| Issue |
66236
|
| Summary |
Missing decorations for builtin library functions
|
| Labels |
|
| Assignees |
|
| Reporter |
OfekShilon
|
The library function `cos` redirects to `__builtin_cos`. It, and many others, could be treated as `__attribute__((const))` but aren't. Optimizations are missed as a result.
toy example:
```c
void whateva();
void pureFunc(double d) __attribute__((pure));
void fun(double d) {
pureFunc(d); // call eliminated in EarlyCSEPass
__builtin_cos(d); // call never eliminated
whateva();
}
```
https://godbolt.org/z/KP88hnxoP
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