[llvm] AMDGPU][True16][CodeGen] FP_Round f64 to f16 in true16 (PR #128911)

[Jay Foad via llvm-commits]

jayfoad wrote:

> I don't understand this change. You shouldn't have to make any of this code conditional on true16. Are you just avoiding the FP_TO_FP16? We can and should do that independently of true16

I thought that FP_TO_FP16 should only be used on targets that put fp16 values in 32-bit registers, which AMDGPU traditionally does but True16 does not.

https://github.com/llvm/llvm-project/pull/128911