1 //===-- HexagonTargetMachine.cpp - Define TargetMachine for Hexagon -------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implements the info about Hexagon target spec.
12 //===----------------------------------------------------------------------===//
14 #include "HexagonTargetMachine.h"
16 #include "HexagonISelLowering.h"
17 #include "HexagonMachineScheduler.h"
18 #include "HexagonTargetObjectFile.h"
19 #include "HexagonTargetTransformInfo.h"
20 #include "llvm/CodeGen/Passes.h"
21 #include "llvm/IR/LegacyPassManager.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/TargetRegistry.h"
25 #include "llvm/Transforms/Scalar.h"
29 static cl:: opt<bool> DisableHardwareLoops("disable-hexagon-hwloops",
30 cl::Hidden, cl::desc("Disable Hardware Loops for Hexagon target"));
32 static cl::opt<bool> DisableHexagonCFGOpt("disable-hexagon-cfgopt",
33 cl::Hidden, cl::ZeroOrMore, cl::init(false),
34 cl::desc("Disable Hexagon CFG Optimization"));
36 static cl::opt<bool> DisableStoreWidening("disable-store-widen",
37 cl::Hidden, cl::init(false), cl::desc("Disable store widening"));
39 static cl::opt<bool> EnableExpandCondsets("hexagon-expand-condsets",
40 cl::init(true), cl::Hidden, cl::ZeroOrMore,
41 cl::desc("Early expansion of MUX"));
43 static cl::opt<bool> EnableEarlyIf("hexagon-eif", cl::init(true), cl::Hidden,
44 cl::ZeroOrMore, cl::desc("Enable early if-conversion"));
46 static cl::opt<bool> EnableGenInsert("hexagon-insert", cl::init(true),
47 cl::Hidden, cl::desc("Generate \"insert\" instructions"));
49 static cl::opt<bool> EnableCommGEP("hexagon-commgep", cl::init(true),
50 cl::Hidden, cl::ZeroOrMore, cl::desc("Enable commoning of GEP instructions"));
52 static cl::opt<bool> EnableGenExtract("hexagon-extract", cl::init(true),
53 cl::Hidden, cl::desc("Generate \"extract\" instructions"));
55 static cl::opt<bool> EnableGenMux("hexagon-mux", cl::init(true), cl::Hidden,
56 cl::desc("Enable converting conditional transfers into MUX instructions"));
58 static cl::opt<bool> EnableGenPred("hexagon-gen-pred", cl::init(true),
59 cl::Hidden, cl::desc("Enable conversion of arithmetic operations to "
60 "predicate instructions"));
62 /// HexagonTargetMachineModule - Note that this is used on hosts that
63 /// cannot link in a library unless there are references into the
64 /// library. In particular, it seems that it is not possible to get
65 /// things to work on Win32 without this. Though it is unused, do not
67 extern "C" int HexagonTargetMachineModule;
68 int HexagonTargetMachineModule = 0;
70 extern "C" void LLVMInitializeHexagonTarget() {
71 // Register the target.
72 RegisterTargetMachine<HexagonTargetMachine> X(TheHexagonTarget);
75 static ScheduleDAGInstrs *createVLIWMachineSched(MachineSchedContext *C) {
76 return new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
79 static MachineSchedRegistry
80 SchedCustomRegistry("hexagon", "Run Hexagon's custom scheduler",
81 createVLIWMachineSched);
84 FunctionPass *createHexagonCFGOptimizer();
85 FunctionPass *createHexagonCommonGEP();
86 FunctionPass *createHexagonCopyToCombine();
87 FunctionPass *createHexagonEarlyIfConversion();
88 FunctionPass *createHexagonExpandCondsets();
89 FunctionPass *createHexagonExpandPredSpillCode();
90 FunctionPass *createHexagonFixupHwLoops();
91 FunctionPass *createHexagonGenExtract();
92 FunctionPass *createHexagonGenInsert();
93 FunctionPass *createHexagonGenMux();
94 FunctionPass *createHexagonGenPredicate();
95 FunctionPass *createHexagonHardwareLoops();
96 FunctionPass *createHexagonISelDag(HexagonTargetMachine &TM,
97 CodeGenOpt::Level OptLevel);
98 FunctionPass *createHexagonNewValueJump();
99 FunctionPass *createHexagonPacketizer();
100 FunctionPass *createHexagonPeephole();
101 FunctionPass *createHexagonSplitConst32AndConst64();
102 FunctionPass *createHexagonStoreWidening();
103 } // end namespace llvm;
105 /// HexagonTargetMachine ctor - Create an ILP32 architecture model.
108 /// Hexagon_TODO: Do I need an aggregate alignment?
