simplify-rtx.c (simplify_replace_rtx): Use rtx_equal_p for all OLD_RTXes, not just REGs.

gcc/
	* simplify-rtx.c (simplify_replace_rtx): Use rtx_equal_p for
	all OLD_RTXes, not just REGs.  Use copy_rtx to create the
	replacement value.

From-SVN: r152646

gcc/ChangeLog

+2009-10-11  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	* simplify-rtx.c (simplify_replace_rtx): Use rtx_equal_p for
+	all OLD_RTXes, not just REGs.  Use copy_rtx to create the
+	replacement value.
+
 2009-10-11  Richard Guenther  <rguenther@suse.de>
 
 	* gimple.c (iterative_hash_type_name): Do not handle special

gcc/simplify-rtx.c

@@ -365,8 +365,8 @@ simplify_replace_rtx (rtx x, const_rtx old_rtx, rtx new_rtx)
      to build a new expression substituting recursively.  If we can't do
      anything, return our input.  */
 
-  if (x == old_rtx)
-    return new_rtx;
+  if (rtx_equal_p (x, old_rtx))
+    return copy_rtx (new_rtx);
 
   switch (GET_RTX_CLASS (code))
     {
@@ -445,11 +445,6 @@ simplify_replace_rtx (rtx x, const_rtx old_rtx, rtx new_rtx)
 	    return x;
 	  return gen_rtx_LO_SUM (mode, op0, op1);
 	}
-      else if (code == REG)
-	{
-	  if (rtx_equal_p (x, old_rtx))
-	    return new_rtx;
-	}
       break;
 
     default: