1 //===-- HexagonTargetMachine.cpp - Define TargetMachine for Hexagon -------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Implements the info about Hexagon target spec.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "HexagonTargetMachine.h"
15 #include "Hexagon.h"
16 #include "HexagonISelLowering.h"
17 #include "HexagonMachineScheduler.h"
18 #include "HexagonTargetObjectFile.h"
19 #include "llvm/CodeGen/Passes.h"
20 #include "llvm/IR/LegacyPassManager.h"
21 #include "llvm/IR/Module.h"
22 #include "llvm/Support/CommandLine.h"
23 #include "llvm/Support/TargetRegistry.h"
24 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
25 #include "llvm/Transforms/Scalar.h"
26
27 using namespace llvm;
28
29 static cl:: opt<bool> DisableHardwareLoops("disable-hexagon-hwloops",
30 cl::Hidden, cl::desc("Disable Hardware Loops for Hexagon target"));
31
32 static cl::opt<bool> DisableHexagonCFGOpt("disable-hexagon-cfgopt",
33 cl::Hidden, cl::ZeroOrMore, cl::init(false),
34 cl::desc("Disable Hexagon CFG Optimization"));
35
36 static cl::opt<bool> EnableExpandCondsets("hexagon-expand-condsets",
37 cl::init(true), cl::Hidden, cl::ZeroOrMore,
38 cl::desc("Early expansion of MUX"));
39
40
41 /// HexagonTargetMachineModule - Note that this is used on hosts that
42 /// cannot link in a library unless there are references into the
43 /// library. In particular, it seems that it is not possible to get
44 /// things to work on Win32 without this. Though it is unused, do not
45 /// remove it.
46 extern "C" int HexagonTargetMachineModule;
47 int HexagonTargetMachineModule = 0;
48
LLVMInitializeHexagonTarget()49 extern "C" void LLVMInitializeHexagonTarget() {
50 // Register the target.
51 RegisterTargetMachine<HexagonTargetMachine> X(TheHexagonTarget);
52 }
53
createVLIWMachineSched(MachineSchedContext * C)54 static ScheduleDAGInstrs *createVLIWMachineSched(MachineSchedContext *C) {
55 return new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
56 }
57
58 static MachineSchedRegistry
59 SchedCustomRegistry("hexagon", "Run Hexagon's custom scheduler",
60 createVLIWMachineSched);
61
62 namespace llvm {
63 FunctionPass *createHexagonExpandCondsets();
64 }
65
66 /// HexagonTargetMachine ctor - Create an ILP32 architecture model.
67 ///
68
69 /// Hexagon_TODO: Do I need an aggregate alignment?
70 ///
HexagonTargetMachine(const Target & T,StringRef TT,StringRef CPU,StringRef FS,const TargetOptions & Options,Reloc::Model RM,CodeModel::Model CM,CodeGenOpt::Level OL)71 HexagonTargetMachine::HexagonTargetMachine(const Target &T, StringRef TT,
72 StringRef CPU, StringRef FS,
73 const TargetOptions &Options,
74 Reloc::Model RM, CodeModel::Model CM,
75 CodeGenOpt::Level OL)
76 : LLVMTargetMachine(T, "e-m:e-p:32:32-i1:32-i64:64-a:0-n32", TT, CPU, FS,
77 Options, RM, CM, OL),
78 TLOF(make_unique<HexagonTargetObjectFile>()),
79 Subtarget(TT, CPU, FS, *this) {
80 initAsmInfo();
81 }
82
~HexagonTargetMachine()83 HexagonTargetMachine::~HexagonTargetMachine() {}
84
85 namespace {
86 /// Hexagon Code Generator Pass Configuration Options.
87 class HexagonPassConfig : public TargetPassConfig {
88 public:
HexagonPassConfig(HexagonTargetMachine * TM,PassManagerBase & PM)89 HexagonPassConfig(HexagonTargetMachine *TM, PassManagerBase &PM)
90 : TargetPassConfig(TM, PM) {
91 bool NoOpt = (TM->getOptLevel() == CodeGenOpt::None);
92 if (!NoOpt) {
93 if (EnableExpandCondsets) {
94 Pass *Exp = createHexagonExpandCondsets();
95 insertPass(&RegisterCoalescerID, IdentifyingPassPtr(Exp));
96 }
97 }
98 }
99
getHexagonTargetMachine() const100 HexagonTargetMachine &getHexagonTargetMachine() const {
101 return getTM<HexagonTargetMachine>();
102 }
103
104 ScheduleDAGInstrs *
createMachineScheduler(MachineSchedContext * C) const105 createMachineScheduler(MachineSchedContext *C) const override {
106 return createVLIWMachineSched(C);
107 }
108
109 bool addInstSelector() override;
110 void addPreRegAlloc() override;
111 void addPostRegAlloc() override;
112 void addPreSched2() override;
113 void addPreEmitPass() override;
114 };
115 } // namespace
116
createPassConfig(PassManagerBase & PM)117 TargetPassConfig *HexagonTargetMachine::createPassConfig(PassManagerBase &PM) {
118 return new HexagonPassConfig(this, PM);
119 }
120
addInstSelector()121 bool HexagonPassConfig::addInstSelector() {
122 HexagonTargetMachine &TM = getHexagonTargetMachine();
123 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
124
125 if (!NoOpt)
126 addPass(createHexagonRemoveExtendArgs(TM));
127
128 addPass(createHexagonISelDag(TM, getOptLevel()));
129
130 if (!NoOpt) {
131 addPass(createHexagonPeephole());
132 printAndVerify("After hexagon peephole pass");
133 }
134
135 return false;
136 }
137
addPreRegAlloc()138 void HexagonPassConfig::addPreRegAlloc() {
139 if (getOptLevel() != CodeGenOpt::None)
140 if (!DisableHardwareLoops)
141 addPass(createHexagonHardwareLoops(), false);
142 }
143
addPostRegAlloc()144 void HexagonPassConfig::addPostRegAlloc() {
145 if (getOptLevel() != CodeGenOpt::None)
146 if (!DisableHexagonCFGOpt)
147 addPass(createHexagonCFGOptimizer(), false);
148 }
149
addPreSched2()150 void HexagonPassConfig::addPreSched2() {
151 addPass(createHexagonCopyToCombine(), false);
152 if (getOptLevel() != CodeGenOpt::None)
153 addPass(&IfConverterID, false);
154 addPass(createHexagonSplitConst32AndConst64());
155 }
156
addPreEmitPass()157 void HexagonPassConfig::addPreEmitPass() {
158 bool NoOpt = (getOptLevel() == CodeGenOpt::None);
159
160 if (!NoOpt)
161 addPass(createHexagonNewValueJump(), false);
162
163 // Expand Spill code for predicate registers.
164 addPass(createHexagonExpandPredSpillCode(), false);
165
166 // Create Packets.
167 if (!NoOpt) {
168 if (!DisableHardwareLoops)
169 addPass(createHexagonFixupHwLoops(), false);
170 addPass(createHexagonPacketizer(), false);
171 }
172 }
173