[libc-commits] [libc] [llvm] [libc][math][c23] Improve rsqrtf16() function (PR #160639)

[Anton Shepelev via libc-commits]

amemov wrote:

Confirmed that when this path is taken, that MPFR results are green.

In the meantime will try to run it through Google Benchmark to see how far the approximation is from x86 `sqrt` instruction. I believe last time it was quite far (which is expected), but still

https://github.com/llvm/llvm-project/pull/160639