n);

+
+#ifdef GATHER_STATISTICS
+  rtvec_alloc_counts++;
+  rtvec_alloc_sizes += n * sizeof (rtx);
+#endif
+

   return rt;
 }
 
   return rt;
 }
 

+/* Create a bitwise copy of VEC.  */
+
+rtvec
+shallow_copy_rtvec (rtvec vec)
+{
+  rtvec newvec;
+  int n;
+
+  n = GET_NUM_ELEM (vec);
+  newvec = rtvec_alloc (n);
+  memcpy (&newvec->elem[0], &vec->elem[0], sizeof (rtx) * n);
+  return newvec;
+}
+
+/* Return the number of bytes occupied by rtx value X.  */
+
+unsigned int
+rtx_size (const_rtx x)
+{
+  if (GET_CODE (x) == SYMBOL_REF && SYMBOL_REF_HAS_BLOCK_INFO_P (x))
+    return RTX_HDR_SIZE + sizeof (struct block_symbol);
+  return RTX_CODE_SIZE (GET_CODE (x));
+}
+

 /* Allocate an rtx of code CODE.  The CODE is stored in the rtx;
    all the rest is initialized to zero.  */
 
 rtx
 /* Allocate an rtx of code CODE.  The CODE is stored in the rtx;
    all the rest is initialized to zero.  */
 
 rtx

-rtx_alloc (code)
-  RTX_CODE code;
+rtx_alloc_stat (RTX_CODE code MEM_STAT_DECL)

 {
 {

-  rtx rt;
-  int n = GET_RTX_LENGTH (code);
-
-  rt = ggc_alloc_rtx (n);
+  rtx rt = ggc_alloc_zone_rtx_def_stat (&rtl_zone, RTX_CODE_SIZE (code)
+                                        PASS_MEM_STAT);

 
   /* We want to clear everything up to the FLD array.  Normally, this
      is one int, but we don't want to assume that and it isn't very
      portable anyway; this is.  */
 
 
   /* We want to clear everything up to the FLD array.  Normally, this
      is one int, but we don't want to assume that and it isn't very
      portable anyway; this is.  */
 

-  memset (rt, 0, sizeof (struct rtx_def) - sizeof (rtunion));
+  memset (rt, 0, RTX_HDR_SIZE);

   PUT_CODE (rt, code);
   PUT_CODE (rt, code);

+
+#ifdef GATHER_STATISTICS
+  rtx_alloc_counts[code]++;
+  rtx_alloc_sizes[code] += RTX_CODE_SIZE (code);
+#endif
+

   return rt;
 }
 
 \f
   return rt;
 }
 
 \f

+/* Return true if ORIG is a sharable CONST.  */
+
+bool
+shared_const_p (const_rtx orig)
+{
+  gcc_assert (GET_CODE (orig) == CONST);
+
+  /* CONST can be shared if it contains a SYMBOL_REF.  If it contains
+     a LABEL_REF, it isn't sharable.  */
+  return (GET_CODE (XEXP (orig, 0)) == PLUS
+         && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
+         && CONST_INT_P(XEXP (XEXP (orig, 0), 1)));
+}
+
+

 /* Create a new copy of an rtx.
    Recursively copies the operands of the rtx,
    except for those few rtx codes that are sharable.  */
 
 rtx
 /* Create a new copy of an rtx.
    Recursively copies the operands of the rtx,
    except for those few rtx codes that are sharable.  */
 
 rtx

-copy_rtx (orig)
-     rtx orig;
+copy_rtx (rtx orig)

 {
   rtx copy;
   int i, j;
 {
   rtx copy;
   int i, j;


@@ -343,24 +244,26 @@ copy_rtx (orig)
   switch (code)
     {
     case REG:
   switch (code)
     {
     case REG:

-    case QUEUED:
+    case DEBUG_EXPR:
+    case VALUE:

     case CONST_INT:
     case CONST_DOUBLE:
     case CONST_INT:
     case CONST_DOUBLE:

