| Issue |
209010
|
| Summary |
[Clang] Wrong code at -O2/3 on x86_64-linux_gnu
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
zxt5
|
Compiler Explorer: https://godbolt.org/z/bPK3c746h
- fails: trunk
- works: 22.1.0 and earlier
small.c
```c
#include <stdio.h>
short a, h, b, c;
int d = 9, e;
int main() {
e = a;
h = 0;
for (; h <= 2; h++) {
int f = e | 5;
b = 2;
for (; b >= 0; b--)
d &= (++c ^ f) < 58593;
}
printf("%d\n", d);
}
```
```
$ clang-trunk -v
clang version 23.0.0git (https://github.com/llvm/llvm-project.git e62c0cb076fbcb70752530571726944648a48829)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /data/x27zhou/compiler-nightly/install/llvm/bin
Build config: +assertions
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda, version 12.3
$ clang-trunk -O0 small.c && ./a.out
1
$ clang-trunk -O3 small.c && ./a.out
0
```
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