2008-05-11 Aaron W. LaFramboise <aaronavay62@aaronwl.com>

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

diff --git a/gcc/web.c b/gcc/web.c
index d20bcfb..ada150e 100644 (file)
--- a/gcc/web.c
+++ b/gcc/web.c
@@ -1,12 +1,13 @@
 /* Web construction code for GNU compiler.
    Contributed by Jan Hubicka.
 /* Web construction code for GNU compiler.
    Contributed by Jan Hubicka.

-   Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2002, 2004, 2006, 2007
+   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


@@ -15,9 +16,8 @@ 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/>.  */

 
 /* Simple optimization pass that splits independent uses of each pseudo,
    increasing effectiveness of other optimizations.  The optimization can
 
 /* Simple optimization pass that splits independent uses of each pseudo,
    increasing effectiveness of other optimizations.  The optimization can


@@ -51,32 +51,21 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #include "rtl.h"
 #include "hard-reg-set.h"
 #include "flags.h"
 #include "rtl.h"
 #include "hard-reg-set.h"
 #include "flags.h"

+#include "obstack.h"

 #include "basic-block.h"
 #include "output.h"
 #include "df.h"
 #include "function.h"
 #include "basic-block.h"
 #include "output.h"
 #include "df.h"
 #include "function.h"

+#include "timevar.h"
+#include "tree-pass.h"

 
 
 
 

-/* This entry is allocated for each reference in the insn stream.  */
-struct web_entry
-{
-  /* Pointer to the parent in the union/find tree.  */
-  struct web_entry *pred;
-  /* Newly assigned register to the entry.  Set only for roots.  */
-  rtx reg;
-};
-
-static struct web_entry *unionfind_root (struct web_entry *);
-static void unionfind_union (struct web_entry *, struct web_entry *);
-static void union_defs (struct df *, struct ref *, struct web_entry *, 
-                        struct web_entry *);
-static rtx entry_register (struct web_entry *, struct ref *, char *, char *);
-static void replace_ref (struct ref *, rtx);
-static int mark_addressof (rtx *, void *);
+static rtx entry_register (struct web_entry *, struct df_ref *, char *);
+static void replace_ref (struct df_ref *, rtx);

 
 /* Find the root of unionfind tree (the representative of set).  */
 
 
 /* Find the root of unionfind tree (the representative of set).  */
 

-static struct web_entry *
+struct web_entry *

 unionfind_root (struct web_entry *element)
 {
   struct web_entry *element1 = element, *element2;
 unionfind_root (struct web_entry *element)
 {
   struct web_entry *element1 = element, *element2;


@@ -92,43 +81,75 @@ unionfind_root (struct web_entry *element)
   return element;
 }
 
   return element;
 }
 

-/* Union sets.  */
+/* Union sets.  
+   Return true if FIRST and SECOND points to the same web entry structure and
+   nothing is done.  Otherwise, return false.  */

 
 

-static void
+bool

 unionfind_union (struct web_entry *first, struct web_entry *second)
 {
   first = unionfind_root (first);
   second = unionfind_root (second);
   if (first == second)
 unionfind_union (struct web_entry *first, struct web_entry *second)
 {
   first = unionfind_root (first);
   second = unionfind_root (second);
   if (first == second)

-    return;
+    return true;

   second->pred = first;
   second->pred = first;

+  return false;

 }
 
 /* For each use, all possible defs reaching it must come in the same
 }
 
 /* For each use, all possible defs reaching it must come in the same

-   register, union them.  */
+   register, union them.
+   FUN is the function that does the union.  */

 
 

-static void
-union_defs (struct df *df, struct ref *use, struct web_entry *def_entry,
-            struct web_entry *use_entry)
+void
+union_defs (struct df_ref *use, struct web_entry *def_entry,
+           struct web_entry *use_entry,
+           bool (*fun) (struct web_entry *, struct web_entry *))

