https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117574
Bug ID: 117574
Summary: Miscompile with -O2/3 and -O0/1
Product: gcc
Version: 9.1.0
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: ---
When I compiled this code with -O2/3, it triggered SIGKILL. With -O0/1, it
returned 0:
```c
int printf(const char *, ...);
int a, c;
long b;
short d;
long e(long f, long h, long i) {
for (long g = f; g <= h; g += i)
b += g;
return b;
}
int main() {
c = 1;
for (; c >= 0; c--)
;
for (; e(d + 40, d + 76, c + 51) < 4;)
;
printf("%X\n", a);
}
```
I did tried compiled it with -fwrapv and it worked. But I didn't see overflow
in this code. You can check here: https://godbolt.org/z/G1T43nPh5 Please let me
know if I’ve made any mistakes here. Thanks!
The earliest version of this bug is x86_64 9.1.0. Details can be found here:
https://godbolt.org/z/1hqYq1af8
