https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118064
Bug ID: 118064
Summary: Miscompilation at -O1
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 prints 1 at -O1 and 0 at -O0/2/3:
```c
int printf(const char *, ...);
short a;
int b;
int *const c = &b;
static int *d = &b;
long e = 1;
char(f)(char g, char h) { return g - h; }
int main() {
int *i = &b;
for (; a != 2; ++a) {
*c ^= 1;
if (*d)
;
else {
*c = f(*i, 1) || *i;
if (*c)
e = 0;
}
}
printf("%d\n", (int)e);
}
```
Compiler Explorer: https://godbolt.org/z/K3fEfnd8o
Bisected to
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=e8febb641415fd80eabce1c4fdf2d4a4b411213b
