third_party/llvm-7.0/llvm/lib/Target/Hexagon/HexagonTargetMachine.cpp - SwiftShader - Git at Google

 //===-- HexagonTargetMachine.cpp - Define TargetMachine for Hexagon -------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Implements the info about Hexagon target spec.
 //
 //===----------------------------------------------------------------------===//

 #include "HexagonTargetMachine.h"
 #include "Hexagon.h"
 #include "HexagonISelLowering.h"
 #include "HexagonMachineScheduler.h"
 #include "HexagonTargetObjectFile.h"
 #include "HexagonTargetTransformInfo.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/IR/LegacyPassManager.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
 #include "llvm/Transforms/Scalar.h"

 using namespace llvm;

 static cl::opt<bool> EnableCExtOpt("hexagon-cext", cl::Hidden, cl::ZeroOrMore,
   cl::init(true), cl::desc("Enable Hexagon constant-extender optimization"));

 static cl::opt<bool> EnableRDFOpt("rdf-opt", cl::Hidden, cl::ZeroOrMore,
   cl::init(true), cl::desc("Enable RDF-based optimizations"));

 static cl::opt<bool> DisableHardwareLoops("disable-hexagon-hwloops",
   cl::Hidden, cl::desc("Disable Hardware Loops for Hexagon target"));

 static cl::opt<bool> DisableAModeOpt("disable-hexagon-amodeopt",
   cl::Hidden, cl::ZeroOrMore, cl::init(false),
   cl::desc("Disable Hexagon Addressing Mode Optimization"));

 static cl::opt<bool> DisableHexagonCFGOpt("disable-hexagon-cfgopt",
   cl::Hidden, cl::ZeroOrMore, cl::init(false),
   cl::desc("Disable Hexagon CFG Optimization"));

 static cl::opt<bool> DisableHCP("disable-hcp", cl::init(false), cl::Hidden,
   cl::ZeroOrMore, cl::desc("Disable Hexagon constant propagation"));

 static cl::opt<bool> DisableStoreWidening("disable-store-widen",
   cl::Hidden, cl::init(false), cl::desc("Disable store widening"));

 static cl::opt<bool> EnableExpandCondsets("hexagon-expand-condsets",
   cl::init(true), cl::Hidden, cl::ZeroOrMore,
   cl::desc("Early expansion of MUX"));

 static cl::opt<bool> EnableEarlyIf("hexagon-eif", cl::init(true), cl::Hidden,
   cl::ZeroOrMore, cl::desc("Enable early if-conversion"));

 static cl::opt<bool> EnableGenInsert("hexagon-insert", cl::init(true),
   cl::Hidden, cl::desc("Generate \"insert\" instructions"));

 static cl::opt<bool> EnableCommGEP("hexagon-commgep", cl::init(true),
   cl::Hidden, cl::ZeroOrMore, cl::desc("Enable commoning of GEP instructions"));

 static cl::opt<bool> EnableGenExtract("hexagon-extract", cl::init(true),
   cl::Hidden, cl::desc("Generate \"extract\" instructions"));

 static cl::opt<bool> EnableGenMux("hexagon-mux", cl::init(true), cl::Hidden,
   cl::desc("Enable converting conditional transfers into MUX instructions"));

 static cl::opt<bool> EnableGenPred("hexagon-gen-pred", cl::init(true),
   cl::Hidden, cl::desc("Enable conversion of arithmetic operations to "
   "predicate instructions"));

 static cl::opt<bool> EnableLoopPrefetch("hexagon-loop-prefetch",
   cl::init(false), cl::Hidden, cl::ZeroOrMore,
   cl::desc("Enable loop data prefetch on Hexagon"));

 static cl::opt<bool> DisableHSDR("disable-hsdr", cl::init(false), cl::Hidden,
   cl::desc("Disable splitting double registers"));

 static cl::opt<bool> EnableBitSimplify("hexagon-bit", cl::init(true),
   cl::Hidden, cl::desc("Bit simplification"));

 static cl::opt<bool> EnableLoopResched("hexagon-loop-resched", cl::init(true),
   cl::Hidden, cl::desc("Loop rescheduling"));

 static cl::opt<bool> HexagonNoOpt("hexagon-noopt", cl::init(false),
   cl::Hidden, cl::desc("Disable backend optimizations"));

 static cl::opt<bool> EnableVectorPrint("enable-hexagon-vector-print",
   cl::Hidden, cl::ZeroOrMore, cl::init(false),
   cl::desc("Enable Hexagon Vector print instr pass"));

 static cl::opt<bool> EnableVExtractOpt("hexagon-opt-vextract", cl::Hidden,
   cl::ZeroOrMore, cl::init(true), cl::desc("Enable vextract optimization"));

