File Manager

003 File Manager

Current Path: /usr/src/contrib/llvm-project/llvm/lib/Transforms/Scalar

usr / src / contrib / llvm-project / llvm / lib / Transforms / Scalar /

📁 ..
📄 ADCE.cpp(24.71 KB)
📄 AlignmentFromAssumptions.cpp(15.9 KB)
📄 BDCE.cpp(7.42 KB)
📄 CallSiteSplitting.cpp(21.43 KB)
📄 ConstantHoisting.cpp(38.95 KB)
📄 ConstantProp.cpp(4.13 KB)
📄 CorrelatedValuePropagation.cpp(32.36 KB)
📄 DCE.cpp(6.84 KB)
📄 DeadStoreElimination.cpp(91.51 KB)
📄 DivRemPairs.cpp(15.01 KB)
📄 EarlyCSE.cpp(57.05 KB)
📄 FlattenCFGPass.cpp(2.74 KB)
📄 Float2Int.cpp(18.19 KB)
📄 GVN.cpp(100.11 KB)
📄 GVNHoist.cpp(44.85 KB)
📄 GVNSink.cpp(29.97 KB)
📄 GuardWidening.cpp(32.36 KB)
📄 IVUsersPrinter.cpp(839 B)
📄 IndVarSimplify.cpp(113.49 KB)
📄 InductiveRangeCheckElimination.cpp(72.96 KB)
📄 InferAddressSpaces.cpp(44.22 KB)
📄 InstSimplifyPass.cpp(5.39 KB)
📄 JumpThreading.cpp(115.06 KB)
📄 LICM.cpp(92.71 KB)
📄 LoopAccessAnalysisPrinter.cpp(977 B)
📄 LoopDataPrefetch.cpp(14.54 KB)
📄 LoopDeletion.cpp(11.37 KB)
📄 LoopDistribute.cpp(40.25 KB)
📄 LoopFuse.cpp(68.6 KB)
📄 LoopIdiomRecognize.cpp(69.09 KB)
📄 LoopInstSimplify.cpp(9.38 KB)
📄 LoopInterchange.cpp(60.65 KB)
📄 LoopLoadElimination.cpp(26.71 KB)
📄 LoopPassManager.cpp(4.02 KB)
📄 LoopPredication.cpp(49.21 KB)
📄 LoopRerollPass.cpp(58.54 KB)
📄 LoopRotation.cpp(4.79 KB)
📄 LoopSimplifyCFG.cpp(28.59 KB)
📄 LoopSink.cpp(14.93 KB)
📄 LoopStrengthReduce.cpp(216.88 KB)
📄 LoopUnrollAndJamPass.cpp(21.07 KB)
📄 LoopUnrollPass.cpp(60.73 KB)
📄 LoopUnswitch.cpp(64.17 KB)
📄 LoopVersioningLICM.cpp(23.65 KB)
📄 LowerAtomic.cpp(5.12 KB)
📄 LowerConstantIntrinsics.cpp(5.8 KB)
📄 LowerExpectIntrinsic.cpp(15 KB)
📄 LowerGuardIntrinsic.cpp(2.82 KB)
📄 LowerMatrixIntrinsics.cpp(73.36 KB)
📄 LowerWidenableCondition.cpp(2.75 KB)
📄 MakeGuardsExplicit.cpp(3.83 KB)
📄 MemCpyOptimizer.cpp(52.16 KB)
📄 MergeICmps.cpp(35.61 KB)
📄 MergedLoadStoreMotion.cpp(15.18 KB)
📄 NaryReassociate.cpp(19.86 KB)
📄 NewGVN.cpp(170.95 KB)
📄 PartiallyInlineLibCalls.cpp(6.22 KB)
📄 PlaceSafepoints.cpp(27.5 KB)
📄 Reassociate.cpp(95.61 KB)
📄 Reg2Mem.cpp(4.34 KB)
📄 RewriteStatepointsForGC.cpp(116.35 KB)
📄 SCCP.cpp(76.12 KB)
📄 SROA.cpp(183.83 KB)
📄 Scalar.cpp(10.08 KB)
📄 Scalarizer.cpp(32.93 KB)
📄 SeparateConstOffsetFromGEP.cpp(52.99 KB)
📄 SimpleLoopUnswitch.cpp(124.57 KB)
📄 SimplifyCFGPass.cpp(12.31 KB)
📄 Sink.cpp(10.81 KB)
📄 SpeculateAroundPHIs.cpp(35.69 KB)
📄 SpeculativeExecution.cpp(11.54 KB)
📄 StraightLineStrengthReduce.cpp(28.92 KB)
📄 StructurizeCFG.cpp(32.49 KB)
📄 TailRecursionElimination.cpp(34.9 KB)
📄 WarnMissedTransforms.cpp(6.14 KB)

