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📄 AggressiveAntiDepBreaker.cpp(37.23 KB)
📄 AggressiveAntiDepBreaker.h(6.8 KB)
📄 AllocationOrder.cpp(1.96 KB)
📄 AllocationOrder.h(2.96 KB)
📄 Analysis.cpp(32.62 KB)
📁 AsmPrinter
📄 AtomicExpandPass.cpp(71.86 KB)
📄 BBSectionsPrepare.cpp(18.8 KB)
📄 BasicTargetTransformInfo.cpp(1.53 KB)
📄 BranchFolding.cpp(77.92 KB)
📄 BranchFolding.h(7.36 KB)
📄 BranchRelaxation.cpp(19.45 KB)
📄 BreakFalseDeps.cpp(9.79 KB)
📄 BuiltinGCs.cpp(4.88 KB)
📄 CFGuardLongjmp.cpp(3.73 KB)
📄 CFIInstrInserter.cpp(17.53 KB)
📄 CalcSpillWeights.cpp(10.22 KB)
📄 CallingConvLower.cpp(10.4 KB)
📄 CodeGen.cpp(5.28 KB)
📄 CodeGenPrepare.cpp(295.01 KB)
📄 CommandFlags.cpp(24.89 KB)
📄 CriticalAntiDepBreaker.cpp(27.91 KB)
📄 CriticalAntiDepBreaker.h(4.22 KB)
📄 DFAPacketizer.cpp(10.91 KB)
📄 DeadMachineInstructionElim.cpp(6.52 KB)
📄 DetectDeadLanes.cpp(20.74 KB)
📄 DwarfEHPrepare.cpp(9.01 KB)
📄 EarlyIfConversion.cpp(37.51 KB)
📄 EdgeBundles.cpp(3.21 KB)
📄 ExecutionDomainFix.cpp(14.67 KB)
📄 ExpandMemCmp.cpp(33.66 KB)
📄 ExpandPostRAPseudos.cpp(7.28 KB)
📄 ExpandReductions.cpp(7.23 KB)
📄 FEntryInserter.cpp(1.81 KB)
📄 FaultMaps.cpp(4.99 KB)
📄 FinalizeISel.cpp(2.65 KB)
📄 FixupStatepointCallerSaved.cpp(11.06 KB)
📄 FuncletLayout.cpp(2.21 KB)
📄 GCMetadata.cpp(5.1 KB)
📄 GCMetadataPrinter.cpp(748 B)
📄 GCRootLowering.cpp(11.46 KB)
📄 GCStrategy.cpp(708 B)
📁 GlobalISel
📄 GlobalMerge.cpp(24.52 KB)
📄 HardwareLoops.cpp(18.44 KB)
📄 IfConversion.cpp(89.43 KB)
📄 ImplicitNullChecks.cpp(25.14 KB)
📄 IndirectBrExpandPass.cpp(7.79 KB)
📄 InlineSpiller.cpp(58.24 KB)
📄 InterferenceCache.cpp(8.83 KB)
📄 InterferenceCache.h(7.22 KB)
📄 InterleavedAccessPass.cpp(16.59 KB)
📄 InterleavedLoadCombinePass.cpp(42.35 KB)
📄 IntrinsicLowering.cpp(17.08 KB)
📄 LLVMTargetMachine.cpp(10.25 KB)
📄 LatencyPriorityQueue.cpp(5.64 KB)
📄 LazyMachineBlockFrequencyInfo.cpp(3.36 KB)
📄 LexicalScopes.cpp(12.16 KB)
📄 LiveDebugValues.cpp(78.98 KB)
📄 LiveDebugVariables.cpp(51.79 KB)
📄 LiveDebugVariables.h(2.15 KB)
📄 LiveInterval.cpp(46.67 KB)
📄 LiveIntervalCalc.cpp(7.62 KB)
📄 LiveIntervalUnion.cpp(6.36 KB)
📄 LiveIntervals.cpp(64.59 KB)
📄 LivePhysRegs.cpp(11.08 KB)
📄 LiveRangeCalc.cpp(15.72 KB)
