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📄 AMDGPUEmitPrintf.cpp(8.57 KB)
📄 ASanStackFrameLayout.cpp(5.75 KB)
📄 AddDiscriminators.cpp(10.78 KB)
📄 AssumeBundleBuilder.cpp(21.46 KB)
📄 BasicBlockUtils.cpp(51.81 KB)
📄 BreakCriticalEdges.cpp(19.03 KB)
📄 BuildLibCalls.cpp(43.9 KB)
📄 BypassSlowDivision.cpp(17.95 KB)
📄 CallGraphUpdater.cpp(5.76 KB)
📄 CallPromotionUtils.cpp(22.18 KB)
📄 CanonicalizeAliases.cpp(3.18 KB)
📄 CanonicalizeFreezeInLoops.cpp(7.93 KB)
📄 CloneFunction.cpp(34.49 KB)
📄 CloneModule.cpp(7.93 KB)
📄 CodeExtractor.cpp(65.69 KB)
📄 CodeMoverUtils.cpp(15.82 KB)
📄 CtorUtils.cpp(5.1 KB)
📄 Debugify.cpp(17.78 KB)
📄 DemoteRegToStack.cpp(6.1 KB)
📄 EntryExitInstrumenter.cpp(5.83 KB)
📄 EscapeEnumerator.cpp(2.96 KB)
📄 Evaluator.cpp(27.98 KB)
📄 FixIrreducible.cpp(12.68 KB)
📄 FlattenCFG.cpp(16.99 KB)
📄 FunctionComparator.cpp(34.36 KB)
📄 FunctionImportUtils.cpp(13.8 KB)
📄 GlobalStatus.cpp(7.23 KB)
📄 GuardUtils.cpp(4.76 KB)
📄 ImportedFunctionsInliningStatistics.cpp(7.67 KB)
📄 InjectTLIMappings.cpp(6.62 KB)
📄 InlineFunction.cpp(103.28 KB)
📄 InstructionNamer.cpp(1.98 KB)
📄 IntegerDivision.cpp(26.17 KB)
📄 LCSSA.cpp(18.72 KB)
📄 LibCallsShrinkWrap.cpp(18.68 KB)
📄 Local.cpp(114.96 KB)
📄 LoopRotationUtils.cpp(29.47 KB)
📄 LoopSimplify.cpp(36.13 KB)
📄 LoopUnroll.cpp(38.07 KB)
📄 LoopUnrollAndJam.cpp(37.71 KB)
📄 LoopUnrollPeel.cpp(31.88 KB)
📄 LoopUnrollRuntime.cpp(40.17 KB)
📄 LoopUtils.cpp(65.03 KB)
📄 LoopVersioning.cpp(12.42 KB)
📄 LowerInvoke.cpp(3.3 KB)
📄 LowerMemIntrinsics.cpp(20.41 KB)
📄 LowerSwitch.cpp(23.46 KB)
📄 Mem2Reg.cpp(3.71 KB)
📄 MetaRenamer.cpp(5.29 KB)
📄 MisExpect.cpp(6.97 KB)
📄 ModuleUtils.cpp(10.99 KB)
📄 NameAnonGlobals.cpp(3.33 KB)
📄 PredicateInfo.cpp(36.79 KB)
📄 PromoteMemoryToRegister.cpp(37.26 KB)
📄 SSAUpdater.cpp(16.72 KB)
📄 SSAUpdaterBulk.cpp(7.46 KB)
📄 SanitizerStats.cpp(4.08 KB)
📄 ScalarEvolutionExpander.cpp(101.25 KB)
📄 SimplifyCFG.cpp(238.13 KB)
📄 SimplifyIndVar.cpp(34.53 KB)
📄 SimplifyLibCalls.cpp(122.25 KB)
📄 SizeOpts.cpp(5.08 KB)
📄 SplitModule.cpp(9.67 KB)
📄 StripGCRelocates.cpp(2.86 KB)
📄 StripNonLineTableDebugInfo.cpp(1.4 KB)
📄 SymbolRewriter.cpp(18.82 KB)
📄 UnifyFunctionExitNodes.cpp(4.42 KB)
📄 UnifyLoopExits.cpp(8.16 KB)
📄 UniqueInternalLinkageNames.cpp(2.91 KB)
📄 Utils.cpp(2.53 KB)
📄 VNCoercion.cpp(25.89 KB)
📄 ValueMapper.cpp(38.06 KB)

