https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118954
Bug ID: 118954
Summary: Miscompile at -O3
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: yunboni at smail dot nju.edu.cn
Target Milestone: ---
This code times out at -O3 and prints 0 at -O0/1/2/s:
int printf(const char *, ...);
int a, b, c, d;
void e(int f) {
int g[] = {5, 8};
int *h = g;
while (c < f) {
d = 0;
for (; d < f; d++)
c = h[d];
}
}
int main() {
int i = (0 == a + 1) - 1;
e(i + 3);
printf("%X\n", b);
}
Compiler Explorer: https://godbolt.org/z/T3e7rME61
It appears to be a recent regression, as it cannot be reproduced with GCC 14.2
or earlier.
