[VPlan] Replace CondBit with BranchOnCond VPInstruction.

[fhahn]

Summary

This patch removes CondBit and Predicate from VPBasicBlock. To do so,
the patch introduces a new branch-on-cond VPInstruction opcode to model
a branch on a condition explicitly.

This addresses a long-standing TODO/FIXME that blocks shouldn't be users
of VPValues. Those extra users can cause issues for VPValue-based
analyses that don't expect blocks. Addressing this fixme should allow us
to re-introduce 266ea446ab7476.

The generic branch opcode can also be used in follow-up patches.

Depends on D123005.

[Ayal]

Should tests check for new BranchOnCond VPInstruction?

Are the users of CondBit/Predicate ok w/ this change (VPlanPredicator)?

llvm/lib/Transforms/Vectorize/VPlan.cpp

760

Similar to VPBranchOnMaskRecipe (have all terminator recipes share this somehow?):

// Replace the temporary unreachable terminator with a new conditional branch,
// hooking it up to backward destination now and to forward destination(s) later when they are created.

Handle loop branches of all loops, not only outermost?

Set exit successor to nullptr to be set later, rather than Builder.GetInsertBlock()?

llvm/lib/Transforms/Vectorize/VPlan.h

548–549

Update comment.

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

60

May be useful to have an isaTerminator(Recipe).

Can have VPBB hold its 'singleton' terminator recipe (instead of CondBit) separately from all other recipes, analogous to the idea for Region to hold its singleton canonical IV recipe directly.

[fhahn]

Address latest comments, thanks!

In D126618#3544964, @Ayal wrote:

Should tests check for new BranchOnCond VPInstruction?

There's Transforms/LoopVectorize/vplan-printing-outer-loop.ll now, which tests this.

Are the users of CondBit/Predicate ok w/ this change (VPlanPredicator)?

There are no remaining users after this change. VPlanPredicator at the current stage is not used and would need major updates to support the new region structure. There's D123017 to remove it, which has been approved and I plan to land this soon, ideally once D123005 is ready/

[fhahn]

llvm/lib/Transforms/Vectorize/VPlan.cpp

760

Similar to VPBranchOnMaskRecipe (have all terminator recipes share this somehow?):

Not sure how to best do this at the moment. Might be worth introducing a dedicated terminator subclass once things settle down a bit?

Handle loop branches of all loops, not only outermost?

Done, removed the VPlan native code and also use parent region rather than topmost.

Set exit successor to nullptr to be set later, rather than Builder.GetInsertBlock()?

Done, thanks!

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

60

I added a VPBasicBlock::getTerminator() helper. Not sure if it is worth adding state to track the terminator, as it is trivial to access them for now.

[fhahn]

Remove a bit of unneeded code to hook up to ExitBB.

[Ayal]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

8513

nit, unrelated to this patch: should this Exit also be Exiting?

8669

Seems somewhat awkward for addCanonicalIVRecipes() to take care of erasing a redundant terminator; could this cleanup take place when VPlanNative creates said terminator, before it calls addCanonicalIVRecipes()?

llvm/lib/Transforms/Vectorize/VPlan.cpp

389

VPBB's w/o successors - must not be empty?

401

Should some 'isLatch()' check if a VPBB is exiting its enclosing loop region?

750

When is this called? Expecting Predication to replace forward BranchOnCond by Blend or BranchOnMask's for UF>1 and/or VF>1, and backward BranchOnCond to be replaced by BranchOnCount?

Assert here that Part==0?

759

If isLatch()?
Have separate VPInstructions for forward and backward/loop-latch branches?

760

Similar to VPBranchOnMaskRecipe (have all terminator recipes share this somehow?):

Not sure how to best do this at the moment. Might be worth introducing a dedicated terminator subclass once things settle down a bit?

Sure; perhaps convert VPBranchOnMaskRecipe to VPInstruction, thereby having an opcode interval for terminating branch VPInstructions, in a follow-up patch.

764

nit: can remove {}'s

llvm/lib/Transforms/Vectorize/VPlan.h

2034

or if there are no successors

llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp

222

Should BranchOnCond be created here instead of below in buildPlainCFG()?
Comment deserves updating.

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

34

Why is this change needed now?

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

60

Sure, also follows LLVM-IR, except that successors are held in VPBB and their order must match the direction dictated by CondBit of BranchOnCond.

[fhahn]

Address latest comments, thanks!

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

8513

Updated in 08482830eb8a.

8669

I tried remove this when building the native plan, but this leaves the plan in an inconsistent state (exiting block without cond terminator) which triggers asserts with getTerminator calls. I move the code to remove it to the caller of this function.

llvm/lib/Transforms/Vectorize/VPlan.cpp

389

I think in theory it could be possible in native path, at least I don't think that's an enforced invariant?

401

Thanks, I added an isExiting helper, which might be a bit more descriptive and more in-line with the naming for the other helpers.

750

It is called for different parts, but everything worked because it always removed the previous terminator. Updated to break on part != 0.

759

Updated to use isExiting. I'm not sure if there's any benefit at the moment to introduce different recipes.

764

Removed, thanks!

llvm/lib/Transforms/Vectorize/VPlan.h

2034

Adjusted, thanks!

llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp

222

Moved, thanks!

I also updated the comment.

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

34

BranchOnCount are VPInstructions without underlying values. I updated the code to just skip terminators.

[Ayal]

This looks good to me, thanks!
Adding minor nits.

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

8669

This is fine, thanks.

Perhaps native should addCanonicalIVRecipes from within its VPInstructionsToVPRecipes.

llvm/lib/Transforms/Vectorize/VPlan.cpp

389

Relax assert to check for no more than a single successor?

427

Does 'exiting' here refer to loop-exiting/latch or to region-exiting? I.e., are replicating region exits included or excluded.

750

ok, this implies condition must be uniform, may be good to assert so.

759

Ok. A thought to keep in mind.

llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp

314

w/o the using condition bit bit.

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

34

Ahh, fine, very good.

nit: there's not much to continue after reaching the terminator; can iterate excluding terminator similar to excluding phi's.

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

54

|| isExiting(VPB)?

[fhahn]

In D126618#3552715, @Ayal wrote:

This looks good to me, thanks!
Adding minor nits.

Thanks. Addressed the latest comments and I am planning on landing this soon.

[fhahn]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

8669

Will do as follow-up!

llvm/lib/Transforms/Vectorize/VPlan.cpp

389

Yes, adjusted!

427

The current version just checks for exiting of a region.

llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp

314

Updated, thanks!

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

34

Updated, thanks!

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

54

Updated thanks!