 /// HexagonTargetMachineModule - Note that this is used on hosts that
 /// cannot link in a library unless there are references into the
 /// library.  In particular, it seems that it is not possible to get
 /// things to work on Win32 without this.  Though it is unused, do not
 /// remove it.
 extern "C" int HexagonTargetMachineModule;
 int HexagonTargetMachineModule = 0;

 static ScheduleDAGInstrs *createVLIWMachineSched(MachineSchedContext *C) {
   ScheduleDAGMILive *DAG =
     new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
   DAG->addMutation(make_unique<HexagonSubtarget::UsrOverflowMutation>());
   DAG->addMutation(make_unique<HexagonSubtarget::HVXMemLatencyMutation>());
   DAG->addMutation(make_unique<HexagonSubtarget::CallMutation>());
   DAG->addMutation(createCopyConstrainDAGMutation(DAG->TII, DAG->TRI));
   return DAG;
 }

 static MachineSchedRegistry
 SchedCustomRegistry("hexagon", "Run Hexagon's custom scheduler",
                     createVLIWMachineSched);

 namespace llvm {
   extern char &HexagonExpandCondsetsID;
   void initializeHexagonBitSimplifyPass(PassRegistry&);
   void initializeHexagonConstExtendersPass(PassRegistry&);
   void initializeHexagonConstPropagationPass(PassRegistry&);
   void initializeHexagonEarlyIfConversionPass(PassRegistry&);
   void initializeHexagonExpandCondsetsPass(PassRegistry&);
   void initializeHexagonGenMuxPass(PassRegistry&);
   void initializeHexagonHardwareLoopsPass(PassRegistry&);
   void initializeHexagonLoopIdiomRecognizePass(PassRegistry&);
   void initializeHexagonVectorLoopCarriedReusePass(PassRegistry&);
   void initializeHexagonNewValueJumpPass(PassRegistry&);
   void initializeHexagonOptAddrModePass(PassRegistry&);
   void initializeHexagonPacketizerPass(PassRegistry&);
   void initializeHexagonRDFOptPass(PassRegistry&);
   void initializeHexagonSplitDoubleRegsPass(PassRegistry&);
   void initializeHexagonVExtractPass(PassRegistry&);
   Pass *createHexagonLoopIdiomPass();
   Pass *createHexagonVectorLoopCarriedReusePass();

   FunctionPass *createHexagonBitSimplify();
   FunctionPass *createHexagonBranchRelaxation();
   FunctionPass *createHexagonCallFrameInformation();
   FunctionPass *createHexagonCFGOptimizer();
   FunctionPass *createHexagonCommonGEP();
   FunctionPass *createHexagonConstExtenders();
   FunctionPass *createHexagonConstPropagationPass();
   FunctionPass *createHexagonCopyToCombine();
   FunctionPass *createHexagonEarlyIfConversion();
   FunctionPass *createHexagonFixupHwLoops();
   FunctionPass *createHexagonGatherPacketize();
   FunctionPass *createHexagonGenExtract();
   FunctionPass *createHexagonGenInsert();
   FunctionPass *createHexagonGenMux();
   FunctionPass *createHexagonGenPredicate();
   FunctionPass *createHexagonHardwareLoops();
   FunctionPass *createHexagonISelDag(HexagonTargetMachine &TM,
                                      CodeGenOpt::Level OptLevel);
   FunctionPass *createHexagonLoopRescheduling();
   FunctionPass *createHexagonNewValueJump();
   FunctionPass *createHexagonOptimizeSZextends();
   FunctionPass *createHexagonOptAddrMode();
   FunctionPass *createHexagonPacketizer();
   FunctionPass *createHexagonPeephole();
   FunctionPass *createHexagonRDFOpt();
   FunctionPass *createHexagonSplitConst32AndConst64();
   FunctionPass *createHexagonSplitDoubleRegs();
   FunctionPass *createHexagonStoreWidening();
   FunctionPass *createHexagonVectorPrint();
   FunctionPass *createHexagonVExtract();
 } // end namespace llvm;

 static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
   if (!RM.hasValue())
     return Reloc::Static;
   return *RM;
 }

 static CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM) {
   if (CM)
     return *CM;
   return CodeModel::Small;
 }

 extern "C" void LLVMInitializeHexagonTarget() {
   // Register the target.
   RegisterTargetMachine<HexagonTargetMachine> X(getTheHexagonTarget());

