[libc-commits] [libc] [libc][math][c23] Add exp2m1f16 C23 math function (PR #105690)

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overmighty wrote:

> Why are there any volatile accesses? There shouldn't be any z

Some of them are from https://github.com/llvm/llvm-project/blob/main/libc/src/__support/FPUtil/rounding_mode.h#L67. I'm not sure about the others.

> But still, this should just emit llvm.exp2

I don't think any higher math function implementation in LLVM libc emits the respective LLVM intrinsic currently.

https://github.com/llvm/llvm-project/pull/105690