[LV] Support widened induction variables in epilogue vectorization.

[fhahn]

Summary

Code generation now uses the start VPValue of induction recipes.

This makes it possible to adjust the start value of the epilogue
vector loop to use the 'resume' value of the main vector loop.

Fixes #59459.

[fhahn]

rebase

[fhahn]

rebased now that all required dependencies landed a while ago.

[bmahjour]

Instead of changing the generic interface for skeleton creation, how about adding a field to hold the resume value inside EpilogueVectorizerEpilogueLoop? Then inside executePlan() we would do something like this to update the induction widening recipes:

EpilogueVectorizerEpilogueLoop *EILV = dyn_cast<EpilogueVectorizerEpilogueLoop>(ILV);
if (EILV) {
  Value *IndStart = EILV->getResumeValue();
  assert(IndStart && "Expected valid resume value");
  ...
}

Also don't we need to store some sort of a map to be able to handle loops with multiple widened induction vars (with potentially different resume values)? I'm thinking of a case like this:

void foo(int * restrict A, int N) {
  int i, j, k;
  for (i = 0, j = 1, k = 2; i < N; i++, j++, k++)
    A[i] = j + k;
}

[bmahjour]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

7665

Don't we need to make sure that it is an "external definition" before treating it as such?

[venkataramanan.kumar.llvm]

Hi Florian,
--Snip--
void foo(double * restrict a, double * restrict b, int N) {
int k=0;
for(int i = 0 , k =2; i < N; ++i, ++k)

a[i] = sin(i)+k;

}
--Snip--

I am able to see the resume value for induction "i" updated properly now after the patch .

--Snip--
33: ; preds = %8, %28

%34 = phi i64 [ %11, %28 ], [ 0, %8 ]
%35 = and i64 %6, 4294967294
%36 = trunc i64 %35 to i32
%37 = add i32 %36, 2
%38 = insertelement <2 x i64> poison, i64 %34, i32 0
%39 = shufflevector <2 x i64> %38, <2 x i64> poison, <2 x i32> zeroinitializer
%40 = or <2 x i64> %39, <i64 0, i64 1>
%41 = trunc i64 %34 to i32
%42 = insertelement <2 x i32> poison, i32 %41, i32 0
%43 = shufflevector <2 x i32> %42, <2 x i32> poison, <2 x i32> zeroinitializer
%44 = or <2 x i32> %43, <i32 0, i32 1>
br label %45

45: ; preds = %45, %33

%46 = phi i64 [ %34, %33 ], [ %55, %45 ]
%47 = phi <2 x i64> [ %40, %33 ], [ %56, %45 ]   <== updated
%48 = phi <2 x i32> [ %44, %33 ], [ %57, %45 ] <== updated

--Snip--

I was thinking if we could reuse the incremented widened induction results from the main vector loop. But this seems cleaner and simpler code .

[venkataramanan.kumar.llvm]

Hi Florian,

This patch breaks one assert when building compiler-rt. However I noticed that in my work space I lowered the epilog generation thresholds to 8 so got this assert.

Here is the general reproducer.

---Snip winden-ce.cpp ---
unsigned short int * MemToShadow(unsigned int x);

void Add( unsigned int begin,unsigned int end, unsigned int cfi_check) {

// Don't fill anything below cfi_check. We can not represent those addresses
// in the shadow, and must make sure at codegen to place all valid call
// targets above cfi_check.
//begin = Max(begin, cfi_check);
unsigned short int *s = MemToShadow(begin);
unsigned short int *s_end = MemToShadow(end - 1) + 1;
unsigned short int  sv = ((begin - cfi_check)) + 1;
for (; s < s_end; s++, sv++)
  *s = sv;

}
---Snip--

clang++ -O3 winden-ce.cpp -S -emit-llvm -mllvm -epilogue-vectorization-minimum-VF=8

LoopVectorize.cpp:2535: virtual llvm::Value* llvm::InnerLoopVectorizer::getStepVector(llvm::Value*, int, llvm::Value*, llvm::Instruction::BinaryOps): Assertion `Step->getType() == STy && "Step has wrong type"' failed.

I noticed Main loop Vector splat created in the preheader is with i16 type (unsigned short *)
%.splat = shufflevector <8 x i16> %.splatinsert, <8 x i16> poison, <8 x i32> zeroinitializer

whereas Epilog loop creates vector splat with i32 type.
%.splat31 = shufflevector <4 x i64> %.splatinsert30, <4 x i64> poison, <4 x i32> zeroinitializer

[fhahn]

Thanks for taking a look and giving it a try! I now remember what was still missing, handling noprimiary IV cases. I'll work to update the patch, but I think it might need a few more patches to bring other parts of the infrastructure up to speedd.

[fhahn]

I reworked the patch to use a createInductionResumeValue to create the required resume values as needed.

[fhahn]

Ping :)

[rengolin]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

3197–3198

unused?

7920

A comment here for the semantics of this would be nice

10499–10501

80 columns?

10532

This code is hard to follow, perhaps a comment?

[venkataramanan.kumar.llvm]

Hi

I tried to build the patch on top of the latest trunk and facing this issue.

/home/amd/venkat/aocc-work/mirror/llvm-project/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:10505:24: error: ‘class llvm::VPWidenPointerInductionRecipe’ has no member named ‘getInductionDescriptor’
10505 | ID = &Ind->getInductionDescriptor();

Any other patch I am missing to add other than this one and its parent ?

[fhahn]

Thanks for taking a look!

Comments should be addressed, also moved getInductionDescriptor definition from separate patch to this one.

[fhahn]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

3197–3198

This has been removed in the earlier change that did the refactoring, some for the return type fix.

7920

Added a comment, thanks.

10499–10501

Thanks, formatting should be fixed.

10532

Thanks, added a comment.

[Ayal]

Good improvement, adding various nits.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

7898–7899

nit: and reduction?

7924

nit: none_of?

10502–10504

nit: can cast R into VPHeaderPHIRecipe and have it provide SetStartValue() to be used by all below.

10506–10529

early continue? Or have all cases issue a common R.setOperand(0, StartVal)?

10543

else it's an FOR and continue - they resume ok?

Rather than check and continue, better assert (IndPhi && "...") for inductions - whose start/resume value must always be fixed?

10548

Compare with how other "live-ins" are handled by creating empty VPValues registered with VPlan to be filled with Values created during VPlan::prepareToExecute(). Are these live-ins better handled here, inside LoopVectorizePass::processLoop() which is already overburdened with 400 LOC? Can leave behind a TODO...

llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll

173

nit: why this redundant label change, here and additional multiple instances below?

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization-limitations.ll

11

Adding assertions to show we can vectorize main loop but not epilog?

38

worth retaining f3 testcase to demonstrate that widened/truncated inductions do get epilog vectorized, or becomes redundant?

[fhahn]

Address latest comments, thanks!

[fhahn]

Move test with truncated IV to optimal-epilog-vectorization.ll

[fhahn]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

7898–7899

Added, thanks!

7924

Thanks, I wasn't aware of none_of. Updated!

10502–10504

Added the helper and use it below.

10506–10529

Restructured the code to have a single setStartValue below.

10543

The only allowed recipe to skip should be the canonical IV. Added an assert. If we have FORs here it would be a mis-compile.

10548

Added a todo, thanks! Not sure yet how to best move the code, as it requires access to ILV and prepareToExecute is defined in VPlan.cpp, so doesn't really have access to it at the moment unfortunately.

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization-limitations.ll

38

Sounds good, I moved it to optimal-epilog-vectorization.ll

[Ayal]

Thanks for accommodating, this looks good to me, with a couple of final nits.
@rengolin, @bmahjour, @venkataramanan.kumar.llvm - any further comments or ok with you to accept?

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

10515

nit: may introduce getPHINode() here as well; and potentially a pure virtual VPWidenInductionRecipe base class to cover the common interface of it and getInductionDescriptor().

10522

nit: } else { ?

llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll

173

ok, iter.check is an indicator that createEpilogueVectorizedLoopSkeleton() kicked in, sigh.

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization-limitations.ll

11

Clarify why assertions were added here now?

[rengolin]

All my comments addressed, if other people are happy, I'm also happy. Thanks!

[venkataramanan.kumar.llvm]

Just one question otherwise patch looks good to me.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

10529

Just a question here we are creating induction resume values two times for the main vector loop. One here while setting up resume value for epilog vector loop. The second one while setting up resume value for the scalar loop. is it possible to reuse already created one?

If implementing the reuse is not worth the effort than creating a new one please ignore my comment.

[fhahn]

Rebase on top of additional tests in 26c8632f22a5f49f57410607476c874a45daf3a5 and also update comment in EpilogueVectorizerMainLoop::createEpilogueVectorizedLoopSkeleton.

[fhahn]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

10529

Just a question here we are creating induction resume values two times for the main vector loop. One here while setting up resume value for epilog vector loop. The second one while setting up resume value for the scalar loop. is it possible to reuse already created one?

I think in general, the resume values could be different, e.g the edge main-vector-loop-successor -> scalar loop it would be based on (N - main vector TC), the edge epilogue-vector-loop-successor it would be based on (N - main vector TC - epilogue vector TC).

Is it possible that you were looking at the resume values in @test_widen_ptr_induction? I think those are a bit misleading, the resume values are the same as the epilogue vector loop never executes AFAICT. I added a few more interesting variants with runtime trip counts (e.g. @test_widen_induction).

[venkataramanan.kumar.llvm]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

10529

I am referring to induction end value computation in "InnerLoopVectorizer::createInductionResumeValue". It is called at this line (N - main vector TC).

Then again in CreateInductionResumeValues({VecEpilogueIterationCountCheck, EPI.VectorTripCount} /* AdditionalBypass */). in "EpilogueVectorizerEpilogueLoop::createEpilogueVectorizedLoopSkeleton". We create again at Additional bypass block (N - main vector TC)

Example:

int a[10000],n;
void fn() {
for (int i=2;i<n;i++) {

a[i] = a[i] + i;

}
}

---Snip--
vector.ph: ; preds = %vector.main.loop.iter.check

%n.vec = and i64 %1, -64
**%ind.end = or i64 %n.vec, 2**

vec.epilog.iter.check: ; preds = %middle.block
%ind.end20 = or i64 %n.vec, 2
---Snip--

But I think creating two times should be Ok.

[fhahn]

Rebased on top of additional test (518bccfd6e8b3aa3)

[fhahn]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

10529

Oh right, thanks for sharing the case. I added a similar test case in 518bccfd6e8b.

I don't think it is worth caching those values for now, as it would require additional state which might add extra complexity and the extra instructions should be cleaned up by later passes. Going forward it might make sense to use SCEVExpander to create the end values, which would mean we would get re-use for free.

[fhahn]

Ping :)

[fhahn]

Ping

[fhahn]

Ping :)

[fhahn]

Rebase & ping. This also fixes another issue: https://github.com/llvm/llvm-project/issues/59459

[Ayal]

Ship it!
This looks even better with the added tests, and the last issue @venkataramanan.kumar.llvm raised regarding replicated end values seems acceptable.
SCEV expanding the end values is worth a TODO? Added a couple of thoughts that can be addressed separately.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

7734

Should this caching of trip count be taken are of by executePlan() prior to creating the skeleton, as raised in optimizeForVFAndUF()? (Independent of this patch.)

10522

Or early continue, along with above nit:

if (isa<VPCanonicalIVPHIRecipe>(&R))
  continue;
if (auto *ReductionPhi = dyn_cast<VPReductionPHIRecipe>(&R))
  ResumeV = MainILV.getReductionResumeValue(ReductionPhi->getRecurrenceDescriptor());
else {
  auto *Ind = cast<VPWidenInductionRecipe>(&R);
  PHINode *IndPhi = Ind->getPHINode();
  const InductionDescriptor *ID = &Ind->getInductionDescriptor();
  ResumeV = MainILV.createInductionResumeValue(IndPhi, *ID, {EPI.MainLoopIterationCountCheck});
}

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization-limitations.ll

11

assertions gone...

[fhahn]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

7734

Yes that would reduce duplication. Done in 7d8528dbf290

10522

Added the early exit at the top of the loop, thanks!

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization-limitations.ll

11

I think the REQUIRES: asserts is needed because the test only checks debug output.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

PHINode *InnerLoopVectorizer::createInductionResumeValue(
 
   if (AdditionalBypass.first)
     BCResumeVal->setIncomingValueForBlock(AdditionalBypass.first,
                                           EndValueFromAdditionalBypass);
   return BCResumeVal;
 }
 
 void InnerLoopVectorizer::createInductionResumeValues(
     std::pair<BasicBlock *, Value *> AdditionalBypass) {
   assert(((AdditionalBypass.first && AdditionalBypass.second) ||
           (!AdditionalBypass.first && !AdditionalBypass.second)) &&
          "Inconsistent information about additional bypass.");
   // We are going to resume the execution of the scalar loop.
   // Go over all of the induction variables that we found and fix the
   // PHIs that are left in the scalar version of the loop.
   // The starting values of PHI nodes depend on the counter of the last
   // iteration in the vectorized loop.
   // If we come from a bypass edge then we need to start from the original
for (User *U : PostInc->users())
       if (!L.contains(cast<Instruction>(U)))
         return false;
     // Look for uses of penultimate value of the induction.
     for (User *U : Entry.first->users())
       if (!L.contains(cast<Instruction>(U)))
         return false;
   }
 
-  // Induction variables that are widened require special handling that is
-  // currently not supported.
-  if (any_of(Legal->getInductionVars(), [&](auto &Entry) {
-        return !(this->isScalarAfterVectorization(Entry.first, VF) ||
-                 this->isProfitableToScalarize(Entry.first, VF));
-      }))
-    return false;
-
   // Epilogue vectorization code has not been auditted to ensure it handles
   // non-latch exits properly.  It may be fine, but it needs auditted and
   // tested.
   if (L.getExitingBlock() != L.getLoopLatch())
     return false;
 
   return true;
 }
void LoopVectorizationPlanner::executePlan(ElementCount BestVF, unsigned BestUF,
   ILV.printDebugTracesAtStart();
 
   //===------------------------------------------------===//
   //
   // Notice: any optimization or new instruction that go
   // into the code below should also be implemented in
   // the cost-model.
   //
   //===------------------------------------------------===//
 
   // 2. Copy and widen instructions from the old loop into the new loop.
   BestVPlan.prepareToExecute(ILV.getOrCreateTripCount(nullptr),
                              ILV.getOrCreateVectorTripCount(nullptr),
                              CanonicalIVStartValue, State,
                              IsEpilogueVectorization);
 
   BestVPlan.execute(&State);

 std::pair<BasicBlock *, Value *>
 EpilogueVectorizerMainLoop::createEpilogueVectorizedLoopSkeleton() {
   // Workaround!  Compute the trip count of the original loop and cache it
   // before we start modifying the CFG.  This code has a systemic problem
   // wherein it tries to run analysis over partially constructed IR; this is
   // wrong, and not simply for SCEV.  The trip count of the original loop
   // simply happens to be prone to hitting this in practice.  In theory, we
   // can hit the same issue for any SCEV, or ValueTracking query done during
   // mutation.  See PR49900.
   getOrCreateTripCount(OrigLoop->getLoopPreheader());
   createVectorLoopSkeleton("");
 
   // Generate the code to check the minimum iteration count of the vector
   // epilogue (see below).
   EPI.EpilogueIterationCountCheck =
       emitIterationCountCheck(LoopScalarPreHeader, true);
   EPI.EpilogueIterationCountCheck->setName("iter.check");
EpilogueVectorizerMainLoop::createEpilogueVectorizedLoopSkeleton() {
   // the epilogue.
   EPI.MainLoopIterationCountCheck =
       emitIterationCountCheck(LoopScalarPreHeader, false);
 
   // Generate the induction variable.
   EPI.VectorTripCount = getOrCreateVectorTripCount(LoopVectorPreHeader);
 
