[llvm] [AMDGPU][TTI] Add Target Hook for Instruction Uniformity (getInstructionUniformity) (PR #137639)

[Matt Arsenault via llvm-commits]

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@@ -48,6 +75,11 @@ void llvm::GenericUniformityAnalysisImpl<SSAContext>::pushUsers(
     const Value *V) {
   for (const auto *User : V->users()) {
     if (const auto *UserInstr = dyn_cast<const Instruction>(User)) {
+      if (SpecialUniformIntrinsics.count(UserInstr) &&
+          isAnyOperandUniform(*UserInstr)) {
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arsenm wrote:

This is too specific of a "specially uniform" check. I'd expect this operand validation to be an operation dependent property 

https://github.com/llvm/llvm-project/pull/137639