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/CodeGen/TargetPassConfig.h"
22 #include "llvm/IR/LegacyPassManager.h"
23 #include "llvm/IR/Module.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/Support/TargetRegistry.h"
26 #include "llvm/Transforms/Scalar.h"
27 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
31 static cl::opt<bool> EnableRDFOpt("rdf-opt", cl::Hidden, cl::ZeroOrMore,
32 cl::init(true), cl::desc("Enable RDF-based optimizations"));
34 static cl::opt<bool> DisableHardwareLoops("disable-hexagon-hwloops",
35 cl::Hidden, cl::desc("Disable Hardware Loops for Hexagon target"));
37 static cl::opt<bool> DisableAModeOpt("disable-hexagon-amodeopt",
38 cl::Hidden, cl::ZeroOrMore, cl::init(false),
39 cl::desc("Disable Hexagon Addressing Mode Optimization"));
41 static cl::opt<bool> DisableHexagonCFGOpt("disable-hexagon-cfgopt",
42 cl::Hidden, cl::ZeroOrMore, cl::init(false),
43 cl::desc("Disable Hexagon CFG Optimization"));
45 static cl::opt<bool> DisableHCP("disable-hcp", cl::init(false), cl::Hidden,
46 cl::ZeroOrMore, cl::desc("Disable Hexagon constant propagation"));
48 static cl::opt<bool> DisableStoreWidening("disable-store-widen",
49 cl::Hidden, cl::init(false), cl::desc("Disable store widening"));
51 static cl::opt<bool> EnableExpandCondsets("hexagon-expand-condsets",
52 cl::init(true), cl::Hidden, cl::ZeroOrMore,
53 cl::desc("Early expansion of MUX"));
55 static cl::opt<bool> EnableEarlyIf("hexagon-eif", cl::init(true), cl::Hidden,
56 cl::ZeroOrMore, cl::desc("Enable early if-conversion"));
58 static cl::opt<bool> EnableGenInsert("hexagon-insert", cl::init(true),
59 cl::Hidden, cl::desc("Generate \"insert\" instructions"));
61 static cl::opt<bool> EnableCommGEP("hexagon-commgep", cl::init(true),
62 cl::Hidden, cl::ZeroOrMore, cl::desc("Enable commoning of GEP instructions"));
64 static cl::opt<bool> EnableGenExtract("hexagon-extract", cl::init(true),
65 cl::Hidden, cl::desc("Generate \"extract\" instructions"));
67 static cl::opt<bool> EnableGenMux("hexagon-mux", cl::init(true), cl::Hidden,
68 cl::desc("Enable converting conditional transfers into MUX instructions"));
70 static cl::opt<bool> EnableGenPred("hexagon-gen-pred", cl::init(true),
71 cl::Hidden, cl::desc("Enable conversion of arithmetic operations to "
72 "predicate instructions"));
74 static cl::opt<bool> EnableLoopPrefetch("hexagon-loop-prefetch",
75 cl::init(false), cl::Hidden, cl::ZeroOrMore,
76 cl::desc("Enable loop data prefetch on Hexagon"));
78 static cl::opt<bool> DisableHSDR("disable-hsdr", cl::init(false), cl::Hidden,
79 cl::desc("Disable splitting double registers"));
81 static cl::opt<bool> EnableBitSimplify("hexagon-bit", cl::init(true),
82 cl::Hidden, cl::desc("Bit simplification"));
84 static cl::opt<bool> EnableLoopResched("hexagon-loop-resched", cl::init(true),
85 cl::Hidden, cl::desc("Loop rescheduling"));
87 static cl::opt<bool> HexagonNoOpt("hexagon-noopt", cl::init(false),
88 cl::Hidden, cl::desc("Disable backend optimizations"));
90 static cl::opt<bool> EnableVectorPrint("enable-hexagon-vector-print",
91 cl::Hidden, cl::ZeroOrMore, cl::init(false),
92 cl::desc("Enable Hexagon Vector print instr pass"));
94 /// HexagonTargetMachineModule - Note that this is used on hosts that
95 /// cannot link in a library unless there are references into the
96 /// library. In particular, it seems that it is not possible to get
97 /// things to work on Win32 without this. Though it is unused, do not
99 extern "C" int HexagonTargetMachineModule;
100 int HexagonTargetMachineModule = 0;
102 static ScheduleDAGInstrs *createVLIWMachineSched(MachineSchedContext *C) {
103 return new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
106 static MachineSchedRegistry
107 SchedCustomRegistry("hexagon", "Run Hexagon's custom scheduler",
108 createVLIWMachineSched);
111 extern char &HexagonExpandCondsetsID;
112 void initializeHexagonExpandCondsetsPass(PassRegistry&);
113 void initializeHexagonLoopIdiomRecognizePass(PassRegistry&);
