[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:

I do not see a way to tell it is incompatible in the first place. OK, wave32 implies it supports wave32. How does it turn wave32 automatically? How does it tell that wave64 is incompatible with wave32?

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