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📄 AMDGPU.h(11.46 KB)
📄 AMDGPU.td(36.97 KB)
📄 AMDGPUAliasAnalysis.cpp(5.58 KB)
📄 AMDGPUAliasAnalysis.h(3.32 KB)
📄 AMDGPUAlwaysInlinePass.cpp(4.83 KB)
📄 AMDGPUAnnotateKernelFeatures.cpp(11.94 KB)
📄 AMDGPUAnnotateUniformValues.cpp(6.13 KB)
📄 AMDGPUArgumentUsageInfo.cpp(7.66 KB)
📄 AMDGPUArgumentUsageInfo.h(4.81 KB)
📄 AMDGPUAsmPrinter.cpp(50.42 KB)
📄 AMDGPUAsmPrinter.h(5.13 KB)
📄 AMDGPUAtomicOptimizer.cpp(23.79 KB)
📄 AMDGPUCallLowering.cpp(28.66 KB)
📄 AMDGPUCallLowering.h(2.37 KB)
📄 AMDGPUCallingConv.td(7.33 KB)
📄 AMDGPUCodeGenPrepare.cpp(46.42 KB)
📄 AMDGPUCombine.td(2.79 KB)
📄 AMDGPUExportClustering.cpp(4.52 KB)
📄 AMDGPUExportClustering.h(533 B)
📄 AMDGPUFeatures.td(1.81 KB)
📄 AMDGPUFixFunctionBitcasts.cpp(1.87 KB)
📄 AMDGPUFrameLowering.cpp(1.98 KB)
📄 AMDGPUFrameLowering.h(1.39 KB)
📄 AMDGPUGISel.td(11.57 KB)
📄 AMDGPUGenRegisterBankInfo.def(5.83 KB)
📄 AMDGPUGlobalISelUtils.cpp(1.77 KB)
📄 AMDGPUGlobalISelUtils.h(2.07 KB)
📄 AMDGPUHSAMetadataStreamer.cpp(31.21 KB)
📄 AMDGPUHSAMetadataStreamer.h(5.46 KB)
📄 AMDGPUISelDAGToDAG.cpp(101.59 KB)
📄 AMDGPUISelLowering.cpp(168.65 KB)
📄 AMDGPUISelLowering.h(19.23 KB)
📄 AMDGPUInline.cpp(7.97 KB)
📄 AMDGPUInstrInfo.cpp(1.71 KB)
📄 AMDGPUInstrInfo.h(1.66 KB)
📄 AMDGPUInstrInfo.td(17.18 KB)
📄 AMDGPUInstructionSelector.cpp(128.53 KB)
📄 AMDGPUInstructionSelector.h(11.04 KB)
📄 AMDGPUInstructions.td(25.36 KB)
📄 AMDGPULegalizerInfo.cpp(149.32 KB)
📄 AMDGPULegalizerInfo.h(8.49 KB)
📄 AMDGPULibCalls.cpp(53.89 KB)
📄 AMDGPULibFunc.cpp(37.85 KB)
📄 AMDGPULibFunc.h(10.99 KB)
📄 AMDGPULowerIntrinsics.cpp(4.55 KB)
📄 AMDGPULowerKernelArguments.cpp(8.89 KB)
📄 AMDGPULowerKernelAttributes.cpp(7.78 KB)
📄 AMDGPUMCInstLower.cpp(14.27 KB)
📄 AMDGPUMachineCFGStructurizer.cpp(101.97 KB)
📄 AMDGPUMachineFunction.cpp(2.24 KB)
📄 AMDGPUMachineFunction.h(2.13 KB)
📄 AMDGPUMachineModuleInfo.cpp(1.34 KB)
📄 AMDGPUMachineModuleInfo.h(5.46 KB)
📄 AMDGPUMacroFusion.cpp(2.28 KB)
📄 AMDGPUMacroFusion.h(679 B)
📄 AMDGPUOpenCLEnqueuedBlockLowering.cpp(5.31 KB)
📄 AMDGPUPTNote.h(1.29 KB)
📄 AMDGPUPerfHintAnalysis.cpp(12.17 KB)
📄 AMDGPUPerfHintAnalysis.h(1.67 KB)
