[llvm] [VPlan] Unroll VPReplicateRecipe by VF. (PR #142433)

[via llvm-commits]

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@@ -493,6 +493,9 @@ Value *VPInstruction::generate(VPTransformState &State) {
   }
   case Instruction::ExtractElement: {
     assert(State.VF.isVector() && "Only extract elements from vectors");
+    return State.get(getOperand(0),
+                     VPLane(cast<ConstantInt>(getOperand(1)->getLiveInIRValue())
+                                ->getZExtValue()));
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ayalz wrote:

If second operand of ExtractElement must be a (small, less than VF) compile-time constant, would it be better held in VPIRFlags, given that other flags are unneeded?

https://github.com/llvm/llvm-project/pull/142433