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

VPRegionBlock *VPRecipeBuilder::createReplicateRegion(Instruction *Instr,
   auto *Entry = new VPBasicBlock(Twine(RegionName) + ".entry", BOMRecipe);
   auto *PHIRecipe = Instr->getType()->isVoidTy()
                         ? nullptr
                         : new VPPredInstPHIRecipe(Plan->getOrAddVPValue(Instr));
   if (PHIRecipe) {
     Plan->removeVPValueFor(Instr);
     Plan->addVPValue(Instr, PHIRecipe);
   }
   auto *Exit = new VPBasicBlock(Twine(RegionName) + ".continue", PHIRecipe);
   auto *Pred = new VPBasicBlock(Twine(RegionName) + ".if", PredRecipe);
   VPRegionBlock *Region = new VPRegionBlock(Entry, Exit, RegionName, true);
 
   // Note: first set Entry as region entry and then connect successors starting
   // from it in order, to propagate the "parent" of each VPBasicBlock.
-  VPBlockUtils::insertTwoBlocksAfter(Pred, Exit, BlockInMask, Entry);
+  VPBlockUtils::insertTwoBlocksAfter(Pred, Exit, Entry);
   VPBlockUtils::connectBlocks(Pred, Exit);
 
   return Region;
 }
 
 VPRecipeOrVPValueTy
 VPRecipeBuilder::tryToCreateWidenRecipe(Instruction *Instr,
                                         ArrayRef<VPValue *> Operands,
static void addCanonicalIVRecipes(VPlan &Plan, Type *IdxTy, DebugLoc DL,
   auto *CanonicalIVIncrement =
       new VPInstruction(HasNUW ? VPInstruction::CanonicalIVIncrementNUW
                                : VPInstruction::CanonicalIVIncrement,
                         {CanonicalIVPHI}, DL);
   CanonicalIVPHI->addOperand(CanonicalIVIncrement);
 
   VPBasicBlock *EB = TopRegion->getExitingBasicBlock();
   if (IsVPlanNative)
-    EB->setCondBit(nullptr);
+    EB->back().eraseFromParent();
   EB->appendRecipe(CanonicalIVIncrement);
 
   auto *BranchOnCount =
       new VPInstruction(VPInstruction::BranchOnCount,
                         {CanonicalIVIncrement, &Plan.getVectorTripCount()}, DL);
   EB->appendRecipe(BranchOnCount);
 }
 

llvm/lib/Transforms/Vectorize/VPlan.h

struct VPTransformState {
   /// Holds recipes that may generate a poison value that is used after
   /// vectorization, even when their operands are not poison.
   SmallPtrSet<VPRecipeBase *, 16> MayGeneratePoisonRecipes;
 
   /// The loop object for the current parent region, or nullptr.
   Loop *CurrentVectorLoop = nullptr;
 };
 
-/// VPUsers instance used by VPBlockBase to manage CondBit and the block
-/// predicate. Currently VPBlockUsers are used in VPBlockBase for historical
-/// reasons, but in the future the only VPUsers should either be recipes or
-/// live-outs.VPBlockBase uses.
-struct VPBlockUser : public VPUser {
-  VPBlockUser() : VPUser({}, VPUserID::Block) {}
-
-  VPValue *getSingleOperandOrNull() {
-    if (getNumOperands() == 1)
-      return getOperand(0);
-
-    return nullptr;
-  }
-  const VPValue *getSingleOperandOrNull() const {
-    if (getNumOperands() == 1)
-      return getOperand(0);
-
-    return nullptr;
-  }
-
-  void resetSingleOpUser(VPValue *NewVal) {
-    assert(getNumOperands() <= 1 && "Didn't expect more than one operand!");
-    if (!NewVal) {
-      if (getNumOperands() == 1)
-        removeLastOperand();
-      return;
-    }
-
-    if (getNumOperands() == 1)
-      setOperand(0, NewVal);
-    else
-      addOperand(NewVal);
-  }
-};
-
 /// VPBlockBase is the building block of the Hierarchical Control-Flow Graph.
 /// A VPBlockBase can be either a VPBasicBlock or a VPRegionBlock.
 class VPBlockBase {
   friend class VPBlockUtils;
 
   const unsigned char SubclassID; ///< Subclass identifier (for isa/dyn_cast).
 
   /// An optional name for the block.
   std::string Name;
 
   /// The immediate VPRegionBlock which this VPBlockBase belongs to, or null if
   /// it is a topmost VPBlockBase.
   VPRegionBlock *Parent = nullptr;
 
   /// List of predecessor blocks.
   SmallVector<VPBlockBase *, 1> Predecessors;
 
   /// List of successor blocks.
   SmallVector<VPBlockBase *, 1> Successors;
 
-  /// Successor selector managed by a VPUser. For blocks with zero or one
-  /// successors, there is no operand. Otherwise there is exactly one operand
-  /// which is the branch condition.
-  VPBlockUser CondBitUser;
-
-  /// If the block is predicated, its predicate is stored as an operand of this
-  /// VPUser to maintain the def-use relations. Otherwise there is no operand
-  /// here.
-  VPBlockUser PredicateUser;
-
   /// VPlan containing the block. Can only be set on the entry block of the
   /// plan.
   VPlan *Plan = nullptr;
 
   /// Add \p Successor as the last successor to this block.
   void appendSuccessor(VPBlockBase *Successor) {
     assert(Successor && "Cannot add nullptr successor!");
     Successors.push_back(Successor);
public:
   }
 
   /// \return the hierarchical predecessor of this VPBlockBase if it has a
   /// single hierarchical predecessor. Otherwise return a null pointer.
   VPBlockBase *getSingleHierarchicalPredecessor() {
     return getEnclosingBlockWithPredecessors()->getSinglePredecessor();
   }
 
-  /// \return the condition bit selecting the successor.
-  VPValue *getCondBit();
-  /// \return the condition bit selecting the successor.
-  const VPValue *getCondBit() const;
-  /// Set the condition bit selecting the successor.
-  void setCondBit(VPValue *CV);
-
-  /// \return the block's predicate.
-  VPValue *getPredicate();
-  /// \return the block's predicate.
-  const VPValue *getPredicate() const;
-  /// Set the block's predicate.
-  void setPredicate(VPValue *Pred);
-
   /// Set a given VPBlockBase \p Successor as the single successor of this
   /// VPBlockBase. This VPBlockBase is not added as predecessor of \p Successor.
   /// This VPBlockBase must have no successors.
   void setOneSuccessor(VPBlockBase *Successor) {
     assert(Successors.empty() && "Setting one successor when others exist.");
     appendSuccessor(Successor);
   }
 
   /// Set two given VPBlockBases \p IfTrue and \p IfFalse to be the two
-  /// successors of this VPBlockBase. \p Condition is set as the successor
-  /// selector. This VPBlockBase is not added as predecessor of \p IfTrue or \p
-  /// IfFalse. This VPBlockBase must have no successors.
-  void setTwoSuccessors(VPBlockBase *IfTrue, VPBlockBase *IfFalse,
-                        VPValue *Condition) {
+  /// successors of this VPBlockBase. This VPBlockBase is not added as
+  /// predecessor of \p IfTrue or \p IfFalse. This VPBlockBase must have no
+  /// successors.
+  void setTwoSuccessors(VPBlockBase *IfTrue, VPBlockBase *IfFalse) {
     assert(Successors.empty() && "Setting two successors when others exist.");
-    assert(Condition && "Setting two successors without condition!");
-    setCondBit(Condition);
     appendSuccessor(IfTrue);
     appendSuccessor(IfFalse);
   }
 
