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

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

From-SVN: r119262

gcc/ChangeLog

+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

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;