[llvm] [VPlan] First step towards VPlan cost modeling. (PR #92555)

[Florian Hahn via llvm-commits]

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@@ -910,6 +910,10 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
                                  : Instruction::ZExt;
         auto *VPC =
             new VPWidenCastRecipe(Instruction::CastOps(ExtOpcode), A, TruncTy);
+        if (auto *UnderlyingExt = R.getOperand(0)->getUnderlyingValue()) {
+          // UnderlyingExt has distinct return type, used to retain legacy cost.
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fhahn wrote:

Unfortunately yes

https://github.com/llvm/llvm-project/pull/92555