📄 AMDGPUPostLegalizerCombiner.cpp(12.02 KB)
📄 AMDGPUPreLegalizerCombiner.cpp(5.45 KB)
📄 AMDGPUPrintfRuntimeBinding.cpp(21.7 KB)
📄 AMDGPUPromoteAlloca.cpp(35.24 KB)
📄 AMDGPUPropagateAttributes.cpp(11.76 KB)
📄 AMDGPURegBankCombiner.cpp(5.36 KB)
📄 AMDGPURegisterBankInfo.cpp(161.67 KB)
📄 AMDGPURegisterBankInfo.h(7.41 KB)
📄 AMDGPURegisterBanks.td(921 B)
📄 AMDGPURewriteOutArguments.cpp(15.82 KB)
📄 AMDGPUSearchableTables.td(21.04 KB)
📄 AMDGPUSubtarget.cpp(29.62 KB)
📄 AMDGPUSubtarget.h(35.82 KB)
📄 AMDGPUTargetMachine.cpp(42.67 KB)
📄 AMDGPUTargetMachine.h(4.52 KB)
📄 AMDGPUTargetObjectFile.cpp(1.54 KB)
📄 AMDGPUTargetObjectFile.h(1.14 KB)
📄 AMDGPUTargetTransformInfo.cpp(39.07 KB)
📄 AMDGPUTargetTransformInfo.h(11.11 KB)
📄 AMDGPUUnifyDivergentExitNodes.cpp(13.84 KB)
📄 AMDGPUUnifyMetadata.cpp(4.46 KB)
📄 AMDILCFGStructurizer.cpp(56.32 KB)
📄 AMDKernelCodeT.h(32.84 KB)
📁 AsmParser
📄 BUFInstructions.td(110.75 KB)
📄 CaymanInstructions.td(7.93 KB)
📄 DSInstructions.td(52.37 KB)
📁 Disassembler
📄 EvergreenInstructions.td(28.24 KB)
📄 FLATInstructions.td(66.93 KB)
📄 GCNDPPCombine.cpp(19.92 KB)
📄 GCNHazardRecognizer.cpp(45.3 KB)
📄 GCNHazardRecognizer.h(3.96 KB)
📄 GCNILPSched.cpp(11.3 KB)
📄 GCNIterativeScheduler.cpp(20.62 KB)
📄 GCNIterativeScheduler.h(4.16 KB)
📄 GCNMinRegStrategy.cpp(8.47 KB)
📄 GCNNSAReassign.cpp(10.92 KB)
📄 GCNProcessors.td(4.84 KB)
📄 GCNRegBankReassign.cpp(26.68 KB)
📄 GCNRegPressure.cpp(16.27 KB)
📄 GCNRegPressure.h(9.15 KB)
📄 GCNSchedStrategy.cpp(21.67 KB)
📄 GCNSchedStrategy.h(3.77 KB)
📁 MCTargetDesc
📄 MIMGInstructions.td(39.85 KB)
📄 R600.td(1.51 KB)
📄 R600AsmPrinter.cpp(4.46 KB)
📄 R600AsmPrinter.h(1.5 KB)
📄 R600ClauseMergePass.cpp(7.38 KB)
📄 R600ControlFlowFinalizer.cpp(23.4 KB)
📄 R600Defines.h(4.25 KB)
📄 R600EmitClauseMarkers.cpp(12.1 KB)
📄 R600ExpandSpecialInstrs.cpp(10.11 KB)
📄 R600FrameLowering.cpp(1.83 KB)
📄 R600FrameLowering.h(1.25 KB)
📄 R600ISelLowering.cpp(81.88 KB)
📄 R600ISelLowering.h(4.8 KB)
📄 R600InstrFormats.td(11.58 KB)
📄 R600InstrInfo.cpp(49.47 KB)
📄 R600InstrInfo.h(13.7 KB)
📄 R600Instructions.td(55.13 KB)
📄 R600MachineFunctionInfo.cpp(551 B)
