[llvm] [AMDGPU] Avoid wmma bank conflict for GFX11 and GFX12 (PR #205530)

[Matt Arsenault via llvm-commits]

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@@ -321,17 +360,27 @@ bool GCNPreRAOptimizationsImpl::run(MachineFunction &MF) {
 
   const bool HasBVHStack = ST.hasBVHDualAndBVH8Insts();
   const bool HasRealTrue16 = ST.useRealTrue16Insts();
+  // On gfx11/gfx12 the operands of a WMMA should be placed on distinct VGPR
+  // banks to avoid an issue-latency penalty.
+  const bool HasWMMABankHint = ST.hasFeature(AMDGPU::FeatureGFX11) ||
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arsenm wrote:

Put predicate in subtarget

https://github.com/llvm/llvm-project/pull/205530