[libc-commits] [libc] [llvm] [libc][math] Add isnanf128 (PR #199206)

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lntue wrote:

> > LGTM with a small nit + Have you tried building with gcc?
> > CC @lntue
> 
> Yes, I did build with a newer gcc, but it seems that for older versions of gcc, constexpr on `fputil::FPBits<float128>` isn't supported. Should I revert this back to `LIBC_CONSTEXPR`?

Yes, you should revert it back to `LIBC_CONSTEXPR`.

https://github.com/llvm/llvm-project/pull/199206