+    case CONST_FIXED:
+    case CONST_VECTOR:

     case SYMBOL_REF:
     case CODE_LABEL:
     case PC:
     case CC0:
     case SCRATCH:
       /* SCRATCH must be shared because they represent distinct values.  */
     case SYMBOL_REF:
     case CODE_LABEL:
     case PC:
     case CC0:
     case SCRATCH:
       /* SCRATCH must be shared because they represent distinct values.  */

-    case ADDRESSOF:

       return orig;
       return orig;

+    case CLOBBER:
+      if (REG_P (XEXP (orig, 0)) && REGNO (XEXP (orig, 0)) < FIRST_PSEUDO_REGISTER)
+       return orig;
+      break;

 
     case CONST:
 
     case CONST:

-      /* CONST can be shared if it contains a SYMBOL_REF.  If it contains
-        a LABEL_REF, it isn't sharable.  */
-      if (GET_CODE (XEXP (orig, 0)) == PLUS
-         && GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
-         && GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
+      if (shared_const_p (orig))

        return orig;
       break;
 
        return orig;
       break;
 


@@ -373,215 +276,211 @@ copy_rtx (orig)
       break;
     }
 
       break;
     }
 

-  copy = rtx_alloc (code);
-
-  /* Copy the various flags, and other information.  We assume that
-     all fields need copying, and then clear the fields that should
+  /* Copy the various flags, fields, and other information.  We assume
+     that all fields need copying, and then clear the fields that should

      not be copied.  That is the sensible default behavior, and forces
      us to explicitly document why we are *not* copying a flag.  */
      not be copied.  That is the sensible default behavior, and forces
      us to explicitly document why we are *not* copying a flag.  */

-  memcpy (copy, orig, sizeof (struct rtx_def) - sizeof (rtunion));
+  copy = shallow_copy_rtx (orig);

 
   /* We do not copy the USED flag, which is used as a mark bit during
      walks over the RTL.  */
 
   /* We do not copy the USED flag, which is used as a mark bit during
      walks over the RTL.  */

-  copy->used = 0;
+  RTX_FLAG (copy, used) = 0;

 
   /* We do not copy FRAME_RELATED for INSNs.  */
 
   /* We do not copy FRAME_RELATED for INSNs.  */

-  if (GET_RTX_CLASS (code) == 'i')
-    copy->frame_related = 0;
-  copy->jump = orig->jump;
-  copy->call = orig->call;
+  if (INSN_P (orig))
+    RTX_FLAG (copy, frame_related) = 0;
+  RTX_FLAG (copy, jump) = RTX_FLAG (orig, jump);
+  RTX_FLAG (copy, call) = RTX_FLAG (orig, call);

 
   format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
 
   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
 
   format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
 
   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)

-    {
-      copy->fld[i] = orig->fld[i];
-      switch (*format_ptr++)
-       {
-       case 'e':
-         if (XEXP (orig, i) != NULL)
-           XEXP (copy, i) = copy_rtx (XEXP (orig, i));
-         break;
-
-       case 'E':
-       case 'V':
-         if (XVEC (orig, i) != NULL)
-           {
-             XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
-             for (j = 0; j < XVECLEN (copy, i); j++)
-               XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
-           }
-         break;
-
-       case 't':
-       case 'w':
-       case 'i':
-       case 's':
-       case 'S':
-       case 'T':
-       case 'u':
-       case '0':
-         /* These are left unchanged.  */
-         break;
-
-       default:
-         abort ();
-       }
-    }
+    switch (*format_ptr++)
+      {
+      case 'e':
+       if (XEXP (orig, i) != NULL)
+         XEXP (copy, i) = copy_rtx (XEXP (orig, i));
+       break;
+
+      case 'E':
+      case 'V':
+       if (XVEC (orig, i) != NULL)
+         {
+           XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
+           for (j = 0; j < XVECLEN (copy, i); j++)
+             XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
+         }
+       break;
+
+      case 't':
+      case 'w':
+      case 'i':
+      case 's':
+      case 'S':
+      case 'T':
+      case 'u':
+      case 'B':
+      case '0':
+       /* These are left unchanged.  */
+       break;
+
+      default:
+       gcc_unreachable ();
+      }