Editing: GuardUtils.cpp

//===-- GuardUtils.cpp - Utils for work with guards -------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
// Utils that are used to perform transformations related to guards and their
// conditions.
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Utils/GuardUtils.h"
#include "llvm/Analysis/GuardUtils.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"

using namespace llvm;
using namespace llvm::PatternMatch;

static cl::opt<uint32_t> PredicatePassBranchWeight(
    "guards-predicate-pass-branch-weight", cl::Hidden, cl::init(1 << 20),
    cl::desc("The probability of a guard failing is assumed to be the "
             "reciprocal of this value (default = 1 << 20)"));

void llvm::makeGuardControlFlowExplicit(Function *DeoptIntrinsic,
                                        CallInst *Guard, bool UseWC) {
  OperandBundleDef DeoptOB(*Guard->getOperandBundle(LLVMContext::OB_deopt));
  SmallVector<Value *, 4> Args(std::next(Guard->arg_begin()), Guard->arg_end());

auto *CheckBB = Guard->getParent();
  auto *DeoptBlockTerm =
      SplitBlockAndInsertIfThen(Guard->getArgOperand(0), Guard, true);

auto *CheckBI = cast<BranchInst>(CheckBB->getTerminator());

// SplitBlockAndInsertIfThen inserts control flow that branches to
  // DeoptBlockTerm if the condition is true.  We want the opposite.
  CheckBI->swapSuccessors();

CheckBI->getSuccessor(0)->setName("guarded");
  CheckBI->getSuccessor(1)->setName("deopt");

if (auto *MD = Guard->getMetadata(LLVMContext::MD_make_implicit))
    CheckBI->setMetadata(LLVMContext::MD_make_implicit, MD);

MDBuilder MDB(Guard->getContext());
  CheckBI->setMetadata(LLVMContext::MD_prof,
                       MDB.createBranchWeights(PredicatePassBranchWeight, 1));

IRBuilder<> B(DeoptBlockTerm);
  auto *DeoptCall = B.CreateCall(DeoptIntrinsic, Args, {DeoptOB}, "");

if (DeoptIntrinsic->getReturnType()->isVoidTy()) {
    B.CreateRetVoid();
  } else {
    DeoptCall->setName("deoptcall");
    B.CreateRet(DeoptCall);
  }

DeoptCall->setCallingConv(Guard->getCallingConv());
  DeoptBlockTerm->eraseFromParent();

if (UseWC) {
    // We want the guard to be expressed as explicit control flow, but still be
    // widenable. For that, we add Widenable Condition intrinsic call to the
    // guard's condition.
    IRBuilder<> B(CheckBI);
    auto *WC = B.CreateIntrinsic(Intrinsic::experimental_widenable_condition,
                                 {}, {}, nullptr, "widenable_cond");
    CheckBI->setCondition(B.CreateAnd(CheckBI->getCondition(), WC,
                                      "exiplicit_guard_cond"));
    assert(isWidenableBranch(CheckBI) && "sanity check");
  }
}

void llvm::widenWidenableBranch(BranchInst *WidenableBR, Value *NewCond) {
  assert(isWidenableBranch(WidenableBR) && "precondition");

// The tempting trivially option is to produce something like this:
  // br (and oldcond, newcond) where oldcond is assumed to contain a widenable
  // condition, but that doesn't match the pattern parseWidenableBranch expects
  // so we have to be more sophisticated.

Use *C, *WC;
  BasicBlock *IfTrueBB, *IfFalseBB;
  parseWidenableBranch(WidenableBR, C, WC, IfTrueBB, IfFalseBB);
  if (!C) {
    // br (wc()), ... form
    IRBuilder<> B(WidenableBR);
    WidenableBR->setCondition(B.CreateAnd(NewCond, WC->get()));
  } else {
    // br (wc & C), ... form
    IRBuilder<> B(WidenableBR);
    C->set(B.CreateAnd(NewCond, C->get()));
    Instruction *WCAnd = cast<Instruction>(WidenableBR->getCondition());
    // Condition is only guaranteed to dominate branch
    WCAnd->moveBefore(WidenableBR);    
  }
  assert(isWidenableBranch(WidenableBR) && "preserve widenabiliy");
}

void llvm::setWidenableBranchCond(BranchInst *WidenableBR, Value *NewCond) {
  assert(isWidenableBranch(WidenableBR) && "precondition");

Use *C, *WC;
  BasicBlock *IfTrueBB, *IfFalseBB;
  parseWidenableBranch(WidenableBR, C, WC, IfTrueBB, IfFalseBB);
  if (!C) {
    // br (wc()), ... form
    IRBuilder<> B(WidenableBR);
    WidenableBR->setCondition(B.CreateAnd(NewCond, WC->get()));
  } else {
    // br (wc & C), ... form
    Instruction *WCAnd = cast<Instruction>(WidenableBR->getCondition());
    // Condition is only guaranteed to dominate branch
    WCAnd->moveBefore(WidenableBR);
    C->set(NewCond);
  }
  assert(isWidenableBranch(WidenableBR) && "preserve widenabiliy");
}

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Editing: GuardUtils.cpp

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