📄 LiveRangeEdit.cpp(17.03 KB)
📄 LiveRangeShrink.cpp(8.69 KB)
📄 LiveRangeUtils.h(2.12 KB)
📄 LiveRegMatrix.cpp(7.47 KB)
📄 LiveRegUnits.cpp(4.72 KB)
📄 LiveStacks.cpp(2.95 KB)
📄 LiveVariables.cpp(30.26 KB)
📄 LocalStackSlotAllocation.cpp(17.26 KB)
📄 LoopTraversal.cpp(2.89 KB)
📄 LowLevelType.cpp(1.93 KB)
📄 LowerEmuTLS.cpp(5.66 KB)
📄 MBFIWrapper.cpp(1.57 KB)
📄 MIRCanonicalizerPass.cpp(12.46 KB)
📄 MIRNamerPass.cpp(2.16 KB)
📁 MIRParser
📄 MIRPrinter.cpp(32.67 KB)
📄 MIRPrintingPass.cpp(1.99 KB)
📄 MIRVRegNamerUtils.cpp(6.04 KB)
📄 MIRVRegNamerUtils.h(3.25 KB)
📄 MachineBasicBlock.cpp(50.47 KB)
📄 MachineBlockFrequencyInfo.cpp(10.13 KB)
📄 MachineBlockPlacement.cpp(137.61 KB)
📄 MachineBranchProbabilityInfo.cpp(3.5 KB)
📄 MachineCSE.cpp(31.82 KB)
📄 MachineCombiner.cpp(28.13 KB)
📄 MachineCopyPropagation.cpp(29.21 KB)
📄 MachineDebugify.cpp(6.47 KB)
📄 MachineDominanceFrontier.cpp(1.83 KB)
📄 MachineDominators.cpp(4.86 KB)
📄 MachineFrameInfo.cpp(9.77 KB)
📄 MachineFunction.cpp(42.97 KB)
📄 MachineFunctionPass.cpp(4.78 KB)
📄 MachineFunctionPrinterPass.cpp(2.3 KB)
📄 MachineInstr.cpp(76.39 KB)
📄 MachineInstrBundle.cpp(11.49 KB)
📄 MachineLICM.cpp(57.05 KB)
📄 MachineLoopInfo.cpp(4.98 KB)
📄 MachineLoopUtils.cpp(5.16 KB)
📄 MachineModuleInfo.cpp(9.9 KB)
📄 MachineModuleInfoImpls.cpp(1.5 KB)
📄 MachineOperand.cpp(39.6 KB)
📄 MachineOptimizationRemarkEmitter.cpp(3.29 KB)
📄 MachineOutliner.cpp(42.13 KB)
📄 MachinePipeliner.cpp(111.33 KB)
📄 MachinePostDominators.cpp(2.42 KB)
📄 MachineRegionInfo.cpp(4.75 KB)
📄 MachineRegisterInfo.cpp(22.97 KB)
📄 MachineSSAUpdater.cpp(12.99 KB)
📄 MachineScheduler.cpp(136.89 KB)
📄 MachineSink.cpp(51.94 KB)
📄 MachineSizeOpts.cpp(8.76 KB)
📄 MachineStripDebug.cpp(3.76 KB)
📄 MachineTraceMetrics.cpp(49.58 KB)
📄 MachineVerifier.cpp(107.98 KB)
📄 MacroFusion.cpp(7.55 KB)
📄 ModuloSchedule.cpp(85.09 KB)
📄 NonRelocatableStringpool.cpp(1.65 KB)
📄 OptimizePHIs.cpp(6.7 KB)
📄 PHIElimination.cpp(27.73 KB)
📄 PHIEliminationUtils.cpp(2.56 KB)
📄 PHIEliminationUtils.h(972 B)
📄 ParallelCG.cpp(3.71 KB)
📄 PatchableFunction.cpp(3.44 KB)
📄 PeepholeOptimizer.cpp(78.41 KB)
📄 PostRAHazardRecognizer.cpp(3.5 KB)
📄 PostRASchedulerList.cpp(24.31 KB)