   // Skip induction resume value creation here because they will be created in
-  // the second pass. If we created them here, they wouldn't be used anyway,
-  // because the vplan in the second pass still contains the inductions from the
-  // original loop.
+  // the second pass for the scalar loop. The induction resume values for the
+  // inductions in the epilogue loop are created before executing the plan for
+  // the epilogue loop.
 
   return {completeLoopSkeleton(), nullptr};
 }
 
 void EpilogueVectorizerMainLoop::printDebugTracesAtStart() {
   LLVM_DEBUG({
     dbgs() << "Create Skeleton for epilogue vectorized loop (first pass)\n"
            << "Main Loop VF:" << EPI.MainLoopVF
EpilogueVectorizerEpilogueLoop::createEpilogueVectorizedLoopSkeleton() {
   DT->changeImmediateDominator(LoopScalarPreHeader,
                                EPI.EpilogueIterationCountCheck);
   if (!Cost->requiresScalarEpilogue(EPI.EpilogueVF))
     // If there is an epilogue which must run, there's no edge from the
     // middle block to exit blocks  and thus no need to update the immediate
     // dominator of the exit blocks.
     DT->changeImmediateDominator(LoopExitBlock,
                                  EPI.EpilogueIterationCountCheck);
 
-  // Keep track of bypass blocks, as they feed start values to the induction
-  // phis in the scalar loop preheader.
+  // Keep track of bypass blocks, as they feed start values to the induction and
+  // reduction phis in the scalar loop preheader.
   if (EPI.SCEVSafetyCheck)
     LoopBypassBlocks.push_back(EPI.SCEVSafetyCheck);
   if (EPI.MemSafetyCheck)
     LoopBypassBlocks.push_back(EPI.MemSafetyCheck);
   LoopBypassBlocks.push_back(EPI.EpilogueIterationCountCheck);
 
-  // The vec.epilog.iter.check block may contain Phi nodes from reductions which
-  // merge control-flow from the latch block and the middle block. Update the
-  // incoming values here and move the Phi into the preheader.
+  // The vec.epilog.iter.check block may contain Phi nodes from inductions or
+  // reductions which merge control-flow from the latch block and the middle
+  // block. Update the incoming values here and move the Phi into the preheader.
   SmallVector<PHINode *, 4> PhisInBlock;
   for (PHINode &Phi : VecEpilogueIterationCountCheck->phis())
     PhisInBlock.push_back(&Phi);
 
   for (PHINode *Phi : PhisInBlock) {
+    Phi->moveBefore(LoopVectorPreHeader->getFirstNonPHI());
     Phi->replaceIncomingBlockWith(
         VecEpilogueIterationCountCheck->getSinglePredecessor(),
         VecEpilogueIterationCountCheck);
+
+    // If the phi doesn't have an incoming value from the
+    // EpilogueIterationCountCheck, we are done. Otherwise remove the incoming
+    // value and also those from other check blocks. This is needed for
+    // reduction phis only.
+    if (none_of(Phi->blocks(), [&](BasicBlock *IncB) {
+          return EPI.EpilogueIterationCountCheck == IncB;
+        }))
+      continue;
     Phi->removeIncomingValue(EPI.EpilogueIterationCountCheck);
     if (EPI.SCEVSafetyCheck)
       Phi->removeIncomingValue(EPI.SCEVSafetyCheck);
     if (EPI.MemSafetyCheck)
       Phi->removeIncomingValue(EPI.MemSafetyCheck);
-    Phi->moveBefore(LoopVectorPreHeader->getFirstNonPHI());
   }
 
   // Generate a resume induction for the vector epilogue and put it in the
   // vector epilogue preheader
   Type *IdxTy = Legal->getWidestInductionType();
   PHINode *EPResumeVal = PHINode::Create(IdxTy, 2, "vec.epilog.resume.val",
                                          LoopVectorPreHeader->getFirstNonPHI());
   EPResumeVal->addIncoming(EPI.VectorTripCount, VecEpilogueIterationCountCheck);
if (!VectorizeLoop) {
                                                  ORE, EPI, &LVL, &CM, BFI, PSI,
                                                  Checks);
 
         VPlan &BestEpiPlan = LVP.getBestPlanFor(EPI.EpilogueVF);
         VPRegionBlock *VectorLoop = BestEpiPlan.getVectorLoopRegion();
         VPBasicBlock *Header = VectorLoop->getEntryBasicBlock();
         Header->setName("vec.epilog.vector.body");
 
-        // Ensure that the start values for any VPReductionPHIRecipes are
-        // updated before vectorising the epilogue loop.
+        // Ensure that the start values for any VPWidenIntOrFpInductionRecipe,
+        // VPWidenPointerInductionRecipe and VPReductionPHIRecipes are updated
+        // before vectorizing the epilogue loop.
         for (VPRecipeBase &R : Header->phis()) {
+          Value *ResumeV = nullptr;
+          // TODO: Move setting of resume values to prepareToExecute.
           if (auto *ReductionPhi = dyn_cast<VPReductionPHIRecipe>(&R)) {
-            Value *Resume = MainILV.getReductionResumeValue(
+            ResumeV = MainILV.getReductionResumeValue(
                 ReductionPhi->getRecurrenceDescriptor());
-            assert(Resume && "Must have a resume value.");
-            VPValue *StartVal = BestEpiPlan.getOrAddExternalDef(Resume);
-            ReductionPhi->setOperand(0, StartVal);
+          } else {
+            // Create induction resume values for both widened pointer and
+            // integer/fp inductions and update the start value of the induction
+            // recipes to use the resume value.
+            PHINode *IndPhi = nullptr;
+            const InductionDescriptor *ID;
+            if (auto *Ind = dyn_cast<VPWidenPointerInductionRecipe>(&R)) {
+              IndPhi = cast<PHINode>(Ind->getUnderlyingValue());
+              ID = &Ind->getInductionDescriptor();
+            } else if (auto *Ind =
+                           dyn_cast<VPWidenIntOrFpInductionRecipe>(&R)) {
+              IndPhi = Ind->getPHINode();
+              ID = &Ind->getInductionDescriptor();
+            }
+            if (!IndPhi) {
+              assert(isa<VPCanonicalIVPHIRecipe>(&R) &&
+                     "Trying to skip unexpected recipe.");
+              continue;
             }
+
+            ResumeV = MainILV.createInductionResumeValue(
+                IndPhi, *ID, {EPI.MainLoopIterationCountCheck});
+          }
+          assert(ResumeV && "Must have a resume value");
+          VPValue *StartVal = BestEpiPlan.getOrAddExternalDef(ResumeV);
+          cast<VPHeaderPHIRecipe>(&R)->setStartValue(StartVal);
         }
 
         LVP.executePlan(EPI.EpilogueVF, EPI.EpilogueUF, BestEpiPlan, EpilogILV,
                         DT, true);
         ++LoopsEpilogueVectorized;
 
         if (!MainILV.areSafetyChecksAdded())
           DisableRuntimeUnroll = true;
       } else {
         InnerLoopVectorizer LB(L, PSE, LI, DT, TLI, TTI, AC, ORE, VF.Width,
                                VF.MinProfitableTripCount, IC, &LVL, &CM, BFI,
                                PSI, Checks);
 
         VPlan &BestPlan = LVP.getBestPlanFor(VF.Width);
         LVP.executePlan(VF.Width, IC, BestPlan, LB, DT, false);
         ++LoopsVectorized;
 
         // Add metadata to disable runtime unrolling a scalar loop when there
         // are no runtime checks about strides and memory. A scalar loop that is
         // rarely used is not worth unrolling.
         if (!LB.areSafetyChecksAdded())
           DisableRuntimeUnroll = true;
       }

llvm/lib/Transforms/Vectorize/VPlan.h

#endif
   /// Returns the start value of the phi, if one is set.
   VPValue *getStartValue() {
     return getNumOperands() == 0 ? nullptr : getOperand(0);
   }
   VPValue *getStartValue() const {
     return getNumOperands() == 0 ? nullptr : getOperand(0);
   }
 
+  /// Update the start value of the recipe.
+  void setStartValue(VPValue *V) { setOperand(0, V); }
+
   /// Returns the incoming value from the loop backedge.
   VPValue *getBackedgeValue() {
     return getOperand(1);
   }
 
   /// Returns the backedge value as a recipe. The backedge value is guaranteed
   /// to be a recipe.
   VPRecipeBase &getBackedgeRecipe() {
VP_CLASSOF_IMPL(VPRecipeBase::VPWidenPointerInductionSC,
                   VPValue::VPVWidenPointerInductionSC)
 
   /// Generate vector values for the pointer induction.
   void execute(VPTransformState &State) override;
 
   /// Returns true if only scalar values will be generated.
   bool onlyScalarsGenerated(ElementCount VF);
 
+  /// Returns the induction descriptor for the recipe.
+  const InductionDescriptor &getInductionDescriptor() const { return IndDesc; }
+
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   /// Print the recipe.
   void print(raw_ostream &O, const Twine &Indent,
              VPSlotTracker &SlotTracker) const override;
 #endif
 };
 
 /// A recipe for handling header phis that are widened in the vector loop.

llvm/test/Transforms/LoopVectorize/AArch64/epilog-vectorization-widen-inductions.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --replace-value-regex "!llvm.loop ![0-9]+"
 ; RUN: opt -passes='loop-vectorize' -force-vector-width=2 -enable-epilogue-vectorization -epilogue-vectorization-force-VF=2 -S %s | FileCheck %s
 
 target triple = "arm64-apple-macosx"
 
 ; Test for #57712.
 define void @test_widen_ptr_induction(ptr %ptr.start.1) {
 ; CHECK-LABEL: @test_widen_ptr_induction(
 ; CHECK-NEXT:  iter.check:
 ; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
 ; CHECK:       vector.main.loop.iter.check:
 ; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
+; CHECK-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[PTR_START_1:%.*]], i64 10000
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
-; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[PTR_START_1:%.*]], i64 [[TMP0]]
+; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP0]]
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[INDEX]], 1
 ; CHECK-NEXT:    [[NEXT_GEP1:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP1]]
 ; CHECK-NEXT:    [[TMP2:%.*]] = insertelement <2 x ptr> poison, ptr [[NEXT_GEP]], i32 0
 ; CHECK-NEXT:    [[TMP3:%.*]] = insertelement <2 x ptr> [[TMP2]], ptr [[NEXT_GEP1]], i32 1
 ; CHECK-NEXT:    [[TMP4:%.*]] = add i64 [[INDEX]], 2
 ; CHECK-NEXT:    [[NEXT_GEP2:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP4]]
 ; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[INDEX]], 3
 ; CHECK-NEXT:    [[NEXT_GEP3:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP5]]

 ; CHECK-NEXT:    store <2 x i8> zeroinitializer, ptr [[TMP15]], align 1
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
 ; CHECK-NEXT:    [[TMP16:%.*]] = icmp eq i64 [[INDEX_NEXT]], 10000
 ; CHECK-NEXT:    br i1 [[TMP16]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 10001, 10000
 ; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
 ; CHECK:       vec.epilog.iter.check:
-; CHECK-NEXT:    [[IND_END4:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 10000
+; CHECK-NEXT:    [[IND_END6:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 10000
 ; CHECK-NEXT:    br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
 ; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi ptr [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[PTR_START_1]], [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
 ; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
-; CHECK-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 10000
+; CHECK-NEXT:    [[IND_END5:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 10000
 ; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
 ; CHECK:       vec.epilog.vector.body:
-; CHECK-NEXT:    [[INDEX7:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT10:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
-; CHECK-NEXT:    [[TMP17:%.*]] = add i64 [[INDEX7]], 0
-; CHECK-NEXT:    [[NEXT_GEP8:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP17]]
-; CHECK-NEXT:    [[TMP18:%.*]] = add i64 [[INDEX7]], 1
-; CHECK-NEXT:    [[NEXT_GEP9:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP18]]
-; CHECK-NEXT:    [[TMP19:%.*]] = insertelement <2 x ptr> poison, ptr [[NEXT_GEP8]], i32 0
-; CHECK-NEXT:    [[TMP20:%.*]] = insertelement <2 x ptr> [[TMP19]], ptr [[NEXT_GEP9]], i32 1
+; CHECK-NEXT:    [[INDEX9:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT12:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP17:%.*]] = add i64 [[INDEX9]], 0
+; CHECK-NEXT:    [[NEXT_GEP10:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP17]]
+; CHECK-NEXT:    [[TMP18:%.*]] = add i64 [[INDEX9]], 1
+; CHECK-NEXT:    [[NEXT_GEP11:%.*]] = getelementptr i8, ptr [[PTR_START_1]], i64 [[TMP18]]
+; CHECK-NEXT:    [[TMP19:%.*]] = insertelement <2 x ptr> poison, ptr [[NEXT_GEP10]], i32 0
+; CHECK-NEXT:    [[TMP20:%.*]] = insertelement <2 x ptr> [[TMP19]], ptr [[NEXT_GEP11]], i32 1
 ; CHECK-NEXT:    [[TMP21:%.*]] = icmp ne <2 x ptr> [[TMP20]], zeroinitializer
 ; CHECK-NEXT:    [[TMP22:%.*]] = extractelement <2 x i1> [[TMP21]], i32 0
 ; CHECK-NEXT:    tail call void @llvm.assume(i1 [[TMP22]])
 ; CHECK-NEXT:    [[TMP23:%.*]] = extractelement <2 x i1> [[TMP21]], i32 1
 ; CHECK-NEXT:    tail call void @llvm.assume(i1 [[TMP23]])
-; CHECK-NEXT:    [[TMP24:%.*]] = getelementptr i8, ptr [[NEXT_GEP8]], i32 0
+; CHECK-NEXT:    [[TMP24:%.*]] = getelementptr i8, ptr [[NEXT_GEP10]], i32 0
 ; CHECK-NEXT:    store <2 x i8> zeroinitializer, ptr [[TMP24]], align 1
-; CHECK-NEXT:    [[INDEX_NEXT10]] = add nuw i64 [[INDEX7]], 2
-; CHECK-NEXT:    [[TMP25:%.*]] = icmp eq i64 [[INDEX_NEXT10]], 10000
+; CHECK-NEXT:    [[INDEX_NEXT12]] = add nuw i64 [[INDEX9]], 2
+; CHECK-NEXT:    [[TMP25:%.*]] = icmp eq i64 [[INDEX_NEXT12]], 10000
 ; CHECK-NEXT:    br i1 [[TMP25]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       vec.epilog.middle.block:
-; CHECK-NEXT:    [[CMP_N6:%.*]] = icmp eq i64 10001, 10000
-; CHECK-NEXT:    br i1 [[CMP_N6]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK-NEXT:    [[CMP_N8:%.*]] = icmp eq i64 10001, 10000
+; CHECK-NEXT:    br i1 [[CMP_N8]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
 ; CHECK:       vec.epilog.scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
-; CHECK-NEXT:    [[BC_RESUME_VAL5:%.*]] = phi ptr [ [[IND_END]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END4]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[PTR_START_1]], [[ITER_CHECK]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL4:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL7:%.*]] = phi ptr [ [[IND_END5]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END6]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[PTR_START_1]], [[ITER_CHECK]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
-; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[BC_RESUME_VAL5]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL4]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[BC_RESUME_VAL7]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-NEXT:    [[CMP_I_I_I_I:%.*]] = icmp ne ptr [[PTR_IV]], null
 ; CHECK-NEXT:    tail call void @llvm.assume(i1 [[CMP_I_I_I_I]])
 ; CHECK-NEXT:    store i8 0, ptr [[PTR_IV]], align 1
 ; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
 ; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i8, ptr [[PTR_IV]], i64 1
 ; CHECK-NEXT:    [[EC:%.*]] = icmp eq i64 [[IV]], 10000
 ; CHECK-NEXT:    br i1 [[EC]], label [[EXIT]], label [[LOOP]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       exit:

 exit:
   ret void
 }
 
 declare void @llvm.assume(i1 noundef)
 
