[llvm] [SLP][REVEC] Make ShuffleCostEstimator and ShuffleInstructionBuilder can vectorize vector instructions. (PR #99606)

[Han-Kuan Chen via llvm-commits]

================
@@ -8800,13 +8815,17 @@ class BoUpSLP::ShuffleCostEstimator : public BaseShuffleAnalysis {
       // Shuffle single vector.
       ExtraCost += GetValueMinBWAffectedCost(V1);
       CommonVF = cast<FixedVectorType>(V1->getType())->getNumElements();
+      if (auto *VecTy = dyn_cast<FixedVectorType>(ScalarTy))
+        CommonVF /= VecTy->getNumElements();
       assert(
           all_of(Mask,
                  [=](int Idx) { return Idx < static_cast<int>(CommonVF); }) &&
           "All elements in mask must be less than CommonVF.");
     } else if (V1 && !V2) {
       // Shuffle vector and tree node.
       unsigned VF = cast<FixedVectorType>(V1->getType())->getNumElements();
+      if (auto *VecTy = dyn_cast<FixedVectorType>(ScalarTy))
+        VF /= VecTy->getNumElements();
----------------
HanKuanChen wrote:

Add assertion in `GetVF`.

https://github.com/llvm/llvm-project/pull/99606