   PassRegistry &PR = *PassRegistry::getPassRegistry();
   initializeHexagonBitSimplifyPass(PR);
   initializeHexagonConstExtendersPass(PR);
   initializeHexagonConstPropagationPass(PR);
   initializeHexagonEarlyIfConversionPass(PR);
   initializeHexagonGenMuxPass(PR);
   initializeHexagonHardwareLoopsPass(PR);
   initializeHexagonLoopIdiomRecognizePass(PR);
   initializeHexagonVectorLoopCarriedReusePass(PR);
   initializeHexagonNewValueJumpPass(PR);
   initializeHexagonOptAddrModePass(PR);
   initializeHexagonPacketizerPass(PR);
   initializeHexagonRDFOptPass(PR);
   initializeHexagonSplitDoubleRegsPass(PR);
   initializeHexagonVExtractPass(PR);
 }

 HexagonTargetMachine::HexagonTargetMachine(const Target &T, const Triple &TT,
                                            StringRef CPU, StringRef FS,
                                            const TargetOptions &Options,
                                            Optional<Reloc::Model> RM,
                                            Optional<CodeModel::Model> CM,
                                            CodeGenOpt::Level OL, bool JIT)
     // Specify the vector alignment explicitly. For v512x1, the calculated
     // alignment would be 512*alignment(i1), which is 512 bytes, instead of
     // the required minimum of 64 bytes.
     : LLVMTargetMachine(
           T,
           "e-m:e-p:32:32:32-a:0-n16:32-"
           "i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-"
           "v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048",
           TT, CPU, FS, Options, getEffectiveRelocModel(RM),
           getEffectiveCodeModel(CM), (HexagonNoOpt ? CodeGenOpt::None : OL)),
       TLOF(make_unique<HexagonTargetObjectFile>()) {
   initializeHexagonExpandCondsetsPass(*PassRegistry::getPassRegistry());
   initAsmInfo();
 }

 const HexagonSubtarget *
 HexagonTargetMachine::getSubtargetImpl(const Function &F) const {
   AttributeList FnAttrs = F.getAttributes();
   Attribute CPUAttr =
       FnAttrs.getAttribute(AttributeList::FunctionIndex, "target-cpu");
   Attribute FSAttr =
       FnAttrs.getAttribute(AttributeList::FunctionIndex, "target-features");

   std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
                         ? CPUAttr.getValueAsString().str()
                         : TargetCPU;
   std::string FS = !FSAttr.hasAttribute(Attribute::None)
                        ? FSAttr.getValueAsString().str()
                        : TargetFS;

   auto &I = SubtargetMap[CPU + FS];
   if (!I) {
     // This needs to be done before we create a new subtarget since any
     // creation will depend on the TM and the code generation flags on the
     // function that reside in TargetOptions.
     resetTargetOptions(F);
     I = llvm::make_unique<HexagonSubtarget>(TargetTriple, CPU, FS, *this);
   }
   return I.get();
 }

 void HexagonTargetMachine::adjustPassManager(PassManagerBuilder &PMB) {
   PMB.addExtension(
     PassManagerBuilder::EP_LateLoopOptimizations,
     [&](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
       PM.add(createHexagonLoopIdiomPass());
     });
   PMB.addExtension(
     PassManagerBuilder::EP_LoopOptimizerEnd,
     [&](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
       PM.add(createHexagonVectorLoopCarriedReusePass());
     });
 }

 TargetTransformInfo
 HexagonTargetMachine::getTargetTransformInfo(const Function &F) {
   return TargetTransformInfo(HexagonTTIImpl(this, F));
 }


 HexagonTargetMachine::~HexagonTargetMachine() {}

 namespace {
 /// Hexagon Code Generator Pass Configuration Options.
 class HexagonPassConfig : public TargetPassConfig {
 public:
   HexagonPassConfig(HexagonTargetMachine &TM, PassManagerBase &PM)
     : TargetPassConfig(TM, PM) {}

   HexagonTargetMachine &getHexagonTargetMachine() const {
     return getTM<HexagonTargetMachine>();
   }

   ScheduleDAGInstrs *
   createMachineScheduler(MachineSchedContext *C) const override {
     return createVLIWMachineSched(C);
   }

   void addIRPasses() override;
   bool addInstSelector() override;
   void addPreRegAlloc() override;
   void addPostRegAlloc() override;
   void addPreSched2() override;
   void addPreEmitPass() override;
 };
 } // namespace