 define void @test_widen_induction(ptr %A, i64 %N) {
 ; CHECK-LABEL: @test_widen_induction(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], 4
-; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:  iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], 2
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 [[N]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[N]], 4
 ; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[STEP_ADD:%.*]] = add <2 x i64> [[VEC_IND]], <i64 2, i64 2>
 ; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[INDEX]], 2
 ; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[A:%.*]], i64 [[TMP0]]
 ; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP1]]
 ; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 0
 ; CHECK-NEXT:    store <2 x i64> [[VEC_IND]], ptr [[TMP4]], align 4
 ; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 2
 ; CHECK-NEXT:    store <2 x i64> [[STEP_ADD]], ptr [[TMP5]], align 4
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <2 x i64> [[STEP_ADD]], <i64 2, i64 2>
 ; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
 ; CHECK-NEXT:    br i1 [[TMP6]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[N]], [[N_VEC]]
+; CHECK-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 2
+; CHECK-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[N_MOD_VF3:%.*]] = urem i64 [[N]], 2
+; CHECK-NEXT:    [[N_VEC4:%.*]] = sub i64 [[N]], [[N_MOD_VF3]]
+; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[BC_RESUME_VAL]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT]], <2 x i64> poison, <2 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <2 x i64> [[DOTSPLAT]], <i64 0, i64 1>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT11:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND8:%.*]] = phi <2 x i64> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT10:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP7:%.*]] = add i64 [[OFFSET_IDX]], 0
+; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP7]]
+; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i64, ptr [[TMP8]], i32 0
+; CHECK-NEXT:    store <2 x i64> [[VEC_IND8]], ptr [[TMP9]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT11]] = add nuw i64 [[OFFSET_IDX]], 2
+; CHECK-NEXT:    [[VEC_IND_NEXT10]] = add <2 x i64> [[VEC_IND8]], <i64 2, i64 2>
+; CHECK-NEXT:    [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT11]], [[N_VEC4]]
+; CHECK-NEXT:    br i1 [[TMP10]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N6:%.*]] = icmp eq i64 [[N]], [[N_VEC4]]
+; CHECK-NEXT:    br i1 [[CMP_N6]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL5:%.*]] = phi i64 [ [[N_VEC4]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_1_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[BC_RESUME_VAL5]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_1_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-NEXT:    [[GEP_A:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[IV_1]]
 ; CHECK-NEXT:    store i64 [[IV_1]], ptr [[GEP_A]], align 4
 ; CHECK-NEXT:    [[IV_1_NEXT]] = add nuw nsw i64 [[IV_1]], 1
 ; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[IV_1_NEXT]], [[N]]
 ; CHECK-NEXT:    br i1 [[EXITCOND]], label [[EXIT]], label [[LOOP]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret void
 ;
loop:
   br i1 %exitcond, label %exit, label %loop
 
 exit:
   ret void
 }
 
 define void @test_widen_induction_variable_start(ptr %A, i64 %N, i64 %start) {
 ; CHECK-LABEL: @test_widen_induction_variable_start(
-; CHECK-NEXT:  entry:
+; CHECK-NEXT:  iter.check:
 ; CHECK-NEXT:    [[TMP0:%.*]] = sub i64 [[N:%.*]], [[START:%.*]]
-; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 4
-; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 2
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 [[TMP0]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
 ; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
-; CHECK-NEXT:    [[IND_END:%.*]] = add i64 [[START]], [[N_VEC]]
 ; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[START]], i32 0
 ; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT]], <2 x i64> poison, <2 x i32> zeroinitializer
 ; CHECK-NEXT:    [[INDUCTION:%.*]] = add <2 x i64> [[DOTSPLAT]], <i64 0, i64 1>
+; CHECK-NEXT:    [[IND_END:%.*]] = add i64 [[START]], [[N_VEC]]
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <2 x i64> [ [[INDUCTION]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[STEP_ADD:%.*]] = add <2 x i64> [[VEC_IND]], <i64 2, i64 2>
 ; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = add i64 [[START]], [[INDEX]]
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[OFFSET_IDX]], 0
 ; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[OFFSET_IDX]], 2
 ; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[A:%.*]], i64 [[TMP1]]
 ; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP2]]
 ; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[TMP3]], i32 0
 ; CHECK-NEXT:    store <2 x i64> [[VEC_IND]], ptr [[TMP5]], align 4
 ; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i64, ptr [[TMP3]], i32 2
 ; CHECK-NEXT:    store <2 x i64> [[STEP_ADD]], ptr [[TMP6]], align 4
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <2 x i64> [[STEP_ADD]], <i64 2, i64 2>
 ; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
 ; CHECK-NEXT:    br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ [[START]], [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    [[IND_END6:%.*]] = add i64 [[START]], [[N_VEC]]
+; CHECK-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[TMP0]], [[N_VEC]]
+; CHECK-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 2
+; CHECK-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[N_MOD_VF3:%.*]] = urem i64 [[TMP0]], 2
+; CHECK-NEXT:    [[N_VEC4:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF3]]
+; CHECK-NEXT:    [[IND_END5:%.*]] = add i64 [[START]], [[N_VEC4]]
+; CHECK-NEXT:    [[DOTSPLATINSERT10:%.*]] = insertelement <2 x i64> poison, i64 [[BC_RESUME_VAL]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT11:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT10]], <2 x i64> poison, <2 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION12:%.*]] = add <2 x i64> [[DOTSPLAT11]], <i64 0, i64 1>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[INDEX9:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT17:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND13:%.*]] = phi <2 x i64> [ [[INDUCTION12]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT15:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[OFFSET_IDX16:%.*]] = add i64 [[START]], [[INDEX9]]
+; CHECK-NEXT:    [[TMP8:%.*]] = add i64 [[OFFSET_IDX16]], 0
+; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP8]]
+; CHECK-NEXT:    [[TMP10:%.*]] = getelementptr inbounds i64, ptr [[TMP9]], i32 0
+; CHECK-NEXT:    store <2 x i64> [[VEC_IND13]], ptr [[TMP10]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT17]] = add nuw i64 [[INDEX9]], 2
+; CHECK-NEXT:    [[VEC_IND_NEXT15]] = add <2 x i64> [[VEC_IND13]], <i64 2, i64 2>
+; CHECK-NEXT:    [[TMP11:%.*]] = icmp eq i64 [[INDEX_NEXT17]], [[N_VEC4]]
+; CHECK-NEXT:    br i1 [[TMP11]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N8:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC4]]
+; CHECK-NEXT:    br i1 [[CMP_N8]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL7:%.*]] = phi i64 [ [[IND_END5]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END6]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[ITER_CHECK:%.*]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_1_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[BC_RESUME_VAL7]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_1_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-NEXT:    [[GEP_A:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[IV_1]]
 ; CHECK-NEXT:    store i64 [[IV_1]], ptr [[GEP_A]], align 4
 ; CHECK-NEXT:    [[IV_1_NEXT]] = add nuw nsw i64 [[IV_1]], 1
 ; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[IV_1_NEXT]], [[N]]
 ; CHECK-NEXT:    br i1 [[EXITCOND]], label [[EXIT]], label [[LOOP]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret void
 ;
loop:
   br i1 %exitcond, label %exit, label %loop
 
 exit:
   ret void
 }
 
 define void @test_widen_induction_step_2(ptr %A, i64 %N, i32 %step) {
 ; CHECK-LABEL: @test_widen_induction_step_2(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], 4
-; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:  iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], 2
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 [[N]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[N]], 4
-; CHECK-NEXT:    [[IND_END:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
+; CHECK-NEXT:    [[IND_END5:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[STEP_ADD:%.*]] = add <2 x i64> [[VEC_IND]], <i64 2, i64 2>
 ; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[INDEX]], 2
 ; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[A:%.*]], i64 [[TMP0]]
 ; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP1]]
 ; CHECK-NEXT:    [[TMP4:%.*]] = add <2 x i64> [[VEC_IND]], <i64 10, i64 10>
 ; CHECK-NEXT:    [[TMP5:%.*]] = add <2 x i64> [[STEP_ADD]], <i64 10, i64 10>
 ; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 0
 ; CHECK-NEXT:    store <2 x i64> [[TMP4]], ptr [[TMP6]], align 4
 ; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 2
 ; CHECK-NEXT:    store <2 x i64> [[TMP5]], ptr [[TMP7]], align 4
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <2 x i64> [[STEP_ADD]], <i64 2, i64 2>
-; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[IND_END]]
+; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[IND_END5]]
 ; CHECK-NEXT:    br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       middle.block:
-; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N]], [[IND_END]]
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
-; CHECK-NEXT:    [[BC_RESUME_VAL1:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N]], [[IND_END5]]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[N]], [[IND_END5]]
+; CHECK-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 2
+; CHECK-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[N_MOD_VF3:%.*]] = urem i64 [[N]], 2
+; CHECK-NEXT:    [[IND_END:%.*]] = sub i64 [[N]], [[N_MOD_VF3]]
+; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <2 x i64> poison, i64 [[BC_RESUME_VAL]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <2 x i64> [[DOTSPLATINSERT]], <2 x i64> poison, <2 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <2 x i64> [[DOTSPLAT]], <i64 0, i64 1>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT13:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND10:%.*]] = phi <2 x i64> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT12:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP9:%.*]] = add i64 [[OFFSET_IDX]], 0
+; CHECK-NEXT:    [[TMP10:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP9]]
+; CHECK-NEXT:    [[TMP11:%.*]] = add <2 x i64> [[VEC_IND10]], <i64 10, i64 10>
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i64, ptr [[TMP10]], i32 0
+; CHECK-NEXT:    store <2 x i64> [[TMP11]], ptr [[TMP12]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT13]] = add nuw i64 [[OFFSET_IDX]], 2
+; CHECK-NEXT:    [[VEC_IND_NEXT12]] = add <2 x i64> [[VEC_IND10]], <i64 2, i64 2>
+; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i64 [[INDEX_NEXT13]], [[IND_END]]
+; CHECK-NEXT:    br i1 [[TMP13]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N8:%.*]] = icmp eq i64 [[N]], [[IND_END]]
+; CHECK-NEXT:    br i1 [[CMP_N8]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL6:%.*]] = phi i64 [ [[IND_END]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL7:%.*]] = phi i64 [ [[IND_END]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_1_NEXT:%.*]], [[LOOP]] ]
-; CHECK-NEXT:    [[IV_2:%.*]] = phi i64 [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ], [ [[IV_1_NEXT]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV_1:%.*]] = phi i64 [ [[BC_RESUME_VAL6]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_1_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV_2:%.*]] = phi i64 [ [[BC_RESUME_VAL7]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_1_NEXT]], [[LOOP]] ]
 ; CHECK-NEXT:    [[GEP_A:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[IV_1]]
 ; CHECK-NEXT:    [[ADD:%.*]] = add i64 [[IV_2]], 10
 ; CHECK-NEXT:    store i64 [[ADD]], ptr [[GEP_A]], align 4
 ; CHECK-NEXT:    [[IV_1_NEXT]] = add nuw nsw i64 [[IV_1]], 1
 ; CHECK-NEXT:    [[IV_2_NEXT:%.*]] = add nuw nsw i64 [[IV_1]], 2
 ; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i64 [[IV_1_NEXT]], [[N]]
 ; CHECK-NEXT:    br i1 [[EXITCOND]], label [[EXIT]], label [[LOOP]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       exit:
loop:
   br i1 %exitcond, label %exit, label %loop
 
 exit:
   ret void
 }
 
 define void @test_widen_extended_induction(ptr %dst) {
 ; CHECK-LABEL: @test_widen_extended_induction(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]]
+; CHECK-NEXT:  iter.check:
+; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]]
 ; CHECK:       vector.scevcheck:
-; CHECK-NEXT:    br i1 true, label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:    br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <2 x i8> [ <i8 0, i8 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[STEP_ADD:%.*]] = add <2 x i8> [[VEC_IND]], <i8 2, i8 2>
 ; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = trunc i32 [[INDEX]] to i8
 ; CHECK-NEXT:    [[TMP0:%.*]] = add i8 [[OFFSET_IDX]], 0
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i8 [[OFFSET_IDX]], 2
 ; CHECK-NEXT:    [[TMP2:%.*]] = zext i8 [[TMP0]] to i64
 ; CHECK-NEXT:    [[TMP3:%.*]] = zext i8 [[TMP1]] to i64
 ; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds [6 x i8], ptr [[DST:%.*]], i64 0, i64 [[TMP2]]
 ; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds [6 x i8], ptr [[DST]], i64 0, i64 [[TMP3]]
 ; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i8, ptr [[TMP4]], i32 0
 ; CHECK-NEXT:    store <2 x i8> [[VEC_IND]], ptr [[TMP6]], align 1
 ; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr inbounds i8, ptr [[TMP4]], i32 2
 ; CHECK-NEXT:    store <2 x i8> [[STEP_ADD]], ptr [[TMP7]], align 1
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <2 x i8> [[STEP_ADD]], <i8 2, i8 2>
 ; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i32 [[INDEX_NEXT]], 10000
 ; CHECK-NEXT:    br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 10000, 10000
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i8 [ 16, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ], [ 0, [[VECTOR_SCEVCHECK]] ]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i8 [ 16, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i32 [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <2 x i8> poison, i8 [[BC_RESUME_VAL]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT]], <2 x i8> poison, <2 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <2 x i8> [[DOTSPLAT]], <i8 0, i8 1>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[INDEX4:%.*]] = phi i32 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT9:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND5:%.*]] = phi <2 x i8> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT7:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[OFFSET_IDX8:%.*]] = trunc i32 [[INDEX4]] to i8
+; CHECK-NEXT:    [[TMP9:%.*]] = add i8 [[OFFSET_IDX8]], 0
+; CHECK-NEXT:    [[TMP10:%.*]] = zext i8 [[TMP9]] to i64
+; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr inbounds [6 x i8], ptr [[DST]], i64 0, i64 [[TMP10]]
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i8, ptr [[TMP11]], i32 0
+; CHECK-NEXT:    store <2 x i8> [[VEC_IND5]], ptr [[TMP12]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT9]] = add nuw i32 [[INDEX4]], 2
+; CHECK-NEXT:    [[VEC_IND_NEXT7]] = add <2 x i8> [[VEC_IND5]], <i8 2, i8 2>
+; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i32 [[INDEX_NEXT9]], 10000
+; CHECK-NEXT:    br i1 [[TMP13]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N3:%.*]] = icmp eq i32 10000, 10000
+; CHECK-NEXT:    br i1 [[CMP_N3]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL2:%.*]] = phi i8 [ 16, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 16, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_SCEVCHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i8 [ [[BC_RESUME_VAL2]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-NEXT:    [[IV_EXT:%.*]] = zext i8 [[IV]] to i64
 ; CHECK-NEXT:    [[ARRAYIDX1449:%.*]] = getelementptr inbounds [6 x i8], ptr [[DST]], i64 0, i64 [[IV_EXT]]
 ; CHECK-NEXT:    store i8 [[IV]], ptr [[ARRAYIDX1449]], align 1
 ; CHECK-NEXT:    [[IV_NEXT]] = add i8 [[IV]], 1
 ; CHECK-NEXT:    [[IV_NEXT_EXT:%.*]] = zext i8 [[IV_NEXT]] to i32
 ; CHECK-NEXT:    [[EC:%.*]] = icmp eq i32 [[IV_NEXT_EXT]], 10000
 ; CHECK-NEXT:    br i1 [[EC]], label [[EXIT]], label [[LOOP]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       exit:
loop:
   br i1 %ec, label %exit, label %loop
 
