https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111233
Bug ID: 111233
Summary: Wrong code at -O3 on x86_64-linux-gnu since
r14-2852-gf5fb9ff2396
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
CC: hubicka at gcc dot gnu.org, jh at suse dot cz
Target Milestone: ---
gcc at -O3 produces the wrong code.
Bisected to r14-2852-gf5fb9ff2396
Compiler explorer: https://godbolt.org/z/vrEMjKr9f
$ cat a.c
int printf(const char *, ...);
int a, c, f;
char b, g;
int *d = &c;
long e;
int main() {
for (; e != 25; e++) {
f = -17;
for (; f <= 0; f = f + 7) {
g = f ? 0 : b;
a = *d;
}
}
printf("%d\n", a);g
}
$
$ gcc -O2 a.c && ./a.out
0
$ gcc -O3 a.c
$ ./a.out
(Timeout)
$