 TargetPassConfig *HexagonTargetMachine::createPassConfig(PassManagerBase &PM) {
   return new HexagonPassConfig(*this, PM);
 }

 void HexagonPassConfig::addIRPasses() {
   TargetPassConfig::addIRPasses();
   bool NoOpt = (getOptLevel() == CodeGenOpt::None);

   if (!NoOpt) {
     addPass(createConstantPropagationPass());
     addPass(createDeadCodeEliminationPass());
   }

   addPass(createAtomicExpandPass());
   if (!NoOpt) {
     if (EnableLoopPrefetch)
       addPass(createLoopDataPrefetchPass());
     if (EnableCommGEP)
       addPass(createHexagonCommonGEP());
     // Replace certain combinations of shifts and ands with extracts.
     if (EnableGenExtract)
       addPass(createHexagonGenExtract());
   }
 }

 bool HexagonPassConfig::addInstSelector() {
   HexagonTargetMachine &TM = getHexagonTargetMachine();
   bool NoOpt = (getOptLevel() == CodeGenOpt::None);

   if (!NoOpt)
     addPass(createHexagonOptimizeSZextends());

   addPass(createHexagonISelDag(TM, getOptLevel()));

   if (!NoOpt) {
     if (EnableVExtractOpt)
       addPass(createHexagonVExtract());
     // Create logical operations on predicate registers.
     if (EnableGenPred)
       addPass(createHexagonGenPredicate());
     // Rotate loops to expose bit-simplification opportunities.
     if (EnableLoopResched)
       addPass(createHexagonLoopRescheduling());
     // Split double registers.
     if (!DisableHSDR)
       addPass(createHexagonSplitDoubleRegs());
     // Bit simplification.
     if (EnableBitSimplify)
       addPass(createHexagonBitSimplify());
     addPass(createHexagonPeephole());
     // Constant propagation.
     if (!DisableHCP) {
       addPass(createHexagonConstPropagationPass());
       addPass(&UnreachableMachineBlockElimID);
     }
     if (EnableGenInsert)
       addPass(createHexagonGenInsert());
     if (EnableEarlyIf)
       addPass(createHexagonEarlyIfConversion());
   }

   return false;
 }

 void HexagonPassConfig::addPreRegAlloc() {
   if (getOptLevel() != CodeGenOpt::None) {
     if (EnableCExtOpt)
       addPass(createHexagonConstExtenders());
     if (EnableExpandCondsets)
       insertPass(&RegisterCoalescerID, &HexagonExpandCondsetsID);
     if (!DisableStoreWidening)
       addPass(createHexagonStoreWidening());
     if (!DisableHardwareLoops)
       addPass(createHexagonHardwareLoops());
   }
   if (TM->getOptLevel() >= CodeGenOpt::Default)
     addPass(&MachinePipelinerID);
 }

 void HexagonPassConfig::addPostRegAlloc() {
   if (getOptLevel() != CodeGenOpt::None) {
     if (EnableRDFOpt)
       addPass(createHexagonRDFOpt());
     if (!DisableHexagonCFGOpt)
       addPass(createHexagonCFGOptimizer());
     if (!DisableAModeOpt)
       addPass(createHexagonOptAddrMode());
   }
 }

 void HexagonPassConfig::addPreSched2() {
   addPass(createHexagonCopyToCombine());
   if (getOptLevel() != CodeGenOpt::None)
     addPass(&IfConverterID);
   addPass(createHexagonSplitConst32AndConst64());
 }

 void HexagonPassConfig::addPreEmitPass() {
   bool NoOpt = (getOptLevel() == CodeGenOpt::None);

   if (!NoOpt)
     addPass(createHexagonNewValueJump());

   addPass(createHexagonBranchRelaxation());

   // Create Packets.
   if (!NoOpt) {
     if (!DisableHardwareLoops)
       addPass(createHexagonFixupHwLoops());
     // Generate MUX from pairs of conditional transfers.
     if (EnableGenMux)
       addPass(createHexagonGenMux());
   }

   // Create packets for 2 instructions that consitute a gather instruction.
   // Do this regardless of the opt level.
   addPass(createHexagonGatherPacketize(), false);

   if (!NoOpt)
     addPass(createHexagonPacketizer(), false);

   if (EnableVectorPrint)
     addPass(createHexagonVectorPrint(), false);

   // Add CFI instructions if necessary.
   addPass(createHexagonCallFrameInformation(), false);
 }
	//===-- HexagonTargetMachine.cpp - Define TargetMachine for Hexagon -------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// Implements the info about Hexagon target spec.
	//
	//===----------------------------------------------------------------------===//

