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

[David Green via llvm-commits]

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@@ -1056,6 +1056,19 @@ InstructionCost TargetTransformInfo::getVectorInstrCost(
   return Cost;
 }
 
+InstructionCost TargetTransformInfo::getVectorInstrCost(
+    unsigned Opcode, Type *Val, TTI::TargetCostKind CostKind, unsigned Index,
+    Value *Scalar,
+    ArrayRef<std::tuple<Value *, User *, int>> ScalarUserAndIdx) const {
+  // FIXME: Assert that Opcode is either InsertElement or ExtractElement.
+  // This is mentioned in the interface description and respected by all
+  // callers, but never asserted upon.
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davemgreen wrote:

I see this is copied but you could add the assert.

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