https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118148
Bug ID: 118148
Summary: Miscompilation at -Os
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 256 at -Os and 0 at -O0/1/2/3:
```c
int printf(const char *, ...);
short a;
int b;
short *c = &a;
static int(d)(int e, unsigned f) { return e < 0 || f ? e : 0; }
static char g(long e, unsigned char f) {
f++;
b = d(f, e);
*c = b;
return 0;
}
int main() {
g(4073709551609, 255);
printf("%d\n", a);
}
```
Bisected to:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=96fb71883d438bdb241fdf9c7d12f945c5ba0c7f
Compiler Explorer: https://godbolt.org/z/3d8bWv9Kc
