You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.1 KiB
39 lines
1.1 KiB
2017-09-18 Richard Biener <rguenther@suse.de>
|
|
|
|
Backport from mainline
|
|
2017-04-10 Richard Biener <rguenther@suse.de>
|
|
|
|
PR middle-end/80362
|
|
* fold-const.c (fold_binary_loc): Look at unstripped ops when
|
|
looking for NEGATE_EXPR in -A / -B to A / B folding.
|
|
|
|
* gcc.dg/torture/pr80362.c: New testcase.
|
|
|
|
--- gcc/fold-const.c
|
|
+++ gcc/fold-const.c
|
|
@@ -11940,8 +11942,8 @@ fold_binary_loc (location_t loc,
|
|
/* Convert -A / -B to A / B when the type is signed and overflow is
|
|
undefined. */
|
|
if ((!INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_UNDEFINED (type))
|
|
- && TREE_CODE (arg0) == NEGATE_EXPR
|
|
- && negate_expr_p (arg1))
|
|
+ && TREE_CODE (op0) == NEGATE_EXPR
|
|
+ && negate_expr_p (op1))
|
|
{
|
|
if (INTEGRAL_TYPE_P (type))
|
|
fold_overflow_warning (("assuming signed overflow does not occur "
|
|
--- /dev/null
|
|
+++ gcc/testsuite/gcc.dg/torture/pr80362.c
|
|
@@ -0,0 +1,11 @@
|
|
+/* { dg-do run } */
|
|
+/* { dg-additional-options "-fstrict-overflow" } */
|
|
+
|
|
+int main()
|
|
+{
|
|
+ signed char var_0, var_1 = -128;
|
|
+ var_0 = (signed char)(-var_1) / 3;
|
|
+ if (var_0 > 0)
|
|
+ __builtin_abort();
|
|
+ return 0;
|
|
+}
|