📄 PreISelIntrinsicLowering.cpp(7.91 KB)
📄 ProcessImplicitDefs.cpp(5.4 KB)
📄 PrologEpilogInserter.cpp(50.45 KB)
📄 PseudoSourceValue.cpp(4.71 KB)
📄 RDFGraph.cpp(58.39 KB)
📄 RDFLiveness.cpp(40.7 KB)
📄 RDFRegisters.cpp(11.29 KB)
📄 ReachingDefAnalysis.cpp(21.74 KB)
📄 RegAllocBase.cpp(6.31 KB)
📄 RegAllocBase.h(4.63 KB)
📄 RegAllocBasic.cpp(11.33 KB)
📄 RegAllocFast.cpp(45.78 KB)
📄 RegAllocGreedy.cpp(123.32 KB)
📄 RegAllocPBQP.cpp(33.14 KB)
📄 RegUsageInfoCollector.cpp(7.39 KB)
📄 RegUsageInfoPropagate.cpp(5.07 KB)
📄 RegisterClassInfo.cpp(6.62 KB)
📄 RegisterCoalescer.cpp(151.71 KB)
📄 RegisterCoalescer.h(4.04 KB)
📄 RegisterPressure.cpp(48.86 KB)
📄 RegisterScavenging.cpp(27.48 KB)
📄 RegisterUsageInfo.cpp(3.18 KB)
📄 RenameIndependentSubregs.cpp(14.79 KB)
📄 ResetMachineFunctionPass.cpp(3.48 KB)
📄 SafeStack.cpp(34.12 KB)
📄 SafeStackLayout.cpp(5.3 KB)
📄 SafeStackLayout.h(2.41 KB)
📄 ScalarizeMaskedMemIntrin.cpp(31.46 KB)
📄 ScheduleDAG.cpp(21.34 KB)
📄 ScheduleDAGInstrs.cpp(54.59 KB)
📄 ScheduleDAGPrinter.cpp(3.21 KB)
📄 ScoreboardHazardRecognizer.cpp(7.96 KB)
📁 SelectionDAG
📄 ShadowStackGCLowering.cpp(14.16 KB)
📄 ShrinkWrap.cpp(23.03 KB)
📄 SjLjEHPrepare.cpp(18.93 KB)
📄 SlotIndexes.cpp(9.35 KB)
📄 SpillPlacement.cpp(12.58 KB)
📄 SpillPlacement.h(6.67 KB)
📄 SplitKit.cpp(66.39 KB)
📄 SplitKit.h(23.7 KB)
📄 StackColoring.cpp(49.03 KB)
📄 StackMapLivenessAnalysis.cpp(6.16 KB)
📄 StackMaps.cpp(19.74 KB)
📄 StackProtector.cpp(22.94 KB)
📄 StackSlotColoring.cpp(17.12 KB)
📄 SwiftErrorValueTracking.cpp(11.37 KB)
📄 SwitchLoweringUtils.cpp(18.33 KB)
📄 TailDuplication.cpp(3.32 KB)
📄 TailDuplicator.cpp(38.29 KB)
📄 TargetFrameLoweringImpl.cpp(6.24 KB)
📄 TargetInstrInfo.cpp(51.1 KB)
📄 TargetLoweringBase.cpp(82.53 KB)
📄 TargetLoweringObjectFileImpl.cpp(80.52 KB)
📄 TargetOptionsImpl.cpp(2 KB)
📄 TargetPassConfig.cpp(48.89 KB)
📄 TargetRegisterInfo.cpp(19.15 KB)
📄 TargetSchedule.cpp(13.16 KB)
📄 TargetSubtargetInfo.cpp(1.89 KB)
📄 TwoAddressInstructionPass.cpp(62.08 KB)
📄 TypePromotion.cpp(32.46 KB)
📄 UnreachableBlockElim.cpp(7.48 KB)
📄 ValueTypes.cpp(19.87 KB)
📄 VirtRegMap.cpp(21.4 KB)
📄 WasmEHPrepare.cpp(17.48 KB)
📄 WinEHPrepare.cpp(51.16 KB)
📄 XRayInstrumentation.cpp(9.66 KB)

