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

[via llvm-commits]

v01dXYZ wrote:

I discovered something strange with `FEXPR/f16`. It expands it (when looking at the code it seems rather it converts it to a same sized integer type) instead of promoting it. 

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