https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117532
Bug ID: 117532
Summary: Miscompile with -Os and -O0/1/2/3
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: ---
When I compiled this code with -Os, its output is -256. But with -O0/1/2/3, its
output is 0:
```c
int printf(const char *, ...);
int a, c = -1;
int main() {
a = ~c;
printf("%d\n", (unsigned char)a);
}
```
Details can be found here: https://godbolt.org/z/o77dorWzr