   /// Set each VPBasicBlock in \p NewPreds as predecessor of this VPBlockBase.
   /// This VPBlockBase must have no predecessors. This VPBlockBase is not added
   /// as successor of any VPBasicBlock in \p NewPreds.
   void setPredecessors(ArrayRef<VPBlockBase *> NewPreds) {
     assert(Predecessors.empty() && "Block predecessors already set.");
     for (auto *Pred : NewPreds)
       appendPredecessor(Pred);
   }
 
   /// Remove all the predecessor of this block.
   void clearPredecessors() { Predecessors.clear(); }
 
-  /// Remove all the successors of this block and set to null its condition bit
-  void clearSuccessors() {
-    Successors.clear();
-    setCondBit(nullptr);
-  }
+  /// Remove all the successors of this block.
+  void clearSuccessors() { Successors.clear(); }
 
   /// The method which generates the output IR that correspond to this
   /// VPBlockBase, thereby "executing" the VPlan.
   virtual void execute(struct VPTransformState *State) = 0;
 
   /// Delete all blocks reachable from a given VPBlockBase, inclusive.
   static void deleteCFG(VPBlockBase *Entry);
 
enum {
     Not,
     ICmpULE,
     SLPLoad,
     SLPStore,
     ActiveLaneMask,
     CanonicalIVIncrement,
     CanonicalIVIncrementNUW,
     BranchOnCount,
+    BranchOnCond
   };
 
 private:
   typedef unsigned char OpcodeTy;
   OpcodeTy Opcode;
   FastMathFlags FMF;
   DebugLoc DL;
 
bool hasResult() const {
     case Instruction::Store:
     case Instruction::Switch:
     case Instruction::IndirectBr:
     case Instruction::Resume:
     case Instruction::CatchRet:
     case Instruction::Unreachable:
     case Instruction::Fence:
     case Instruction::AtomicRMW:
+    case VPInstruction::BranchOnCond:
     case VPInstruction::BranchOnCount:
       return false;
     default:
       return true;
     }
   }
 
   /// Set the fast-math flags.
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   ///
   /// Note that the numbering is applied to the whole VPlan, so printing
   /// individual blocks is consistent with the whole VPlan printing.
   void print(raw_ostream &O, const Twine &Indent,
              VPSlotTracker &SlotTracker) const override;
   using VPBlockBase::print; // Get the print(raw_stream &O) version.
 #endif
 
+  /// If the block has multiple successors, return the branch recipe terminating
+  /// the block. If there is only a single successor, return nullptr;
+  const VPRecipeBase *getTerminator() const;
+
 private:
   /// Create an IR BasicBlock to hold the output instructions generated by this
   /// VPBasicBlock, and return it. Update the CFGState accordingly.
   BasicBlock *createEmptyBasicBlock(VPTransformState::CFGState &CFG);
 };
 
 /// VPRegionBlock represents a collection of VPBasicBlocks and VPRegionBlocks
 /// which form a Single-Entry-Single-Exiting subgraph of the output IR CFG.

 /// Class that provides utilities for VPBlockBases in VPlan.
 class VPBlockUtils {
 public:
   VPBlockUtils() = delete;
 
   /// Insert disconnected VPBlockBase \p NewBlock after \p BlockPtr. Add \p
   /// NewBlock as successor of \p BlockPtr and \p BlockPtr as predecessor of \p
   /// NewBlock, and propagate \p BlockPtr parent to \p NewBlock. \p BlockPtr's
-  /// successors are moved from \p BlockPtr to \p NewBlock and \p BlockPtr's
-  /// conditional bit is propagated to \p NewBlock. \p NewBlock must have
-  /// neither successors nor predecessors.
+  /// successors are moved from \p BlockPtr to \p NewBlock. \p NewBlock must
+  /// have neither successors nor predecessors.
   static void insertBlockAfter(VPBlockBase *NewBlock, VPBlockBase *BlockPtr) {
     assert(NewBlock->getSuccessors().empty() &&
            NewBlock->getPredecessors().empty() &&
            "Can't insert new block with predecessors or successors.");
     NewBlock->setParent(BlockPtr->getParent());
     SmallVector<VPBlockBase *> Succs(BlockPtr->successors());
     for (VPBlockBase *Succ : Succs) {
       disconnectBlocks(BlockPtr, Succ);
       connectBlocks(NewBlock, Succ);
     }
-    NewBlock->setCondBit(BlockPtr->getCondBit());
-    BlockPtr->setCondBit(nullptr);
     connectBlocks(BlockPtr, NewBlock);
   }
 
   /// Insert disconnected VPBlockBases \p IfTrue and \p IfFalse after \p
   /// BlockPtr. Add \p IfTrue and \p IfFalse as succesors of \p BlockPtr and \p
   /// BlockPtr as predecessor of \p IfTrue and \p IfFalse. Propagate \p BlockPtr
-  /// parent to \p IfTrue and \p IfFalse. \p Condition is set as the successor
-  /// selector. \p BlockPtr must have no successors and \p IfTrue and \p IfFalse
-  /// must have neither successors nor predecessors.
+  /// parent to \p IfTrue and \p IfFalse. \p BlockPtr must have no successors
+  /// and \p IfTrue and \p IfFalse must have neither successors nor
+  /// predecessors.
   static void insertTwoBlocksAfter(VPBlockBase *IfTrue, VPBlockBase *IfFalse,
-                                   VPValue *Condition, VPBlockBase *BlockPtr) {
+                                   VPBlockBase *BlockPtr) {
     assert(IfTrue->getSuccessors().empty() &&
            "Can't insert IfTrue with successors.");
     assert(IfFalse->getSuccessors().empty() &&
            "Can't insert IfFalse with successors.");
-    BlockPtr->setTwoSuccessors(IfTrue, IfFalse, Condition);
+    BlockPtr->setTwoSuccessors(IfTrue, IfFalse);
     IfTrue->setPredecessors({BlockPtr});
     IfFalse->setPredecessors({BlockPtr});
     IfTrue->setParent(BlockPtr->getParent());
     IfFalse->setParent(BlockPtr->getParent());
   }
 
   /// Connect VPBlockBases \p From and \p To bi-directionally. Append \p To to
   /// the successors of \p From and \p From to the predecessors of \p To. Both

 
 /// Get or create a VPValue that corresponds to the expansion of \p Expr. If \p
 /// Expr is a SCEVConstant or SCEVUnknown, return a VPValue wrapping the live-in
 /// value. Otherwise return a VPExpandSCEVRecipe to expand \p Expr. If \p Plan's
 /// pre-header already contains a recipe expanding \p Expr, return it. If not,
 /// create a new one.
 VPValue *getOrCreateVPValueForSCEVExpr(VPlan &Plan, const SCEV *Expr,
                                        ScalarEvolution &SE);
-
 } // end namespace vputils
 
 } // end namespace llvm
 
 #endif // LLVM_TRANSFORMS_VECTORIZE_VPLAN_H

llvm/lib/Transforms/Vectorize/VPlan.cpp

 VPBlockBase *VPBlockBase::getEnclosingBlockWithPredecessors() {
   if (!Predecessors.empty() || !Parent)
     return this;
   assert(Parent->getEntry() == this &&
          "Block w/o predecessors not the entry of its parent.");
   return Parent->getEnclosingBlockWithPredecessors();
 }
 