 exit:
   ret void
 }
 
 define void @test_widen_truncated_induction(ptr %A) {
 ; CHECK-LABEL: @test_widen_truncated_induction(
-; CHECK-NEXT:  entry:
-; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:  iter.check:
+; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <2 x i8> [ <i8 0, i8 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[STEP_ADD:%.*]] = add <2 x i8> [[VEC_IND]], <i8 2, i8 2>
 ; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i64 [[INDEX]], 2
 ; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i64 [[TMP0]]
 ; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[TMP1]]
 ; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i32 0
 ; CHECK-NEXT:    store <2 x i8> [[VEC_IND]], ptr [[TMP4]], align 1
 ; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i32 2
 ; CHECK-NEXT:    store <2 x i8> [[STEP_ADD]], ptr [[TMP5]], align 1
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <2 x i8> [[STEP_ADD]], <i8 2, i8 2>
 ; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 10000
 ; CHECK-NEXT:    br i1 [[TMP6]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 10000, 10000
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 10000, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[TMP7:%.*]] = trunc i64 [[BC_RESUME_VAL]] to i8
+; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <2 x i8> poison, i8 [[TMP7]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT]], <2 x i8> poison, <2 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <2 x i8> [[DOTSPLAT]], <i8 0, i8 1>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT8:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND5:%.*]] = phi <2 x i8> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT7:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP8:%.*]] = add i64 [[OFFSET_IDX]], 0
+; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[TMP8]]
+; CHECK-NEXT:    [[TMP10:%.*]] = getelementptr inbounds i8, ptr [[TMP9]], i32 0
+; CHECK-NEXT:    store <2 x i8> [[VEC_IND5]], ptr [[TMP10]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT8]] = add nuw i64 [[OFFSET_IDX]], 2
+; CHECK-NEXT:    [[VEC_IND_NEXT7]] = add <2 x i8> [[VEC_IND5]], <i8 2, i8 2>
+; CHECK-NEXT:    [[TMP11:%.*]] = icmp eq i64 [[INDEX_NEXT8]], 10000
+; CHECK-NEXT:    br i1 [[TMP11]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N3:%.*]] = icmp eq i64 10000, 10000
+; CHECK-NEXT:    br i1 [[CMP_N3]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL2:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 10000, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL2]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-NEXT:    [[IV_TRUNC:%.*]] = trunc i64 [[IV]] to i8
 ; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
 ; CHECK-NEXT:    store i8 [[IV_TRUNC]], ptr [[ARRAYIDX]], align 1
 ; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
 ; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], 10000
 ; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT]], {{!llvm.loop ![0-9]+}}
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret void

llvm/test/Transforms/LoopVectorize/AArch64/sve-epilog-vect.ll

 ; CHECK-NEXT:    [[TMP3:%.*]] = mul i64 [[TMP2]], 32
 ; CHECK-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 10000, [[TMP3]]
 ; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-NEXT:    [[TMP5:%.*]] = mul i64 [[TMP4]], 32
 ; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 10000, [[TMP5]]
 ; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 10000, [[N_MOD_VF]]
+; CHECK-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[START:%.*]], i64 [[N_VEC]]
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[TMP6:%.*]] = add i64 [[INDEX]], 0
-; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[START:%.*]], i64 [[TMP6]]
+; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP6]]
 ; CHECK-NEXT:    [[TMP7:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-NEXT:    [[TMP8:%.*]] = mul i64 [[TMP7]], 16
 ; CHECK-NEXT:    [[TMP9:%.*]] = add i64 [[TMP8]], 0
 ; CHECK-NEXT:    [[TMP10:%.*]] = add i64 [[INDEX]], [[TMP9]]
 ; CHECK-NEXT:    [[NEXT_GEP2:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP10]]
 ; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr i8, ptr [[NEXT_GEP]], i32 0
 ; CHECK-NEXT:    store <vscale x 16 x i8> zeroinitializer, ptr [[TMP11]], align 1
 ; CHECK-NEXT:    [[TMP12:%.*]] = call i32 @llvm.vscale.i32()
 ; CHECK-NEXT:    [[TMP13:%.*]] = mul i32 [[TMP12]], 16
 ; CHECK-NEXT:    [[TMP14:%.*]] = getelementptr i8, ptr [[NEXT_GEP]], i32 [[TMP13]]
 ; CHECK-NEXT:    store <vscale x 16 x i8> zeroinitializer, ptr [[TMP14]], align 1
 ; CHECK-NEXT:    [[TMP15:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-NEXT:    [[TMP16:%.*]] = mul i64 [[TMP15]], 32
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP16]]
 ; CHECK-NEXT:    [[TMP17:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
 ; CHECK-NEXT:    br i1 [[TMP17]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 10000, [[N_VEC]]
 ; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
 ; CHECK:       vec.epilog.iter.check:
-; CHECK-NEXT:    [[IND_END5:%.*]] = getelementptr i8, ptr [[START]], i64 [[N_VEC]]
+; CHECK-NEXT:    [[IND_END7:%.*]] = getelementptr i8, ptr [[START]], i64 [[N_VEC]]
 ; CHECK-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 10000, [[N_VEC]]
 ; CHECK-NEXT:    [[TMP18:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-NEXT:    [[TMP19:%.*]] = mul i64 [[TMP18]], 8
 ; CHECK-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], [[TMP19]]
 ; CHECK-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
 ; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi ptr [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
 ; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
 ; CHECK-NEXT:    [[TMP20:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-NEXT:    [[TMP21:%.*]] = mul i64 [[TMP20]], 8
 ; CHECK-NEXT:    [[N_MOD_VF3:%.*]] = urem i64 10000, [[TMP21]]
 ; CHECK-NEXT:    [[N_VEC4:%.*]] = sub i64 10000, [[N_MOD_VF3]]
-; CHECK-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[START]], i64 [[N_VEC4]]
+; CHECK-NEXT:    [[IND_END6:%.*]] = getelementptr i8, ptr [[START]], i64 [[N_VEC4]]
 ; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
 ; CHECK:       vec.epilog.vector.body:
-; CHECK-NEXT:    [[INDEX8:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT10:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
-; CHECK-NEXT:    [[TMP22:%.*]] = add i64 [[INDEX8]], 0
-; CHECK-NEXT:    [[NEXT_GEP9:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP22]]
-; CHECK-NEXT:    [[TMP23:%.*]] = getelementptr i8, ptr [[NEXT_GEP9]], i32 0
+; CHECK-NEXT:    [[INDEX10:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT12:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP22:%.*]] = add i64 [[INDEX10]], 0
+; CHECK-NEXT:    [[NEXT_GEP11:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP22]]
+; CHECK-NEXT:    [[TMP23:%.*]] = getelementptr i8, ptr [[NEXT_GEP11]], i32 0
 ; CHECK-NEXT:    store <vscale x 8 x i8> zeroinitializer, ptr [[TMP23]], align 1
 ; CHECK-NEXT:    [[TMP24:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-NEXT:    [[TMP25:%.*]] = mul i64 [[TMP24]], 8
-; CHECK-NEXT:    [[INDEX_NEXT10]] = add nuw i64 [[INDEX8]], [[TMP25]]
-; CHECK-NEXT:    [[TMP26:%.*]] = icmp eq i64 [[INDEX_NEXT10]], [[N_VEC4]]
+; CHECK-NEXT:    [[INDEX_NEXT12]] = add nuw i64 [[INDEX10]], [[TMP25]]
+; CHECK-NEXT:    [[TMP26:%.*]] = icmp eq i64 [[INDEX_NEXT12]], [[N_VEC4]]
 ; CHECK-NEXT:    br i1 [[TMP26]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP9:![0-9]+]]
 ; CHECK:       vec.epilog.middle.block:
-; CHECK-NEXT:    [[CMP_N7:%.*]] = icmp eq i64 10000, [[N_VEC4]]
-; CHECK-NEXT:    br i1 [[CMP_N7]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK-NEXT:    [[CMP_N9:%.*]] = icmp eq i64 10000, [[N_VEC4]]
+; CHECK-NEXT:    br i1 [[CMP_N9]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
 ; CHECK:       vec.epilog.scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC4]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
-; CHECK-NEXT:    [[BC_RESUME_VAL6:%.*]] = phi ptr [ [[IND_END]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[ITER_CHECK]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL5:%.*]] = phi i64 [ [[N_VEC4]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL8:%.*]] = phi ptr [ [[IND_END6]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END7]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[ITER_CHECK]] ]
 ; CHECK-NEXT:    br label [[LOOP:%.*]]
 ; CHECK:       loop:
-; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
-; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[BC_RESUME_VAL6]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL5]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[BC_RESUME_VAL8]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-NEXT:    store i8 0, ptr [[PTR_IV]], align 1
 ; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i8, ptr [[PTR_IV]], i64 1
 ; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
 ; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 10000
 ; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT]], label [[LOOP]], !llvm.loop [[LOOP10:![0-9]+]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret void
 ;
 ; CHECK-VF8-LABEL: @test_pr57912_pointer_induction(
 ; CHECK-VF8-NEXT:  iter.check:
 ; CHECK-VF8-NEXT:    br i1 false, label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
 ; CHECK-VF8:       vector.main.loop.iter.check:
 ; CHECK-VF8-NEXT:    [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-VF8-NEXT:    [[TMP1:%.*]] = mul i64 [[TMP0]], 32
 ; CHECK-VF8-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 10000, [[TMP1]]
 ; CHECK-VF8-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK-VF8:       vector.ph:
 ; CHECK-VF8-NEXT:    [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-VF8-NEXT:    [[TMP3:%.*]] = mul i64 [[TMP2]], 32
 ; CHECK-VF8-NEXT:    [[N_MOD_VF:%.*]] = urem i64 10000, [[TMP3]]
 ; CHECK-VF8-NEXT:    [[N_VEC:%.*]] = sub i64 10000, [[N_MOD_VF]]
+; CHECK-VF8-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[START:%.*]], i64 [[N_VEC]]
 ; CHECK-VF8-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK-VF8:       vector.body:
 ; CHECK-VF8-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-VF8-NEXT:    [[TMP4:%.*]] = add i64 [[INDEX]], 0
-; CHECK-VF8-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[START:%.*]], i64 [[TMP4]]
+; CHECK-VF8-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP4]]
 ; CHECK-VF8-NEXT:    [[TMP5:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-VF8-NEXT:    [[TMP6:%.*]] = mul i64 [[TMP5]], 16
 ; CHECK-VF8-NEXT:    [[TMP7:%.*]] = add i64 [[TMP6]], 0
 ; CHECK-VF8-NEXT:    [[TMP8:%.*]] = add i64 [[INDEX]], [[TMP7]]
 ; CHECK-VF8-NEXT:    [[NEXT_GEP1:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP8]]
 ; CHECK-VF8-NEXT:    [[TMP9:%.*]] = getelementptr i8, ptr [[NEXT_GEP]], i32 0
 ; CHECK-VF8-NEXT:    store <vscale x 16 x i8> zeroinitializer, ptr [[TMP9]], align 1
 ; CHECK-VF8-NEXT:    [[TMP10:%.*]] = call i32 @llvm.vscale.i32()
 ; CHECK-VF8-NEXT:    [[TMP11:%.*]] = mul i32 [[TMP10]], 16
 ; CHECK-VF8-NEXT:    [[TMP12:%.*]] = getelementptr i8, ptr [[NEXT_GEP]], i32 [[TMP11]]
 ; CHECK-VF8-NEXT:    store <vscale x 16 x i8> zeroinitializer, ptr [[TMP12]], align 1
 ; CHECK-VF8-NEXT:    [[TMP13:%.*]] = call i64 @llvm.vscale.i64()
 ; CHECK-VF8-NEXT:    [[TMP14:%.*]] = mul i64 [[TMP13]], 32
 ; CHECK-VF8-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP14]]
 ; CHECK-VF8-NEXT:    [[TMP15:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
 ; CHECK-VF8-NEXT:    br i1 [[TMP15]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
 ; CHECK-VF8:       middle.block:
 ; CHECK-VF8-NEXT:    [[CMP_N:%.*]] = icmp eq i64 10000, [[N_VEC]]
 ; CHECK-VF8-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
 ; CHECK-VF8:       vec.epilog.iter.check:
-; CHECK-VF8-NEXT:    [[IND_END2:%.*]] = getelementptr i8, ptr [[START]], i64 [[N_VEC]]
+; CHECK-VF8-NEXT:    [[IND_END4:%.*]] = getelementptr i8, ptr [[START]], i64 [[N_VEC]]
 ; CHECK-VF8-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 10000, [[N_VEC]]
 ; CHECK-VF8-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 8
 ; CHECK-VF8-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
 ; CHECK-VF8:       vec.epilog.ph:
+; CHECK-VF8-NEXT:    [[BC_RESUME_VAL:%.*]] = phi ptr [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
 ; CHECK-VF8-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
-; CHECK-VF8-NEXT:    [[IND_END:%.*]] = getelementptr i8, ptr [[START]], i64 10000
+; CHECK-VF8-NEXT:    [[IND_END3:%.*]] = getelementptr i8, ptr [[START]], i64 10000
 ; CHECK-VF8-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
 ; CHECK-VF8:       vec.epilog.vector.body:
-; CHECK-VF8-NEXT:    [[INDEX5:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT7:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
-; CHECK-VF8-NEXT:    [[TMP16:%.*]] = add i64 [[INDEX5]], 0
-; CHECK-VF8-NEXT:    [[NEXT_GEP6:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP16]]
-; CHECK-VF8-NEXT:    [[TMP17:%.*]] = getelementptr i8, ptr [[NEXT_GEP6]], i32 0
+; CHECK-VF8-NEXT:    [[INDEX7:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT9:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-VF8-NEXT:    [[TMP16:%.*]] = add i64 [[INDEX7]], 0
+; CHECK-VF8-NEXT:    [[NEXT_GEP8:%.*]] = getelementptr i8, ptr [[START]], i64 [[TMP16]]
+; CHECK-VF8-NEXT:    [[TMP17:%.*]] = getelementptr i8, ptr [[NEXT_GEP8]], i32 0
 ; CHECK-VF8-NEXT:    store <8 x i8> zeroinitializer, ptr [[TMP17]], align 1
-; CHECK-VF8-NEXT:    [[INDEX_NEXT7]] = add nuw i64 [[INDEX5]], 8
-; CHECK-VF8-NEXT:    [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT7]], 10000
+; CHECK-VF8-NEXT:    [[INDEX_NEXT9]] = add nuw i64 [[INDEX7]], 8
+; CHECK-VF8-NEXT:    [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT9]], 10000
 ; CHECK-VF8-NEXT:    br i1 [[TMP18]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP9:![0-9]+]]
 ; CHECK-VF8:       vec.epilog.middle.block:
-; CHECK-VF8-NEXT:    [[CMP_N4:%.*]] = icmp eq i64 10000, 10000
-; CHECK-VF8-NEXT:    br i1 [[CMP_N4]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK-VF8-NEXT:    [[CMP_N6:%.*]] = icmp eq i64 10000, 10000
+; CHECK-VF8-NEXT:    br i1 [[CMP_N6]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
 ; CHECK-VF8:       vec.epilog.scalar.ph:
-; CHECK-VF8-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
-; CHECK-VF8-NEXT:    [[BC_RESUME_VAL3:%.*]] = phi ptr [ [[IND_END]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END2]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[ITER_CHECK]] ]
+; CHECK-VF8-NEXT:    [[BC_RESUME_VAL2:%.*]] = phi i64 [ 10000, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
+; CHECK-VF8-NEXT:    [[BC_RESUME_VAL5:%.*]] = phi ptr [ [[IND_END3]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END4]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[START]], [[ITER_CHECK]] ]
 ; CHECK-VF8-NEXT:    br label [[LOOP:%.*]]
 ; CHECK-VF8:       loop:
-; CHECK-VF8-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
-; CHECK-VF8-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[BC_RESUME_VAL3]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-VF8-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL2]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-VF8-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[BC_RESUME_VAL5]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP]] ]
 ; CHECK-VF8-NEXT:    store i8 0, ptr [[PTR_IV]], align 1
 ; CHECK-VF8-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i8, ptr [[PTR_IV]], i64 1
 ; CHECK-VF8-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
 ; CHECK-VF8-NEXT:    [[CMP:%.*]] = icmp eq i64 [[IV_NEXT]], 10000
 ; CHECK-VF8-NEXT:    br i1 [[CMP]], label [[EXIT]], label [[LOOP]], !llvm.loop [[LOOP10:![0-9]+]]
 ; CHECK-VF8:       exit:
 ; CHECK-VF8-NEXT:    ret void
 ;

