| Issue |
180948
|
| Summary |
failed to reduce pow() with sqrt() input with -ffast-math
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
rotateright
|
```
#include <math.h>
double foo(double x) {
return pow(sqrt(x), 4.0);
}
```
This can be reduced to x*x:
https://godbolt.org/z/a78oraYoP
It looks like the special case of pow(N, 2.0) is handled, but all higher exponents are missed. If the pow() is converted to powi() in IR, then there could be another transform to divide the exponent in half?
It also doesn't reduce when the sqrt() follows the pow(), so there's probably a missing pow/sqrt canonicalization:
https://godbolt.org/z/4e1Phv8Y7
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