| Issue |
53102
|
| Summary |
Missed optimization with `__attribute__((pure))`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
OfekShilon
|
```c++
int somefunc(const int&) __attribute__((pure));
void nothing();
int f(int i) {
i = somefunc(i);
i++;
nothing();
i++;
nothing();
i++;
return i;
}
```
The emitted code loads, increments, and stores `i` 3 times : https://godbolt.org/z/7YW7187s1
In gcc it doesn't: https://godbolt.org/z/Ye9aYn4MG
Also, if `somefunc` is made to return void, the optimization does kick in: https://godbolt.org/z/hsEdPThsf
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