-VPValue *VPBlockBase::getCondBit() {
-  return CondBitUser.getSingleOperandOrNull();
-}
-
-const VPValue *VPBlockBase::getCondBit() const {
-  return CondBitUser.getSingleOperandOrNull();
-}
-
-void VPBlockBase::setCondBit(VPValue *CV) { CondBitUser.resetSingleOpUser(CV); }
-
-VPValue *VPBlockBase::getPredicate() {
-  return PredicateUser.getSingleOperandOrNull();
-}
-
-const VPValue *VPBlockBase::getPredicate() const {
-  return PredicateUser.getSingleOperandOrNull();
-}
-
-void VPBlockBase::setPredicate(VPValue *CV) {
-  PredicateUser.resetSingleOpUser(CV);
-}
-
 void VPBlockBase::deleteCFG(VPBlockBase *Entry) {
   SmallVector<VPBlockBase *, 8> Blocks(depth_first(Entry));
 
   for (VPBlockBase *Block : Blocks)
     delete Block;
 }
 
 VPBasicBlock::iterator VPBasicBlock::getFirstNonPhi() {
LLVM_DEBUG(dbgs() << "LV: vectorizing VPBB:" << getName()
                     << " in BB:" << NewBB->getName() << '\n');
 
   State->CFG.VPBB2IRBB[this] = NewBB;
   State->CFG.PrevVPBB = this;
 
   for (VPRecipeBase &Recipe : Recipes)
     Recipe.execute(*State);
 
-  VPValue *CBV;
-  if (EnableVPlanNativePath && (CBV = getCondBit())) {
-    assert(CBV->getUnderlyingValue() &&
-           "Unexpected null underlying value for condition bit");
-
-    // Condition bit value in a VPBasicBlock is used as the branch selector. In
-    // the VPlan-native path case, since all branches are uniform we generate a
-    // branch instruction using the condition value from vector lane 0 and dummy
-    // successors. The successors are fixed later when the successor blocks are
-    // visited.
-    Value *NewCond = State->get(CBV, {0, 0});
-
-    // Replace the temporary unreachable terminator with the new conditional
-    // branch.
-    auto *CurrentTerminator = NewBB->getTerminator();
-    assert(isa<UnreachableInst>(CurrentTerminator) &&
-           "Expected to replace unreachable terminator with conditional "
-           "branch.");
-    auto *CondBr = BranchInst::Create(NewBB, nullptr, NewCond);
-    CondBr->setSuccessor(0, nullptr);
-    ReplaceInstWithInst(CurrentTerminator, CondBr);
-  }
-
   LLVM_DEBUG(dbgs() << "LV: filled BB:" << *NewBB);
 }
 
 void VPBasicBlock::dropAllReferences(VPValue *NewValue) {
   for (VPRecipeBase &R : Recipes) {
     for (auto *Def : R.definedValues())
       Def->replaceAllUsesWith(NewValue);
 
VPRegionBlock *VPBasicBlock::getEnclosingLoopRegion() {
   if (P && P->isReplicator()) {
     P = P->getParent();
     assert(!cast<VPRegionBlock>(P)->isReplicator() &&
            "unexpected nested replicate regions");
   }
   return P;
 }
 
+const VPRecipeBase *VPBasicBlock::getTerminator() const {
+  if (empty()) {
+    assert(
+        getSingleSuccessor() &&
+        "block with multiple successors doesn't have a recipe as terminator");
+    return nullptr;
+  }
+
+  const VPRecipeBase *R = &back();
+  auto *VPI = dyn_cast<VPInstruction>(R);
+  bool IsCondBranch =
+      isa<VPBranchOnMaskRecipe>(R) ||
+      (VPI && (VPI->getOpcode() == VPInstruction::BranchOnCond ||
+               VPI->getOpcode() == VPInstruction::BranchOnCount));
+
+  if (getNumSuccessors() < 2 && getParent()->getExitingBasicBlock() != this) {
+    assert(
+        !IsCondBranch &&
+        "block with 0 or 1 successors terminated by conditional branch recipe");
+    return nullptr;
+  }
+  assert(IsCondBranch && "block with multiple successors not terminated by "
+                         "conditional branch recipe");
+  return R;
+}
+
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 void VPBlockBase::printSuccessors(raw_ostream &O, const Twine &Indent) const {
   if (getSuccessors().empty()) {
     O << Indent << "No successors\n";
   } else {
     O << Indent << "Successor(s): ";
     ListSeparator LS;
     for (auto *Succ : getSuccessors())
       O << LS << Succ->getName();
     O << '\n';
   }
 }
 
 void VPBasicBlock::print(raw_ostream &O, const Twine &Indent,
                          VPSlotTracker &SlotTracker) const {
   O << Indent << getName() << ":\n";
-  if (const VPValue *Pred = getPredicate()) {
-    O << Indent << "BlockPredicate:";
-    Pred->printAsOperand(O, SlotTracker);
-    if (const auto *PredInst = dyn_cast<VPInstruction>(Pred))
-      O << " (" << PredInst->getParent()->getName() << ")";
-    O << '\n';
-  }
 
   auto RecipeIndent = Indent + "  ";
   for (const VPRecipeBase &Recipe : *this) {
     Recipe.print(O, RecipeIndent, SlotTracker);
     O << '\n';
   }
 
   printSuccessors(O, Indent);
-
-  if (const VPValue *CBV = getCondBit()) {
-    O << Indent << "CondBit: ";
-    CBV->printAsOperand(O, SlotTracker);
-    if (const auto *CBI = dyn_cast<VPInstruction>(CBV))
-      O << " (" << CBI->getParent()->getName() << ")";
-    O << '\n';
-  }
 }
 #endif
 
 void VPRegionBlock::dropAllReferences(VPValue *NewValue) {
   for (VPBlockBase *Block : depth_first(Entry))
     // Drop all references in VPBasicBlocks and replace all uses with
     // DummyValue.
     Block->dropAllReferences(NewValue);
if (Part == 0) {
       Next = Builder.CreateAdd(Phi, Step, "index.next", IsNUW, false);
     } else {
       Next = State.get(this, 0);
     }
 
