[llvm] [LV]: Teach LV to recursively (de)interleave. (PR #89018)

[Mel Chen via llvm-commits]

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@@ -2916,22 +2921,49 @@ void VPInterleaveRecipe::execute(VPTransformState &State) {
     ArrayRef<VPValue *> VPDefs = definedValues();
     const DataLayout &DL = State.CFG.PrevBB->getDataLayout();
     if (VecTy->isScalableTy()) {
-      assert(InterleaveFactor == 2 &&
+      assert(isPowerOf2_32(InterleaveFactor) &&
              "Unsupported deinterleave factor for scalable vectors");
 
-        // Scalable vectors cannot use arbitrary shufflevectors (only splats),
-        // so must use intrinsics to deinterleave.
-      Value *DI = State.Builder.CreateIntrinsic(
-          Intrinsic::vector_deinterleave2, VecTy, NewLoad,
-          /*FMFSource=*/nullptr, "strided.vec");
-      unsigned J = 0;
-      for (unsigned I = 0; I < InterleaveFactor; ++I) {
-        Instruction *Member = Group->getMember(I);
+      // Scalable vectors cannot use arbitrary shufflevectors (only splats),
+      // so must use intrinsics to deinterleave.
+
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Mel-Chen wrote:

Remove this blank line.

https://github.com/llvm/llvm-project/pull/89018