 {
   rtx insn = DF_REF_INSN (use);
   struct df_link *link = DF_REF_CHAIN (use);
 {
   rtx insn = DF_REF_INSN (use);
   struct df_link *link = DF_REF_CHAIN (use);

-  struct df_link *use_link = DF_INSN_USES (df, insn);
-  struct df_link *def_link = DF_INSN_DEFS (df, insn);
-  rtx set = single_set (insn);
+  struct df_ref **use_link;
+  struct df_ref **eq_use_link;
+  struct df_ref **def_link;
+  rtx set;
+
+  if (insn)
+    {
+      use_link = DF_INSN_USES (insn);
+      eq_use_link = DF_INSN_EQ_USES (insn);
+      def_link = DF_INSN_DEFS (insn);
+      set = single_set (insn);
+    }
+  else
+    {
+      use_link = NULL;
+      eq_use_link = NULL;
+      def_link = NULL;
+      set = NULL;
+    }

 
   /* Some instructions may use match_dup for their operands.  In case the
      operands are dead, we will assign them different pseudos, creating
      invalid instructions, so union all uses of the same operand for each
      insn.  */
 
 
   /* Some instructions may use match_dup for their operands.  In case the
      operands are dead, we will assign them different pseudos, creating
      invalid instructions, so union all uses of the same operand for each
      insn.  */
 

-  while (use_link)
-    {
-      if (use != use_link->ref
-         && DF_REF_REAL_REG (use) == DF_REF_REAL_REG (use_link->ref))
-       unionfind_union (use_entry + DF_REF_ID (use),
-                        use_entry + DF_REF_ID (use_link->ref));
-      use_link = use_link->next;
+  if (use_link)
+    while (*use_link)
+      {
+       if (use != *use_link
+           && DF_REF_REAL_REG (use) == DF_REF_REAL_REG (*use_link))
+         (*fun) (use_entry + DF_REF_ID (use),
+                 use_entry + DF_REF_ID (*use_link));
+       use_link++;
+      }
+
+  if (eq_use_link)
+    while (*eq_use_link)
+      {
+       if (use != *eq_use_link
+           && DF_REF_REAL_REG (use) == DF_REF_REAL_REG (*eq_use_link))
+         (*fun) (use_entry + DF_REF_ID (use),
+                 use_entry + DF_REF_ID (*eq_use_link));
+       eq_use_link++;

     }
 
   /* Recognize trivial noop moves and attempt to keep them as noop.
     }
 
   /* Recognize trivial noop moves and attempt to keep them as noop.


@@ -139,18 +160,19 @@ union_defs (struct df *df, struct ref *use, struct web_entry *def_entry,
       && SET_SRC (set) == DF_REF_REG (use)
       && SET_SRC (set) == SET_DEST (set))
     {
       && SET_SRC (set) == DF_REF_REG (use)
       && SET_SRC (set) == SET_DEST (set))
     {

-      while (def_link)
-       {
-         if (DF_REF_REAL_REG (use) == DF_REF_REAL_REG (def_link->ref))
-           unionfind_union (use_entry + DF_REF_ID (use),
-                            def_entry + DF_REF_ID (def_link->ref));
-         def_link = def_link->next;
-       }
+      if (def_link)
+       while (*def_link)
+         {
+           if (DF_REF_REAL_REG (use) == DF_REF_REAL_REG (*def_link))
+             (*fun) (use_entry + DF_REF_ID (use),
+                     def_entry + DF_REF_ID (*def_link));
+           def_link++;
+         }

     }
   while (link)
     {
     }
   while (link)
     {

-      unionfind_union (use_entry + DF_REF_ID (use),
-                      def_entry + DF_REF_ID (link->ref));
+      (*fun) (use_entry + DF_REF_ID (use),
+             def_entry + DF_REF_ID (link->ref));

       link = link->next;
     }
 
       link = link->next;
     }
 


@@ -158,21 +180,28 @@ union_defs (struct df *df, struct ref *use, struct web_entry *def_entry,
      register.  Find it and union.  */
   if (use->flags & DF_REF_READ_WRITE)
     {
      register.  Find it and union.  */
   if (use->flags & DF_REF_READ_WRITE)
     {