     State.set(this, Next, Part);
     break;
   }
+  case VPInstruction::BranchOnCond: {
+    Value *Cond = State.get(getOperand(0), VPIteration(Part, 0));
+    VPRegionBlock *ParentRegion = getParent()->getParent();
+    VPBasicBlock *Header = ParentRegion->getEntryBasicBlock();
+
+    // Replace the temporary unreachable terminator with a new conditional
+    // branch, hooking it up to backward destination for exiting blocks now and
+    // to forward destination(s) later when they are created.
+    BranchInst *CondBr;
+    if (getParent() == ParentRegion->getExitingBasicBlock()) {
+      CondBr = Builder.CreateCondBr(Cond, Builder.GetInsertBlock(),
+                                    State.CFG.VPBB2IRBB[Header]);
+    } else {
+      CondBr = Builder.CreateCondBr(Cond, Builder.GetInsertBlock(), nullptr);
+    }
+    CondBr->setSuccessor(0, nullptr);
+    Builder.GetInsertBlock()->getTerminator()->eraseFromParent();
+    break;
+  }
   case VPInstruction::BranchOnCount: {
     if (Part != 0)
       break;
     // First create the compare.
     Value *IV = State.get(getOperand(0), Part);
     Value *TC = State.get(getOperand(1), Part);
     Value *Cond = Builder.CreateICmpEQ(IV, TC);
 
case VPInstruction::FirstOrderRecurrenceSplice:
     O << "first-order splice";
     break;
   case VPInstruction::CanonicalIVIncrement:
     O << "VF * UF + ";
     break;
   case VPInstruction::CanonicalIVIncrementNUW:
     O << "VF * UF +(nuw) ";
     break;
+  case VPInstruction::BranchOnCond:
+    O << "branch-on-cond";
+    break;
   case VPInstruction::BranchOnCount:
     O << "branch-on-count ";
     break;
   default:
     O << Instruction::getOpcodeName(getOpcode());
   }
 
   O << FMF;

llvm/lib/Transforms/Vectorize/VPlanHCFGBuilder.cpp

for (Instruction &InstRef : *BB) {
     // visited Inst when we shouldn't, breaking the RPO traversal order.
     assert(!IRDef2VPValue.count(Inst) &&
            "Instruction shouldn't have been visited.");
 
     if (auto *Br = dyn_cast<BranchInst>(Inst)) {
       // Branch instruction is not explicitly represented in VPlan but we need
       // to represent its condition bit when it's conditional.
       if (Br->isConditional())
         getOrCreateVPOperand(Br->getCondition());
 
       // Skip the rest of the Instruction processing for Branch instructions.
       continue;
     }
 
     VPValue *NewVPV;
     if (auto *Phi = dyn_cast<PHINode>(Inst)) {
       // Phi node's operands may have not been visited at this point. We create
if (NumSuccs == 1) {
       auto *Br = cast<BranchInst>(TI);
       Value *BrCond = Br->getCondition();
       // Look up the branch condition to get the corresponding VPValue
       // representing the condition bit in VPlan (which may be in another VPBB).
       assert(IRDef2VPValue.count(BrCond) &&
              "Missing condition bit in IRDef2VPValue!");
       VPValue *VPCondBit = IRDef2VPValue[BrCond];
 
       // Link successors using condition bit.
-      VPBB->setTwoSuccessors(SuccVPBB0, SuccVPBB1, VPCondBit);
+      VPBB->setTwoSuccessors(SuccVPBB0, SuccVPBB1);
+      VPBB->appendRecipe(
+          new VPInstruction(VPInstruction::BranchOnCond, {VPCondBit}));
     } else
       llvm_unreachable("Number of successors not supported.");
 
     // Set VPBB predecessors in the same order as they are in the incoming BB.
     setVPBBPredsFromBB(VPBB, BB);
   }
 
   // 2. Process outermost loop exit. We created an empty VPBB for the loop

llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp

void VPlanTransforms::VPInstructionsToVPRecipes(
     SmallPtrSetImpl<Instruction *> &DeadInstructions, ScalarEvolution &SE) {
 
   ReversePostOrderTraversal<VPBlockRecursiveTraversalWrapper<VPBlockBase *>>
       RPOT(Plan->getEntry());
   for (VPBasicBlock *VPBB : VPBlockUtils::blocksOnly<VPBasicBlock>(RPOT)) {
     // Introduce each ingredient into VPlan.
     for (VPRecipeBase &Ingredient : llvm::make_early_inc_range(*VPBB)) {
       VPValue *VPV = Ingredient.getVPSingleValue();
+      if (!VPV->getUnderlyingValue())
+        continue;
       Instruction *Inst = cast<Instruction>(VPV->getUnderlyingValue());
       if (DeadInstructions.count(Inst)) {
         VPValue DummyValue;
         VPV->replaceAllUsesWith(&DummyValue);
         Ingredient.eraseFromParent();
         continue;
       }
 

llvm/lib/Transforms/Vectorize/VPlanValue.h

 /// This class augments VPValue with operands which provide the inverse def-use
 /// edges from VPValue's users to their defs.
 class VPUser {
 public:
   /// Subclass identifier (for isa/dyn_cast).
   enum class VPUserID {
     Recipe,
     LiveOut,
-    // TODO: Currently VPUsers are used in VPBlockBase, but in the future the
-    // only VPUsers should either be recipes or live-outs.
-    Block
   };
 
 private:
   SmallVector<VPValue *, 2> Operands;
 
   VPUserID ID;
 
 protected:

llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp

 /// not specific for VPBasicBlocks or VPRegionBlocks.
 static void verifyBlocksInRegion(const VPRegionBlock *Region) {
   for (const VPBlockBase *VPB : make_range(
            df_iterator<const VPBlockBase *>::begin(Region->getEntry()),
            df_iterator<const VPBlockBase *>::end(Region->getExiting()))) {
     // Check block's parent.
     assert(VPB->getParent() == Region && "VPBlockBase has wrong parent");
 
+    auto *VPBB = dyn_cast<VPBasicBlock>(VPB);
     // Check block's condition bit.
     if (VPB->getNumSuccessors() > 1 || Region->getExitingBasicBlock() == VPB)
-      assert(VPB->getCondBit() && "Missing condition bit!");
+      assert(VPBB && VPBB->getTerminator() &&
+             "Block has multiple successors but doesn't "
+             "have a proper branch recipe!");
     else
-      assert(!VPB->getCondBit() && "Unexpected condition bit!");
+      assert((!VPBB || !VPBB->getTerminator()) && "Unexpected branch recipe!");
 
     // Check block's successors.
     const auto &Successors = VPB->getSuccessors();
     // There must be only one instance of a successor in block's successor list.
     // TODO: This won't work for switch statements.
     assert(!hasDuplicates(Successors) &&
            "Multiple instances of the same successor.");
 
     for (const VPBlockBase *Succ : Successors) {

llvm/test/Transforms/LoopVectorize/first-order-recurrence-sink-replicate-region.ll

 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.0:
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep> = getelementptr ir<%ptr>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv> = load ir<%gep> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED1:%.+]]> = ir<%lv>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 ; CHECK-NEXT: Successor(s): loop.1
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.1:
 ; CHECK-NEXT:   WIDEN ir<%conv> = sext vp<[[PRED1]]>
 ; CHECK-NEXT:   EMIT vp<[[SPLICE:%.+]]> = first-order splice ir<%0> ir<%conv>
 ; CHECK-NEXT: Successor(s): pred.srem
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.srem: {
 ; CHECK-NEXT:   pred.srem.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.srem.if, pred.srem.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.srem.if:
 ; CHECK-NEXT:     REPLICATE ir<%rem> = srem vp<[[SPLICE]]>, ir<%x> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.srem.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.srem.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED2:%.+]]> = ir<%rem>
 ; CHECK-NEXT:   No successors