   return copy;
 }
 
   return copy;
 }
 

-/* Similar to `copy_rtx' except that if MAY_SHARE is present, it is
-   placed in the result directly, rather than being copied.  */
+/* Create a new copy of an rtx.  Only copy just one level.  */

 
 rtx
 
 rtx

-copy_most_rtx (orig, may_share)
-     rtx orig;
-     rtx may_share;
+shallow_copy_rtx_stat (const_rtx orig MEM_STAT_DECL)

 {
 {

-  rtx copy;
-  int i, j;
-  RTX_CODE code;
-  const char *format_ptr;
+  const unsigned int size = rtx_size (orig);
+  rtx const copy = ggc_alloc_zone_rtx_def_stat (&rtl_zone, size PASS_MEM_STAT);
+  return (rtx) memcpy (copy, orig, size);
+}
+\f
+/* Nonzero when we are generating CONCATs.  */
+int generating_concat_p;

 
 

-  if (orig == may_share)
-    return orig;
+/* Nonzero when we are expanding trees to RTL.  */
+int currently_expanding_to_rtl;

 
 

-  code = GET_CODE (orig);
+\f

 
 

+/* Same as rtx_equal_p, but call CB on each pair of rtx if CB is not NULL.
+   When the callback returns true, we continue with the new pair.
+   Whenever changing this function check if rtx_equal_p below doesn't need
+   changing as well.  */
+
+int
+rtx_equal_p_cb (const_rtx x, const_rtx y, rtx_equal_p_callback_function cb)
+{
+  int i;
+  int j;
+  enum rtx_code code;
+  const char *fmt;
+  rtx nx, ny;
+
+  if (x == y)
+    return 1;
+  if (x == 0 || y == 0)
+    return 0;
+
+  /* Invoke the callback first.  */
+  if (cb != NULL
+      && ((*cb) (&x, &y, &nx, &ny)))
+    return rtx_equal_p_cb (nx, ny, cb);
+
+  code = GET_CODE (x);
+  /* Rtx's of different codes cannot be equal.  */
+  if (code != GET_CODE (y))
+    return 0;
+
+  /* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent.
+     (REG:SI x) and (REG:HI x) are NOT equivalent.  */
+
+  if (GET_MODE (x) != GET_MODE (y))
+    return 0;
+
+  /* MEMs refering to different address space are not equivalent.  */
+  if (code == MEM && MEM_ADDR_SPACE (x) != MEM_ADDR_SPACE (y))
+    return 0;
+
+  /* Some RTL can be compared nonrecursively.  */

   switch (code)
     {
     case REG:
   switch (code)
     {
     case REG:

-    case QUEUED:
-    case CONST_INT:
-    case CONST_DOUBLE:
+      return (REGNO (x) == REGNO (y));
+
+    case LABEL_REF:
+      return XEXP (x, 0) == XEXP (y, 0);
+

     case SYMBOL_REF:
     case SYMBOL_REF:

-    case CODE_LABEL:
-    case PC:
-    case CC0:
-      return orig;
+      return XSTR (x, 0) == XSTR (y, 0);
+
+    case DEBUG_EXPR:
+    case VALUE:
+    case SCRATCH:
+    case CONST_DOUBLE:
+    case CONST_INT:
+    case CONST_FIXED:
+      return 0;
+

     default:
       break;
     }
 
     default:
       break;
     }
 

-  copy = rtx_alloc (code);
-  PUT_MODE (copy, GET_MODE (orig));
-  copy->in_struct = orig->in_struct;
-  copy->volatil = orig->volatil;
-  copy->unchanging = orig->unchanging;
-  copy->integrated = orig->integrated;
-  copy->frame_related = orig->frame_related;
-
-  format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
+  /* Compare the elements.  If any pair of corresponding elements
+     fail to match, return 0 for the whole thing.  */

