[llvm] [AMDGPU] Remove wavefrontsize feature from GFX10+ (PR #98400)

[Stanislav Mekhanoshin via llvm-commits]

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@@ -105,6 +105,14 @@ GCNSubtarget::initializeSubtargetDependencies(const Triple &TT,
                                         : AMDGPUSubtarget::SOUTHERN_ISLANDS;
   }
 
+  if (!hasFeature(AMDGPU::FeatureWavefrontSize32) &&
+      !hasFeature(AMDGPU::FeatureWavefrontSize64)) {
+    if (getGeneration() >= AMDGPUSubtarget::GFX10)
+      ToggleFeature(AMDGPU::FeatureWavefrontSize32);
+    else
+      ToggleFeature(AMDGPU::FeatureWavefrontSize64);
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rampitec wrote:

IMHO to do what you want features must be:

1) Organized in groups.
2) We need to tell features in group are mutually exclusive.
3) There shall be a way to tell this one is the default.

None of that exists.

https://github.com/llvm/llvm-project/pull/98400