 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.0.split:
 ; CHECK-NEXT:   Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:  pred.store.entry:
 ; CHECK-NEXT:    BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:  Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:  CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:  pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%rem> = srem vp<[[SPLICE]]>, ir<%x>
 ; CHECK-NEXT:     REPLICATE ir<%add> = add ir<%rem>, ir<%recur.next>
 ; CHECK-NEXT:     REPLICATE ir<%gep> = getelementptr ir<%ptr>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE store ir<%add>, ir<%gep>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:

 ; CHECK-NEXT:   WIDEN ir<%recur.next> = sext ir<%y>
 ; CHECK-NEXT:   EMIT vp<[[SPLICE:%.+]]> = first-order splice ir<%recur> ir<%recur.next>
 ; CHECK-NEXT: Successor(s): pred.srem
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.srem: {
 ; CHECK-NEXT:   pred.srem.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.srem.if, pred.srem.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.srem.if:
 ; CHECK-NEXT:     REPLICATE ir<%rem> = srem vp<[[SPLICE]]>, ir<%x> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.srem.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.srem.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%rem>
 ; CHECK-NEXT:   No successors

 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.0:
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%lv> = load ir<%gep> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 ; CHECK-NEXT: Successor(s): loop.1
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.1:
 ; CHECK-NEXT:   WIDEN ir<%conv> = sext vp<[[PRED]]>
 ; CHECK-NEXT:   EMIT vp<[[SPLICE:%.+]]> = first-order splice ir<%0> ir<%conv>
 ; CHECK-NEXT: Successor(s): loop.1.split
 
 ; CHECK:      loop.1.split:
 ; CHECK-NEXT: Successor(s): pred.load
 
 ; CHECK:      <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 
 ; CHECK:        pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%rem> = srem vp<[[SPLICE]]>, ir<%x> (S->V)
 ; CHECK-NEXT:     REPLICATE ir<%lv.2> = load ir<%gep> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 
 ; CHECK:        pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED1:%.+]]> = ir<%rem>

 ; CHECK-NEXT:   WIDEN ir<%recur.next> = sext ir<%y>
 ; CHECK-NEXT:   EMIT vp<[[SPLICE:%.+]]> = first-order splice ir<%recur> ir<%recur.next>
 ; CHECK-NEXT: Successor(s): pred.srem
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.srem: {
 ; CHECK-NEXT:   pred.srem.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.srem.if, pred.srem.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.srem.if:
 ; CHECK-NEXT:     REPLICATE ir<%rem> = srem vp<[[SPLICE]]>, ir<%x>
 ; CHECK-NEXT:   Successor(s): pred.srem.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.srem.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%rem>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 ; CHECK-NEXT: Successor(s): loop.1.split
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.1.split:
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%rem.div> = sdiv ir<20>, vp<[[PRED]]>
 ; CHECK-NEXT:     REPLICATE ir<%gep> = getelementptr ir<%ptr>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE store ir<%rem.div>, ir<%gep>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:

llvm/test/Transforms/LoopVectorize/icmp-uniforms.ll

 ; CHECK-NEXT:   WIDEN ir<%cond0> = icmp ir<%iv>, ir<13>
 ; CHECK-NEXT:   WIDEN-SELECT ir<%s> = select ir<%cond0>, ir<10>, ir<20>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT:  <xVFxUF> pred.store: {
 ; CHECK-NEXT:    pred.store.entry:
 ; CHECK-NEXT:      BRANCH-ON-MASK vp<[[COND]]>
 ; CHECK-NEXT:    Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:    CondBit: vp<[[COND]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:    pred.store.if:
 ; CHECK-NEXT:      REPLICATE ir<%gep> = getelementptr ir<%ptr>, vp<[[STEPS]]>
 ; CHECK-NEXT:      REPLICATE store ir<%s>, ir<%gep>
 ; CHECK-NEXT:    Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:    pred.store.continue:
 ; CHECK-NEXT:    No successors

llvm/test/Transforms/LoopVectorize/vplan-printing-outer-loop.ll

 ; CHECK-EMPTY:
 ; CHECK-NEXT:   <x1> inner: {
 ; CHECK-NEXT:     inner:
 ; CHECK-NEXT:       WIDEN-PHI ir<%inner.iv> = phi ir<0>, ir<%inner.iv.next>
 ; CHECK-NEXT:       EMIT ir<%gep.2> = getelementptr ir<@arr> ir<0> ir<%inner.iv> ir<%outer.iv>
 ; CHECK-NEXT:       EMIT store ir<%add> ir<%gep.2>
 ; CHECK-NEXT:       EMIT ir<%inner.iv.next> = add ir<%inner.iv> ir<1>
 ; CHECK-NEXT:       EMIT ir<%inner.ec> = icmp ir<%inner.iv.next> ir<8>
+; CHECK-NEXT:       EMIT branch-on-cond ir<%inner.ec>
 ; CHECK-NEXT:   No successors
-; CHECK-NEXT:   CondBit: ir<%inner.ec> (inner)
 ; CHECK-NEXT:  }
 ; CHECK-NEXT:  Successor(s): outer.latch
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   outer.latch:
 ; CHECK-NEXT:     EMIT ir<%outer.iv.next> = add ir<%outer.iv> ir<1>
 ; CHECK-NEXT:     EMIT ir<%outer.ec> = icmp ir<%outer.iv.next> ir<8>
+; CHECK-NEXT:     EMIT branch-on-cond ir<%outer.ec>
 ; CHECK-NEXT:   No successors
-; CHECK-NEXT:   CondBit: ir<%outer.ec> (outer.latch)
 ; CHECK-NEXT:  }
 ; CHECK-NEXT: Successor(s): exit
 ; CHECK-EMPTY:
 ; CHECK-NEXT: exit:
 ; CHECK-NEXT: No successors
 ; CHECK-NEXT: }
 entry:
   br label %outer.header

llvm/test/Transforms/LoopVectorize/vplan-printing.ll

 ; CHECK-EMPTY:
 ; CHECK-NEXT: if.then:
 ; CHECK-NEXT: Successor(s): pred.udiv
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.udiv: {
 ; CHECK-NEXT:   pred.udiv.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK ir<%cmp>
 ; CHECK-NEXT:   Successor(s): pred.udiv.if, pred.udiv.continue
-; CHECK-NEXT:   CondBit: ir<%cmp>
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.udiv.if:
 ; CHECK-NEXT:     REPLICATE ir<%tmp4> = udiv ir<%n>, vp<[[STEPS]]> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.udiv.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.udiv.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%tmp4>
 ; CHECK-NEXT:   No successors

 ; CHECK-NEXT:    EMIT vp<[[SEL1:%.+]]> = select vp<[[NOT1]]> ir<%cmp2> ir<false>, !dbg /tmp/s.c:5:21
 ; CHECK-NEXT:    EMIT vp<[[OR1:%.+]]> = or vp<[[SEL1]]> ir<%cmp1>
 ; CHECK-NEXT:  Successor(s): pred.sdiv
 ; CHECK-EMPTY:
 ; CHECK-NEXT:  <xVFxUF> pred.sdiv: {
 ; CHECK-NEXT:    pred.sdiv.entry:
 ; CHECK-NEXT:      BRANCH-ON-MASK vp<[[OR1]]>
 ; CHECK-NEXT:    Successor(s): pred.sdiv.if, pred.sdiv.continue
-; CHECK-NEXT:    CondBit: vp<[[OR1]]> (if.then)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:    pred.sdiv.if:
 ; CHECK-NEXT:      REPLICATE ir<%sd1> = sdiv ir<%psd>, ir<%lsd> (S->V)
 ; CHECK-NEXT:    Successor(s): pred.sdiv.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:    pred.sdiv.continue:
 ; CHECK-NEXT:      PHI-PREDICATED-INSTRUCTION vp<[[PHI:%.+]]> = ir<%sd1>
 ; CHECK-NEXT:    No successors

llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge-vf1.ll

 
 ; CHECK:      if.then:
 ; CHECK-NEXT: Successor(s): pred.store
 
 ; CHECK:      <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK ir<%c>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: ir<%c>
 