 
 

-  for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
+  fmt = GET_RTX_FORMAT (code);
+  for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)

     {
     {

-      switch (*format_ptr++)
+      switch (fmt[i])

        {
        {

-       case 'e':
-         XEXP (copy, i) = XEXP (orig, i);
-         if (XEXP (orig, i) != NULL && XEXP (orig, i) != may_share)
-           XEXP (copy, i) = copy_most_rtx (XEXP (orig, i), may_share);
+       case 'w':
+         if (XWINT (x, i) != XWINT (y, i))
+           return 0;

          break;
 
          break;
 

-       case 'u':
-         XEXP (copy, i) = XEXP (orig, i);
+       case 'n':
+       case 'i':
+         if (XINT (x, i) != XINT (y, i))
+           return 0;

          break;
 
          break;
 

-       case 'E':

        case 'V':
        case 'V':

-         XVEC (copy, i) = XVEC (orig, i);
-         if (XVEC (orig, i) != NULL)
-           {
-             XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
-             for (j = 0; j < XVECLEN (copy, i); j++)
-               XVECEXP (copy, i, j)
-                 = copy_most_rtx (XVECEXP (orig, i, j), may_share);
-           }
-         break;
+       case 'E':
+         /* Two vectors must have the same length.  */
+         if (XVECLEN (x, i) != XVECLEN (y, i))
+           return 0;

 
 

-       case 'w':
-         XWINT (copy, i) = XWINT (orig, i);
+         /* And the corresponding elements must match.  */
+         for (j = 0; j < XVECLEN (x, i); j++)
+           if (rtx_equal_p_cb (XVECEXP (x, i, j),
+                                XVECEXP (y, i, j), cb) == 0)
+             return 0;

          break;
 
          break;
 

-       case 'n':
-       case 'i':
-         XINT (copy, i) = XINT (orig, i);
+       case 'e':
+         if (rtx_equal_p_cb (XEXP (x, i), XEXP (y, i), cb) == 0)
+           return 0;

          break;
 
          break;
 

-       case 't':
-         XTREE (copy, i) = XTREE (orig, i);
+       case 'S':
+       case 's':
+         if ((XSTR (x, i) || XSTR (y, i))
+             && (! XSTR (x, i) || ! XSTR (y, i)
+                 || strcmp (XSTR (x, i), XSTR (y, i))))
+           return 0;

          break;
 
          break;
 

-       case 's':
-       case 'S':
-         XSTR (copy, i) = XSTR (orig, i);
+       case 'u':
+         /* These are just backpointers, so they don't matter.  */

          break;
 
        case '0':
          break;
 
        case '0':

-         /* Copy this through the wide int field; that's safest.  */
-         X0WINT (copy, i) = X0WINT (orig, i);
+       case 't':

          break;
 
          break;
 

+         /* It is believed that rtx's at this level will never
+            contain anything but integers and other rtx's,
+            except for within LABEL_REFs and SYMBOL_REFs.  */

        default:
        default:

-         abort ();
+         gcc_unreachable ();

        }
     }
        }
     }

-  return copy;
-}
-
-/* Create a new copy of an rtx.  Only copy just one level.  */
-
-rtx
-shallow_copy_rtx (orig)
-     rtx orig;
-{
-  int i;
-  RTX_CODE code = GET_CODE (orig);
-  rtx copy = rtx_alloc (code);
-
-  PUT_MODE (copy, GET_MODE (orig));
-  copy->in_struct = orig->in_struct;
-  copy->volatil = orig->volatil;
-  copy->unchanging = orig->unchanging;
-  copy->integrated = orig->integrated;
-  copy->frame_related = orig->frame_related;
-
-  for (i = 0; i < GET_RTX_LENGTH (code); i++)
-    copy->fld[i] = orig->fld[i];
-
-  return copy;
-}
-
-/* Return the alignment of MODE. This will be bounded by 1 and
-   BIGGEST_ALIGNMENT.  */
-
-unsigned int
-get_mode_alignment (mode)
-     enum machine_mode mode;
-{
-  unsigned int alignment = GET_MODE_UNIT_SIZE (mode);
-  
-  /* Extract the LSB of the size.  */
-  alignment = alignment & -alignment;
-  alignment *= BITS_PER_UNIT;
-
-  alignment = MIN (BIGGEST_ALIGNMENT, MAX (1, alignment));
-  return alignment;
+  return 1;

