re PR middle-end/38343 (ice for legal code with -O2)

	PR middle-end/38343
	* builtins.c (fold_builtin_memory_op): Convert len to sizetype
	before using it in POINTER_PLUS_EXPR.

	* gcc.c-torture/compile/pr38343-2.c: New test.

From-SVN: r142363

gcc/ChangeLog

+2008-12-02  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/38343
+	* builtins.c (fold_builtin_memory_op): Convert len to sizetype
+	before using it in POINTER_PLUS_EXPR.
+
 2008-12-02  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/38359

gcc/builtins.c

@@ -8993,6 +8993,7 @@ fold_builtin_memory_op (tree dest, tree src, tree len, tree type, bool ignore, i
     len = fold_build2 (MINUS_EXPR, TREE_TYPE (len), len,
 		       ssize_int (1));
 
+  len = fold_convert (sizetype, len);
   dest = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (dest), dest, len);
   dest = fold_convert (type, dest);
   if (expr)

gcc/testsuite/ChangeLog

+2008-12-02  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/38343
+	* gcc.c-torture/compile/pr38343-2.c: New test.
+
 2008-12-02  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/38359

gcc/testsuite/gcc.c-torture/compile/pr38343-2.c

+/* PR middle-end/38343 */
+
+static struct S
+{
+  char f[6];
+} s[] = { {"01000"} };
+
+char *
+foo (void)
+{
+  return __builtin_stpcpy (s[0].f, "S0022");
+}