| Issue |
53502
|
| Summary |
[clang] missed optimization: bool addition not converted to boolean or
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
avikivity
|
```c++
bool bool_or(bool b1, bool b2) {
return b1 + b2;
}
```
generates (clang 13)
```
bool_or(bool, bool): # @bool_or(bool, bool)
negl %esi
cmpl %esi, %edi
setne %al
retq
```
However it can remove an instruction:
```
bool_or(bool, bool): # @bool_or(bool, bool)
orl %edi, %esi
mov %esi, %ax
retq
```
Boolean multiplication generates an `andl` already.
This can happen when feeding std::plus<bool> to things like `std::reduce`.
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