	#include "HexagonTargetMachine.h"
	#include "Hexagon.h"
	#include "HexagonISelLowering.h"
	#include "HexagonMachineScheduler.h"
	#include "HexagonTargetObjectFile.h"
	#include "HexagonTargetTransformInfo.h"
	#include "llvm/CodeGen/Passes.h"
	#include "llvm/CodeGen/TargetPassConfig.h"
	#include "llvm/IR/LegacyPassManager.h"
	#include "llvm/IR/Module.h"
	#include "llvm/Support/CommandLine.h"
	#include "llvm/Support/TargetRegistry.h"
	#include "llvm/Transforms/IPO/PassManagerBuilder.h"
	#include "llvm/Transforms/Scalar.h"

	using namespace llvm;

	static cl::opt<bool> EnableCExtOpt("hexagon-cext", cl::Hidden, cl::ZeroOrMore,
	cl::init(true), cl::desc("Enable Hexagon constant-extender optimization"));

	static cl::opt<bool> EnableRDFOpt("rdf-opt", cl::Hidden, cl::ZeroOrMore,
	cl::init(true), cl::desc("Enable RDF-based optimizations"));

	static cl::opt<bool> DisableHardwareLoops("disable-hexagon-hwloops",
	cl::Hidden, cl::desc("Disable Hardware Loops for Hexagon target"));

	static cl::opt<bool> DisableAModeOpt("disable-hexagon-amodeopt",
	cl::Hidden, cl::ZeroOrMore, cl::init(false),
	cl::desc("Disable Hexagon Addressing Mode Optimization"));

	static cl::opt<bool> DisableHexagonCFGOpt("disable-hexagon-cfgopt",
	cl::Hidden, cl::ZeroOrMore, cl::init(false),
	cl::desc("Disable Hexagon CFG Optimization"));

	static cl::opt<bool> DisableHCP("disable-hcp", cl::init(false), cl::Hidden,
	cl::ZeroOrMore, cl::desc("Disable Hexagon constant propagation"));

	static cl::opt<bool> DisableStoreWidening("disable-store-widen",
	cl::Hidden, cl::init(false), cl::desc("Disable store widening"));

	static cl::opt<bool> EnableExpandCondsets("hexagon-expand-condsets",
	cl::init(true), cl::Hidden, cl::ZeroOrMore,
	cl::desc("Early expansion of MUX"));

	static cl::opt<bool> EnableEarlyIf("hexagon-eif", cl::init(true), cl::Hidden,
	cl::ZeroOrMore, cl::desc("Enable early if-conversion"));

	static cl::opt<bool> EnableGenInsert("hexagon-insert", cl::init(true),
	cl::Hidden, cl::desc("Generate \"insert\" instructions"));

	static cl::opt<bool> EnableCommGEP("hexagon-commgep", cl::init(true),
	cl::Hidden, cl::ZeroOrMore, cl::desc("Enable commoning of GEP instructions"));

	static cl::opt<bool> EnableGenExtract("hexagon-extract", cl::init(true),
	cl::Hidden, cl::desc("Generate \"extract\" instructions"));

	static cl::opt<bool> EnableGenMux("hexagon-mux", cl::init(true), cl::Hidden,
	cl::desc("Enable converting conditional transfers into MUX instructions"));

	static cl::opt<bool> EnableGenPred("hexagon-gen-pred", cl::init(true),
	cl::Hidden, cl::desc("Enable conversion of arithmetic operations to "
	"predicate instructions"));

	static cl::opt<bool> EnableLoopPrefetch("hexagon-loop-prefetch",
	cl::init(false), cl::Hidden, cl::ZeroOrMore,
	cl::desc("Enable loop data prefetch on Hexagon"));

	static cl::opt<bool> DisableHSDR("disable-hsdr", cl::init(false), cl::Hidden,
	cl::desc("Disable splitting double registers"));

	static cl::opt<bool> EnableBitSimplify("hexagon-bit", cl::init(true),
	cl::Hidden, cl::desc("Bit simplification"));

	static cl::opt<bool> EnableLoopResched("hexagon-loop-resched", cl::init(true),
	cl::Hidden, cl::desc("Loop rescheduling"));

	static cl::opt<bool> HexagonNoOpt("hexagon-noopt", cl::init(false),
	cl::Hidden, cl::desc("Disable backend optimizations"));

	static cl::opt<bool> EnableVectorPrint("enable-hexagon-vector-print",
	cl::Hidden, cl::ZeroOrMore, cl::init(false),
	cl::desc("Enable Hexagon Vector print instr pass"));

	static cl::opt<bool> EnableVExtractOpt("hexagon-opt-vextract", cl::Hidden,
	cl::ZeroOrMore, cl::init(true), cl::desc("Enable vextract optimization"));