Editing: MakeGuardsExplicit.cpp

//===- MakeGuardsExplicit.cpp - Turn guard intrinsics into guard branches -===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This pass lowers the @llvm.experimental.guard intrinsic to the new form of
// guard represented as widenable explicit branch to the deopt block. The
// difference between this pass and LowerGuardIntrinsic is that after this pass
// the guard represented as intrinsic:
//
//   call void(i1, ...) @llvm.experimental.guard(i1 %old_cond) [ "deopt"() ]
//
// transforms to a guard represented as widenable explicit branch:
//
//   %widenable_cond = call i1 @llvm.experimental.widenable.condition()
//   br i1 (%old_cond & %widenable_cond), label %guarded, label %deopt
//
// Here:
//   - The semantics of @llvm.experimental.widenable.condition allows to replace
//     %widenable_cond with the construction (%widenable_cond & %any_other_cond)
//     without loss of correctness;
//   - %guarded is the lower part of old guard intrinsic's parent block split by
//     the intrinsic call;
//   - %deopt is a block containing a sole call to @llvm.experimental.deoptimize
//     intrinsic.
//
// Therefore, this branch preserves the property of widenability.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Scalar/MakeGuardsExplicit.h"
#include "llvm/Analysis/GuardUtils.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/GuardUtils.h"

using namespace llvm;

namespace {
struct MakeGuardsExplicitLegacyPass : public FunctionPass {
  static char ID;
  MakeGuardsExplicitLegacyPass() : FunctionPass(ID) {
    initializeMakeGuardsExplicitLegacyPassPass(*PassRegistry::getPassRegistry());
  }

bool runOnFunction(Function &F) override;
};
}

static void turnToExplicitForm(CallInst *Guard, Function *DeoptIntrinsic) {
  // Replace the guard with an explicit branch (just like in GuardWidening).
  BasicBlock *OriginalBB = Guard->getParent();
  (void)OriginalBB;
  makeGuardControlFlowExplicit(DeoptIntrinsic, Guard, true);
  assert(isWidenableBranch(OriginalBB->getTerminator()) && "should hold");

Guard->eraseFromParent();
}

static bool explicifyGuards(Function &F) {
  // Check if we can cheaply rule out the possibility of not having any work to
  // do.
  auto *GuardDecl = F.getParent()->getFunction(
      Intrinsic::getName(Intrinsic::experimental_guard));
  if (!GuardDecl || GuardDecl->use_empty())
    return false;

SmallVector<CallInst *, 8> GuardIntrinsics;
  for (auto &I : instructions(F))
    if (isGuard(&I))
      GuardIntrinsics.push_back(cast<CallInst>(&I));

if (GuardIntrinsics.empty())
    return false;

auto *DeoptIntrinsic = Intrinsic::getDeclaration(
      F.getParent(), Intrinsic::experimental_deoptimize, {F.getReturnType()});
  DeoptIntrinsic->setCallingConv(GuardDecl->getCallingConv());

for (auto *Guard : GuardIntrinsics)
    turnToExplicitForm(Guard, DeoptIntrinsic);

return true;
}

bool MakeGuardsExplicitLegacyPass::runOnFunction(Function &F) {
  return explicifyGuards(F);
}

char MakeGuardsExplicitLegacyPass::ID = 0;
INITIALIZE_PASS(MakeGuardsExplicitLegacyPass, "make-guards-explicit",
                "Lower the guard intrinsic to explicit control flow form",
                false, false)

PreservedAnalyses MakeGuardsExplicitPass::run(Function &F,
                                           FunctionAnalysisManager &) {
  if (explicifyGuards(F))
    return PreservedAnalyses::none();
  return PreservedAnalyses::all();
}

003 File Manager

Editing: MakeGuardsExplicit.cpp

Upload File

Create Folder