[llvm] [LV] Use wide lane masks as the canonical form when tail-folding & interleaving (PR #209484)

[David Sherwood via llvm-commits]

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@@ -1104,6 +1112,17 @@ Value *VPInstruction::generate(VPTransformState &State) {
 
     return Result;
   }
+  case VPInstruction::ExtractVectorForPart: {
+    Value *Src = State.get(getOperand(0));
+    Type *DstTy = VectorType::get(getScalarType(), State.VF);
+    unsigned Part = cast<VPConstantInt>(getOperand(1))->getZExtValue();
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david-arm wrote:

nit: Perhaps use `uint64_t` to match the return type of `getZExtValue`?

https://github.com/llvm/llvm-project/pull/209484