	/// HexagonTargetMachineModule - Note that this is used on hosts that
	/// cannot link in a library unless there are references into the
	/// library. In particular, it seems that it is not possible to get
	/// things to work on Win32 without this. Though it is unused, do not
	/// remove it.
	extern "C" int HexagonTargetMachineModule;
	int HexagonTargetMachineModule = 0;

	static ScheduleDAGInstrs createVLIWMachineSched(MachineSchedContext C) {
	ScheduleDAGMILive *DAG =
	new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
	DAG->addMutation(make_unique<HexagonSubtarget::UsrOverflowMutation>());
	DAG->addMutation(make_unique<HexagonSubtarget::HVXMemLatencyMutation>());
	DAG->addMutation(make_unique<HexagonSubtarget::CallMutation>());
	DAG->addMutation(createCopyConstrainDAGMutation(DAG->TII, DAG->TRI));
	return DAG;
	}

	static MachineSchedRegistry
	SchedCustomRegistry("hexagon", "Run Hexagon's custom scheduler",
	createVLIWMachineSched);

	namespace llvm {
	extern char &HexagonExpandCondsetsID;
	void initializeHexagonBitSimplifyPass(PassRegistry&);
	void initializeHexagonConstExtendersPass(PassRegistry&);
	void initializeHexagonConstPropagationPass(PassRegistry&);
	void initializeHexagonEarlyIfConversionPass(PassRegistry&);
	void initializeHexagonExpandCondsetsPass(PassRegistry&);
	void initializeHexagonGenMuxPass(PassRegistry&);
	void initializeHexagonHardwareLoopsPass(PassRegistry&);
	void initializeHexagonLoopIdiomRecognizePass(PassRegistry&);
	void initializeHexagonVectorLoopCarriedReusePass(PassRegistry&);
	void initializeHexagonNewValueJumpPass(PassRegistry&);
	void initializeHexagonOptAddrModePass(PassRegistry&);
	void initializeHexagonPacketizerPass(PassRegistry&);
	void initializeHexagonRDFOptPass(PassRegistry&);
	void initializeHexagonSplitDoubleRegsPass(PassRegistry&);
	void initializeHexagonVExtractPass(PassRegistry&);
	Pass *createHexagonLoopIdiomPass();
	Pass *createHexagonVectorLoopCarriedReusePass();

	FunctionPass *createHexagonBitSimplify();
	FunctionPass *createHexagonBranchRelaxation();
	FunctionPass *createHexagonCallFrameInformation();
	FunctionPass *createHexagonCFGOptimizer();
	FunctionPass *createHexagonCommonGEP();
	FunctionPass *createHexagonConstExtenders();
	FunctionPass *createHexagonConstPropagationPass();
	FunctionPass *createHexagonCopyToCombine();
	FunctionPass *createHexagonEarlyIfConversion();
	FunctionPass *createHexagonFixupHwLoops();
	FunctionPass *createHexagonGatherPacketize();
	FunctionPass *createHexagonGenExtract();
	FunctionPass *createHexagonGenInsert();
	FunctionPass *createHexagonGenMux();
	FunctionPass *createHexagonGenPredicate();
	FunctionPass *createHexagonHardwareLoops();
	FunctionPass *createHexagonISelDag(HexagonTargetMachine &TM,
	CodeGenOpt::Level OptLevel);
	FunctionPass *createHexagonLoopRescheduling();
	FunctionPass *createHexagonNewValueJump();
	FunctionPass *createHexagonOptimizeSZextends();
	FunctionPass *createHexagonOptAddrMode();
	FunctionPass *createHexagonPacketizer();
	FunctionPass *createHexagonPeephole();
	FunctionPass *createHexagonRDFOpt();
	FunctionPass *createHexagonSplitConst32AndConst64();
	FunctionPass *createHexagonSplitDoubleRegs();
	FunctionPass *createHexagonStoreWidening();
	FunctionPass *createHexagonVectorPrint();
	FunctionPass *createHexagonVExtract();
	} // end namespace llvm;

	static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
	if (!RM.hasValue())
	return Reloc::Static;
	return *RM;
	}

	static CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM) {
	if (CM)
	return *CM;
	return CodeModel::Small;
	}

	extern "C" void LLVMInitializeHexagonTarget() {
	// Register the target.
	RegisterTargetMachine<HexagonTargetMachine> X(getTheHexagonTarget());