-      struct df_link *link = DF_INSN_DEFS (df, DF_REF_INSN (use));
-
-      while (DF_REF_REAL_REG (link->ref) != DF_REF_REAL_REG (use))
-       link = link->next;
-
-      unionfind_union (use_entry + DF_REF_ID (use),
-                      def_entry + DF_REF_ID (link->ref));
+      struct df_ref **link;
+
+      if (DF_REF_INSN (use))
+       link = DF_INSN_DEFS (DF_REF_INSN (use));
+      else
+       link = NULL;
+
+      if (link)
+       while (*link)
+         {
+           if (DF_REF_REAL_REG (*link) == DF_REF_REAL_REG (use))
+             (*fun) (use_entry + DF_REF_ID (use),
+                     def_entry + DF_REF_ID (*link));
+           link++;
+         }

     }
 }
 
 /* Find the corresponding register for the given entry.  */
 
 static rtx
     }
 }
 
 /* Find the corresponding register for the given entry.  */
 
 static rtx

-entry_register (struct web_entry *entry, struct ref *ref, char *used, 
-                char *use_addressof)
+entry_register (struct web_entry *entry, struct df_ref *ref, char *used)

 {
   struct web_entry *root;
   rtx reg, newreg;
 {
   struct web_entry *root;
   rtx reg, newreg;


@@ -191,29 +220,19 @@ entry_register (struct web_entry *entry, struct ref *ref, char *used,
   else if (REG_USERVAR_P (reg) && 0/*&& !flag_messy_debugging*/)
     {
       newreg = reg;
   else if (REG_USERVAR_P (reg) && 0/*&& !flag_messy_debugging*/)
     {
       newreg = reg;

-      if (rtl_dump_file)
-       fprintf (rtl_dump_file,
+      if (dump_file)
+       fprintf (dump_file,

                 "New web forced to keep reg=%i (user variable)\n",
                 REGNO (reg));
     }
                 "New web forced to keep reg=%i (user variable)\n",
                 REGNO (reg));
     }

-  else if (use_addressof [REGNO (reg)])
-    {
-      newreg = reg;
-      if (rtl_dump_file)
-       fprintf (rtl_dump_file,
-                "New web forced to keep reg=%i (address taken)\n",
-                REGNO (reg));
-    }

   else
     {
       newreg = gen_reg_rtx (GET_MODE (reg));
       REG_USERVAR_P (newreg) = REG_USERVAR_P (reg);
       REG_POINTER (newreg) = REG_POINTER (reg);
   else
     {
       newreg = gen_reg_rtx (GET_MODE (reg));
       REG_USERVAR_P (newreg) = REG_USERVAR_P (reg);
       REG_POINTER (newreg) = REG_POINTER (reg);

-      REG_LOOP_TEST_P (newreg) = REG_LOOP_TEST_P (reg);
-      RTX_UNCHANGING_P (newreg) = RTX_UNCHANGING_P (reg);

       REG_ATTRS (newreg) = REG_ATTRS (reg);
       REG_ATTRS (newreg) = REG_ATTRS (reg);

-      if (rtl_dump_file)
-       fprintf (rtl_dump_file, "Web oldreg=%i newreg=%i\n", REGNO (reg),
+      if (dump_file)
+       fprintf (dump_file, "Web oldreg=%i newreg=%i\n", REGNO (reg),

                 REGNO (newreg));
     }
 
                 REGNO (newreg));
     }
 


@@ -224,83 +243,151 @@ entry_register (struct web_entry *entry, struct ref *ref, char *used,
 /* Replace the reference by REG.  */
 
 static void
 /* Replace the reference by REG.  */
 
 static void

-replace_ref (struct ref *ref, rtx reg)
+replace_ref (struct df_ref *ref, rtx reg)

