| Issue |
117300
|
| Summary |
[LLVM] SIGSEGV with clang-trunk at -Os; Unexpected Behavior at -O1 vs Expected Infinite Loop at -O0 and gcc -O2
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
wangbo15
|
The following code triggers a `SIGSEGV` when compiled with `clang-trunk` and `clang 19.1.0` using the `-Os` optimization level.
With `-O1`, the program exits with a return value of `64`. However, when compiled with `clang` `-O0` or `gcc` `-O2`, the program behaves as expected and enters an infinite loop.
Additionally, the behavior cases are also different on the `arm` backends.
```
#include <memory>
unsigned long long a;
void b(unsigned long long *, int) {}
class {
public:
short c[10];
} e;
int main() {
for (size_t d;;)
b(&a, e.c[d]);
}
```
Please see: https://godbolt.org/z/79fzqePEv
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