📄 R600MachineFunctionInfo.h(824 B)
📄 R600MachineScheduler.cpp(13.57 KB)
📄 R600MachineScheduler.h(2.53 KB)
📄 R600OpenCLImageTypeLoweringPass.cpp(11.75 KB)
📄 R600OptimizeVectorRegisters.cpp(13.4 KB)
📄 R600Packetizer.cpp(13.4 KB)
📄 R600Processors.td(4.42 KB)
📄 R600RegisterInfo.cpp(3.95 KB)
📄 R600RegisterInfo.h(2 KB)
📄 R600RegisterInfo.td(9.75 KB)
📄 R600Schedule.td(1.62 KB)
📄 R700Instructions.td(783 B)
📄 SIAddIMGInit.cpp(6.24 KB)
📄 SIAnnotateControlFlow.cpp(11.18 KB)
📄 SIDefines.h(20.86 KB)
📄 SIFixSGPRCopies.cpp(29.46 KB)
📄 SIFixVGPRCopies.cpp(2 KB)
📄 SIFixupVectorISel.cpp(8.75 KB)
📄 SIFoldOperands.cpp(54.56 KB)
📄 SIFormMemoryClauses.cpp(12.76 KB)
📄 SIFrameLowering.cpp(48.08 KB)
📄 SIFrameLowering.h(2.98 KB)
📄 SIISelLowering.cpp(423.43 KB)
📄 SIISelLowering.h(22.13 KB)
📄 SIInsertHardClauses.cpp(7.01 KB)
📄 SIInsertSkips.cpp(15.29 KB)
📄 SIInsertWaitcnts.cpp(58.33 KB)
📄 SIInstrFormats.td(9.44 KB)
📄 SIInstrInfo.cpp(247.15 KB)
📄 SIInstrInfo.h(41.24 KB)
📄 SIInstrInfo.td(90.7 KB)
📄 SIInstructions.td(77.7 KB)
📄 SILoadStoreOptimizer.cpp(76.21 KB)
📄 SILowerControlFlow.cpp(22.66 KB)
📄 SILowerI1Copies.cpp(27.83 KB)
📄 SILowerSGPRSpills.cpp(12.68 KB)
📄 SIMachineFunctionInfo.cpp(20.01 KB)
📄 SIMachineFunctionInfo.h(26.91 KB)
📄 SIMachineScheduler.cpp(69.44 KB)
📄 SIMachineScheduler.h(15.65 KB)
📄 SIMemoryLegalizer.cpp(45.84 KB)
📄 SIModeRegister.cpp(17.43 KB)
📄 SIOptimizeExecMasking.cpp(12.81 KB)
📄 SIOptimizeExecMaskingPreRA.cpp(11.13 KB)
📄 SIPeepholeSDWA.cpp(42.84 KB)
📄 SIPostRABundler.cpp(3.6 KB)
📄 SIPreAllocateWWMRegs.cpp(6.09 KB)
📄 SIPreEmitPeephole.cpp(10.51 KB)
📄 SIProgramInfo.h(2.04 KB)
📄 SIRegisterInfo.cpp(71.51 KB)
📄 SIRegisterInfo.h(13.04 KB)
📄 SIRegisterInfo.td(37.28 KB)
📄 SIRemoveShortExecBranches.cpp(4.96 KB)
📄 SISchedule.td(7.58 KB)
📄 SIShrinkInstructions.cpp(26.86 KB)
📄 SIWholeQuadMode.cpp(30.22 KB)
📄 SMInstructions.td(48.14 KB)
📄 SOPInstructions.td(60.51 KB)
📁 TargetInfo
📁 Utils
📄 VIInstrFormats.td(645 B)
📄 VOP1Instructions.td(35.53 KB)
📄 VOP2Instructions.td(65.04 KB)
📄 VOP3Instructions.td(53.14 KB)
📄 VOP3PInstructions.td(26.47 KB)
📄 VOPCInstructions.td(63.31 KB)
📄 VOPInstructions.td(23.76 KB)

