[llvm] [AMDGPU] selecting v_sat_pk instruction, version 2 (PR #123297)

[Matt Arsenault via llvm-commits]

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@@ -865,6 +865,19 @@ SITargetLowering::SITargetLowering(const TargetMachine &TM,
       setOperationAction({ISD::FMAXIMUM, ISD::FMINIMUM}, MVT::v2f16, Legal);
   }
 
+  // special case for v_sat_pk
+  if (AMDGPU::isGFX9(STI) || AMDGPU::isGFX11(STI) || AMDGPU::isGFX12(STI)) {
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arsenm wrote:

Do not do generation checks, and especially don't do them directly here. This should be a subtarget feature (especially since it was removed in gfx10 and re-added based on this logic?)

https://github.com/llvm/llvm-project/pull/123297