@@ -1370,15 +1370,17 @@ c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands,
&& c_inhibit_evaluation_warnings == 0)
{
if (tree_int_cst_sgn (op1) < 0)
- warning_at (loc, 0, (code == LSHIFT_EXPR
- ? G_("left shift count is negative")
- : G_("right shift count is negative")));
+ warning_at (loc, OPT_Wshift_count_negative,
+ (code == LSHIFT_EXPR
+ ? G_("left shift count is negative")
+ : G_("right shift count is negative")));
else if (compare_tree_int (op1,
TYPE_PRECISION (TREE_TYPE (orig_op0)))
>= 0)
- warning_at (loc, 0, (code == LSHIFT_EXPR
- ? G_("left shift count >= width of type")
- : G_("right shift count >= width of type")));
+ warning_at (loc, OPT_Wshift_count_overflow,
+ (code == LSHIFT_EXPR
+ ? G_("left shift count >= width of type")
+ : G_("right shift count >= width of type")));
}
if ((code == TRUNC_DIV_EXPR
|| code == CEIL_DIV_EXPR
@@ -0,0 +1,16 @@
+/* PR c/65830 */
+/* { dg-do compile } */
+/* { dg-options "-O -Wno-shift-count-negative -Wno-shift-count-overflow" } */
+
+int
+foo (int x)
+{
+ const int a = sizeof (int) * __CHAR_BIT__;
+ const int b = -7;
+ int c = 0;
+ c += x << a; /* { dg-bogus "left shift count >= width of type" } */
+ c += x << b; /* { dg-bogus "left shift count is negative" } */
+ c += x >> a; /* { dg-bogus "right shift count >= width of type" } */
+ c += x >> b; /* { dg-bogus "right shift count is negative" } */
+ return c;
+}