[llvm] [AArch64][CostModel] Consider the cost of const vector (PR #117539)

[Alexey Bataev via llvm-commits]

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@@ -13479,6 +13501,56 @@ InstructionCost BoUpSLP::getGatherCost(ArrayRef<Value *> VL, bool ForPoisonSrc,
           Cost += TTI->getShuffleCost(
               TTI::SK_InsertSubvector, VecTy, std::nullopt, CostKind,
               I * ScalarTyNumElements, cast<FixedVectorType>(ScalarTy));
+    } else if (allConstant(VL)) {
+      auto IsAllowedScalarTy = [&](const Type *T) {
+        return T->isFloatTy() || T->isDoubleTy() || T->isIntegerTy();
+      };
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alexey-bataev wrote:

It should just call TTI getConstantMaterializationCost, nothing else

https://github.com/llvm/llvm-project/pull/117539