114 void initializeHexagonOptAddrModePass(PassRegistry&);
115 Pass *createHexagonLoopIdiomPass();
117 FunctionPass *createHexagonBitSimplify();
118 FunctionPass *createHexagonBranchRelaxation();
119 FunctionPass *createHexagonCallFrameInformation();
120 FunctionPass *createHexagonCFGOptimizer();
121 FunctionPass *createHexagonCommonGEP();
122 FunctionPass *createHexagonConstPropagationPass();
123 FunctionPass *createHexagonCopyToCombine();
124 FunctionPass *createHexagonEarlyIfConversion();
125 FunctionPass *createHexagonFixupHwLoops();
126 FunctionPass *createHexagonGenExtract();
127 FunctionPass *createHexagonGenInsert();
128 FunctionPass *createHexagonGenMux();
129 FunctionPass *createHexagonGenPredicate();
130 FunctionPass *createHexagonHardwareLoops();
131 FunctionPass *createHexagonISelDag(HexagonTargetMachine &TM,
132 CodeGenOpt::Level OptLevel);
133 FunctionPass *createHexagonLoopRescheduling();
134 FunctionPass *createHexagonNewValueJump();
135 FunctionPass *createHexagonOptimizeSZextends();
136 FunctionPass *createHexagonOptAddrMode();
137 FunctionPass *createHexagonPacketizer();
138 FunctionPass *createHexagonPeephole();
139 FunctionPass *createHexagonRDFOpt();
140 FunctionPass *createHexagonSplitConst32AndConst64();
141 FunctionPass *createHexagonSplitDoubleRegs();
142 FunctionPass *createHexagonStoreWidening();
143 FunctionPass *createHexagonVectorPrint();
144 } // end namespace llvm;
146 static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
148 return Reloc::Static;
152 extern "C" void LLVMInitializeHexagonTarget() {
153 // Register the target.
154 RegisterTargetMachine<HexagonTargetMachine> X(getTheHexagonTarget());
155 initializeHexagonLoopIdiomRecognizePass(*PassRegistry::getPassRegistry());
156 initializeHexagonOptAddrModePass(*PassRegistry::getPassRegistry());
159 HexagonTargetMachine::HexagonTargetMachine(const Target &T, const Triple &TT,
160 StringRef CPU, StringRef FS,
161 const TargetOptions &Options,
162 Optional<Reloc::Model> RM,
164 CodeGenOpt::Level OL)
165 // Specify the vector alignment explicitly. For v512x1, the calculated
166 // alignment would be 512*alignment(i1), which is 512 bytes, instead of
167 // the required minimum of 64 bytes.
169 T, "e-m:e-p:32:32:32-a:0-n16:32-"
170 "i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-"
171 "v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048",
172 TT, CPU, FS, Options, getEffectiveRelocModel(RM), CM,
173 (HexagonNoOpt ? CodeGenOpt::None : OL)),
174 TLOF(make_unique<HexagonTargetObjectFile>()) {
175 initializeHexagonExpandCondsetsPass(*PassRegistry::getPassRegistry());
179 const HexagonSubtarget *
180 HexagonTargetMachine::getSubtargetImpl(const Function &F) const {
181 AttributeList FnAttrs = F.getAttributes();
183 FnAttrs.getAttribute(AttributeList::FunctionIndex, "target-cpu");
185 FnAttrs.getAttribute(AttributeList::FunctionIndex, "target-features");
187 std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
188 ? CPUAttr.getValueAsString().str()
190 std::string FS = !FSAttr.hasAttribute(Attribute::None)
191 ? FSAttr.getValueAsString().str()
194 auto &I = SubtargetMap[CPU + FS];
196 // This needs to be done before we create a new subtarget since any
197 // creation will depend on the TM and the code generation flags on the
198 // function that reside in TargetOptions.
199 resetTargetOptions(F);
200 I = llvm::make_unique<HexagonSubtarget>(TargetTriple, CPU, FS, *this);
205 void HexagonTargetMachine::adjustPassManager(PassManagerBuilder &PMB) {
207 PassManagerBuilder::EP_LateLoopOptimizations,
208 [&](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
209 PM.add(createHexagonLoopIdiomPass());
213 TargetIRAnalysis HexagonTargetMachine::getTargetIRAnalysis() {
214 return TargetIRAnalysis([this](const Function &F) {
215 return TargetTransformInfo(HexagonTTIImpl(this, F));
220 HexagonTargetMachine::~HexagonTargetMachine() {}
223 /// Hexagon Code Generator Pass Configuration Options.
