fold-const.c (fold_convert): Don't call size_int_type_wide if input overflows.

	* fold-const.c (fold_convert): Don't call size_int_type_wide if
	input overflows.

From-SVN: r40012

gcc/ChangeLog

 Fri Feb 23 15:28:39 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
+	* fold-const.c (fold_convert): Don't call size_int_type_wide if
+	input overflows.
+
 	* c-decl.c (set_block): Set NAMES and BLOCKS from BLOCK.
 
 	* varasm.c (output_constant): Recompute CODE after lang-specific fn.

gcc/fold-const.c

@@ -2022,6 +2022,7 @@ fold_convert (t, arg1)
 	  /* If we are trying to make a sizetype for a small integer, use
 	     size_int to pick up cached types to reduce duplicate nodes.  */
 	  if (TREE_CODE (type) == INTEGER_TYPE && TYPE_IS_SIZETYPE (type)
+	      && !TREE_CONSTANT_OVERFLOW (arg1)
 	      && compare_tree_int (arg1, 10000) < 0)
 	    return size_int_type_wide (TREE_INT_CST_LOW (arg1), type);