 ; CHECK:      pred.store.if:
 ; CHECK-NEXT:   CLONE store ir<%tmp5>, ir<%tmp2>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 
 ; CHECK:      pred.store.continue:
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }

llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll

 
 ; CHECK:      loop.0:
 ; CHECK-NEXT: Successor(s): pred.store
 
 ; CHECK:      <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 
 ; CHECK:      pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b>
 ; CHECK-NEXT:     REPLICATE ir<%add> = add ir<%lv.b>, ir<10>
 ; CHECK-NEXT:     REPLICATE ir<%mul> = mul ir<2>, ir<%add>
 ; CHECK-NEXT:     REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, vp<[[STEPS]]
 ; CHECK-NEXT:     REPLICATE store ir<%mul>, ir<%gep.a>

 ; CHECK-NEXT:   vp<[[STEPS:%.+]]> = SCALAR-STEPS vp<[[CAN_IV]]>, ir<0>, ir<1>
 ; CHECK-NEXT:   EMIT vp<[[MASK:%.+]]> = icmp ule ir<%iv> vp<[[BTC]]>
 ; CHECK-NEXT: Successor(s): pred.load
 
 ; CHECK:      <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 
 ; CHECK:      pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b>
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 
 ; CHECK:      pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv.b>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 
 ; CHECK:      loop.0:
 ; CHECK-NEXT:   WIDEN ir<%mul> = mul ir<%iv>, ir<2>
 ; CHECK-NEXT: Successor(s): pred.store
 
 ; CHECK:      <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 
 ; CHECK:       pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%add> = add vp<[[PRED]]>, ir<10>
 ; CHECK-NEXT:     REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, ir<%mul>
 ; CHECK-NEXT:     REPLICATE store ir<%add>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 
 ; CHECK:      pred.store.continue:

 ; CHECK-NEXT:   vp<[[STEPS:%.+]]> = SCALAR-STEPS vp<[[CAN_IV]]>, ir<0>, ir<1>
 ; CHECK-NEXT:   EMIT vp<[[MASK:%.+]]> = icmp ule ir<%iv> vp<[[BTC]]>
 ; CHECK-NEXT: Successor(s): pred.load
 
 ; CHECK:      <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 
 ; CHECK:       pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 
 ; CHECK:       pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv.b>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 
 ; CHECK:      loop.0:
 ; CHECK-NEXT:   WIDEN ir<%add> = add vp<[[PRED]]>, ir<10>
 ; CHECK-NEXT:   WIDEN ir<%mul> = mul ir<%iv>, ir<%add>
 ; CHECK-NEXT: Successor(s): pred.store
 
 ; CHECK:      <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 
 ; CHECK:      pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, ir<%mul>
 ; CHECK-NEXT:     REPLICATE store ir<%add>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 
 ; CHECK:      pred.store.continue:
 ; CHECK-NEXT:   No successors

 ; CHECK-NEXT:   EMIT vp<[[MASK:%.+]]> = icmp ule vp<[[WIDE_CAN_IV]]> vp<[[BTC]]>
 ; CHECK-NEXT:   CLONE ir<%gep.A.uniform> = getelementptr ir<%A>, ir<0>
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%lv> = load ir<%gep.A.uniform>
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 ; CHECK-NEXT: Successor(s): loop.0
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.0:
 ; CHECK-NEXT:   WIDEN ir<%cmp> = icmp ir<%iv>, ir<%k>
 ; CHECK-NEXT: Successor(s): loop.then
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.then:
 ; CHECK-NEXT:   EMIT vp<[[NOT2:%.+]]> = not ir<%cmp>
 ; CHECK-NEXT:   EMIT vp<[[MASK2:%.+]]> = select vp<[[MASK]]> vp<[[NOT2]]> ir<false>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK2]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK2]]> (loop.then)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.B> = getelementptr ir<%B>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE store vp<[[PRED]]>, ir<%gep.B>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:   No successors

 ; CHECK-NEXT: then.0:
 ; CHECK-NEXT:   EMIT vp<[[MASK2:%.+]]> = select vp<[[MASK1]]> ir<%c.1> ir<false>
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK2]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK2]]> (then.0)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv.b>

 ; CHECK-NEXT:   BLEND %p = ir<0>/vp<[[MASK3]]> vp<[[PRED]]>/vp<[[MASK2]]>
 ; CHECK-NEXT:   EMIT vp<[[OR:%.+]]> = or vp<[[MASK2]]> vp<[[MASK3]]>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[OR]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[OR]]> (next.0)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, ir<%mul>
 ; CHECK-NEXT:     REPLICATE store ir<%p>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:   No successors

 ; CHECK-NEXT: then.0:
 ; CHECK-NEXT:   EMIT vp<[[MASK2:%.+]]> = select vp<[[MASK1]]> ir<%c.0> ir<false>
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK2]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK2]]> (then.0)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b> (S->V)
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv.b>

 ; CHECK-NEXT:   EMIT vp<[[OR:%.+]]> = or vp<[[MASK2]]> vp<[[MASK3]]>
 ; CHECK-NEXT:   EMIT vp<[[MASK4:%.+]]> = select vp<[[OR]]> ir<%c.1> ir<false>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK4]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK4]]> (then.1)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, ir<%mul>
 ; CHECK-NEXT:     REPLICATE store ir<%p>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:   No successors

 ; CHECK-NEXT: then.0:
 ; CHECK-NEXT:   EMIT vp<[[MASK2:%.+]]> = select vp<[[MASK1:%.+]]> ir<%c.0> ir<false>
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK2]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK2]]> (then.0)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b>
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv.b>

 ; CHECK-NEXT:   EMIT vp<[[MASK4:%.+]]> = or vp<[[MASK2]]> vp<[[MASK3]]>
 ; CHECK-NEXT:   EMIT vp<[[MASK5:%.+]]> = select vp<[[MASK4]]> ir<%c.0> ir<false>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK5]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK5]]> (then.1)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, ir<%mul>
 ; CHECK-NEXT:     REPLICATE store ir<0>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:   No successors

 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.2:
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%lv.a> = load ir<%gep.a>
 ; CHECK-NEXT:     REPLICATE ir<%gep.b> = getelementptr ir<@b>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE ir<%lv.b> = load ir<%gep.b>
 ; CHECK-NEXT:     REPLICATE ir<%gep.c> = getelementptr ir<@c>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE store ir<%lv.a>, ir<%gep.c>
 ; CHECK-NEXT:     REPLICATE store ir<%lv.b>, ir<%gep.a>

