| Issue |
124387
|
| Summary |
[clang] Miscompile with -O2/3/s
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
cardigan1008
|
This code prints random value at `-O2/3/s` and -1 at `-O0/1`:
```c
int printf(const char *, ...);
int a, b;
void c(char d) { a = d; }
int e(int d) {
if (d < 0)
return 1;
return 0;
}
int f() {
if (b)
return 0;
return 1;
}
int g(int d) {
int h = 0;
if (3 + d)
h = f() - 1 - 1;
return e(h) + h + h;
}
int main() {
int i = g(0);
c(i);
printf("%d\n", a);
}
```
Compiler Explorer: https://godbolt.org/z/KfWsKxcvE
It starts from x86_64 clang 19.1.0.
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