Editing: SIAnnotateControlFlow.cpp

//===- SIAnnotateControlFlow.cpp ------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Annotates the control flow with hardware specific intrinsics.
//
//===----------------------------------------------------------------------===//

#include "AMDGPU.h"
#include "AMDGPUSubtarget.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/LegacyDivergenceAnalysis.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include <cassert>
#include <utility>

using namespace llvm;

#define DEBUG_TYPE "si-annotate-control-flow"

namespace {

// Complex types used in this pass
using StackEntry = std::pair<BasicBlock *, Value *>;
using StackVector = SmallVector<StackEntry, 16>;

class SIAnnotateControlFlow : public FunctionPass {
  LegacyDivergenceAnalysis *DA;

Type *Boolean;
  Type *Void;
  Type *IntMask;
  Type *ReturnStruct;

ConstantInt *BoolTrue;
  ConstantInt *BoolFalse;
  UndefValue *BoolUndef;
  Constant *IntMaskZero;

Function *If;
  Function *Else;
  Function *IfBreak;
  Function *Loop;
  Function *EndCf;

DominatorTree *DT;
  StackVector Stack;

LoopInfo *LI;

void initialize(Module &M, const GCNSubtarget &ST);

bool isUniform(BranchInst *T);

bool isTopOfStack(BasicBlock *BB);

Value *popSaved();

void push(BasicBlock *BB, Value *Saved);

bool isElse(PHINode *Phi);

void eraseIfUnused(PHINode *Phi);

void openIf(BranchInst *Term);

void insertElse(BranchInst *Term);

Value *
  handleLoopCondition(Value *Cond, PHINode *Broken, llvm::Loop *L,
                      BranchInst *Term);

void handleLoop(BranchInst *Term);

void closeControlFlow(BasicBlock *BB);

public:
  static char ID;

SIAnnotateControlFlow() : FunctionPass(ID) {}

bool runOnFunction(Function &F) override;

StringRef getPassName() const override { return "SI annotate control flow"; }

void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.addRequired<LoopInfoWrapperPass>();
    AU.addRequired<DominatorTreeWrapperPass>();
    AU.addRequired<LegacyDivergenceAnalysis>();
    AU.addPreserved<DominatorTreeWrapperPass>();
    AU.addRequired<TargetPassConfig>();
    FunctionPass::getAnalysisUsage(AU);
  }
};

} // end anonymous namespace

INITIALIZE_PASS_BEGIN(SIAnnotateControlFlow, DEBUG_TYPE,
                      "Annotate SI Control Flow", false, false)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(LegacyDivergenceAnalysis)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_END(SIAnnotateControlFlow, DEBUG_TYPE,
                    "Annotate SI Control Flow", false, false)

char SIAnnotateControlFlow::ID = 0;

/// Initialize all the types and constants used in the pass
void SIAnnotateControlFlow::initialize(Module &M, const GCNSubtarget &ST) {
  LLVMContext &Context = M.getContext();

Void = Type::getVoidTy(Context);
  Boolean = Type::getInt1Ty(Context);
  IntMask = ST.isWave32() ? Type::getInt32Ty(Context)
                           : Type::getInt64Ty(Context);
  ReturnStruct = StructType::get(Boolean, IntMask);

BoolTrue = ConstantInt::getTrue(Context);
  BoolFalse = ConstantInt::getFalse(Context);
  BoolUndef = UndefValue::get(Boolean);
  IntMaskZero = ConstantInt::get(IntMask, 0);

If = Intrinsic::getDeclaration(&M, Intrinsic::amdgcn_if, { IntMask });
  Else = Intrinsic::getDeclaration(&M, Intrinsic::amdgcn_else,
                                   { IntMask, IntMask });
  IfBreak = Intrinsic::getDeclaration(&M, Intrinsic::amdgcn_if_break,
                                      { IntMask });
  Loop = Intrinsic::getDeclaration(&M, Intrinsic::amdgcn_loop, { IntMask });
  EndCf = Intrinsic::getDeclaration(&M, Intrinsic::amdgcn_end_cf, { IntMask });
}

