[llvm-branch-commits] [llvm] AMDGPU: Make v2f16/v2bf16 copysign legal (PR #142173)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

Note GloblISel currently just expands G_COPYSIGN, and there is TODO to check the expansion does the right thing to form a BFI, but it does not. We should probably match the custom lowering / directly legal there 

https://github.com/llvm/llvm-project/pull/142173