[libc-commits] [libc] [libc] Provide isnan, isnanf and isnanl functions (PR #96008)

[Nick Desaulniers via libc-commits]

https://github.com/nickdesaulniers requested changes to this pull request.

`isnanf` and `isnanl` LGTM.

But I think we may need to be more careful here with `isnan`.

`isnan` is generally a macro or a function?  That needs to be explored more carefully I think.

cc @enh-google @frobtech for folks that might understand this problem better.

https://github.com/llvm/llvm-project/pull/96008