[llvm] [VPlan] Add VPInstruction to unpack vector values to scalars. (PR #155670)

[Florian Hahn via llvm-commits]

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@@ -548,7 +563,8 @@ void VPlanTransforms::replicateByVF(VPlan &Plan, ElementCount VF) {
           (isa<VPReplicateRecipe>(&R) &&
            cast<VPReplicateRecipe>(&R)->isSingleScalar()) ||
           (isa<VPInstruction>(&R) &&
-           !cast<VPInstruction>(&R)->doesGeneratePerAllLanes()))
+           !cast<VPInstruction>(&R)->doesGeneratePerAllLanes() &&
+           cast<VPInstruction>(&R)->getOpcode() != VPInstruction::Unpack))
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fhahn wrote:

It may not generate for all lanes at the moment, if only its first lane is used and all cases need to be handled by unrolling at the moment.

https://github.com/llvm/llvm-project/pull/155670