 }
 }

-\f
-/* This is 1 until after the rtl generation pass.  */
-int rtx_equal_function_value_matters;

 
 

-/* Nonzero when we are generating CONCATs.  */
-int generating_concat_p;
-\f

 /* Return 1 if X and Y are identical-looking rtx's.
 /* Return 1 if X and Y are identical-looking rtx's.

-   This is the Lisp function EQUAL for rtx arguments.  */
+   This is the Lisp function EQUAL for rtx arguments.
+   Whenever changing this function check if rtx_equal_p_cb above doesn't need
+   changing as well.  */

 
 int
 
 int

-rtx_equal_p (x, y)
-     rtx x, y;
+rtx_equal_p (const_rtx x, const_rtx y)

 {
   int i;
   int j;
 {
   int i;
   int j;


@@ -604,18 +503,15 @@ rtx_equal_p (x, y)
   if (GET_MODE (x) != GET_MODE (y))
     return 0;
 
   if (GET_MODE (x) != GET_MODE (y))
     return 0;
 

+  /* MEMs refering to different address space are not equivalent.  */
+  if (code == MEM && MEM_ADDR_SPACE (x) != MEM_ADDR_SPACE (y))
+    return 0;
+

   /* Some RTL can be compared nonrecursively.  */
   switch (code)
     {
     case REG:
   /* Some RTL can be compared nonrecursively.  */
   switch (code)
     {
     case REG:

-      /* Until rtl generation is complete, don't consider a reference
-        to the return register of the current function the same as
-        the return from a called function.  This eases the job of
-        function integration.  Once the distinction is no longer
-        needed, they can be considered equivalent.  */
-      return (REGNO (x) == REGNO (y)
-             && (! rtx_equal_function_value_matters
-                 || REG_FUNCTION_VALUE_P (x) == REG_FUNCTION_VALUE_P (y)));
+      return (REGNO (x) == REGNO (y));

 
     case LABEL_REF:
       return XEXP (x, 0) == XEXP (y, 0);
 
     case LABEL_REF:
       return XEXP (x, 0) == XEXP (y, 0);


@@ -623,9 +519,12 @@ rtx_equal_p (x, y)
     case SYMBOL_REF:
       return XSTR (x, 0) == XSTR (y, 0);
 
     case SYMBOL_REF:
       return XSTR (x, 0) == XSTR (y, 0);
 

+    case DEBUG_EXPR:
+    case VALUE:

     case SCRATCH:
     case CONST_DOUBLE:
     case CONST_INT:
     case SCRATCH:
     case CONST_DOUBLE:
     case CONST_INT:

+    case CONST_FIXED:

       return 0;
 
     default:
       return 0;
 
     default:


@@ -633,7 +532,7 @@ rtx_equal_p (x, y)
     }
 
   /* Compare the elements.  If any pair of corresponding elements
     }
 
   /* Compare the elements.  If any pair of corresponding elements

-     fail to match, return 0 for the whole things.  */
+     fail to match, return 0 for the whole thing.  */

 
   fmt = GET_RTX_FORMAT (code);
   for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
 
   fmt = GET_RTX_FORMAT (code);
   for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)


@@ -659,7 +558,7 @@ rtx_equal_p (x, y)
 
          /* And the corresponding elements must match.  */
          for (j = 0; j < XVECLEN (x, i); j++)
 