llvm/test/Transforms/LoopVectorize/X86/conversion-cost.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -passes=loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx -S | FileCheck %s
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx10.8.0"
 
 define i32 @conversion_cost1(i32 %n, ptr nocapture %A, ptr nocapture %B) nounwind uwtable ssp {
 ; CHECK-LABEL: @conversion_cost1(
 ; CHECK-NEXT:    [[TMP1:%.*]] = icmp sgt i32 [[N:%.*]], 3
-; CHECK-NEXT:    br i1 [[TMP1]], label [[DOTLR_PH_PREHEADER:%.*]], label [[DOT_CRIT_EDGE:%.*]]
-; CHECK:       .lr.ph.preheader:
+; CHECK-NEXT:    br i1 [[TMP1]], label [[ITER_CHECK:%.*]], label [[DOT_CRIT_EDGE:%.*]]
+; CHECK:       iter.check:
 ; CHECK-NEXT:    [[TMP2:%.*]] = add i32 [[N]], -4
 ; CHECK-NEXT:    [[TMP3:%.*]] = zext i32 [[TMP2]] to i64
 ; CHECK-NEXT:    [[TMP4:%.*]] = add nuw nsw i64 [[TMP3]], 1
-; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP4]], 32
-; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP4]], 16
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 [[TMP4]], 32
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
 ; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[TMP4]], 32
 ; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP4]], [[N_MOD_VF]]
 ; CHECK-NEXT:    [[IND_END:%.*]] = add i64 3, [[N_VEC]]
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <32 x i8> [ <i8 3, i8 4, i8 5, i8 6, i8 7, i8 8, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 15, i8 16, i8 17, i8 18, i8 19, i8 20, i8 21, i8 22, i8 23, i8 24, i8 25, i8 26, i8 27, i8 28, i8 29, i8 30, i8 31, i8 32, i8 33, i8 34>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = add i64 3, [[INDEX]]
 ; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[OFFSET_IDX]], 0
 ; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i64 [[TMP5]]
 ; CHECK-NEXT:    [[TMP7:%.*]] = getelementptr inbounds i8, ptr [[TMP6]], i32 0
 ; CHECK-NEXT:    store <32 x i8> [[VEC_IND]], ptr [[TMP7]], align 1
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 32
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <32 x i8> [[VEC_IND]], <i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32, i8 32>
 ; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
 ; CHECK-NEXT:    br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP4]], [[N_VEC]]
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[DOT_CRIT_EDGE_LOOPEXIT:%.*]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 3, [[DOTLR_PH_PREHEADER]] ]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[DOT_CRIT_EDGE_LOOPEXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    [[IND_END5:%.*]] = add i64 3, [[N_VEC]]
+; CHECK-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[TMP4]], [[N_VEC]]
+; CHECK-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 16
+; CHECK-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ 3, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[N_MOD_VF2:%.*]] = urem i64 [[TMP4]], 16
+; CHECK-NEXT:    [[N_VEC3:%.*]] = sub i64 [[TMP4]], [[N_MOD_VF2]]
+; CHECK-NEXT:    [[IND_END4:%.*]] = add i64 3, [[N_VEC3]]
+; CHECK-NEXT:    [[TMP9:%.*]] = trunc i64 [[BC_RESUME_VAL]] to i8
+; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <16 x i8> poison, i8 [[TMP9]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <16 x i8> [[DOTSPLATINSERT]], <16 x i8> poison, <16 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <16 x i8> [[DOTSPLAT]], <i8 0, i8 1, i8 2, i8 3, i8 4, i8 5, i8 6, i8 7, i8 8, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 15>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[INDEX8:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT12:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND9:%.*]] = phi <16 x i8> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT10:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[OFFSET_IDX11:%.*]] = add i64 3, [[INDEX8]]
+; CHECK-NEXT:    [[TMP10:%.*]] = add i64 [[OFFSET_IDX11]], 0
+; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[TMP10]]
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i8, ptr [[TMP11]], i32 0
+; CHECK-NEXT:    store <16 x i8> [[VEC_IND9]], ptr [[TMP12]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT12]] = add nuw i64 [[INDEX8]], 16
+; CHECK-NEXT:    [[VEC_IND_NEXT10]] = add <16 x i8> [[VEC_IND9]], <i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16, i8 16>
+; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i64 [[INDEX_NEXT12]], [[N_VEC3]]
+; CHECK-NEXT:    br i1 [[TMP13]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP2:![0-9]+]]
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N7:%.*]] = icmp eq i64 [[TMP4]], [[N_VEC3]]
+; CHECK-NEXT:    br i1 [[CMP_N7]], label [[DOT_CRIT_EDGE_LOOPEXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL6:%.*]] = phi i64 [ [[IND_END4]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 3, [[ITER_CHECK]] ]
 ; CHECK-NEXT:    br label [[DOTLR_PH:%.*]]
 ; CHECK:       .lr.ph:
-; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[DOTLR_PH]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
-; CHECK-NEXT:    [[TMP9:%.*]] = trunc i64 [[INDVARS_IV]] to i8
-; CHECK-NEXT:    [[TMP10:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[INDVARS_IV]]
-; CHECK-NEXT:    store i8 [[TMP9]], ptr [[TMP10]], align 1
+; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[DOTLR_PH]] ], [ [[BC_RESUME_VAL6]], [[VEC_EPILOG_SCALAR_PH]] ]
+; CHECK-NEXT:    [[TMP14:%.*]] = trunc i64 [[INDVARS_IV]] to i8
+; CHECK-NEXT:    [[TMP15:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[INDVARS_IV]]
+; CHECK-NEXT:    store i8 [[TMP14]], ptr [[TMP15]], align 1
 ; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
 ; CHECK-NEXT:    [[LFTR_WIDEIV:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
 ; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[LFTR_WIDEIV]], [[N]]
-; CHECK-NEXT:    br i1 [[EXITCOND]], label [[DOT_CRIT_EDGE_LOOPEXIT]], label [[DOTLR_PH]], !llvm.loop [[LOOP2:![0-9]+]]
+; CHECK-NEXT:    br i1 [[EXITCOND]], label [[DOT_CRIT_EDGE_LOOPEXIT]], label [[DOTLR_PH]], !llvm.loop [[LOOP4:![0-9]+]]
 ; CHECK:       ._crit_edge.loopexit:
 ; CHECK-NEXT:    br label [[DOT_CRIT_EDGE]]
 ; CHECK:       ._crit_edge:
 ; CHECK-NEXT:    ret i32 undef
 ;
   %1 = icmp sgt i32 %n, 3
   br i1 %1, label %.lr.ph, label %._crit_edge
 

 ; CHECK-NEXT:    store <2 x float> [[TMP14]], ptr [[TMP22]], align 4
 ; CHECK-NEXT:    [[TMP23:%.*]] = getelementptr inbounds float, ptr [[TMP17]], i32 4
 ; CHECK-NEXT:    store <2 x float> [[TMP15]], ptr [[TMP23]], align 4
 ; CHECK-NEXT:    [[TMP24:%.*]] = getelementptr inbounds float, ptr [[TMP17]], i32 6
 ; CHECK-NEXT:    store <2 x float> [[TMP16]], ptr [[TMP24]], align 4
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
 ; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <2 x i64> [[STEP_ADD2]], <i64 2, i64 2>
 ; CHECK-NEXT:    [[TMP25:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
-; CHECK-NEXT:    br i1 [[TMP25]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
+; CHECK-NEXT:    br i1 [[TMP25]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP4]], [[N_VEC]]
 ; CHECK-NEXT:    br i1 [[CMP_N]], label [[DOT_CRIT_EDGE_LOOPEXIT:%.*]], label [[SCALAR_PH]]
 ; CHECK:       scalar.ph:
 ; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 9, [[DOTLR_PH_PREHEADER]] ]
 ; CHECK-NEXT:    br label [[DOTLR_PH:%.*]]
 ; CHECK:       .lr.ph:
 ; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[DOTLR_PH]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
 ; CHECK-NEXT:    [[ADD:%.*]] = add nsw i64 [[INDVARS_IV]], 3
 ; CHECK-NEXT:    [[TOFP:%.*]] = sitofp i64 [[ADD]] to float
 ; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds float, ptr [[B]], i64 [[INDVARS_IV]]
 ; CHECK-NEXT:    store float [[TOFP]], ptr [[GEP]], align 4
 ; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
 ; CHECK-NEXT:    [[LFTR_WIDEIV:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
 ; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[LFTR_WIDEIV]], [[N]]
-; CHECK-NEXT:    br i1 [[EXITCOND]], label [[DOT_CRIT_EDGE_LOOPEXIT]], label [[DOTLR_PH]], !llvm.loop [[LOOP5:![0-9]+]]
+; CHECK-NEXT:    br i1 [[EXITCOND]], label [[DOT_CRIT_EDGE_LOOPEXIT]], label [[DOTLR_PH]], !llvm.loop [[LOOP6:![0-9]+]]
 ; CHECK:       ._crit_edge.loopexit:
 ; CHECK-NEXT:    br label [[DOT_CRIT_EDGE]]
 ; CHECK:       ._crit_edge:
 ; CHECK-NEXT:    ret i32 undef
 ;
   %1 = icmp sgt i32 %n, 9
   br i1 %1, label %.lr.ph, label %._crit_edge
 

llvm/test/Transforms/LoopVectorize/X86/gather_scatter.ll

 ;    }
 ;  }
 ;}
 
 %struct.In = type { float, float }
 
 define void @foo2(%struct.In* noalias %in, float* noalias %out, i32* noalias %trigger, i32* noalias %index) #0 {
 ; AVX512-LABEL: @foo2(
-; AVX512-NEXT:  entry:
+; AVX512-NEXT:  iter.check:
 ; AVX512-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; AVX512:       vector.body:
-; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
-; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ENTRY]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ITER_CHECK:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ITER_CHECK]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, i32* [[TRIGGER:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER:%.*]] = call <16 x i32> @llvm.masked.gather.v16i32.v16p0i32(<16 x i32*> [[TMP0]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <16 x i32> poison)
 ; AVX512-NEXT:    [[TMP1:%.*]] = icmp sgt <16 x i32> [[WIDE_MASKED_GATHER]], zeroinitializer
 ; AVX512-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_IN:%.*]], %struct.In* [[IN:%.*]], <16 x i64> [[VEC_IND]], i32 1
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER2:%.*]] = call <16 x float> @llvm.masked.gather.v16f32.v16p0f32(<16 x float*> [[TMP2]], i32 4, <16 x i1> [[TMP1]], <16 x float> poison)
 ; AVX512-NEXT:    [[TMP3:%.*]] = fadd <16 x float> [[WIDE_MASKED_GATHER2]], <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>
 ; AVX512-NEXT:    [[TMP4:%.*]] = getelementptr inbounds float, float* [[OUT:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float> [[TMP3]], <16 x float*> [[TMP4]], i32 4, <16 x i1> [[TMP1]])

 ;    }
 ;  }
 ;}
 
 %struct.Out = type { float, float }
 
 define void @foo3(%struct.In* noalias %in, %struct.Out* noalias %out, i32* noalias %trigger) {
 ; AVX512-LABEL: @foo3(
-; AVX512-NEXT:  entry:
+; AVX512-NEXT:  iter.check:
 ; AVX512-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; AVX512:       vector.body:
-; AVX512-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
-; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ENTRY]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[ITER_CHECK:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ITER_CHECK]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, i32* [[TRIGGER:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER:%.*]] = call <16 x i32> @llvm.masked.gather.v16i32.v16p0i32(<16 x i32*> [[TMP0]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <16 x i32> poison)
 ; AVX512-NEXT:    [[TMP1:%.*]] = icmp sgt <16 x i32> [[WIDE_MASKED_GATHER]], zeroinitializer
 ; AVX512-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_IN:%.*]], %struct.In* [[IN:%.*]], <16 x i64> [[VEC_IND]], i32 1
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER1:%.*]] = call <16 x float> @llvm.masked.gather.v16f32.v16p0f32(<16 x float*> [[TMP2]], i32 4, <16 x i1> [[TMP1]], <16 x float> poison)
 ; AVX512-NEXT:    [[TMP3:%.*]] = fadd <16 x float> [[WIDE_MASKED_GATHER1]], <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>
 ; AVX512-NEXT:    [[TMP4:%.*]] = getelementptr inbounds [[STRUCT_OUT:%.*]], %struct.Out* [[OUT:%.*]], <16 x i64> [[VEC_IND]], i32 1
 ; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float> [[TMP3]], <16 x float*> [[TMP4]], i32 4, <16 x i1> [[TMP1]])
for.end:
   ret void
 }
 declare void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float>, <16 x float*>, i32, <16 x i1>)
 
 ; The same as @foo2 but scatter/gather argument is a vecotr of ptrs with addresspace 1
 
 define void @foo2_addrspace(%struct.In addrspace(1)* noalias %in, float addrspace(1)* noalias %out, i32* noalias %trigger, i32* noalias %index) #0 {
 ; AVX512-LABEL: @foo2_addrspace(
-; AVX512-NEXT:  entry:
+; AVX512-NEXT:  iter.check:
 ; AVX512-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; AVX512:       vector.body:
-; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
-; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ENTRY]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ITER_CHECK:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ITER_CHECK]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, i32* [[TRIGGER:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER:%.*]] = call <16 x i32> @llvm.masked.gather.v16i32.v16p0i32(<16 x i32*> [[TMP0]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <16 x i32> poison)
 ; AVX512-NEXT:    [[TMP1:%.*]] = icmp sgt <16 x i32> [[WIDE_MASKED_GATHER]], zeroinitializer
 ; AVX512-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_IN:%.*]], [[STRUCT_IN]] addrspace(1)* [[IN:%.*]], <16 x i64> [[VEC_IND]], i32 1
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER2:%.*]] = call <16 x float> @llvm.masked.gather.v16f32.v16p1f32(<16 x float addrspace(1)*> [[TMP2]], i32 4, <16 x i1> [[TMP1]], <16 x float> poison)
 ; AVX512-NEXT:    [[TMP3:%.*]] = fadd <16 x float> [[WIDE_MASKED_GATHER2]], <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>
 ; AVX512-NEXT:    [[TMP4:%.*]] = getelementptr inbounds float, float addrspace(1)* [[OUT:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p1f32(<16 x float> [[TMP3]], <16 x float addrspace(1)*> [[TMP4]], i32 4, <16 x i1> [[TMP1]])

 for.end:
   ret void
 }
 
 ; Same as foo2_addrspace but here only the input has the non-default address space.
 
 define void @foo2_addrspace2(%struct.In addrspace(1)* noalias %in, float addrspace(0)* noalias %out, i32* noalias %trigger, i32* noalias %index) {
 ; AVX512-LABEL: @foo2_addrspace2(
-; AVX512-NEXT:  entry:
+; AVX512-NEXT:  iter.check:
 ; AVX512-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; AVX512:       vector.body:
-; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
-; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ENTRY]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ITER_CHECK:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ITER_CHECK]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, i32* [[TRIGGER:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER:%.*]] = call <16 x i32> @llvm.masked.gather.v16i32.v16p0i32(<16 x i32*> [[TMP0]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <16 x i32> poison)
 ; AVX512-NEXT:    [[TMP1:%.*]] = icmp sgt <16 x i32> [[WIDE_MASKED_GATHER]], zeroinitializer
 ; AVX512-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_IN:%.*]], [[STRUCT_IN]] addrspace(1)* [[IN:%.*]], <16 x i64> [[VEC_IND]], i32 1
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER2:%.*]] = call <16 x float> @llvm.masked.gather.v16f32.v16p1f32(<16 x float addrspace(1)*> [[TMP2]], i32 4, <16 x i1> [[TMP1]], <16 x float> poison)
 ; AVX512-NEXT:    [[TMP3:%.*]] = fadd <16 x float> [[WIDE_MASKED_GATHER2]], <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>
 ; AVX512-NEXT:    [[TMP4:%.*]] = getelementptr inbounds float, float* [[OUT:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float> [[TMP3]], <16 x float*> [[TMP4]], i32 4, <16 x i1> [[TMP1]])

 for.end:
   ret void
 }
 
 ; Same as foo2_addrspace but here only the output has the non-default address space.
 
