Fix PR tree-optimization/40219

From-SVN: r147807

gcc/ChangeLog

+2009-05-21  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR tree-optimization/40219
+	* tree.c (iterative_hash_expr): Make sure the builtin function is
+	a normal builtin function and not a front end or back end builtin
+	before indexing into the built_in_decls array.
+
 2009-05-22  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/38964

gcc/tree.c

@@ -5422,11 +5422,13 @@ iterative_hash_expr (const_tree t, hashval_t val)
 	return val;
       }
     case FUNCTION_DECL:
-      /* When referring to a built-in FUNCTION_DECL, use the
-	 __builtin__ form.  Otherwise nodes that compare equal
-	 according to operand_equal_p might get different
-	 hash codes.  */
-      if (DECL_BUILT_IN (t) && built_in_decls[DECL_FUNCTION_CODE (t)])
+      /* When referring to a built-in FUNCTION_DECL, use the __builtin__ form.
+	 Otherwise nodes that compare equal according to operand_equal_p might
+	 get different hash codes.  However, don't do this for machine specific
+	 or front end builtins, since the function code is overloaded in those
+	 cases.  */
+      if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL
+	  && built_in_decls[DECL_FUNCTION_CODE (t)])
 	{
 	  t = built_in_decls[DECL_FUNCTION_CODE (t)];
 	  code = TREE_CODE (t);