rs6000.c (def_builtin): Set TREE_READONLY instead of TREE_CONSTANT.

	* config/rs6000/rs6000.c (def_builtin): Set TREE_READONLY instead
	of TREE_CONSTANT.

From-SVN: r153038

gcc/ChangeLog

+2009-10-20  Jakub Jelinek  <jakub@redhat.com>
+
+	* config/rs6000/rs6000.c (def_builtin): Set TREE_READONLY instead
+	of TREE_CONSTANT.
+
 2009-10-20  Richard Sandiford  <rdsandiford@googlemail.com>
 
 	* rtl.h (simplify_replace_fn_rtx): Declare.

gcc/config/rs6000/rs6000.c

@@ -8530,7 +8530,7 @@ def_builtin (int mask, const char *name, tree type, int code)
 
 	  /* const function, function only depends on the inputs.  */
 	case RS6000_BTC_CONST:
-	  TREE_CONSTANT (t) = 1;
+	  TREE_READONLY (t) = 1;
 	  TREE_NOTHROW (t) = 1;
 	  break;
 
@@ -8554,7 +8554,7 @@ def_builtin (int mask, const char *name, tree type, int code)
 	      DECL_IS_NOVOPS (t) = 1;
 	    }
 	  else
-	    TREE_CONSTANT (t) = 1;
+	    TREE_READONLY (t) = 1;
 	  break;
 	}
     }