	PassRegistry &PR = *PassRegistry::getPassRegistry();
	initializeHexagonBitSimplifyPass(PR);
	initializeHexagonConstExtendersPass(PR);
	initializeHexagonConstPropagationPass(PR);
	initializeHexagonEarlyIfConversionPass(PR);
	initializeHexagonGenMuxPass(PR);
	initializeHexagonHardwareLoopsPass(PR);
	initializeHexagonLoopIdiomRecognizePass(PR);
	initializeHexagonVectorLoopCarriedReusePass(PR);
	initializeHexagonNewValueJumpPass(PR);
	initializeHexagonOptAddrModePass(PR);
	initializeHexagonPacketizerPass(PR);
	initializeHexagonRDFOptPass(PR);
	initializeHexagonSplitDoubleRegsPass(PR);
	initializeHexagonVExtractPass(PR);
	}

	HexagonTargetMachine::HexagonTargetMachine(const Target &T, const Triple &TT,
	StringRef CPU, StringRef FS,
	const TargetOptions &Options,
	Optional<Reloc::Model> RM,
	Optional<CodeModel::Model> CM,
	CodeGenOpt::Level OL, bool JIT)
	// Specify the vector alignment explicitly. For v512x1, the calculated
	// alignment would be 512*alignment(i1), which is 512 bytes, instead of
	// the required minimum of 64 bytes.
	: LLVMTargetMachine(
	T,
	"e-m:e-p:32:32:32-a:0-n16:32-"
	"i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-"
	"v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048",
	TT, CPU, FS, Options, getEffectiveRelocModel(RM),
	getEffectiveCodeModel(CM), (HexagonNoOpt ? CodeGenOpt::None : OL)),
	TLOF(make_unique<HexagonTargetObjectFile>()) {
	initializeHexagonExpandCondsetsPass(*PassRegistry::getPassRegistry());
	initAsmInfo();
	}

	const HexagonSubtarget *
	HexagonTargetMachine::getSubtargetImpl(const Function &F) const {
	AttributeList FnAttrs = F.getAttributes();
	Attribute CPUAttr =
	FnAttrs.getAttribute(AttributeList::FunctionIndex, "target-cpu");
	Attribute FSAttr =
	FnAttrs.getAttribute(AttributeList::FunctionIndex, "target-features");

	std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
	? CPUAttr.getValueAsString().str()
	: TargetCPU;
	std::string FS = !FSAttr.hasAttribute(Attribute::None)
	? FSAttr.getValueAsString().str()
	: TargetFS;

	auto &I = SubtargetMap[CPU + FS];
	if (!I) {
	// This needs to be done before we create a new subtarget since any
	// creation will depend on the TM and the code generation flags on the
	// function that reside in TargetOptions.
	resetTargetOptions(F);
	I = llvm::make_unique<HexagonSubtarget>(TargetTriple, CPU, FS, *this);
	}
	return I.get();
	}

	void HexagonTargetMachine::adjustPassManager(PassManagerBuilder &PMB) {
	PMB.addExtension(
	PassManagerBuilder::EP_LateLoopOptimizations,
	[&](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
	PM.add(createHexagonLoopIdiomPass());
	});
	PMB.addExtension(
	PassManagerBuilder::EP_LoopOptimizerEnd,
	[&](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
	PM.add(createHexagonVectorLoopCarriedReusePass());
	});
	}

	TargetTransformInfo
	HexagonTargetMachine::getTargetTransformInfo(const Function &F) {
	return TargetTransformInfo(HexagonTTIImpl(this, F));
	}


	HexagonTargetMachine::~HexagonTargetMachine() {}

	namespace {
	/// Hexagon Code Generator Pass Configuration Options.
	class HexagonPassConfig : public TargetPassConfig {
	public:
	HexagonPassConfig(HexagonTargetMachine &TM, PassManagerBase &PM)
	: TargetPassConfig(TM, PM) {}

	HexagonTargetMachine &getHexagonTargetMachine() const {
	return getTM<HexagonTargetMachine>();
	}

	ScheduleDAGInstrs *
	createMachineScheduler(MachineSchedContext *C) const override {
	return createVLIWMachineSched(C);
	}

	void addIRPasses() override;
	bool addInstSelector() override;
	void addPreRegAlloc() override;
	void addPostRegAlloc() override;
	void addPreSched2() override;
	void addPreEmitPass() override;
	};
	} // namespace

