[llvm] [CostModel][AArch64] Make extractelement, with fmul user, free whenev… (PR #111479)

[David Sherwood via llvm-commits]

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@@ -11739,8 +11750,9 @@ InstructionCost BoUpSLP::getTreeCost(ArrayRef<Value *> VectorizedVals) {
       ExtraCost = TTI->getExtractWithExtendCost(Extend, EU.Scalar->getType(),
                                                 VecTy, EU.Lane);
     } else {
-      ExtraCost = TTI->getVectorInstrCost(Instruction::ExtractElement, VecTy,
-                                          CostKind, EU.Lane);
+      ExtraCost = TTI->getVectorInstrCost(
+          Instruction::ExtractElement, VecTy, CostKind, EU.Lane, nullptr,
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david-arm wrote:

To be honest I'm a bit confused by the interface here. It seems like the only use case for this function is when the Op0 and Op1 arguments are both nullptr. So why not just remove these two arguments from the interface?

https://github.com/llvm/llvm-project/pull/111479