builtins.c (fold_builtin_signbit): Build the comparison with a proper type.

2011-07-29  Richard Guenther  <rguenther@suse.de>

	* builtins.c (fold_builtin_signbit): Build the comparison
	with a proper type.

From-SVN: r176922

gcc/ChangeLog

 2011-07-29  Richard Guenther  <rguenther@suse.de>
 
+	* builtins.c (fold_builtin_signbit): Build the comparison
+	with a proper type.
+
+2011-07-29  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/49893
 	* tree-predcom.c (suitable_reference_p): Volatile references
 	are not suitable.

gcc/builtins.c

@@ -8645,8 +8645,9 @@ fold_builtin_signbit (location_t loc, tree arg, tree type)
 
   /* If ARG's format doesn't have signed zeros, return "arg < 0.0".  */
   if (!HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (arg))))
-    return fold_build2_loc (loc, LT_EXPR, type, arg,
-			build_real (TREE_TYPE (arg), dconst0));
+    return fold_convert (type,
+			 fold_build2_loc (loc, LT_EXPR, boolean_type_node, arg,
+			build_real (TREE_TYPE (arg), dconst0)));
 
   return NULL_TREE;
 }