https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111408
Bug ID: 111408
Summary: [14 Regression] Wrong code at -O2/3 on
x86_64-linux-gnu since r14-2866-ge68a31549d9
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
Target Milestone: ---
gcc at -O2/s produced the wrong code.
Bisected to r14-2866-ge68a31549d9
Compiler explorer: https://godbolt.org/z/secjqP8ao
$ cat a.c
int printf(const char *, ...);
int a, b, c, d;
short e;
int f() {
c = a % (sizeof(int) * 8);
if (b & 1 << c)
return -1;
return 0;
}
int main() {
for (; e != 1; e++) {
int g = f();
if (g + d - 9 + d)
continue;
for (;;)
__builtin_abort();
}
}
$
$ gcc -O0 a.c && ./a.out
$
$ gcc -O2 a.c && ./a.out
[2] 1281121 abort ./a.out
$
