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

[Florian Hahn via llvm-commits]

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@@ -261,6 +261,14 @@ Value *VPTransformState::get(const VPValue *Def, const VPLane &Lane) {
     return Data.VPV2Scalars[Def][0];
   }
 
+  // Look through BuildVector to avoid redundant extracts.
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fhahn wrote:

Yep without the fold we would have additional insert/extracts for uses inside replicate regions, with corresponding test changes.

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