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

[Florian Hahn via llvm-commits]

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@@ -1147,6 +1147,23 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
     return;
   }
 
+  // Look through ExtractLastElement (BuildVector ....).
+  if (match(&R, m_VPInstruction<VPInstruction::ExtractLastElement>(
+                    m_BuildVector()))) {
+    auto *BuildVector = cast<VPInstruction>(R.getOperand(0));
+    Def->replaceAllUsesWith(
+        BuildVector->getOperand(BuildVector->getNumOperands() - 1));
+    return;
+  }
+  // Look through ExtractPenultimateElement (BuildVector ....).
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fhahn wrote:

done thanks

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