	TargetPassConfig *HexagonTargetMachine::createPassConfig(PassManagerBase &PM) {
	return new HexagonPassConfig(*this, PM);
	}

	void HexagonPassConfig::addIRPasses() {
	TargetPassConfig::addIRPasses();
	bool NoOpt = (getOptLevel() == CodeGenOpt::None);

	if (!NoOpt) {
	addPass(createConstantPropagationPass());
	addPass(createDeadCodeEliminationPass());
	}

	addPass(createAtomicExpandPass());
	if (!NoOpt) {
	if (EnableLoopPrefetch)
	addPass(createLoopDataPrefetchPass());
	if (EnableCommGEP)
	addPass(createHexagonCommonGEP());
	// Replace certain combinations of shifts and ands with extracts.
	if (EnableGenExtract)
	addPass(createHexagonGenExtract());
	}
	}

	bool HexagonPassConfig::addInstSelector() {
	HexagonTargetMachine &TM = getHexagonTargetMachine();
	bool NoOpt = (getOptLevel() == CodeGenOpt::None);

	if (!NoOpt)
	addPass(createHexagonOptimizeSZextends());

	addPass(createHexagonISelDag(TM, getOptLevel()));

	if (!NoOpt) {
	if (EnableVExtractOpt)
	addPass(createHexagonVExtract());
	// Create logical operations on predicate registers.
	if (EnableGenPred)
	addPass(createHexagonGenPredicate());
	// Rotate loops to expose bit-simplification opportunities.
	if (EnableLoopResched)
	addPass(createHexagonLoopRescheduling());
	// Split double registers.
	if (!DisableHSDR)
	addPass(createHexagonSplitDoubleRegs());
	// Bit simplification.
	if (EnableBitSimplify)
	addPass(createHexagonBitSimplify());
	addPass(createHexagonPeephole());
	// Constant propagation.
	if (!DisableHCP) {
	addPass(createHexagonConstPropagationPass());
	addPass(&UnreachableMachineBlockElimID);
	}
	if (EnableGenInsert)
	addPass(createHexagonGenInsert());
	if (EnableEarlyIf)
	addPass(createHexagonEarlyIfConversion());
	}

	return false;
	}

	void HexagonPassConfig::addPreRegAlloc() {
	if (getOptLevel() != CodeGenOpt::None) {
	if (EnableCExtOpt)
	addPass(createHexagonConstExtenders());
	if (EnableExpandCondsets)
	insertPass(&RegisterCoalescerID, &HexagonExpandCondsetsID);
	if (!DisableStoreWidening)
	addPass(createHexagonStoreWidening());
	if (!DisableHardwareLoops)
	addPass(createHexagonHardwareLoops());
	}
	if (TM->getOptLevel() >= CodeGenOpt::Default)
	addPass(&MachinePipelinerID);
	}

	void HexagonPassConfig::addPostRegAlloc() {
	if (getOptLevel() != CodeGenOpt::None) {
	if (EnableRDFOpt)
	addPass(createHexagonRDFOpt());
	if (!DisableHexagonCFGOpt)
	addPass(createHexagonCFGOptimizer());
	if (!DisableAModeOpt)
	addPass(createHexagonOptAddrMode());
	}
	}

	void HexagonPassConfig::addPreSched2() {
	addPass(createHexagonCopyToCombine());
	if (getOptLevel() != CodeGenOpt::None)
	addPass(&IfConverterID);
	addPass(createHexagonSplitConst32AndConst64());
	}

	void HexagonPassConfig::addPreEmitPass() {
	bool NoOpt = (getOptLevel() == CodeGenOpt::None);

	if (!NoOpt)
	addPass(createHexagonNewValueJump());

	addPass(createHexagonBranchRelaxation());

	// Create Packets.
	if (!NoOpt) {
	if (!DisableHardwareLoops)
	addPass(createHexagonFixupHwLoops());
	// Generate MUX from pairs of conditional transfers.
	if (EnableGenMux)
	addPass(createHexagonGenMux());
	}

	// Create packets for 2 instructions that consitute a gather instruction.
	// Do this regardless of the opt level.
	addPass(createHexagonGatherPacketize(), false);

	if (!NoOpt)
	addPass(createHexagonPacketizer(), false);

	if (EnableVectorPrint)
	addPass(createHexagonVectorPrint(), false);

	// Add CFI instructions if necessary.
	addPass(createHexagonCallFrameInformation(), false);
	}