/// Is the branch condition uniform or did the StructurizeCFG pass
/// consider it as such?
bool SIAnnotateControlFlow::isUniform(BranchInst *T) {
  return DA->isUniform(T) ||
         T->getMetadata("structurizecfg.uniform") != nullptr;
}

/// Is BB the last block saved on the stack ?
bool SIAnnotateControlFlow::isTopOfStack(BasicBlock *BB) {
  return !Stack.empty() && Stack.back().first == BB;
}

/// Pop the last saved value from the control flow stack
Value *SIAnnotateControlFlow::popSaved() {
  return Stack.pop_back_val().second;
}

/// Push a BB and saved value to the control flow stack
void SIAnnotateControlFlow::push(BasicBlock *BB, Value *Saved) {
  Stack.push_back(std::make_pair(BB, Saved));
}

/// Can the condition represented by this PHI node treated like
/// an "Else" block?
bool SIAnnotateControlFlow::isElse(PHINode *Phi) {
  BasicBlock *IDom = DT->getNode(Phi->getParent())->getIDom()->getBlock();
  for (unsigned i = 0, e = Phi->getNumIncomingValues(); i != e; ++i) {
    if (Phi->getIncomingBlock(i) == IDom) {

if (Phi->getIncomingValue(i) != BoolTrue)
        return false;

} else {
      if (Phi->getIncomingValue(i) != BoolFalse)
        return false;

}
  }
  return true;
}

// Erase "Phi" if it is not used any more
void SIAnnotateControlFlow::eraseIfUnused(PHINode *Phi) {
  if (RecursivelyDeleteDeadPHINode(Phi)) {
    LLVM_DEBUG(dbgs() << "Erased unused condition phi\n");
  }
}

/// Open a new "If" block
void SIAnnotateControlFlow::openIf(BranchInst *Term) {
  if (isUniform(Term))
    return;

Value *Ret = CallInst::Create(If, Term->getCondition(), "", Term);
  Term->setCondition(ExtractValueInst::Create(Ret, 0, "", Term));
  push(Term->getSuccessor(1), ExtractValueInst::Create(Ret, 1, "", Term));
}

/// Close the last "If" block and open a new "Else" block
void SIAnnotateControlFlow::insertElse(BranchInst *Term) {
  if (isUniform(Term)) {
    return;
  }
  Value *Ret = CallInst::Create(Else, popSaved(), "", Term);
  Term->setCondition(ExtractValueInst::Create(Ret, 0, "", Term));
  push(Term->getSuccessor(1), ExtractValueInst::Create(Ret, 1, "", Term));
}

/// Recursively handle the condition leading to a loop
Value *SIAnnotateControlFlow::handleLoopCondition(
    Value *Cond, PHINode *Broken, llvm::Loop *L, BranchInst *Term) {
  if (Instruction *Inst = dyn_cast<Instruction>(Cond)) {
    BasicBlock *Parent = Inst->getParent();
    Instruction *Insert;
    if (L->contains(Inst)) {
      Insert = Parent->getTerminator();
    } else {
      Insert = L->getHeader()->getFirstNonPHIOrDbgOrLifetime();
    }

Value *Args[] = { Cond, Broken };
    return CallInst::Create(IfBreak, Args, "", Insert);
  }

// Insert IfBreak in the loop header TERM for constant COND other than true.
  if (isa<Constant>(Cond)) {
    Instruction *Insert = Cond == BoolTrue ?
      Term : L->getHeader()->getTerminator();

Value *Args[] = { Cond, Broken };
    return CallInst::Create(IfBreak, Args, "", Insert);
  }

llvm_unreachable("Unhandled loop condition!");
}

/// Handle a back edge (loop)
void SIAnnotateControlFlow::handleLoop(BranchInst *Term) {
  if (isUniform(Term))
    return;