          /* And the corresponding elements must match.  */
          for (j = 0; j < XVECLEN (x, i); j++)

-           if (rtx_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)) == 0)
+           if (rtx_equal_p (XVECEXP (x, i, j),  XVECEXP (y, i, j)) == 0)

              return 0;
          break;
 
              return 0;
          break;
 


@@ -670,7 +569,9 @@ rtx_equal_p (x, y)
 
        case 'S':
        case 's':
 
        case 'S':
        case 's':

-         if (strcmp (XSTR (x, i), XSTR (y, i)))
+         if ((XSTR (x, i) || XSTR (y, i))
+             && (! XSTR (x, i) || ! XSTR (y, i)
+                 || strcmp (XSTR (x, i), XSTR (y, i))))

            return 0;
          break;
 
            return 0;
          break;
 


@@ -686,35 +587,57 @@ rtx_equal_p (x, y)
             contain anything but integers and other rtx's,
             except for within LABEL_REFs and SYMBOL_REFs.  */
        default:
             contain anything but integers and other rtx's,
             except for within LABEL_REFs and SYMBOL_REFs.  */
        default:

-         abort ();
+         gcc_unreachable ();

        }
     }
   return 1;
 }
        }
     }
   return 1;
 }

+
+void
+dump_rtx_statistics (void)
+{
+#ifdef GATHER_STATISTICS
+  int i;
+  int total_counts = 0;
+  int total_sizes = 0;
+  fprintf (stderr, "\nRTX Kind               Count      Bytes\n");
+  fprintf (stderr, "---------------------------------------\n");
+  for (i = 0; i < LAST_AND_UNUSED_RTX_CODE; i++)
+    if (rtx_alloc_counts[i])
+      {
+        fprintf (stderr, "%-20s %7d %10d\n", GET_RTX_NAME (i),
+                 rtx_alloc_counts[i], rtx_alloc_sizes[i]);
+        total_counts += rtx_alloc_counts[i];
+        total_sizes += rtx_alloc_sizes[i];
+      }
+  if (rtvec_alloc_counts)
+    {
+      fprintf (stderr, "%-20s %7d %10d\n", "rtvec",
+               rtvec_alloc_counts, rtvec_alloc_sizes);
+      total_counts += rtvec_alloc_counts;
+      total_sizes += rtvec_alloc_sizes;
+    }
+  fprintf (stderr, "---------------------------------------\n");
+  fprintf (stderr, "%-20s %7d %10d\n",
+           "Total", total_counts, total_sizes);
+  fprintf (stderr, "---------------------------------------\n");
+#endif
+}

 \f
 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 void
 \f
 #if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
 void

-rtl_check_failed_bounds (r, n, file, line, func)
-    rtx r;
-    int n;
-    const char *file;
-    int line;
-    const char *func;
+rtl_check_failed_bounds (const_rtx r, int n, const char *file, int line,
+                        const char *func)

 {
   internal_error
 {
   internal_error

-    ("RTL check: access of elt %d of `%s' with last elt %d in %s, at %s:%d",
+    ("RTL check: access of elt %d of '%s' with last elt %d in %s, at %s:%d",

      n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
      func, trim_filename (file), line);
 }
 
 void
      n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
      func, trim_filename (file), line);
 }
 
 void

-rtl_check_failed_type1 (r, n, c1, file, line, func)
-    rtx r;
-    int n;
-    int c1;
-    const char *file;
-    int line;
-    const char *func;
+rtl_check_failed_type1 (const_rtx r, int n, int c1, const char *file, int line,
+                       const char *func)

 {
   internal_error
     ("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",
 {
   internal_error
     ("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",


@@ -723,14 +646,8 @@ rtl_check_failed_type1 (r, n, c1, file, line, func)
 }
 
 void
 }
 
 void

-rtl_check_failed_type2 (r, n, c1, c2, file, line, func)
-    rtx r;
-    int n;
-    int c1;
-    int c2;
-    const char *file;
-    int line;
-    const char *func;
+rtl_check_failed_type2 (const_rtx r, int n, int c1, int c2, const char *file,
+                       int line, const char *func)