 define void @foo2_addrspace3(%struct.In addrspace(0)* noalias %in, float addrspace(1)* noalias %out, i32* noalias %trigger, i32* noalias %index) {
 ; AVX512-LABEL: @foo2_addrspace3(
-; AVX512-NEXT:  entry:
+; AVX512-NEXT:  iter.check:
 ; AVX512-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; AVX512:       vector.body:
-; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
-; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ENTRY]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[ITER_CHECK:%.*]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; AVX512-NEXT:    [[VEC_IND:%.*]] = phi <16 x i64> [ <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>, [[ITER_CHECK]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, i32* [[TRIGGER:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER:%.*]] = call <16 x i32> @llvm.masked.gather.v16i32.v16p0i32(<16 x i32*> [[TMP0]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>, <16 x i32> poison)
 ; AVX512-NEXT:    [[TMP1:%.*]] = icmp sgt <16 x i32> [[WIDE_MASKED_GATHER]], zeroinitializer
 ; AVX512-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[STRUCT_IN:%.*]], %struct.In* [[IN:%.*]], <16 x i64> [[VEC_IND]], i32 1
 ; AVX512-NEXT:    [[WIDE_MASKED_GATHER2:%.*]] = call <16 x float> @llvm.masked.gather.v16f32.v16p0f32(<16 x float*> [[TMP2]], i32 4, <16 x i1> [[TMP1]], <16 x float> poison)
 ; AVX512-NEXT:    [[TMP3:%.*]] = fadd <16 x float> [[WIDE_MASKED_GATHER2]], <float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01, float 5.000000e-01>
 ; AVX512-NEXT:    [[TMP4:%.*]] = getelementptr inbounds float, float addrspace(1)* [[OUT:%.*]], <16 x i64> [[VEC_IND]]
 ; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p1f32(<16 x float> [[TMP3]], <16 x float addrspace(1)*> [[TMP4]], i32 4, <16 x i1> [[TMP1]])

 define void @test_gather_not_profitable_pr48429(i32 %d, float* readonly noalias %ptr, float* nocapture noalias %dest) {
 ; AVX512-LABEL: @test_gather_not_profitable_pr48429(
 ; AVX512-NEXT:  entry:
 ; AVX512-NEXT:    [[DEST1:%.*]] = bitcast float* [[DEST:%.*]] to i8*
 ; AVX512-NEXT:    [[PTR3:%.*]] = bitcast float* [[PTR:%.*]] to i8*
 ; AVX512-NEXT:    [[IDX_EXT:%.*]] = sext i32 [[D:%.*]] to i64
 ; AVX512-NEXT:    [[ADD_PTR:%.*]] = getelementptr inbounds float, float* [[PTR]], i64 [[IDX_EXT]]
 ; AVX512-NEXT:    [[CMP_NOT10:%.*]] = icmp eq i32 [[D]], 0
-; AVX512-NEXT:    br i1 [[CMP_NOT10]], label [[FOR_END:%.*]], label [[FOR_BODY_LR_PH:%.*]]
-; AVX512:       for.body.lr.ph:
+; AVX512-NEXT:    br i1 [[CMP_NOT10]], label [[FOR_END:%.*]], label [[ITER_CHECK:%.*]]
+; AVX512:       iter.check:
 ; AVX512-NEXT:    [[MUL:%.*]] = sub nsw i32 0, [[D]]
 ; AVX512-NEXT:    [[IDXPROM:%.*]] = sext i32 [[MUL]] to i64
 ; AVX512-NEXT:    [[TMP0:%.*]] = shl nsw i64 [[IDX_EXT]], 2
 ; AVX512-NEXT:    [[TMP1:%.*]] = add nsw i64 [[TMP0]], -4
 ; AVX512-NEXT:    [[TMP2:%.*]] = lshr i64 [[TMP1]], 2
 ; AVX512-NEXT:    [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 1
-; AVX512-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP3]], 32
-; AVX512-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_MEMCHECK:%.*]]
+; AVX512-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP3]], 8
+; AVX512-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MEMCHECK:%.*]]
 ; AVX512:       vector.memcheck:
 ; AVX512-NEXT:    [[TMP4:%.*]] = shl nsw i64 [[IDX_EXT]], 2
 ; AVX512-NEXT:    [[TMP5:%.*]] = add nsw i64 [[TMP4]], -4
 ; AVX512-NEXT:    [[TMP6:%.*]] = lshr i64 [[TMP5]], 2
 ; AVX512-NEXT:    [[TMP7:%.*]] = shl i64 [[TMP6]], 4
 ; AVX512-NEXT:    [[TMP8:%.*]] = add nuw nsw i64 [[TMP7]], 2
 ; AVX512-NEXT:    [[SCEVGEP:%.*]] = getelementptr float, float* [[DEST]], i64 [[TMP8]]
 ; AVX512-NEXT:    [[SCEVGEP2:%.*]] = bitcast float* [[SCEVGEP]] to i8*
 ; AVX512-NEXT:    [[TMP9:%.*]] = add nuw nsw i64 [[TMP6]], 1
 ; AVX512-NEXT:    [[SCEVGEP4:%.*]] = getelementptr float, float* [[PTR]], i64 [[TMP9]]
 ; AVX512-NEXT:    [[SCEVGEP45:%.*]] = bitcast float* [[SCEVGEP4]] to i8*
 ; AVX512-NEXT:    [[SCEVGEP6:%.*]] = getelementptr float, float* [[PTR]], i64 [[IDXPROM]]
 ; AVX512-NEXT:    [[SCEVGEP67:%.*]] = bitcast float* [[SCEVGEP6]] to i8*
 ; AVX512-NEXT:    [[TMP10:%.*]] = add i64 [[TMP6]], 1
 ; AVX512-NEXT:    [[TMP11:%.*]] = sub i64 [[TMP10]], [[IDX_EXT]]
 ; AVX512-NEXT:    [[SCEVGEP8:%.*]] = getelementptr float, float* [[PTR]], i64 [[TMP11]]
 ; AVX512-NEXT:    [[SCEVGEP89:%.*]] = bitcast float* [[SCEVGEP8]] to i8*
 ; AVX512-NEXT:    [[BOUND0:%.*]] = icmp ult i8* [[DEST1]], [[SCEVGEP45]]
 ; AVX512-NEXT:    [[BOUND1:%.*]] = icmp ult i8* [[PTR3]], [[SCEVGEP2]]
 ; AVX512-NEXT:    [[FOUND_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
 ; AVX512-NEXT:    [[BOUND010:%.*]] = icmp ult i8* [[DEST1]], [[SCEVGEP89]]
 ; AVX512-NEXT:    [[BOUND111:%.*]] = icmp ult i8* [[SCEVGEP67]], [[SCEVGEP2]]
 ; AVX512-NEXT:    [[FOUND_CONFLICT12:%.*]] = and i1 [[BOUND010]], [[BOUND111]]
 ; AVX512-NEXT:    [[CONFLICT_RDX:%.*]] = or i1 [[FOUND_CONFLICT]], [[FOUND_CONFLICT12]]
-; AVX512-NEXT:    br i1 [[CONFLICT_RDX]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
+; AVX512-NEXT:    br i1 [[CONFLICT_RDX]], label [[VEC_EPILOG_SCALAR_PH]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; AVX512:       vector.main.loop.iter.check:
+; AVX512-NEXT:    [[MIN_ITERS_CHECK13:%.*]] = icmp ult i64 [[TMP3]], 16
+; AVX512-NEXT:    br i1 [[MIN_ITERS_CHECK13]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; AVX512:       vector.ph:
 ; AVX512-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[TMP3]], 16
 ; AVX512-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP3]], [[N_MOD_VF]]
 ; AVX512-NEXT:    [[IND_END:%.*]] = getelementptr float, float* [[PTR]], i64 [[N_VEC]]
 ; AVX512-NEXT:    [[TMP12:%.*]] = mul i64 [[N_VEC]], 16
-; AVX512-NEXT:    [[IND_END13:%.*]] = getelementptr float, float* [[DEST]], i64 [[TMP12]]
+; AVX512-NEXT:    [[IND_END15:%.*]] = getelementptr float, float* [[DEST]], i64 [[TMP12]]
 ; AVX512-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; AVX512:       vector.body:
 ; AVX512-NEXT:    [[POINTER_PHI:%.*]] = phi float* [ [[DEST]], [[VECTOR_PH]] ], [ [[PTR_IND:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; AVX512-NEXT:    [[TMP13:%.*]] = add i64 [[INDEX]], 0
 ; AVX512-NEXT:    [[NEXT_GEP:%.*]] = getelementptr float, float* [[PTR]], i64 [[TMP13]]
 ; AVX512-NEXT:    [[TMP14:%.*]] = getelementptr float, float* [[POINTER_PHI]], <16 x i64> <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112, i64 128, i64 144, i64 160, i64 176, i64 192, i64 208, i64 224, i64 240>
 ; AVX512-NEXT:    [[TMP15:%.*]] = getelementptr inbounds float, float* [[NEXT_GEP]], i64 [[IDXPROM]]
 ; AVX512-NEXT:    [[TMP16:%.*]] = getelementptr inbounds float, float* [[TMP15]], i32 0
 ; AVX512-NEXT:    [[TMP17:%.*]] = bitcast float* [[TMP16]] to <16 x float>*
 ; AVX512-NEXT:    [[WIDE_LOAD:%.*]] = load <16 x float>, <16 x float>* [[TMP17]], align 4, !alias.scope !14
 ; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float> [[WIDE_LOAD]], <16 x float*> [[TMP14]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>), !alias.scope !17, !noalias !19
 ; AVX512-NEXT:    [[TMP18:%.*]] = getelementptr float, float* [[NEXT_GEP]], i32 0
 ; AVX512-NEXT:    [[TMP19:%.*]] = bitcast float* [[TMP18]] to <16 x float>*
-; AVX512-NEXT:    [[WIDE_LOAD15:%.*]] = load <16 x float>, <16 x float>* [[TMP19]], align 4, !alias.scope !21
+; AVX512-NEXT:    [[WIDE_LOAD14:%.*]] = load <16 x float>, <16 x float>* [[TMP19]], align 4, !alias.scope !21
 ; AVX512-NEXT:    [[TMP20:%.*]] = getelementptr inbounds float, <16 x float*> [[TMP14]], i64 1
-; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float> [[WIDE_LOAD15]], <16 x float*> [[TMP20]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>), !alias.scope !17, !noalias !19
+; AVX512-NEXT:    call void @llvm.masked.scatter.v16f32.v16p0f32(<16 x float> [[WIDE_LOAD14]], <16 x float*> [[TMP20]], i32 4, <16 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>), !alias.scope !17, !noalias !19
 ; AVX512-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 16
 ; AVX512-NEXT:    [[PTR_IND]] = getelementptr float, float* [[POINTER_PHI]], i64 256
 ; AVX512-NEXT:    [[TMP21:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
 ; AVX512-NEXT:    br i1 [[TMP21]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP22:![0-9]+]]
 ; AVX512:       middle.block:
 ; AVX512-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP3]], [[N_VEC]]
-; AVX512-NEXT:    br i1 [[CMP_N]], label [[FOR_END]], label [[SCALAR_PH]]
-; AVX512:       scalar.ph:
-; AVX512-NEXT:    [[BC_RESUME_VAL:%.*]] = phi float* [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ [[PTR]], [[FOR_BODY_LR_PH]] ], [ [[PTR]], [[VECTOR_MEMCHECK]] ]
-; AVX512-NEXT:    [[BC_RESUME_VAL14:%.*]] = phi float* [ [[IND_END13]], [[MIDDLE_BLOCK]] ], [ [[DEST]], [[FOR_BODY_LR_PH]] ], [ [[DEST]], [[VECTOR_MEMCHECK]] ]
+; AVX512-NEXT:    br i1 [[CMP_N]], label [[FOR_END]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; AVX512:       vec.epilog.iter.check:
+; AVX512-NEXT:    [[TMP22:%.*]] = mul i64 [[N_VEC]], 16
+; AVX512-NEXT:    [[IND_END23:%.*]] = getelementptr float, float* [[DEST]], i64 [[TMP22]]
+; AVX512-NEXT:    [[IND_END20:%.*]] = getelementptr float, float* [[PTR]], i64 [[N_VEC]]
+; AVX512-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[TMP3]], [[N_VEC]]
+; AVX512-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 8
+; AVX512-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; AVX512:       vec.epilog.ph:
+; AVX512-NEXT:    [[BC_RESUME_VAL:%.*]] = phi float* [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[PTR]], [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; AVX512-NEXT:    [[BC_RESUME_VAL16:%.*]] = phi float* [ [[IND_END15]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[DEST]], [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; AVX512-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; AVX512-NEXT:    [[N_MOD_VF17:%.*]] = urem i64 [[TMP3]], 8
+; AVX512-NEXT:    [[N_VEC18:%.*]] = sub i64 [[TMP3]], [[N_MOD_VF17]]
+; AVX512-NEXT:    [[IND_END19:%.*]] = getelementptr float, float* [[PTR]], i64 [[N_VEC18]]
+; AVX512-NEXT:    [[TMP23:%.*]] = mul i64 [[N_VEC18]], 16
+; AVX512-NEXT:    [[IND_END22:%.*]] = getelementptr float, float* [[DEST]], i64 [[TMP23]]
+; AVX512-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; AVX512:       vec.epilog.vector.body:
+; AVX512-NEXT:    [[POINTER_PHI28:%.*]] = phi float* [ [[BC_RESUME_VAL16]], [[VEC_EPILOG_PH]] ], [ [[PTR_IND29:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; AVX512-NEXT:    [[INDEX26:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT32:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; AVX512-NEXT:    [[TMP24:%.*]] = add i64 [[INDEX26]], 0
+; AVX512-NEXT:    [[NEXT_GEP27:%.*]] = getelementptr float, float* [[PTR]], i64 [[TMP24]]
+; AVX512-NEXT:    [[TMP25:%.*]] = getelementptr float, float* [[POINTER_PHI28]], <8 x i64> <i64 0, i64 16, i64 32, i64 48, i64 64, i64 80, i64 96, i64 112>
+; AVX512-NEXT:    [[TMP26:%.*]] = getelementptr inbounds float, float* [[NEXT_GEP27]], i64 [[IDXPROM]]
+; AVX512-NEXT:    [[TMP27:%.*]] = getelementptr inbounds float, float* [[TMP26]], i32 0
+; AVX512-NEXT:    [[TMP28:%.*]] = bitcast float* [[TMP27]] to <8 x float>*
+; AVX512-NEXT:    [[WIDE_LOAD30:%.*]] = load <8 x float>, <8 x float>* [[TMP28]], align 4, !alias.scope !23
+; AVX512-NEXT:    call void @llvm.masked.scatter.v8f32.v8p0f32(<8 x float> [[WIDE_LOAD30]], <8 x float*> [[TMP25]], i32 4, <8 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>), !alias.scope !26, !noalias !28
+; AVX512-NEXT:    [[TMP29:%.*]] = getelementptr float, float* [[NEXT_GEP27]], i32 0
+; AVX512-NEXT:    [[TMP30:%.*]] = bitcast float* [[TMP29]] to <8 x float>*
+; AVX512-NEXT:    [[WIDE_LOAD31:%.*]] = load <8 x float>, <8 x float>* [[TMP30]], align 4, !alias.scope !30
+; AVX512-NEXT:    [[TMP31:%.*]] = getelementptr inbounds float, <8 x float*> [[TMP25]], i64 1
+; AVX512-NEXT:    call void @llvm.masked.scatter.v8f32.v8p0f32(<8 x float> [[WIDE_LOAD31]], <8 x float*> [[TMP31]], i32 4, <8 x i1> <i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true, i1 true>), !alias.scope !26, !noalias !28
+; AVX512-NEXT:    [[INDEX_NEXT32]] = add nuw i64 [[INDEX26]], 8
+; AVX512-NEXT:    [[PTR_IND29]] = getelementptr float, float* [[POINTER_PHI28]], i64 128
+; AVX512-NEXT:    [[TMP32:%.*]] = icmp eq i64 [[INDEX_NEXT32]], [[N_VEC18]]
+; AVX512-NEXT:    br i1 [[TMP32]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP31:![0-9]+]]
+; AVX512:       vec.epilog.middle.block:
+; AVX512-NEXT:    [[CMP_N25:%.*]] = icmp eq i64 [[TMP3]], [[N_VEC18]]
+; AVX512-NEXT:    br i1 [[CMP_N25]], label [[FOR_END]], label [[VEC_EPILOG_SCALAR_PH]]
+; AVX512:       vec.epilog.scalar.ph:
+; AVX512-NEXT:    [[BC_RESUME_VAL21:%.*]] = phi float* [ [[IND_END19]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END20]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[PTR]], [[VECTOR_MEMCHECK]] ], [ [[PTR]], [[ITER_CHECK]] ]
+; AVX512-NEXT:    [[BC_RESUME_VAL24:%.*]] = phi float* [ [[IND_END22]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END23]], [[VEC_EPILOG_ITER_CHECK]] ], [ [[DEST]], [[VECTOR_MEMCHECK]] ], [ [[DEST]], [[ITER_CHECK]] ]
 ; AVX512-NEXT:    br label [[FOR_BODY:%.*]]
 ; AVX512:       for.body:
-; AVX512-NEXT:    [[PTR_ADDR_012:%.*]] = phi float* [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ]
-; AVX512-NEXT:    [[DEST_ADDR_011:%.*]] = phi float* [ [[BC_RESUME_VAL14]], [[SCALAR_PH]] ], [ [[ADD_PTR6:%.*]], [[FOR_BODY]] ]
+; AVX512-NEXT:    [[PTR_ADDR_012:%.*]] = phi float* [ [[BC_RESUME_VAL21]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ]
+; AVX512-NEXT:    [[DEST_ADDR_011:%.*]] = phi float* [ [[BC_RESUME_VAL24]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[ADD_PTR6:%.*]], [[FOR_BODY]] ]
 ; AVX512-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, float* [[PTR_ADDR_012]], i64 [[IDXPROM]]
-; AVX512-NEXT:    [[TMP22:%.*]] = load float, float* [[ARRAYIDX]], align 4
-; AVX512-NEXT:    store float [[TMP22]], float* [[DEST_ADDR_011]], align 4
-; AVX512-NEXT:    [[TMP23:%.*]] = load float, float* [[PTR_ADDR_012]], align 4
+; AVX512-NEXT:    [[TMP33:%.*]] = load float, float* [[ARRAYIDX]], align 4
+; AVX512-NEXT:    store float [[TMP33]], float* [[DEST_ADDR_011]], align 4
+; AVX512-NEXT:    [[TMP34:%.*]] = load float, float* [[PTR_ADDR_012]], align 4
 ; AVX512-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds float, float* [[DEST_ADDR_011]], i64 1
-; AVX512-NEXT:    store float [[TMP23]], float* [[ARRAYIDX5]], align 4
+; AVX512-NEXT:    store float [[TMP34]], float* [[ARRAYIDX5]], align 4
 ; AVX512-NEXT:    [[INCDEC_PTR]] = getelementptr inbounds float, float* [[PTR_ADDR_012]], i64 1
 ; AVX512-NEXT:    [[ADD_PTR6]] = getelementptr inbounds float, float* [[DEST_ADDR_011]], i64 16
 ; AVX512-NEXT:    [[CMP_NOT:%.*]] = icmp eq float* [[INCDEC_PTR]], [[ADD_PTR]]
-; AVX512-NEXT:    br i1 [[CMP_NOT]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP23:![0-9]+]]
+; AVX512-NEXT:    br i1 [[CMP_NOT]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP32:![0-9]+]]
 ; AVX512:       for.end:
 ; AVX512-NEXT:    ret void
 ;
 ; FVW2-LABEL: @test_gather_not_profitable_pr48429(
 ; FVW2-NEXT:  entry:
 ; FVW2-NEXT:    [[DEST1:%.*]] = bitcast float* [[DEST:%.*]] to i8*
 ; FVW2-NEXT:    [[PTR3:%.*]] = bitcast float* [[PTR:%.*]] to i8*
 ; FVW2-NEXT:    [[IDX_EXT:%.*]] = sext i32 [[D:%.*]] to i64

