[libc-commits] [libc] [libc][math] implement `signbit` and math macro unit tests (PR #97791)

[Petr Hosek via libc-commits]

petrhosek wrote:

I don't think the `isnan*` tests should live in `test/include`, they should live in `test/sec/math` to mirror implementation in `src/math` just like we did for all other math functions. The same also applies `isinf*` to `isfinite*`. Right now the tests don't match the implementation because `isinfl`, `isinff`, `isfinitel` and `isfinitef` don't exist at all.

I think this change should have really just added tests for `signbit` just like the commit message says and `isinf*` and `isfinite*` in should have been covered in separate changes correctly.

https://github.com/llvm/llvm-project/pull/97791