[libc-commits] [libc] [libc][C23][math] Implement cospif function correctly rounded for all rounding modes (PR #97464)

[via libc-commits]

zimmermann6 wrote:

I get a failure for rounding down:
```
Running exhaustive check in --rndn mode...
all ok
Running exhaustive check in --rndz mode...
all ok
Running exhaustive check in --rndu mode...
all ok
Running exhaustive check in --rndd mode...
FAIL x=0x1.7408p+12 ref=0x0p+0 y=-0x0p+0
```

https://github.com/llvm/llvm-project/pull/97464