[llvm] [X86][LegalizeDAG] FPOWI: promote f16 operand (PR #105775)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> I have a vocabulary question: in the strict terminology of Legalisation, _expand_ means breaking up a complex operation using smaller types, should I rather think of it as an Instruction Expand ?

It depends on what legalization stage you're dealing with - expand to legal type / scalarize / split into simpler instructions etc.

I've added more tests to fp16-libcalls.ll - please can you rebase?

https://github.com/llvm/llvm-project/pull/105775