From: steven <steven@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 27 Nov 2006 23:15:38 +0000 (+0000)
Subject:         * alias.c (init_alias_analysis): Remove simplification loop
X-Git-Tag: upstream/4.9.2~51825
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=025fc2949d3dddc7b76abe1165ea6bb5be3ae967;p=platform%2Fupstream%2Flinaro-gcc.git

    * alias.c (init_alias_analysis): Remove simplification loop
        after propagating pointers.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@119262 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fa65b98..896826d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2006-11-27  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* alias.c (init_alias_analysis): Remove simplification loop
+	after propagating pointers.
+
 2006-11-27  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.c (x86_ext_80387_constants): Add m_K8, m_CORE2
diff --git a/gcc/alias.c b/gcc/alias.c
index d027b79..a3634ac 100644
--- a/gcc/alias.c
+++ b/gcc/alias.c
@@ -2586,38 +2586,6 @@ init_alias_analysis (void)
     if (reg_known_value[i] == 0)
       reg_known_value[i] = regno_reg_rtx[i + FIRST_PSEUDO_REGISTER];
 
-  /* Simplify the reg_base_value array so that no register refers to
-     another register, except to special registers indirectly through
-     ADDRESS expressions.
-
-     In theory this loop can take as long as O(registers^2), but unless
-     there are very long dependency chains it will run in close to linear
-     time.
-
-     This loop may not be needed any longer now that the main loop does
-     a better job at propagating alias information.  */
-  pass = 0;
-  do
-    {
-      changed = 0;
-      pass++;
-      for (ui = 0; ui < maxreg; ui++)
-	{
-	  rtx base = VEC_index (rtx, reg_base_value, ui);
-	  if (base && REG_P (base))
-	    {
-	      unsigned int base_regno = REGNO (base);
-	      if (base_regno == ui)		/* register set from itself */
-		VEC_replace (rtx, reg_base_value, ui, 0);
-	      else
-		VEC_replace (rtx, reg_base_value, ui,
-			     VEC_index (rtx, reg_base_value, base_regno));
-	      changed = 1;
-	    }
-	}
-    }
-  while (changed && pass < MAX_ALIAS_LOOP_PASSES);
-
   /* Clean up.  */
   free (new_reg_base_value);
   new_reg_base_value = 0;