[VPlan] Manage VPWidenIntOrFPInduction debug location via recipe (NFC).

Properly set VPWidenIntOrFpInductionRecipe's debug location in the
recipe and use it, instead of using the debug location of the underlying
IR instruction.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -8439,11 +8439,12 @@ createWidenInductionRecipes(PHINode *Phi, Instruction *PhiOrTrunc,
       vputils::getOrCreateVPValueForSCEVExpr(Plan, IndDesc.getStep(), SE);
   if (auto *TruncI = dyn_cast<TruncInst>(PhiOrTrunc)) {
     return new VPWidenIntOrFpInductionRecipe(Phi, Start, Step, &Plan.getVF(),
-                                             IndDesc, TruncI);
+                                             IndDesc, TruncI,
+                                             TruncI->getDebugLoc());
   }
   assert(isa<PHINode>(PhiOrTrunc) && "must be a phi node here");
   return new VPWidenIntOrFpInductionRecipe(Phi, Start, Step, &Plan.getVF(),
-                                           IndDesc);
+                                           IndDesc, Phi->getDebugLoc());
 }
 
 VPHeaderPHIRecipe *VPRecipeBuilder::tryToOptimizeInductionPHI(

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -2108,17 +2108,18 @@ class VPWidenIntOrFpInductionRecipe : public VPHeaderPHIRecipe {
 
 public:
   VPWidenIntOrFpInductionRecipe(PHINode *IV, VPValue *Start, VPValue *Step,
-                                VPValue *VF, const InductionDescriptor &IndDesc)
-      : VPHeaderPHIRecipe(VPDef::VPWidenIntOrFpInductionSC, IV, Start), IV(IV),
-        Trunc(nullptr), IndDesc(IndDesc) {
+                                VPValue *VF, const InductionDescriptor &IndDesc,
+                                DebugLoc DL)
+      : VPHeaderPHIRecipe(VPDef::VPWidenIntOrFpInductionSC, IV, Start, DL),
+        IV(IV), Trunc(nullptr), IndDesc(IndDesc) {
     addOperand(Step);
     addOperand(VF);
   }
 
   VPWidenIntOrFpInductionRecipe(PHINode *IV, VPValue *Start, VPValue *Step,
                                 VPValue *VF, const InductionDescriptor &IndDesc,
-                                TruncInst *Trunc)
-      : VPHeaderPHIRecipe(VPDef::VPWidenIntOrFpInductionSC, Trunc, Start),
+                                TruncInst *Trunc, DebugLoc DL)
+      : VPHeaderPHIRecipe(VPDef::VPWidenIntOrFpInductionSC, Trunc, Start, DL),
         IV(IV), Trunc(Trunc), IndDesc(IndDesc) {
     addOperand(Step);
     addOperand(VF);
@@ -2127,8 +2128,9 @@ class VPWidenIntOrFpInductionRecipe : public VPHeaderPHIRecipe {
   ~VPWidenIntOrFpInductionRecipe() override = default;
 
   VPWidenIntOrFpInductionRecipe *clone() override {
-    return new VPWidenIntOrFpInductionRecipe(
-        IV, getStartValue(), getStepValue(), getVFValue(), IndDesc, Trunc);
+    return new VPWidenIntOrFpInductionRecipe(IV, getStartValue(),
+                                             getStepValue(), getVFValue(),
+                                             IndDesc, Trunc, getDebugLoc());
   }
 
   VP_CLASSOF_IMPL(VPDef::VPWidenIntOrFpInductionSC)

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -1733,14 +1733,14 @@ void VPWidenIntOrFpInductionRecipe::execute(VPTransformState &State) {
   // factor. The last of those goes into the PHI.
   PHINode *VecInd = PHINode::Create(SteppedStart->getType(), 2, "vec.ind");
   VecInd->insertBefore(State.CFG.PrevBB->getFirstInsertionPt());
-  VecInd->setDebugLoc(EntryVal->getDebugLoc());
+  VecInd->setDebugLoc(getDebugLoc());
   State.set(this, VecInd);
 
   Instruction *LastInduction = cast<Instruction>(
       Builder.CreateBinOp(AddOp, VecInd, SplatVF, "vec.ind.next"));
   if (isa<TruncInst>(EntryVal))
     State.addMetadata(LastInduction, EntryVal);
-  LastInduction->setDebugLoc(EntryVal->getDebugLoc());
+  LastInduction->setDebugLoc(getDebugLoc());
 
   VecInd->addIncoming(SteppedStart, VectorPH);
   // Add induction update using an incorrect block temporarily. The phi node

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

@@ -61,8 +61,8 @@ void VPlanTransforms::VPInstructionsToVPRecipes(
         VPValue *Start = Plan->getOrAddLiveIn(II->getStartValue());
         VPValue *Step =
             vputils::getOrCreateVPValueForSCEVExpr(*Plan, II->getStep(), SE);
-        NewRecipe = new VPWidenIntOrFpInductionRecipe(Phi, Start, Step,
-                                                      &Plan->getVF(), *II);
+        NewRecipe = new VPWidenIntOrFpInductionRecipe(
+            Phi, Start, Step, &Plan->getVF(), *II, Ingredient.getDebugLoc());
       } else {
         assert(isa<VPInstruction>(&Ingredient) &&
                "only VPInstructions expected here");