224 class HexagonPassConfig : public TargetPassConfig {
226 HexagonPassConfig(HexagonTargetMachine *TM, PassManagerBase &PM)
227 : TargetPassConfig(TM, PM) {}
229 HexagonTargetMachine &getHexagonTargetMachine() const {
230 return getTM<HexagonTargetMachine>();
234 createMachineScheduler(MachineSchedContext *C) const override {
235 return createVLIWMachineSched(C);
238 void addIRPasses() override;
239 bool addInstSelector() override;
240 void addPreRegAlloc() override;
241 void addPostRegAlloc() override;
242 void addPreSched2() override;
243 void addPreEmitPass() override;
247 TargetPassConfig *HexagonTargetMachine::createPassConfig(PassManagerBase &PM) {
248 return new HexagonPassConfig(this, PM);
251 void HexagonPassConfig::addIRPasses() {
252 TargetPassConfig::addIRPasses();
253 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
255 addPass(createAtomicExpandPass(TM));
257 if (EnableLoopPrefetch)
258 addPass(createLoopDataPrefetchPass());
260 addPass(createHexagonCommonGEP());
261 // Replace certain combinations of shifts and ands with extracts.
262 if (EnableGenExtract)
263 addPass(createHexagonGenExtract());
267 bool HexagonPassConfig::addInstSelector() {
268 HexagonTargetMachine &TM = getHexagonTargetMachine();
269 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
272 addPass(createHexagonOptimizeSZextends());
274 addPass(createHexagonISelDag(TM, getOptLevel()));
277 // Create logical operations on predicate registers.
279 addPass(createHexagonGenPredicate(), false);
280 // Rotate loops to expose bit-simplification opportunities.
281 if (EnableLoopResched)
282 addPass(createHexagonLoopRescheduling(), false);
283 // Split double registers.
285 addPass(createHexagonSplitDoubleRegs());
286 // Bit simplification.
287 if (EnableBitSimplify)
288 addPass(createHexagonBitSimplify(), false);
289 addPass(createHexagonPeephole());
290 printAndVerify("After hexagon peephole pass");
291 // Constant propagation.
293 addPass(createHexagonConstPropagationPass(), false);
294 addPass(&UnreachableMachineBlockElimID, false);
297 addPass(createHexagonGenInsert(), false);
299 addPass(createHexagonEarlyIfConversion(), false);
305 void HexagonPassConfig::addPreRegAlloc() {
306 if (getOptLevel() != CodeGenOpt::None) {
307 if (EnableExpandCondsets)
308 insertPass(&RegisterCoalescerID, &HexagonExpandCondsetsID);
309 if (!DisableStoreWidening)
310 addPass(createHexagonStoreWidening(), false);
311 if (!DisableHardwareLoops)
312 addPass(createHexagonHardwareLoops(), false);
314 if (TM->getOptLevel() >= CodeGenOpt::Default)
315 addPass(&MachinePipelinerID);
318 void HexagonPassConfig::addPostRegAlloc() {
319 if (getOptLevel() != CodeGenOpt::None) {
321 addPass(createHexagonRDFOpt());
322 if (!DisableHexagonCFGOpt)
323 addPass(createHexagonCFGOptimizer(), false);
324 if (!DisableAModeOpt)
325 addPass(createHexagonOptAddrMode(), false);
329 void HexagonPassConfig::addPreSched2() {
330 addPass(createHexagonCopyToCombine(), false);
331 if (getOptLevel() != CodeGenOpt::None)
332 addPass(&IfConverterID, false);
333 addPass(createHexagonSplitConst32AndConst64());
336 void HexagonPassConfig::addPreEmitPass() {
337 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
340 addPass(createHexagonNewValueJump(), false);
342 addPass(createHexagonBranchRelaxation(), false);
346 if (!DisableHardwareLoops)
347 addPass(createHexagonFixupHwLoops(), false);
348 // Generate MUX from pairs of conditional transfers.
350 addPass(createHexagonGenMux(), false);
352 addPass(createHexagonPacketizer(), false);
354 if (EnableVectorPrint)
355 addPass(createHexagonVectorPrint(), false);
357 // Add CFI instructions if necessary.
358 addPass(createHexagonCallFrameInformation(), false);