 {
   rtx oldreg = DF_REF_REAL_REG (ref);
   rtx *loc = DF_REF_REAL_LOC (ref);
 {
   rtx oldreg = DF_REF_REAL_REG (ref);
   rtx *loc = DF_REF_REAL_LOC (ref);

+  unsigned int uid = INSN_UID (DF_REF_INSN (ref));

 
   if (oldreg == reg)
     return;
 
   if (oldreg == reg)
     return;

-  if (rtl_dump_file)
-    fprintf (rtl_dump_file, "Updating insn %i (%i->%i)\n",
-            INSN_UID (DF_REF_INSN (ref)), REGNO (oldreg), REGNO (reg)); 
+  if (dump_file)
+    fprintf (dump_file, "Updating insn %i (%i->%i)\n",
+            uid, REGNO (oldreg), REGNO (reg)); 

   *loc = reg;
   *loc = reg;

+  df_insn_rescan (DF_REF_INSN (ref));

 }
 
 }
 

-/* Mark each pseudo whose address is taken.  */
-
-static int
-mark_addressof (rtx *rtl, void *data)
+\f
+static bool
+gate_handle_web (void)

 {
 {

-  if (!*rtl)
-    return 0;
-  if (GET_CODE (*rtl) == ADDRESSOF
-      && REG_P (XEXP (*rtl, 0)))
-    ((char *)data)[REGNO (XEXP (*rtl, 0))] = 1;
-  return 0;
+  return (optimize > 0 && flag_web);

 }
 
 /* Main entry point.  */
 
 }
 
 /* Main entry point.  */
 

-void
+static unsigned int

 web_main (void)
 {
 web_main (void)
 {

-  struct df *df;

   struct web_entry *def_entry;
   struct web_entry *use_entry;
   struct web_entry *def_entry;
   struct web_entry *use_entry;

-  unsigned int i;
-  int max = max_reg_num ();
+  unsigned int max = max_reg_num ();

   char *used;
   char *used;

-  char *use_addressof;
+  basic_block bb;
+  unsigned int uses_num = 0;

   rtx insn;
 
   rtx insn;
 

-  df = df_init ();
-  df_analyze (df, 0, DF_UD_CHAIN | DF_EQUIV_NOTES);
+  df_set_flags (DF_NO_HARD_REGS + DF_EQ_NOTES);
+  df_chain_add_problem (DF_UD_CHAIN);
+  df_analyze ();
+  df_set_flags (DF_DEFER_INSN_RESCAN);

 
 

-  def_entry =
-    (struct web_entry *) xcalloc (df->n_defs, sizeof (struct web_entry));
-  use_entry =
-    (struct web_entry *) xcalloc (df->n_uses, sizeof (struct web_entry));
-  used = (char *) xcalloc (max, sizeof (char));
-  use_addressof = (char *) xcalloc (max, sizeof (char));
+  /* Assign ids to the uses.  */
+  FOR_ALL_BB (bb)
+    FOR_BB_INSNS (bb, insn)
+    {
+      unsigned int uid = INSN_UID (insn);
+      if (INSN_P (insn))
+       {
+         struct df_ref **use_rec;
+         for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+           {
+             struct df_ref *use = *use_rec;
+             if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER)
+               DF_REF_ID (use) = uses_num++;
+           }
+         for (use_rec = DF_INSN_UID_EQ_USES (uid); *use_rec; use_rec++)
+           {
+             struct df_ref *use = *use_rec;
+             if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER)
+               DF_REF_ID (use) = uses_num++;
+           }
+       }
+    }

 
 

-  if (rtl_dump_file)
-    df_dump (df, DF_UD_CHAIN | DF_DU_CHAIN, rtl_dump_file);
+  /* Record the number of uses and defs at the beginning of the optimization.  */
+  def_entry = XCNEWVEC (struct web_entry, DF_DEFS_TABLE_SIZE());
+  used = XCNEWVEC (char, max);
+  use_entry = XCNEWVEC (struct web_entry, uses_num);