 ; CHECK-NEXT:   WIDEN ir<%mul> = mul vp<[[PRED1]]>, vp<[[PRED2]]>
 ; CHECK-NEXT:   EMIT vp<[[MASK2:%.+]]> = select vp<[[MASK]]> ir<%c.0> ir<false>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK2]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK2]]> (then.0)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep.c.1> = getelementptr ir<@c>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE store ir<%mul>, ir<%gep.c.1>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:   No successors

 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.1:
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%lv.a> = load ir<%gep.a>
 ; CHECK-NEXT:     REPLICATE ir<%div> = sdiv ir<%lv.a>, ir<%lv.a>
 ; CHECK-NEXT:     REPLICATE store ir<%div>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:

 ; CHECK-NEXT:   EMIT vp<[[MASK:%.+]]> = icmp ule ir<%iv> vp<[[BTC]]>
 ; CHECK-NEXT:   REPLICATE ir<%gep.a> = getelementptr ir<@a>, ir<0>, vp<[[STEPS]]>
 ; CHECK-NEXT: Successor(s): pred.load
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.load: {
 ; CHECK-NEXT:   pred.load.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.load.if, pred.load.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.if:
 ; CHECK-NEXT:     REPLICATE ir<%lv.a> = load ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.load.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.load.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED:%.+]]> = ir<%lv.a>
 ; CHECK-NEXT:   No successors
 ; CHECK-NEXT: }
 ; CHECK-NEXT: Successor(s): loop.0
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.0:
 ; CHECK-NEXT:   EMIT vp<[[SPLICE:%.+]]> = first-order splice ir<%for> ir<%lv.a>
 ; CHECK-NEXT: Successor(s): loop.1
 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.1:
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (vector.body)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%div> = sdiv vp<[[SPLICE]]>, vp<[[PRED]]>
 ; CHECK-NEXT:     REPLICATE store ir<%div>, ir<%gep.a>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:     PHI-PREDICATED-INSTRUCTION vp<[[PRED2:%.+]]> = ir<%div>

 ; CHECK-EMPTY:
 ; CHECK-NEXT: loop.then.0:
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK ir<%c>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: ir<%c>
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%l1> = load ir<%src>
 ; CHECK-NEXT:     REPLICATE ir<%cmp> = icmp ir<%l1>, ir<0>
 ; CHECK-NEXT:     REPLICATE ir<%l2> = trunc ir<%l1>
 ; CHECK-NEXT:     REPLICATE ir<%sel> = select ir<%cmp>, ir<5>, ir<%l2>
 ; CHECK-NEXT:     REPLICATE store ir<%sel>, ir<%dst>
 ; CHECK-NEXT:   Successor(s): pred.store.continue

 ; CHECK-NEXT: then:
 ; CHECK-NEXT:   EMIT vp<[[MASK:%.+]]> = not ir<%pred>
 ; CHECK-NEXT: Successor(s): pred.store
 ; CHECK-EMPTY:
 ; CHECK-NEXT: <xVFxUF> pred.store: {
 ; CHECK-NEXT:   pred.store.entry:
 ; CHECK-NEXT:     BRANCH-ON-MASK vp<[[MASK]]>
 ; CHECK-NEXT:   Successor(s): pred.store.if, pred.store.continue
-; CHECK-NEXT:   CondBit: vp<[[MASK]]> (then)
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.if:
 ; CHECK-NEXT:     REPLICATE ir<%gep> = getelementptr ir<%addr>, vp<[[STEPS]]>
 ; CHECK-NEXT:     REPLICATE store ir<1.000000e+01>, ir<%gep>
 ; CHECK-NEXT:   Successor(s): pred.store.continue
 ; CHECK-EMPTY:
 ; CHECK-NEXT:   pred.store.continue:
 ; CHECK-NEXT:   No successors

llvm/unittests/Transforms/Vectorize/VPlanHCFGTest.cpp

TEST_F(VPlanHCFGTest, testBuildHCFGInnerLoop) {
   Function *F = M.getFunction("f");
   BasicBlock *LoopHeader = F->getEntryBlock().getSingleSuccessor();
   auto Plan = buildHCFG(LoopHeader);
 
   VPBasicBlock *Entry = Plan->getEntry()->getEntryBasicBlock();
   EXPECT_NE(nullptr, Entry->getSingleSuccessor());
   EXPECT_EQ(0u, Entry->getNumPredecessors());
   EXPECT_EQ(1u, Entry->getNumSuccessors());
-  EXPECT_EQ(nullptr, Entry->getCondBit());
 
   // Check that the region following the preheader is a single basic-block
   // region (loop).
   VPBasicBlock *VecBB = Entry->getSingleSuccessor()->getEntryBasicBlock();
   EXPECT_EQ(7u, VecBB->size());
   EXPECT_EQ(0u, VecBB->getNumPredecessors());
   EXPECT_EQ(0u, VecBB->getNumSuccessors());
   EXPECT_EQ(VecBB->getParent()->getEntryBasicBlock(), VecBB);
TEST_F(VPlanHCFGTest, testBuildHCFGInnerLoop) {
   EXPECT_EQ(Instruction::Add, IndvarAdd->getOpcode());
   EXPECT_EQ(2u, IndvarAdd->getNumOperands());
   EXPECT_EQ(Phi, IndvarAdd->getOperand(0));
 
   VPInstruction *ICmp = dyn_cast<VPInstruction>(&*Iter++);
   EXPECT_EQ(Instruction::ICmp, ICmp->getOpcode());
   EXPECT_EQ(2u, ICmp->getNumOperands());
   EXPECT_EQ(IndvarAdd, ICmp->getOperand(0));
-  EXPECT_EQ(VecBB->getCondBit(), ICmp);
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   // Add an external value to check we do not print the list of external values,
   // as this is not required with the new printing.
   Plan->addVPValue(&*F->arg_begin());
   std::string FullDump;
   raw_string_ostream OS(FullDump);
   Plan->printDOT(OS);
N1 [label =
       "  WIDEN-PHI ir\<%indvars.iv\> = phi ir\<0\>, ir\<%indvars.iv.next\>\l" +
       "  EMIT ir\<%arr.idx\> = getelementptr ir\<%A\> ir\<%indvars.iv\>\l" +
       "  EMIT ir\<%l1\> = load ir\<%arr.idx\>\l" +
       "  EMIT ir\<%res\> = add ir\<%l1\> ir\<10\>\l" +
       "  EMIT store ir\<%res\> ir\<%arr.idx\>\l" +
       "  EMIT ir\<%indvars.iv.next\> = add ir\<%indvars.iv\> ir\<1\>\l" +
       "  EMIT ir\<%exitcond\> = icmp ir\<%indvars.iv.next\> ir\<%N\>\l" +
       "No successors\l" +
-      "CondBit: ir\<%exitcond\> (vector.body)\l"
     ]
   }
   N1 -> N3 [ label="" ltail=cluster_N2]
   N3 [label =
     "for.end:\l" +
     "No successors\l"
   ]
 }