c-ubsan.c (ubsan_instrument_shift): Use op1_utype for MINUS_EXPR instead of unsigned_type_node.

	* c-ubsan.c (ubsan_instrument_shift): Use op1_utype for MINUS_EXPR
	instead of unsigned_type_node.

	* c-c++-common/ubsan/shift-8.c: New test.

From-SVN: r218163

gcc/c-family/ChangeLog

 2014-11-28  Marek Polacek  <polacek@redhat.com>
 
+	* c-ubsan.c (ubsan_instrument_shift): Use op1_utype for MINUS_EXPR
+	instead of unsigned_type_node.
+
+2014-11-28  Marek Polacek  <polacek@redhat.com>
+
 	PR c/63862
 	* c-ubsan.c (ubsan_instrument_shift): Change the type of a MINUS_EXPR
 	to op1_utype.

gcc/c-family/c-ubsan.c

@@ -166,7 +166,7 @@ ubsan_instrument_shift (location_t loc, enum tree_code code,
       && !TYPE_UNSIGNED (TREE_TYPE (op0))
       && (cxx_dialect >= cxx11))
     {
-      tree x = fold_build2 (MINUS_EXPR, unsigned_type_node, uprecm1,
+      tree x = fold_build2 (MINUS_EXPR, op1_utype, uprecm1,
 			    fold_convert (op1_utype, op1));
       tt = fold_convert_loc (loc, unsigned_type_for (type0), op0);
       tt = fold_build2 (RSHIFT_EXPR, TREE_TYPE (tt), tt, x);

gcc/testsuite/ChangeLog

+2014-11-28  Marek Polacek  <polacek@redhat.com>
+
+	* c-c++-common/ubsan/shift-8.c: New test.
+
 2014-11-28  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/64087

gcc/testsuite/c-c++-common/ubsan/shift-8.c

+/* { dg-do compile } */
+/* { dg-options "-fsanitize=undefined" } */
+/* { dg-additional-options "-std=gnu11" { target c } } */
+/* { dg-additional-options "-std=c++11" { target c++ } } */
+
+signed char
+fn1 (signed char x, unsigned long y)
+{
+  return x << y;
+}
+
+short int
+fn2 (short int x, unsigned long y)
+{
+  return x << y;
+}
+
+int
+fn3 (int x, unsigned long y)
+{
+  return x << y;
+}
+
+long int
+fn4 (long int x, unsigned long y)
+{
+  return x << y;
+}
+
+long long int
+fn5 (long long int x, unsigned long y)
+{
+  return x << y;
+}
+
+signed char
+fn6 (signed char x, unsigned long long y)
+{
+  return x << y;
+}
+
+short int
+fn7 (short int x, unsigned long long y)
+{
+  return x << y;
+}
+
+int
+fn8 (int x, unsigned long long y)
+{
+  return x << y;
+}
+
+long int
+fn9 (long int x, unsigned long long y)
+{
+  return x << y;
+}
+
+long long int
+fn10 (long long int x, unsigned long long y)
+{
+  return x << y;
+}