Editing: IntrinsicLowering.cpp

//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
//
// 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 file implements the IntrinsicLowering class.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

/// This function is used when we want to lower an intrinsic call to a call of
/// an external function. This handles hard cases such as when there was already
/// a prototype for the external function, but that prototype doesn't match the
/// arguments we expect to pass in.
template <class ArgIt>
static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
                                 ArgIt ArgBegin, ArgIt ArgEnd,
                                 Type *RetTy) {
  // If we haven't already looked up this function, check to see if the
  // program already contains a function with this name.
  Module *M = CI->getModule();
  // Get or insert the definition now.
  std::vector<Type *> ParamTys;
  for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
    ParamTys.push_back((*I)->getType());
  FunctionCallee FCache =
      M->getOrInsertFunction(NewFn, FunctionType::get(RetTy, ParamTys, false));

IRBuilder<> Builder(CI->getParent(), CI->getIterator());
  SmallVector<Value *, 8> Args(ArgBegin, ArgEnd);
  CallInst *NewCI = Builder.CreateCall(FCache, Args);
  NewCI->setName(CI->getName());
  if (!CI->use_empty())
    CI->replaceAllUsesWith(NewCI);
  return NewCI;
}

/// Emit the code to lower bswap of V before the specified instruction IP.
static Value *LowerBSWAP(LLVMContext &Context, Value *V, Instruction *IP) {
  assert(V->getType()->isIntOrIntVectorTy() && "Can't bswap a non-integer type!");

unsigned BitSize = V->getType()->getScalarSizeInBits();

IRBuilder<> Builder(IP);

switch(BitSize) {
  default: llvm_unreachable("Unhandled type size of value to byteswap!");
  case 16: {
    Value *Tmp1 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
                                    "bswap.2");
    Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
                                     "bswap.1");
    V = Builder.CreateOr(Tmp1, Tmp2, "bswap.i16");
    break;
  }
  case 32: {
    Value *Tmp4 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
                                    "bswap.4");
    Value *Tmp3 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
                                    "bswap.3");
    Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
                                     "bswap.2");
    Value *Tmp1 = Builder.CreateLShr(V,ConstantInt::get(V->getType(), 24),
                                     "bswap.1");
    Tmp3 = Builder.CreateAnd(Tmp3,
                         ConstantInt::get(V->getType(), 0xFF0000),
                             "bswap.and3");
    Tmp2 = Builder.CreateAnd(Tmp2,
                           ConstantInt::get(V->getType(), 0xFF00),
                             "bswap.and2");
    Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or1");
    Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or2");
    V = Builder.CreateOr(Tmp4, Tmp2, "bswap.i32");
    break;
  }
  case 64: {
    Value *Tmp8 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 56),
                                    "bswap.8");
    Value *Tmp7 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 40),
                                    "bswap.7");
    Value *Tmp6 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
                                    "bswap.6");
    Value *Tmp5 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
                                    "bswap.5");
    Value* Tmp4 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
                                     "bswap.4");
    Value* Tmp3 = Builder.CreateLShr(V,
                                     ConstantInt::get(V->getType(), 24),
                                     "bswap.3");
    Value* Tmp2 = Builder.CreateLShr(V,
                                     ConstantInt::get(V->getType(), 40),
                                     "bswap.2");
    Value* Tmp1 = Builder.CreateLShr(V,
                                     ConstantInt::get(V->getType(), 56),
                                     "bswap.1");
    Tmp7 = Builder.CreateAnd(Tmp7,
                             ConstantInt::get(V->getType(),
                                              0xFF000000000000ULL),
                             "bswap.and7");
    Tmp6 = Builder.CreateAnd(Tmp6,
                             ConstantInt::get(V->getType(),
                                              0xFF0000000000ULL),
                             "bswap.and6");
    Tmp5 = Builder.CreateAnd(Tmp5,
                        ConstantInt::get(V->getType(),
                             0xFF00000000ULL),
                             "bswap.and5");
    Tmp4 = Builder.CreateAnd(Tmp4,
                        ConstantInt::get(V->getType(),
                             0xFF000000ULL),
                             "bswap.and4");
    Tmp3 = Builder.CreateAnd(Tmp3,
                             ConstantInt::get(V->getType(),
                             0xFF0000ULL),
                             "bswap.and3");
    Tmp2 = Builder.CreateAnd(Tmp2,
                             ConstantInt::get(V->getType(),
                             0xFF00ULL),
                             "bswap.and2");
    Tmp8 = Builder.CreateOr(Tmp8, Tmp7, "bswap.or1");
    Tmp6 = Builder.CreateOr(Tmp6, Tmp5, "bswap.or2");
    Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or3");
    Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or4");
    Tmp8 = Builder.CreateOr(Tmp8, Tmp6, "bswap.or5");
    Tmp4 = Builder.CreateOr(Tmp4, Tmp2, "bswap.or6");
    V = Builder.CreateOr(Tmp8, Tmp4, "bswap.i64");
    break;
  }
  }
  return V;
}