110 HexagonTargetMachine::HexagonTargetMachine(const Target &T, const Triple &TT,
111 StringRef CPU, StringRef FS,
112 const TargetOptions &Options,
113 Reloc::Model RM, CodeModel::Model CM,
114 CodeGenOpt::Level OL)
115 : LLVMTargetMachine(T, "e-m:e-p:32:32-i1:32-i64:64-a:0-n32", TT, CPU, FS,
116 Options, RM, CM, OL),
117 TLOF(make_unique<HexagonTargetObjectFile>()) {
121 const HexagonSubtarget *
122 HexagonTargetMachine::getSubtargetImpl(const Function &F) const {
123 AttributeSet FnAttrs = F.getAttributes();
125 FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-cpu");
127 FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-features");
129 std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
130 ? CPUAttr.getValueAsString().str()
132 std::string FS = !FSAttr.hasAttribute(Attribute::None)
133 ? FSAttr.getValueAsString().str()
136 auto &I = SubtargetMap[CPU + FS];
138 // This needs to be done before we create a new subtarget since any
139 // creation will depend on the TM and the code generation flags on the
140 // function that reside in TargetOptions.
141 resetTargetOptions(F);
142 I = llvm::make_unique<HexagonSubtarget>(TargetTriple, CPU, FS, *this);
147 TargetIRAnalysis HexagonTargetMachine::getTargetIRAnalysis() {
148 return TargetIRAnalysis([this](const Function &F) {
149 return TargetTransformInfo(HexagonTTIImpl(this, F));
154 HexagonTargetMachine::~HexagonTargetMachine() {}
157 /// Hexagon Code Generator Pass Configuration Options.
158 class HexagonPassConfig : public TargetPassConfig {
160 HexagonPassConfig(HexagonTargetMachine *TM, PassManagerBase &PM)
161 : TargetPassConfig(TM, PM) {
162 bool NoOpt = (TM->getOptLevel() == CodeGenOpt::None);
164 if (EnableExpandCondsets) {
165 Pass *Exp = createHexagonExpandCondsets();
166 insertPass(&RegisterCoalescerID, IdentifyingPassPtr(Exp));
171 HexagonTargetMachine &getHexagonTargetMachine() const {
172 return getTM<HexagonTargetMachine>();
176 createMachineScheduler(MachineSchedContext *C) const override {
177 return createVLIWMachineSched(C);
180 void addIRPasses() override;
181 bool addInstSelector() override;
182 void addPreRegAlloc() override;
183 void addPostRegAlloc() override;
184 void addPreSched2() override;
185 void addPreEmitPass() override;
189 TargetPassConfig *HexagonTargetMachine::createPassConfig(PassManagerBase &PM) {
190 return new HexagonPassConfig(this, PM);
193 void HexagonPassConfig::addIRPasses() {
194 TargetPassConfig::addIRPasses();
195 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
197 addPass(createAtomicExpandPass(TM));
200 addPass(createHexagonCommonGEP());
201 // Replace certain combinations of shifts and ands with extracts.
202 if (EnableGenExtract)
203 addPass(createHexagonGenExtract());
207 bool HexagonPassConfig::addInstSelector() {
208 HexagonTargetMachine &TM = getHexagonTargetMachine();
209 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
211 addPass(createHexagonISelDag(TM, getOptLevel()));
214 // Create logical operations on predicate registers.
216 addPass(createHexagonGenPredicate(), false);
217 addPass(createHexagonPeephole());
218 printAndVerify("After hexagon peephole pass");
220 addPass(createHexagonGenInsert(), false);
222 addPass(createHexagonEarlyIfConversion(), false);
228 void HexagonPassConfig::addPreRegAlloc() {
229 if (getOptLevel() != CodeGenOpt::None) {
230 if (!DisableStoreWidening)
231 addPass(createHexagonStoreWidening(), false);
232 if (!DisableHardwareLoops)
233 addPass(createHexagonHardwareLoops(), false);
237 void HexagonPassConfig::addPostRegAlloc() {
238 if (getOptLevel() != CodeGenOpt::None)
239 if (!DisableHexagonCFGOpt)
240 addPass(createHexagonCFGOptimizer(), false);
243 void HexagonPassConfig::addPreSched2() {
244 addPass(createHexagonCopyToCombine(), false);
245 if (getOptLevel() != CodeGenOpt::None)
246 addPass(&IfConverterID, false);
247 addPass(createHexagonSplitConst32AndConst64());
250 void HexagonPassConfig::addPreEmitPass() {
251 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
254 addPass(createHexagonNewValueJump(), false);
256 // Expand Spill code for predicate registers.
257 addPass(createHexagonExpandPredSpillCode(), false);
261 if (!DisableHardwareLoops)
262 addPass(createHexagonFixupHwLoops(), false);
263 // Generate MUX from pairs of conditional transfers.
265 addPass(createHexagonGenMux(), false);
267 addPass(createHexagonPacketizer(), false);