 {
   internal_error
     ("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",
 {
   internal_error
     ("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",


@@ -739,43 +656,68 @@ rtl_check_failed_type2 (r, n, c1, c2, file, line, func)
 }
 
 void
 }
 
 void

-rtl_check_failed_code1 (r, code, file, line, func)
-    rtx r;
-    enum rtx_code code;
-    const char *file;
-    int line;
-    const char *func;
+rtl_check_failed_code1 (const_rtx r, enum rtx_code code, const char *file,
+                       int line, const char *func)

 {
 {

-  internal_error ("RTL check: expected code `%s', have `%s' in %s, at %s:%d",
+  internal_error ("RTL check: expected code '%s', have '%s' in %s, at %s:%d",

                  GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
                  trim_filename (file), line);
 }
 
 void
                  GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
                  trim_filename (file), line);
 }
 
 void

-rtl_check_failed_code2 (r, code1, code2, file, line, func)
-    rtx r;
-    enum rtx_code code1, code2;
-    const char *file;
-    int line;
-    const char *func;
+rtl_check_failed_code2 (const_rtx r, enum rtx_code code1, enum rtx_code code2,
+                       const char *file, int line, const char *func)

 {
   internal_error
 {
   internal_error

-    ("RTL check: expected code `%s' or `%s', have `%s' in %s, at %s:%d",
+    ("RTL check: expected code '%s' or '%s', have '%s' in %s, at %s:%d",

      GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
      func, trim_filename (file), line);
 }
 
      GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
      func, trim_filename (file), line);
 }
 

+void
+rtl_check_failed_code_mode (const_rtx r, enum rtx_code code, enum machine_mode mode,
+                           bool not_mode, const char *file, int line,
+                           const char *func)
+{
+  internal_error ((not_mode
+                  ? ("RTL check: expected code '%s' and not mode '%s', "
+                     "have code '%s' and mode '%s' in %s, at %s:%d")
+                  : ("RTL check: expected code '%s' and mode '%s', "
+                     "have code '%s' and mode '%s' in %s, at %s:%d")),
+                 GET_RTX_NAME (code), GET_MODE_NAME (mode),
+                 GET_RTX_NAME (GET_CODE (r)), GET_MODE_NAME (GET_MODE (r)),
+                 func, trim_filename (file), line);
+}
+
+/* Report that line LINE of FILE tried to access the block symbol fields
+   of a non-block symbol.  FUNC is the function that contains the line.  */
+
+void
+rtl_check_failed_block_symbol (const char *file, int line, const char *func)
+{
+  internal_error
+    ("RTL check: attempt to treat non-block symbol as a block symbol "
+     "in %s, at %s:%d", func, trim_filename (file), line);
+}
+

 /* XXX Maybe print the vector?  */
 void
 /* XXX Maybe print the vector?  */
 void

-rtvec_check_failed_bounds (r, n, file, line, func)
-    rtvec r;
-    int n;
-    const char *file;
-    int line;
-    const char *func;
+rtvec_check_failed_bounds (const_rtvec r, int n, const char *file, int line,
+                          const char *func)

 {
   internal_error
     ("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
      n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
 }
 #endif /* ENABLE_RTL_CHECKING */
 {
   internal_error
     ("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
      n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
 }
 #endif /* ENABLE_RTL_CHECKING */

+
+#if defined ENABLE_RTL_FLAG_CHECKING
+void
+rtl_check_failed_flag (const char *name, const_rtx r, const char *file,
+                      int line, const char *func)
+{
+  internal_error
+    ("RTL flag check: %s used with unexpected rtx code '%s' in %s, at %s:%d",
+     name, GET_RTX_NAME (GET_CODE (r)), func, trim_filename (file), line);
+}
+#endif /* ENABLE_RTL_FLAG_CHECKING */