[llvm] [AMDGPU][GFX11] Do not rewrite V_FMA/FMAC_* to V_FMAAK_F16_t16 on operand legalization. (PR #66202)

[Joe Nash via llvm-commits]

Sisyph wrote:

Is it true that this function FoldImmediate is only called pre-RA? It seems from my cursory check just now that is the case. If so, then I agree that bailing out on FMAAK_F16_t16 and FMAMK_F16_t16 is correct. If not, then I think we would want to check the assigned registers similar to what is done in SIShrinkInstructions::shouldShrinkTrue16.


https://github.com/llvm/llvm-project/pull/66202