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

[David Green via llvm-commits]

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@@ -3145,12 +3153,16 @@ InstructionCost AArch64TTIImpl::getCFInstrCost(unsigned Opcode,
   return 0;
 }
 
-InstructionCost AArch64TTIImpl::getVectorInstrCostHelper(const Instruction *I,
-                                                         Type *Val,
-                                                         unsigned Index,
-                                                         bool HasRealUse) {
+InstructionCost AArch64TTIImpl::getVectorInstrCostHelper(
+    std::variant<const Instruction *, const unsigned> InstOrOpcode, Type *Val,
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davemgreen wrote:

Can you remove variant? I don't think it is necessary if we always pass the Opcode and then treat the instruction like we do elsewhere as an optional argument.

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