/// Emit the code to lower ctpop of V before the specified instruction IP.
static Value *LowerCTPOP(LLVMContext &Context, Value *V, Instruction *IP) {
  assert(V->getType()->isIntegerTy() && "Can't ctpop a non-integer type!");

static const uint64_t MaskValues[6] = {
    0x5555555555555555ULL, 0x3333333333333333ULL,
    0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
    0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
  };

IRBuilder<> Builder(IP);

unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
  unsigned WordSize = (BitSize + 63) / 64;
  Value *Count = ConstantInt::get(V->getType(), 0);

for (unsigned n = 0; n < WordSize; ++n) {
    Value *PartValue = V;
    for (unsigned i = 1, ct = 0; i < (BitSize>64 ? 64 : BitSize);
         i <<= 1, ++ct) {
      Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
      Value *LHS = Builder.CreateAnd(PartValue, MaskCst, "cppop.and1");
      Value *VShift = Builder.CreateLShr(PartValue,
                                        ConstantInt::get(V->getType(), i),
                                         "ctpop.sh");
      Value *RHS = Builder.CreateAnd(VShift, MaskCst, "cppop.and2");
      PartValue = Builder.CreateAdd(LHS, RHS, "ctpop.step");
    }
    Count = Builder.CreateAdd(PartValue, Count, "ctpop.part");
    if (BitSize > 64) {
      V = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 64),
                             "ctpop.part.sh");
      BitSize -= 64;
    }
  }

return Count;
}

/// Emit the code to lower ctlz of V before the specified instruction IP.
static Value *LowerCTLZ(LLVMContext &Context, Value *V, Instruction *IP) {

IRBuilder<> Builder(IP);

unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
  for (unsigned i = 1; i < BitSize; i <<= 1) {
    Value *ShVal = ConstantInt::get(V->getType(), i);
    ShVal = Builder.CreateLShr(V, ShVal, "ctlz.sh");
    V = Builder.CreateOr(V, ShVal, "ctlz.step");
  }

V = Builder.CreateNot(V);
  return LowerCTPOP(Context, V, IP);
}

static void ReplaceFPIntrinsicWithCall(CallInst *CI, const char *Fname,
                                       const char *Dname,
                                       const char *LDname) {
  switch (CI->getArgOperand(0)->getType()->getTypeID()) {
  default: llvm_unreachable("Invalid type in intrinsic");
  case Type::FloatTyID:
    ReplaceCallWith(Fname, CI, CI->arg_begin(), CI->arg_end(),
                    Type::getFloatTy(CI->getContext()));
    break;
  case Type::DoubleTyID:
    ReplaceCallWith(Dname, CI, CI->arg_begin(), CI->arg_end(),
                    Type::getDoubleTy(CI->getContext()));
    break;
  case Type::X86_FP80TyID:
  case Type::FP128TyID:
  case Type::PPC_FP128TyID:
    ReplaceCallWith(LDname, CI, CI->arg_begin(), CI->arg_end(),
                    CI->getArgOperand(0)->getType());
    break;
  }
}

void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
  IRBuilder<> Builder(CI);
  LLVMContext &Context = CI->getContext();

const Function *Callee = CI->getCalledFunction();
  assert(Callee && "Cannot lower an indirect call!");

switch (Callee->getIntrinsicID()) {
  case Intrinsic::not_intrinsic:
    report_fatal_error("Cannot lower a call to a non-intrinsic function '"+
                      Callee->getName() + "'!");
  default:
    report_fatal_error("Code generator does not support intrinsic function '"+
                      Callee->getName()+"'!");