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization-limitations.ll

 ; REQUIRES: asserts
 ; RUN: opt < %s -passes='loop-vectorize' -force-vector-width=2 -enable-epilogue-vectorization -epilogue-vectorization-force-VF=2 --debug-only=loop-vectorize -S 2>&1 | FileCheck %s
 
 target datalayout = "e-m:e-i64:64-n32:64-v256:256:256-v512:512:512"
 
 ; Currently we cannot handle live-out variables that are recurrences.
 ; CHECK: LV: Checking a loop in 'f2'
 ; CHECK: LEV: Unable to vectorize epilogue because the loop is not a supported candidate.
 
 define signext i32 @f2(ptr noalias %A, i32 signext %n) {
 entry:
   %cmp1 = icmp sgt i32 %n, 0
   br i1 %cmp1, label %for.body.preheader, label %for.end
 
 for.body.preheader:                               ; preds = %entry
   %wide.trip.count = zext i32 %n to i64
   br label %for.body
 
 for.body:                                         ; preds = %for.body.preheader, %for.body

 for.end.loopexit:                                 ; preds = %for.body
   %inc.lcssa.wide = phi i64 [ %indvars.iv.next, %for.body ]
   %1 = trunc i64 %inc.lcssa.wide to i32
   br label %for.end
 
 for.end:                                          ; preds = %for.end.loopexit, %entry
   %i.0.lcssa = phi i32 [ 0, %entry ], [ %1, %for.end.loopexit ]
   ret i32 %i.0.lcssa
 }
-
-; Currently we cannot handle widended/truncated inductions.
-; CHECK: LV: Checking a loop in 'f3'
-; CHECK: LEV: Unable to vectorize epilogue because the loop is not a supported candidate.
-
-define void @f3(ptr noalias %A, i32 signext %n) {
-entry:
-  %cmp1 = icmp sgt i32 %n, 0
-  br i1 %cmp1, label %for.body.preheader, label %for.end
-
-for.body.preheader:                               ; preds = %entry
-  %wide.trip.count = zext i32 %n to i64
-  br label %for.body
-
-for.body:                                         ; preds = %for.body.preheader, %for.body
-  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
-  %0 = trunc i64 %indvars.iv to i32
-  %conv = trunc i32 %0 to i8
-  %arrayidx = getelementptr inbounds i8, ptr %A, i64 %indvars.iv
-  store i8 %conv, ptr %arrayidx, align 1
-  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
-  %exitcond = icmp ne i64 %indvars.iv.next, %wide.trip.count
-  br i1 %exitcond, label %for.body, label %for.end.loopexit
-
-for.end.loopexit:                                 ; preds = %for.body
-  br label %for.end
-
-for.end:                                          ; preds = %for.end.loopexit, %entry
-  ret void
-}

llvm/test/Transforms/LoopVectorize/optimal-epilog-vectorization.ll

 for.end:                                          ; preds = %for.end.loopexit, %entry
   ret void
 }
 
 ; Test case for PR54745.
 define void @induction_resume_value_requires_non_trivial_scev_expansion(ptr %dst) {
 ; CHECK-LABEL: @induction_resume_value_requires_non_trivial_scev_expansion(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    br label [[OUTER_HEADER:%.*]]
-; CHECK:       outer.header:
+; CHECK-NEXT:    br label [[ITER_CHECK:%.*]]
+; CHECK:       iter.check:
 ; CHECK-NEXT:    [[INDUCTION_IV:%.*]] = phi i8 [ [[INDUCTION_IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ], [ -56, [[ENTRY:%.*]] ]
 ; CHECK-NEXT:    [[INDVAR:%.*]] = phi i8 [ [[INDVAR_NEXT:%.*]], [[OUTER_LATCH]] ], [ 0, [[ENTRY]] ]
 ; CHECK-NEXT:    [[OUTER_IV:%.*]] = phi i64 [ 2, [[ENTRY]] ], [ [[OUTER_IV_NEXT:%.*]], [[OUTER_LATCH]] ]
 ; CHECK-NEXT:    [[P2:%.*]] = phi i32 [ -202, [[ENTRY]] ], [ [[ADD:%.*]], [[OUTER_LATCH]] ]
 ; CHECK-NEXT:    [[TMP0:%.*]] = mul i8 [[INDVAR]], -1
 ; CHECK-NEXT:    [[TMP1:%.*]] = add i8 [[TMP0]], -3
 ; CHECK-NEXT:    [[TRUNC_IV:%.*]] = trunc i64 [[OUTER_IV]] to i32
 ; CHECK-NEXT:    [[ADD]] = add i32 [[P2]], [[TRUNC_IV]]
 ; CHECK-NEXT:    [[TRUNC_ADD:%.*]] = trunc i32 [[ADD]] to i8
-; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    br i1 false, label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK:       vector.ph:
-; CHECK-NEXT:    [[IND_END:%.*]] = mul i8 84, [[INDUCTION_IV]]
 ; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <4 x i8> poison, i8 [[INDUCTION_IV]], i32 0
 ; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT]], <4 x i8> poison, <4 x i32> zeroinitializer
 ; CHECK-NEXT:    [[TMP2:%.*]] = mul <4 x i8> <i8 0, i8 1, i8 2, i8 3>, [[DOTSPLAT]]
 ; CHECK-NEXT:    [[INDUCTION:%.*]] = add <4 x i8> zeroinitializer, [[TMP2]]
 ; CHECK-NEXT:    [[TMP3:%.*]] = mul i8 [[INDUCTION_IV]], 4
-; CHECK-NEXT:    [[DOTSPLATINSERT2:%.*]] = insertelement <4 x i8> poison, i8 [[TMP3]], i32 0
-; CHECK-NEXT:    [[DOTSPLAT3:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT2]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[DOTSPLATINSERT1:%.*]] = insertelement <4 x i8> poison, i8 [[TMP3]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT2:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT1]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[IND_END:%.*]] = mul i8 84, [[INDUCTION_IV]]
 ; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK:       vector.body:
 ; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i8> [ [[INDUCTION]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]]
 ; CHECK-NEXT:    [[TMP4:%.*]] = add i64 [[OFFSET_IDX]], 0
 ; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i8, ptr [[DST:%.*]], i64 [[TMP4]]
 ; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i8, ptr [[TMP5]], i32 0
 ; CHECK-NEXT:    store <4 x i8> [[VEC_IND]], ptr [[TMP6]], align 1
 ; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
-; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i8> [[VEC_IND]], [[DOTSPLAT3]]
+; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i8> [[VEC_IND]], [[DOTSPLAT2]]
 ; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], 84
 ; CHECK-NEXT:    br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP11:![0-9]+]]
 ; CHECK:       middle.block:
 ; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 84, 84
-; CHECK-NEXT:    br i1 [[CMP_N]], label [[OUTER_LATCH]], label [[SCALAR_PH]]
-; CHECK:       scalar.ph:
-; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 85, [[MIDDLE_BLOCK]] ], [ 1, [[OUTER_HEADER]] ]
-; CHECK-NEXT:    [[BC_RESUME_VAL1:%.*]] = phi i8 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 0, [[OUTER_HEADER]] ]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[OUTER_LATCH]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    [[IND_END5:%.*]] = mul i8 84, [[INDUCTION_IV]]
+; CHECK-NEXT:    br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i8 [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ 84, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[IND_END4:%.*]] = mul i8 84, [[INDUCTION_IV]]
+; CHECK-NEXT:    [[DOTSPLATINSERT9:%.*]] = insertelement <4 x i8> poison, i8 [[BC_RESUME_VAL]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT10:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT9]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[DOTSPLATINSERT11:%.*]] = insertelement <4 x i8> poison, i8 [[INDUCTION_IV]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT12:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT11]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[TMP8:%.*]] = mul <4 x i8> <i8 0, i8 1, i8 2, i8 3>, [[DOTSPLAT12]]
+; CHECK-NEXT:    [[INDUCTION13:%.*]] = add <4 x i8> [[DOTSPLAT10]], [[TMP8]]
+; CHECK-NEXT:    [[TMP9:%.*]] = mul i8 [[INDUCTION_IV]], 4
+; CHECK-NEXT:    [[DOTSPLATINSERT14:%.*]] = insertelement <4 x i8> poison, i8 [[TMP9]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT15:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT14]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[INDEX8:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT19:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND16:%.*]] = phi <4 x i8> [ [[INDUCTION13]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT17:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[OFFSET_IDX18:%.*]] = add i64 1, [[INDEX8]]
+; CHECK-NEXT:    [[TMP10:%.*]] = add i64 [[OFFSET_IDX18]], 0
+; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 [[TMP10]]
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i8, ptr [[TMP11]], i32 0
+; CHECK-NEXT:    store <4 x i8> [[VEC_IND16]], ptr [[TMP12]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT19]] = add nuw i64 [[INDEX8]], 4
+; CHECK-NEXT:    [[VEC_IND_NEXT17]] = add <4 x i8> [[VEC_IND16]], [[DOTSPLAT15]]
+; CHECK-NEXT:    [[TMP13:%.*]] = icmp eq i64 [[INDEX_NEXT19]], 84
+; CHECK-NEXT:    br i1 [[TMP13]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP12:![0-9]+]]
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N7:%.*]] = icmp eq i64 84, 84
+; CHECK-NEXT:    br i1 [[CMP_N7]], label [[OUTER_LATCH]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL3:%.*]] = phi i64 [ 85, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 85, [[VEC_EPILOG_ITER_CHECK]] ], [ 1, [[ITER_CHECK]] ]
+; CHECK-NEXT:    [[BC_RESUME_VAL6:%.*]] = phi i8 [ [[IND_END4]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK]] ]
 ; CHECK-NEXT:    br label [[INNER:%.*]]
 ; CHECK:       inner:
-; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[INNER]] ]
-; CHECK-NEXT:    [[IV_2:%.*]] = phi i8 [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ], [ [[IV_2_NEXT:%.*]], [[INNER]] ]
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL3]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[INNER]] ]
+; CHECK-NEXT:    [[IV_2:%.*]] = phi i8 [ [[BC_RESUME_VAL6]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_2_NEXT:%.*]], [[INNER]] ]
 ; CHECK-NEXT:    [[IV_2_NEXT]] = sub i8 [[IV_2]], [[TRUNC_ADD]]
 ; CHECK-NEXT:    [[GEP_DST:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 [[IV]]
 ; CHECK-NEXT:    store i8 [[IV_2]], ptr [[GEP_DST]], align 1
 ; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
 ; CHECK-NEXT:    [[EC:%.*]] = icmp ugt i64 [[IV]], 83
-; CHECK-NEXT:    br i1 [[EC]], label [[OUTER_LATCH]], label [[INNER]], !llvm.loop [[LOOP12:![0-9]+]]
+; CHECK-NEXT:    br i1 [[EC]], label [[OUTER_LATCH]], label [[INNER]], !llvm.loop [[LOOP13:![0-9]+]]
 ; CHECK:       outer.latch:
 ; CHECK-NEXT:    [[OUTER_IV_NEXT]] = add nuw nsw i64 [[OUTER_IV]], 1
 ; CHECK-NEXT:    [[INDVAR_NEXT]] = add i8 [[INDVAR]], 1
 ; CHECK-NEXT:    [[INDUCTION_IV_NEXT]] = add i8 [[INDUCTION_IV]], [[TMP1]]
-; CHECK-NEXT:    br label [[OUTER_HEADER]]
+; CHECK-NEXT:    br label [[ITER_CHECK]]
 ;
 ; CHECK-PROFITABLE-BY-DEFAULT-LABEL: @induction_resume_value_requires_non_trivial_scev_expansion(
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:  entry:
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[OUTER_HEADER:%.*]]
-; CHECK-PROFITABLE-BY-DEFAULT:       outer.header:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[ITER_CHECK:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       iter.check:
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDUCTION_IV:%.*]] = phi i8 [ [[INDUCTION_IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ], [ -56, [[ENTRY:%.*]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDVAR:%.*]] = phi i8 [ [[INDVAR_NEXT:%.*]], [[OUTER_LATCH]] ], [ 0, [[ENTRY]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[OUTER_IV:%.*]] = phi i64 [ 2, [[ENTRY]] ], [ [[OUTER_IV_NEXT:%.*]], [[OUTER_LATCH]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[P2:%.*]] = phi i32 [ -202, [[ENTRY]] ], [ [[ADD:%.*]], [[OUTER_LATCH]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP0:%.*]] = mul i8 [[INDVAR]], -1
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP1:%.*]] = add i8 [[TMP0]], -3
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TRUNC_IV:%.*]] = trunc i64 [[OUTER_IV]] to i32
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[ADD]] = add i32 [[P2]], [[TRUNC_IV]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TRUNC_ADD:%.*]] = trunc i32 [[ADD]] to i8
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 false, label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vector.main.loop.iter.check:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 false, label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
 ; CHECK-PROFITABLE-BY-DEFAULT:       vector.ph:
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IND_END:%.*]] = mul i8 84, [[INDUCTION_IV]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <4 x i8> poison, i8 [[INDUCTION_IV]], i32 0
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT]], <4 x i8> poison, <4 x i32> zeroinitializer
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP2:%.*]] = mul <4 x i8> <i8 0, i8 1, i8 2, i8 3>, [[DOTSPLAT]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDUCTION:%.*]] = add <4 x i8> zeroinitializer, [[TMP2]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP3:%.*]] = mul i8 [[INDUCTION_IV]], 4
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT2:%.*]] = insertelement <4 x i8> poison, i8 [[TMP3]], i32 0
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT3:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT2]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT1:%.*]] = insertelement <4 x i8> poison, i8 [[TMP3]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT2:%.*]] = shufflevector <4 x i8> [[DOTSPLATINSERT1]], <4 x i8> poison, <4 x i32> zeroinitializer
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IND_END:%.*]] = mul i8 84, [[INDUCTION_IV]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[VECTOR_BODY:%.*]]
 ; CHECK-PROFITABLE-BY-DEFAULT:       vector.body:
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND:%.*]] = phi <4 x i8> [ [[INDUCTION]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP4:%.*]] = add i64 [[OFFSET_IDX]], 0
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i8, ptr [[DST:%.*]], i64 [[TMP4]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i8, ptr [[TMP5]], i32 0
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    store <4 x i8> [[VEC_IND]], ptr [[TMP6]], align 1
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND_NEXT]] = add <4 x i8> [[VEC_IND]], [[DOTSPLAT3]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND_NEXT]] = add <4 x i8> [[VEC_IND]], [[DOTSPLAT2]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], 84
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
 ; CHECK-PROFITABLE-BY-DEFAULT:       middle.block:
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[CMP_N:%.*]] = icmp eq i64 84, 84
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[CMP_N]], label [[OUTER_LATCH]], label [[SCALAR_PH]]
-; CHECK-PROFITABLE-BY-DEFAULT:       scalar.ph:
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 85, [[MIDDLE_BLOCK]] ], [ 1, [[OUTER_HEADER]] ]
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL1:%.*]] = phi i8 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 0, [[OUTER_HEADER]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[CMP_N]], label [[OUTER_LATCH]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.iter.check:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IND_END5:%.*]] = mul i8 84, [[INDUCTION_IV]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 true, label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.ph:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i8 [ [[IND_END]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ 84, [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IND_END4:%.*]] = mul i8 84, [[INDUCTION_IV]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT9:%.*]] = insertelement <2 x i8> poison, i8 [[BC_RESUME_VAL]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT10:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT9]], <2 x i8> poison, <2 x i32> zeroinitializer
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT11:%.*]] = insertelement <2 x i8> poison, i8 [[INDUCTION_IV]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT12:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT11]], <2 x i8> poison, <2 x i32> zeroinitializer
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP8:%.*]] = mul <2 x i8> <i8 0, i8 1>, [[DOTSPLAT12]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDUCTION13:%.*]] = add <2 x i8> [[DOTSPLAT10]], [[TMP8]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP9:%.*]] = mul i8 [[INDUCTION_IV]], 2
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT14:%.*]] = insertelement <2 x i8> poison, i8 [[TMP9]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT15:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT14]], <2 x i8> poison, <2 x i32> zeroinitializer
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.vector.body:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX8:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT19:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND16:%.*]] = phi <2 x i8> [ [[INDUCTION13]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT17:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[OFFSET_IDX18:%.*]] = add i64 1, [[INDEX8]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP10:%.*]] = add i64 [[OFFSET_IDX18]], 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP11:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 [[TMP10]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP12:%.*]] = getelementptr inbounds i8, ptr [[TMP11]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    store <2 x i8> [[VEC_IND16]], ptr [[TMP12]], align 1
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX_NEXT19]] = add nuw i64 [[INDEX8]], 2
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND_NEXT17]] = add <2 x i8> [[VEC_IND16]], [[DOTSPLAT15]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP13:%.*]] = icmp eq i64 [[INDEX_NEXT19]], 84
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[TMP13]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.middle.block:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[CMP_N7:%.*]] = icmp eq i64 84, 84
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[CMP_N7]], label [[OUTER_LATCH]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.scalar.ph:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL3:%.*]] = phi i64 [ 85, [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ 85, [[VEC_EPILOG_ITER_CHECK]] ], [ 1, [[ITER_CHECK]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL6:%.*]] = phi i8 [ [[IND_END4]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[IND_END5]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[INNER:%.*]]
 ; CHECK-PROFITABLE-BY-DEFAULT:       inner:
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[INNER]] ]
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV_2:%.*]] = phi i8 [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ], [ [[IV_2_NEXT:%.*]], [[INNER]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL3]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[INNER]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV_2:%.*]] = phi i8 [ [[BC_RESUME_VAL6]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_2_NEXT:%.*]], [[INNER]] ]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV_2_NEXT]] = sub i8 [[IV_2]], [[TRUNC_ADD]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[GEP_DST:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 [[IV]]
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    store i8 [[IV_2]], ptr [[GEP_DST]], align 1
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[EC:%.*]] = icmp ugt i64 [[IV]], 83
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[EC]], label [[OUTER_LATCH]], label [[INNER]], !llvm.loop [[LOOP6:![0-9]+]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[EC]], label [[OUTER_LATCH]], label [[INNER]], !llvm.loop [[LOOP7:![0-9]+]]
 ; CHECK-PROFITABLE-BY-DEFAULT:       outer.latch:
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[OUTER_IV_NEXT]] = add nuw nsw i64 [[OUTER_IV]], 1
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDVAR_NEXT]] = add i8 [[INDVAR]], 1
 ; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDUCTION_IV_NEXT]] = add i8 [[INDUCTION_IV]], [[TMP1]]
-; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[OUTER_HEADER]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[ITER_CHECK]]
 ;
 entry:
   br label %outer.header
 
