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

[Pankaj Dwivedi 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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PankajDwivedi-25 wrote:

Yeah, I think as @jayfoad suggested. Probably I should let this be decided by the target. The only thing is that it would be costlier, and the decision of uniformity will be taken outside of UA, which I am not sure is acceptable?

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