 
   /* Produce the web.  */
 
   /* Produce the web.  */

-  for (i = 0; i < df->n_uses; i++)
-    union_defs (df, df->uses[i], def_entry, use_entry);
-
-  /* We can not safely rename registers whose address is taken.  */
-  for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
-    if (INSN_P (insn))
-      for_each_rtx (&PATTERN (insn), mark_addressof, use_addressof);
+  FOR_ALL_BB (bb)
+    FOR_BB_INSNS (bb, insn)
+    {
+      unsigned int uid = INSN_UID (insn);
+      if (INSN_P (insn))
+       {
+         struct df_ref **use_rec;
+         for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+           {
+             struct df_ref *use = *use_rec;
+             if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER)
+               union_defs (use, def_entry, use_entry, unionfind_union);
+           }
+         for (use_rec = DF_INSN_UID_EQ_USES (uid); *use_rec; use_rec++)
+           {
+             struct df_ref *use = *use_rec;
+             if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER)
+               union_defs (use, def_entry, use_entry, unionfind_union);
+           }
+       }
+    }

 
   /* Update the instruction stream, allocating new registers for split pseudos
      in progress.  */
 
   /* Update the instruction stream, allocating new registers for split pseudos
      in progress.  */

-  for (i = 0; i < df->n_uses; i++)
-    replace_ref (df->uses[i], entry_register (use_entry + i, df->uses[i],
-                                             used, use_addressof));
-  for (i = 0; i < df->n_defs; i++)
-    replace_ref (df->defs[i], entry_register (def_entry + i, df->defs[i],
-                                             used, use_addressof));
-
-  /* Dataflow information is corrupt here, but it can be easily updated
-     by creating new entries for new registers and updates or calling
-     df_insns_modify.  */
+  FOR_ALL_BB (bb)
+    FOR_BB_INSNS (bb, insn)
+    {
+      unsigned int uid = INSN_UID (insn);
+      if (INSN_P (insn))
+       {
+         struct df_ref **use_rec;
+         struct df_ref **def_rec;
+         for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+           {
+             struct df_ref *use = *use_rec;
+             if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER)
+               replace_ref (use, entry_register (use_entry + DF_REF_ID (use), use, used));
+           }
+         for (use_rec = DF_INSN_UID_EQ_USES (uid); *use_rec; use_rec++)
+           {
+             struct df_ref *use = *use_rec;
+             if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER)
+               replace_ref (use, entry_register (use_entry + DF_REF_ID (use), use, used));
+           }
+         for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+           {
+             struct df_ref *def = *def_rec;
+             if (DF_REF_REGNO (def) >= FIRST_PSEUDO_REGISTER)
+               replace_ref (def, entry_register (def_entry + DF_REF_ID (def), def, used));
+           }
+       }
+    }
+

   free (def_entry);
   free (use_entry);
   free (used);
   free (def_entry);
   free (use_entry);
   free (used);

-  free (use_addressof);
-  df_finish (df);
+  return 0;

 }
 }

+\f
+struct rtl_opt_pass pass_web =
+{
+ {
+  RTL_PASS,
+  "web",                                /* name */
+  gate_handle_web,                      /* gate */
+  web_main,                            /* execute */
+  NULL,                                 /* sub */
+  NULL,                                 /* next */
+  0,                                    /* static_pass_number */
+  TV_WEB,                               /* tv_id */
+  0,                                    /* properties_required */
+  0,                                    /* properties_provided */
+  0,                                    /* properties_destroyed */
+  0,                                    /* todo_flags_start */
+  TODO_df_finish | TODO_verify_rtl_sharing | 
+  TODO_dump_func                        /* todo_flags_finish */
+ }
+};
+