case Intrinsic::expect: {
    // Just replace __builtin_expect(exp, c) with EXP.
    Value *V = CI->getArgOperand(0);
    CI->replaceAllUsesWith(V);
    break;
  }

case Intrinsic::ctpop:
    CI->replaceAllUsesWith(LowerCTPOP(Context, CI->getArgOperand(0), CI));
    break;

case Intrinsic::bswap:
    CI->replaceAllUsesWith(LowerBSWAP(Context, CI->getArgOperand(0), CI));
    break;

case Intrinsic::ctlz:
    CI->replaceAllUsesWith(LowerCTLZ(Context, CI->getArgOperand(0), CI));
    break;

case Intrinsic::cttz: {
    // cttz(x) -> ctpop(~X & (X-1))
    Value *Src = CI->getArgOperand(0);
    Value *NotSrc = Builder.CreateNot(Src);
    NotSrc->setName(Src->getName() + ".not");
    Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
    SrcM1 = Builder.CreateSub(Src, SrcM1);
    Src = LowerCTPOP(Context, Builder.CreateAnd(NotSrc, SrcM1), CI);
    CI->replaceAllUsesWith(Src);
    break;
  }

case Intrinsic::stacksave:
  case Intrinsic::stackrestore: {
    if (!Warned)
      errs() << "WARNING: this target does not support the llvm.stack"
             << (Callee->getIntrinsicID() == Intrinsic::stacksave ?
               "save" : "restore") << " intrinsic.\n";
    Warned = true;
    if (Callee->getIntrinsicID() == Intrinsic::stacksave)
      CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
    break;
  }

case Intrinsic::get_dynamic_area_offset:
    errs() << "WARNING: this target does not support the custom llvm.get."
              "dynamic.area.offset.  It is being lowered to a constant 0\n";
    // Just lower it to a constant 0 because for most targets
    // @llvm.get.dynamic.area.offset is lowered to zero.
    CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 0));
    break;
  case Intrinsic::returnaddress:
  case Intrinsic::frameaddress:
    errs() << "WARNING: this target does not support the llvm."
           << (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
             "return" : "frame") << "address intrinsic.\n";
    CI->replaceAllUsesWith(
        ConstantPointerNull::get(cast<PointerType>(CI->getType())));
    break;
  case Intrinsic::addressofreturnaddress:
    errs() << "WARNING: this target does not support the "
              "llvm.addressofreturnaddress intrinsic.\n";
    CI->replaceAllUsesWith(
        ConstantPointerNull::get(cast<PointerType>(CI->getType())));
    break;

case Intrinsic::prefetch:
    break;    // Simply strip out prefetches on unsupported architectures

case Intrinsic::pcmarker:
    break;    // Simply strip out pcmarker on unsupported architectures
  case Intrinsic::readcyclecounter: {
    errs() << "WARNING: this target does not support the llvm.readcyclecoun"
           << "ter intrinsic.  It is being lowered to a constant 0\n";
    CI->replaceAllUsesWith(ConstantInt::get(Type::getInt64Ty(Context), 0));
    break;
  }

case Intrinsic::dbg_declare:
  case Intrinsic::dbg_label:
    break;    // Simply strip out debugging intrinsics

case Intrinsic::eh_typeid_for:
    // Return something different to eh_selector.
    CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
    break;

case Intrinsic::annotation:
  case Intrinsic::ptr_annotation:
    // Just drop the annotation, but forward the value
    CI->replaceAllUsesWith(CI->getOperand(0));
    break;

case Intrinsic::assume:
  case Intrinsic::var_annotation:
    break;   // Strip out these intrinsics

