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 static cl::opt<bool> DisableHSDR("disable-hsdr", cl::init(false), cl::Hidden,
63 cl::desc("Disable splitting double registers"));
65 /// HexagonTargetMachineModule - Note that this is used on hosts that
66 /// cannot link in a library unless there are references into the
67 /// library. In particular, it seems that it is not possible to get
68 /// things to work on Win32 without this. Though it is unused, do not
70 extern "C" int HexagonTargetMachineModule;
71 int HexagonTargetMachineModule = 0;
73 extern "C" void LLVMInitializeHexagonTarget() {
74 // Register the target.
75 RegisterTargetMachine<HexagonTargetMachine> X(TheHexagonTarget);
78 static ScheduleDAGInstrs *createVLIWMachineSched(MachineSchedContext *C) {
79 return new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
82 static MachineSchedRegistry
83 SchedCustomRegistry("hexagon", "Run Hexagon's custom scheduler",
84 createVLIWMachineSched);
87 FunctionPass *createHexagonCallFrameInformation();
88 FunctionPass *createHexagonCFGOptimizer();
89 FunctionPass *createHexagonCommonGEP();
90 FunctionPass *createHexagonCopyToCombine();
91 FunctionPass *createHexagonEarlyIfConversion();
92 FunctionPass *createHexagonExpandCondsets();
93 FunctionPass *createHexagonExpandPredSpillCode();
94 FunctionPass *createHexagonFixupHwLoops();
95 FunctionPass *createHexagonGenExtract();
96 FunctionPass *createHexagonGenInsert();
97 FunctionPass *createHexagonGenMux();
98 FunctionPass *createHexagonGenPredicate();
99 FunctionPass *createHexagonHardwareLoops();
100 FunctionPass *createHexagonISelDag(HexagonTargetMachine &TM,
101 CodeGenOpt::Level OptLevel);
102 FunctionPass *createHexagonNewValueJump();
103 FunctionPass *createHexagonOptimizeSZextends();
104 FunctionPass *createHexagonPacketizer();
105 FunctionPass *createHexagonPeephole();
106 FunctionPass *createHexagonSplitConst32AndConst64();
107 FunctionPass *createHexagonSplitDoubleRegs();
108 FunctionPass *createHexagonStoreWidening();
109 } // end namespace llvm;
111 /// HexagonTargetMachine ctor - Create an ILP32 architecture model.
114 /// Hexagon_TODO: Do I need an aggregate alignment?
116 HexagonTargetMachine::HexagonTargetMachine(const Target &T, const Triple &TT,
117 StringRef CPU, StringRef FS,
118 const TargetOptions &Options,
119 Reloc::Model RM, CodeModel::Model CM,
120 CodeGenOpt::Level OL)
121 : LLVMTargetMachine(T, "e-m:e-p:32:32-i1:32-i64:64-a:0-n32", TT, CPU, FS,
122 Options, RM, CM, OL),
123 TLOF(make_unique<HexagonTargetObjectFile>()) {
127 const HexagonSubtarget *
128 HexagonTargetMachine::getSubtargetImpl(const Function &F) const {
129 AttributeSet FnAttrs = F.getAttributes();
131 FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-cpu");
133 FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-features");
135 std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
136 ? CPUAttr.getValueAsString().str()
138 std::string FS = !FSAttr.hasAttribute(Attribute::None)
139 ? FSAttr.getValueAsString().str()
142 auto &I = SubtargetMap[CPU + FS];
144 // This needs to be done before we create a new subtarget since any
145 // creation will depend on the TM and the code generation flags on the
146 // function that reside in TargetOptions.
147 resetTargetOptions(F);
148 I = llvm::make_unique<HexagonSubtarget>(TargetTriple, CPU, FS, *this);
153 TargetIRAnalysis HexagonTargetMachine::getTargetIRAnalysis() {
154 return TargetIRAnalysis([this](const Function &F) {
155 return TargetTransformInfo(HexagonTTIImpl(this, F));
160 HexagonTargetMachine::~HexagonTargetMachine() {}
163 /// Hexagon Code Generator Pass Configuration Options.
164 class HexagonPassConfig : public TargetPassConfig {
166 HexagonPassConfig(HexagonTargetMachine *TM, PassManagerBase &PM)
167 : TargetPassConfig(TM, PM) {
168 bool NoOpt = (TM->getOptLevel() == CodeGenOpt::None);
170 if (EnableExpandCondsets) {
171 Pass *Exp = createHexagonExpandCondsets();
172 insertPass(&RegisterCoalescerID, IdentifyingPassPtr(Exp));
177 HexagonTargetMachine &getHexagonTargetMachine() const {
178 return getTM<HexagonTargetMachine>();
182 createMachineScheduler(MachineSchedContext *C) const override {
183 return createVLIWMachineSched(C);
186 void addIRPasses() override;
187 bool addInstSelector() override;
188 void addPreRegAlloc() override;
189 void addPostRegAlloc() override;
190 void addPreSched2() override;
191 void addPreEmitPass() override;
195 TargetPassConfig *HexagonTargetMachine::createPassConfig(PassManagerBase &PM) {
196 return new HexagonPassConfig(this, PM);
199 void HexagonPassConfig::addIRPasses() {
200 TargetPassConfig::addIRPasses();
201 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
203 addPass(createAtomicExpandPass(TM));
206 addPass(createHexagonCommonGEP());
207 // Replace certain combinations of shifts and ands with extracts.
208 if (EnableGenExtract)
209 addPass(createHexagonGenExtract());
213 bool HexagonPassConfig::addInstSelector() {
214 HexagonTargetMachine &TM = getHexagonTargetMachine();
215 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
218 addPass(createHexagonOptimizeSZextends());
220 addPass(createHexagonISelDag(TM, getOptLevel()));
223 // Create logical operations on predicate registers.
225 addPass(createHexagonGenPredicate(), false);
226 // Split double registers.
228 addPass(createHexagonSplitDoubleRegs());
229 addPass(createHexagonPeephole());
230 printAndVerify("After hexagon peephole pass");
232 addPass(createHexagonGenInsert(), false);
234 addPass(createHexagonEarlyIfConversion(), false);
240 void HexagonPassConfig::addPreRegAlloc() {
241 if (getOptLevel() != CodeGenOpt::None) {
242 if (!DisableStoreWidening)
243 addPass(createHexagonStoreWidening(), false);
244 if (!DisableHardwareLoops)
245 addPass(createHexagonHardwareLoops(), false);
249 void HexagonPassConfig::addPostRegAlloc() {
250 if (getOptLevel() != CodeGenOpt::None)
251 if (!DisableHexagonCFGOpt)
252 addPass(createHexagonCFGOptimizer(), false);
255 void HexagonPassConfig::addPreSched2() {
256 addPass(createHexagonCopyToCombine(), false);
257 if (getOptLevel() != CodeGenOpt::None)
258 addPass(&IfConverterID, false);
259 addPass(createHexagonSplitConst32AndConst64());
262 void HexagonPassConfig::addPreEmitPass() {
263 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
266 addPass(createHexagonNewValueJump(), false);
268 // Expand Spill code for predicate registers.
269 addPass(createHexagonExpandPredSpillCode(), false);
273 if (!DisableHardwareLoops)
274 addPass(createHexagonFixupHwLoops(), false);
275 // Generate MUX from pairs of conditional transfers.
277 addPass(createHexagonGenMux(), false);
279 addPass(createHexagonPacketizer(), false);
282 // Add CFI instructions if necessary.
283 addPass(createHexagonCallFrameInformation(), false);