BasicBlock *BB = Term->getParent();
  llvm::Loop *L = LI->getLoopFor(BB);
  if (!L)
    return;

BasicBlock *Target = Term->getSuccessor(1);
  PHINode *Broken = PHINode::Create(IntMask, 0, "phi.broken", &Target->front());

Value *Cond = Term->getCondition();
  Term->setCondition(BoolTrue);
  Value *Arg = handleLoopCondition(Cond, Broken, L, Term);

for (BasicBlock *Pred : predecessors(Target)) {
    Value *PHIValue = IntMaskZero;
    if (Pred == BB) // Remember the value of the previous iteration.
      PHIValue = Arg;
    // If the backedge from Pred to Target could be executed before the exit
    // of the loop at BB, it should not reset or change "Broken", which keeps
    // track of the number of threads exited the loop at BB.
    else if (L->contains(Pred) && DT->dominates(Pred, BB))
      PHIValue = Broken;
    Broken->addIncoming(PHIValue, Pred);
  }

Term->setCondition(CallInst::Create(Loop, Arg, "", Term));

push(Term->getSuccessor(0), Arg);
}

/// Close the last opened control flow
void SIAnnotateControlFlow::closeControlFlow(BasicBlock *BB) {
  llvm::Loop *L = LI->getLoopFor(BB);

assert(Stack.back().first == BB);

if (L && L->getHeader() == BB) {
    // We can't insert an EndCF call into a loop header, because it will
    // get executed on every iteration of the loop, when it should be
    // executed only once before the loop.
    SmallVector <BasicBlock *, 8> Latches;
    L->getLoopLatches(Latches);

SmallVector<BasicBlock *, 2> Preds;
    for (BasicBlock *Pred : predecessors(BB)) {
      if (!is_contained(Latches, Pred))
        Preds.push_back(Pred);
    }

BB = SplitBlockPredecessors(BB, Preds, "endcf.split", DT, LI, nullptr,
                                false);
  }

Value *Exec = popSaved();
  Instruction *FirstInsertionPt = &*BB->getFirstInsertionPt();
  if (!isa<UndefValue>(Exec) && !isa<UnreachableInst>(FirstInsertionPt))
    CallInst::Create(EndCf, Exec, "", FirstInsertionPt);
}

/// Annotate the control flow with intrinsics so the backend can
/// recognize if/then/else and loops.
bool SIAnnotateControlFlow::runOnFunction(Function &F) {
  DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
  LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
  DA = &getAnalysis<LegacyDivergenceAnalysis>();
  TargetPassConfig &TPC = getAnalysis<TargetPassConfig>();
  const TargetMachine &TM = TPC.getTM<TargetMachine>();

initialize(*F.getParent(), TM.getSubtarget<GCNSubtarget>(F));

for (df_iterator<BasicBlock *> I = df_begin(&F.getEntryBlock()),
       E = df_end(&F.getEntryBlock()); I != E; ++I) {
    BasicBlock *BB = *I;
    BranchInst *Term = dyn_cast<BranchInst>(BB->getTerminator());

if (!Term || Term->isUnconditional()) {
      if (isTopOfStack(BB))
        closeControlFlow(BB);

continue;
    }

if (I.nodeVisited(Term->getSuccessor(1))) {
      if (isTopOfStack(BB))
        closeControlFlow(BB);

handleLoop(Term);
      continue;
    }

if (isTopOfStack(BB)) {
      PHINode *Phi = dyn_cast<PHINode>(Term->getCondition());
      if (Phi && Phi->getParent() == BB && isElse(Phi)) {
        insertElse(Term);
        eraseIfUnused(Phi);
        continue;
      }

closeControlFlow(BB);
    }

openIf(Term);
  }

if (!Stack.empty()) {
    // CFG was probably not structured.
    report_fatal_error("failed to annotate CFG");
  }

return true;
}

/// Create the annotation pass
FunctionPass *llvm::createSIAnnotateControlFlowPass() {
  return new SIAnnotateControlFlow();
}

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Editing: SIAnnotateControlFlow.cpp

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