[llvm] [CostModel] getInstructionCost - improve estimation of costs for length changing shuffles (PR #84156)

[Alexey Bataev via llvm-commits]

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@@ -1326,28 +1326,29 @@ class TargetTransformInfoImplCRTPBase : public TargetTransformInfoImplBase {
       auto *VecSrcTy = cast<VectorType>(Operands[0]->getType());
       int NumSubElts, SubIndex;
 
+      // TODO: move more of this inside improveShuffleKindFromMask.
       if (Shuffle->changesLength()) {
+        ArrayRef<int> Mask = Shuffle->getShuffleMask();
+
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alexey-bataev wrote:

Better to make in a separate NFC patch

https://github.com/llvm/llvm-project/pull/84156