[llvm] [VPlan] Transform VPFirstOrderRecurrencePHIRecipe into concrete recipes (PR #172009)

[Ramkumar Ramachandra via llvm-commits]

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@@ -3695,6 +3695,34 @@ void VPlanTransforms::convertToConcreteRecipes(VPlan &Plan) {
         continue;
       }
 
+      if (auto *FORPhiR = dyn_cast<VPFirstOrderRecurrencePHIRecipe>(&R)) {
+        VPValue *InitVec = FORPhiR->getStartValue();
+        DebugLoc DL = FORPhiR->getDebugLoc();
+        if (VF.isVector()) {
+          VPBuilder PHBuilder(Plan.getVectorPreheader());
+          VPValue *Poison = Plan.getOrAddLiveIn(
+              PoisonValue::get(TypeInfo.inferScalarType(InitVec)));
+          Type *IdxTy = Type::getInt32Ty(Plan.getContext());
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artagnon wrote:

Hm, insertelement must take i32 type, so this hard-coding is the right thing to do?

https://github.com/llvm/llvm-project/pull/172009