[libc-commits] [libc] [libc][math] Implement double precision cos correctly rounded to all rounding modes. (PR #96591)

[via libc-commits]

zimmermann6 wrote:

is that ready for review? I get several failures with the core-math test suite:
```
Running worst cases check in --rndn mode...
FAIL x=0x1.00a33764a0a83p-7 ref=0x1.fffbfae5fd5b9p-1 z=0x1.fffbfae5fd5b8p-1
Running worst cases check in --rndz mode...
FAIL x=0x1.fe81868fc47fep+1 ref=-0x1.532a58337e7c7p-1 z=-0x1.532a58337e7c6p-1
Running worst cases check in --rndu mode...
FAIL x=0x1.0da8cc189b47dp-10 ref=0x1.ffffee3f3d56cp-1 z=0x1.ffffee3f3d56dp-1
Running worst cases check in --rndd mode...
FAIL x=0x1.da1838053b866p+5 ref=-0x1.d1b955a0137fep-1 z=-0x1.d1b955a0137ffp-1
```

https://github.com/llvm/llvm-project/pull/96591