 outer.header:
   %outer.iv = phi i64 [ 2, %entry ], [ %outer.iv.next, %outer.latch ]
   %p2 = phi i32 [ -202, %entry ], [ %add, %outer.latch ]
   %trunc.iv  = trunc i64 %outer.iv to i32
inner:
   %iv.next = add nuw nsw i64 %iv, 1
   %ec = icmp ugt i64 %iv, 83
   br i1 %ec, label %outer.latch, label %inner
 
 outer.latch:
   %outer.iv.next = add nuw nsw i64 %outer.iv, 1
   br label %outer.header
 }
+
+; Check handling of widended/truncated inductions.
+define void @f4(ptr noalias %A, i32 signext %n) {
+; CHECK-LABEL: @f4(
+; CHECK-NEXT:  iter.check:
+; CHECK-NEXT:    [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[N:%.*]] to i64
+; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK:       vector.main.loop.iter.check:
+; CHECK-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], 4
+; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK:       vector.ph:
+; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], 4
+; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF]]
+; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <4 x i32> [[VEC_IND]] to <4 x i8>
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i32 0
+; CHECK-NEXT:    store <4 x i8> [[TMP1]], ptr [[TMP3]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT:    [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], <i32 4, i32 4, i32 4, i32 4>
+; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP14:![0-9]+]]
+; CHECK:       middle.block:
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK:       vec.epilog.iter.check:
+; CHECK-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 4
+; CHECK-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK:       vec.epilog.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-NEXT:    [[N_MOD_VF2:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], 4
+; CHECK-NEXT:    [[N_VEC3:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF2]]
+; CHECK-NEXT:    [[TMP5:%.*]] = trunc i64 [[BC_RESUME_VAL]] to i32
+; CHECK-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TMP5]], i32 0
+; CHECK-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <4 x i32> [[DOTSPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT:    [[INDUCTION:%.*]] = add <4 x i32> [[DOTSPLAT]], <i32 0, i32 1, i32 2, i32 3>
+; CHECK-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK:       vec.epilog.vector.body:
+; CHECK-NEXT:    [[INDEX6:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT9:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[VEC_IND7:%.*]] = phi <4 x i32> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT8:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-NEXT:    [[TMP6:%.*]] = add i64 [[INDEX6]], 0
+; CHECK-NEXT:    [[TMP7:%.*]] = trunc <4 x i32> [[VEC_IND7]] to <4 x i8>
+; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[TMP6]]
+; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i8, ptr [[TMP8]], i32 0
+; CHECK-NEXT:    store <4 x i8> [[TMP7]], ptr [[TMP9]], align 1
+; CHECK-NEXT:    [[INDEX_NEXT9]] = add nuw i64 [[INDEX6]], 4
+; CHECK-NEXT:    [[VEC_IND_NEXT8]] = add <4 x i32> [[VEC_IND7]], <i32 4, i32 4, i32 4, i32 4>
+; CHECK-NEXT:    [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT9]], [[N_VEC3]]
+; CHECK-NEXT:    br i1 [[TMP10]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP15:![0-9]+]]
+; CHECK:       vec.epilog.middle.block:
+; CHECK-NEXT:    [[CMP_N5:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC3]]
+; CHECK-NEXT:    br i1 [[CMP_N5]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK:       vec.epilog.scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL4:%.*]] = phi i64 [ [[N_VEC3]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL4]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-NEXT:    [[TMP11:%.*]] = trunc i64 [[IV]] to i32
+; CHECK-NEXT:    [[CONV:%.*]] = trunc i32 [[TMP11]] to i8
+; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
+; CHECK-NEXT:    store i8 [[CONV]], ptr [[ARRAYIDX]], align 1
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
+; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], [[WIDE_TRIP_COUNT]]
+; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT]], !llvm.loop [[LOOP16:![0-9]+]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+; CHECK-PROFITABLE-BY-DEFAULT-LABEL: @f4(
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:  iter.check:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[N:%.*]] to i64
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], 2
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH:%.*]], label [[VECTOR_MAIN_LOOP_ITER_CHECK:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vector.main.loop.iter.check:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[MIN_ITERS_CHECK1:%.*]] = icmp ult i64 [[WIDE_TRIP_COUNT]], 4
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[MIN_ITERS_CHECK1]], label [[VEC_EPILOG_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vector.ph:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], 4
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[N_VEC:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[VECTOR_BODY:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vector.body:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP1:%.*]] = trunc <4 x i32> [[VEC_IND]] to <4 x i8>
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i64 [[TMP0]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i8, ptr [[TMP2]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    store <4 x i8> [[TMP1]], ptr [[TMP3]], align 1
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], <i32 4, i32 4, i32 4, i32 4>
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
+; CHECK-PROFITABLE-BY-DEFAULT:       middle.block:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[VEC_EPILOG_ITER_CHECK:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.iter.check:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[N_VEC_REMAINING:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_VEC]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[MIN_EPILOG_ITERS_CHECK:%.*]] = icmp ult i64 [[N_VEC_REMAINING]], 2
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[MIN_EPILOG_ITERS_CHECK]], label [[VEC_EPILOG_SCALAR_PH]], label [[VEC_EPILOG_PH]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.ph:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_EPILOG_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[VECTOR_MAIN_LOOP_ITER_CHECK]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[N_MOD_VF2:%.*]] = urem i64 [[WIDE_TRIP_COUNT]], 2
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[N_VEC3:%.*]] = sub i64 [[WIDE_TRIP_COUNT]], [[N_MOD_VF2]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP5:%.*]] = trunc i64 [[BC_RESUME_VAL]] to i32
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLATINSERT:%.*]] = insertelement <2 x i32> poison, i32 [[TMP5]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[DOTSPLAT:%.*]] = shufflevector <2 x i32> [[DOTSPLATINSERT]], <2 x i32> poison, <2 x i32> zeroinitializer
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDUCTION:%.*]] = add <2 x i32> [[DOTSPLAT]], <i32 0, i32 1>
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.vector.body:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX6:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT9:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND7:%.*]] = phi <2 x i32> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT8:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP6:%.*]] = add i64 [[INDEX6]], 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP7:%.*]] = trunc <2 x i32> [[VEC_IND7]] to <2 x i8>
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP8:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[TMP6]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP9:%.*]] = getelementptr inbounds i8, ptr [[TMP8]], i32 0
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    store <2 x i8> [[TMP7]], ptr [[TMP9]], align 1
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[INDEX_NEXT9]] = add nuw i64 [[INDEX6]], 2
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[VEC_IND_NEXT8]] = add <2 x i32> [[VEC_IND7]], <i32 2, i32 2>
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT9]], [[N_VEC3]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[TMP10]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], !llvm.loop [[LOOP9:![0-9]+]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.middle.block:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[CMP_N5:%.*]] = icmp eq i64 [[WIDE_TRIP_COUNT]], [[N_VEC3]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[CMP_N5]], label [[EXIT]], label [[VEC_EPILOG_SCALAR_PH]]
+; CHECK-PROFITABLE-BY-DEFAULT:       vec.epilog.scalar.ph:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[BC_RESUME_VAL4:%.*]] = phi i64 [ [[N_VEC3]], [[VEC_EPILOG_MIDDLE_BLOCK]] ], [ [[N_VEC]], [[VEC_EPILOG_ITER_CHECK]] ], [ 0, [[ITER_CHECK:%.*]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br label [[LOOP:%.*]]
+; CHECK-PROFITABLE-BY-DEFAULT:       loop:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL4]], [[VEC_EPILOG_SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[TMP11:%.*]] = trunc i64 [[IV]] to i32
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[CONV:%.*]] = trunc i32 [[TMP11]] to i8
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[IV]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    store i8 [[CONV]], ptr [[ARRAYIDX]], align 1
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[IV_NEXT]], [[WIDE_TRIP_COUNT]]
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT]], !llvm.loop [[LOOP10:![0-9]+]]
+; CHECK-PROFITABLE-BY-DEFAULT:       exit:
+; CHECK-PROFITABLE-BY-DEFAULT-NEXT:    ret void
+;
+entry:
+  %wide.trip.count = zext i32 %n to i64
+  br label %loop
+
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+  %0 = trunc i64 %iv to i32
+  %conv = trunc i32 %0 to i8
+  %arrayidx = getelementptr inbounds i8, ptr %A, i64 %iv
+  store i8 %conv, ptr %arrayidx, align 1
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond = icmp ne i64 %iv.next, %wide.trip.count
+  br i1 %exitcond, label %loop, label %exit
+
+exit:
+  ret void
+}