case Intrinsic::memcpy: {
    Type *IntPtr = DL.getIntPtrType(Context);
    Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
                                        /* isSigned */ false);
    Value *Ops[3];
    Ops[0] = CI->getArgOperand(0);
    Ops[1] = CI->getArgOperand(1);
    Ops[2] = Size;
    ReplaceCallWith("memcpy", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
    break;
  }
  case Intrinsic::memmove: {
    Type *IntPtr = DL.getIntPtrType(Context);
    Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
                                        /* isSigned */ false);
    Value *Ops[3];
    Ops[0] = CI->getArgOperand(0);
    Ops[1] = CI->getArgOperand(1);
    Ops[2] = Size;
    ReplaceCallWith("memmove", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
    break;
  }
  case Intrinsic::memset: {
    Value *Op0 = CI->getArgOperand(0);
    Type *IntPtr = DL.getIntPtrType(Op0->getType());
    Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
                                        /* isSigned */ false);
    Value *Ops[3];
    Ops[0] = Op0;
    // Extend the amount to i32.
    Ops[1] = Builder.CreateIntCast(CI->getArgOperand(1),
                                   Type::getInt32Ty(Context),
                                   /* isSigned */ false);
    Ops[2] = Size;
    ReplaceCallWith("memset", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
    break;
  }
  case Intrinsic::sqrt: {
    ReplaceFPIntrinsicWithCall(CI, "sqrtf", "sqrt", "sqrtl");
    break;
  }
  case Intrinsic::log: {
    ReplaceFPIntrinsicWithCall(CI, "logf", "log", "logl");
    break;
  }
  case Intrinsic::log2: {
    ReplaceFPIntrinsicWithCall(CI, "log2f", "log2", "log2l");
    break;
  }
  case Intrinsic::log10: {
    ReplaceFPIntrinsicWithCall(CI, "log10f", "log10", "log10l");
    break;
  }
  case Intrinsic::exp: {
    ReplaceFPIntrinsicWithCall(CI, "expf", "exp", "expl");
    break;
  }
  case Intrinsic::exp2: {
    ReplaceFPIntrinsicWithCall(CI, "exp2f", "exp2", "exp2l");
    break;
  }
  case Intrinsic::pow: {
    ReplaceFPIntrinsicWithCall(CI, "powf", "pow", "powl");
    break;
  }
  case Intrinsic::sin: {
    ReplaceFPIntrinsicWithCall(CI, "sinf", "sin", "sinl");
    break;
  }
  case Intrinsic::cos: {
    ReplaceFPIntrinsicWithCall(CI, "cosf", "cos", "cosl");
    break;
  }
  case Intrinsic::floor: {
    ReplaceFPIntrinsicWithCall(CI, "floorf", "floor", "floorl");
    break;
  }
  case Intrinsic::ceil: {
    ReplaceFPIntrinsicWithCall(CI, "ceilf", "ceil", "ceill");
    break;
  }
  case Intrinsic::trunc: {
    ReplaceFPIntrinsicWithCall(CI, "truncf", "trunc", "truncl");
    break;
  }
  case Intrinsic::round: {
    ReplaceFPIntrinsicWithCall(CI, "roundf", "round", "roundl");
    break;
  }
  case Intrinsic::roundeven: {
    ReplaceFPIntrinsicWithCall(CI, "roundevenf", "roundeven", "roundevenl");
    break;
  }
  case Intrinsic::copysign: {
    ReplaceFPIntrinsicWithCall(CI, "copysignf", "copysign", "copysignl");
    break;
  }
  case Intrinsic::flt_rounds:
     // Lower to "round to the nearest"
     if (!CI->getType()->isVoidTy())
       CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
     break;
  case Intrinsic::invariant_start:
  case Intrinsic::lifetime_start:
    // Discard region information.
    CI->replaceAllUsesWith(UndefValue::get(CI->getType()));
    break;
  case Intrinsic::invariant_end:
  case Intrinsic::lifetime_end:
    // Discard region information.
    break;
  }

assert(CI->use_empty() &&
         "Lowering should have eliminated any uses of the intrinsic call!");
  CI->eraseFromParent();
}

bool IntrinsicLowering::LowerToByteSwap(CallInst *CI) {
  // Verify this is a simple bswap.
  if (CI->getNumArgOperands() != 1 ||
      CI->getType() != CI->getArgOperand(0)->getType() ||
      !CI->getType()->isIntegerTy())
    return false;

IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
  if (!Ty)
    return false;

// Okay, we can do this xform, do so now.
  Module *M = CI->getModule();
  Function *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Ty);

Value *Op = CI->getArgOperand(0);
  Op = CallInst::Create(Int, Op, CI->getName(), CI);

CI->replaceAllUsesWith(Op);
  CI->eraseFromParent();
  return true;
}

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