1 //===-- MipsTargetMachine.cpp - Define TargetMachine for Mips -------------===//
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 Mips target spec.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "MipsTargetMachine.h"
15 #include "Mips.h"
16 #include "MipsFrameLowering.h"
17 #include "MipsInstrInfo.h"
18 #include "MipsModuleISelDAGToDAG.h"
19 #include "MipsOs16.h"
20 #include "MipsSEFrameLowering.h"
21 #include "MipsSEInstrInfo.h"
22 #include "MipsSEISelLowering.h"
23 #include "MipsSEISelDAGToDAG.h"
24 #include "Mips16FrameLowering.h"
25 #include "Mips16HardFloat.h"
26 #include "Mips16InstrInfo.h"
27 #include "Mips16ISelDAGToDAG.h"
28 #include "Mips16ISelLowering.h"
29 #include "llvm/Analysis/TargetTransformInfo.h"
30 #include "llvm/CodeGen/Passes.h"
31 #include "llvm/PassManager.h"
32 #include "llvm/Support/Debug.h"
33 #include "llvm/Support/raw_ostream.h"
34 #include "llvm/Support/TargetRegistry.h"
35 #include "llvm/Transforms/Scalar.h"
36 using namespace llvm;
37
38
39
LLVMInitializeMipsTarget()40 extern "C" void LLVMInitializeMipsTarget() {
41 // Register the target.
42 RegisterTargetMachine<MipsebTargetMachine> X(TheMipsTarget);
43 RegisterTargetMachine<MipselTargetMachine> Y(TheMipselTarget);
44 RegisterTargetMachine<MipsebTargetMachine> A(TheMips64Target);
45 RegisterTargetMachine<MipselTargetMachine> B(TheMips64elTarget);
46 }
47
48 // DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
49 // The stack is always 8 byte aligned
50 // On function prologue, the stack is created by decrementing
51 // its pointer. Once decremented, all references are done with positive
52 // offset from the stack/frame pointer, using StackGrowsUp enables
53 // an easier handling.
54 // Using CodeModel::Large enables different CALL behavior.
55 MipsTargetMachine::
MipsTargetMachine(const Target & T,StringRef TT,StringRef CPU,StringRef FS,const TargetOptions & Options,Reloc::Model RM,CodeModel::Model CM,CodeGenOpt::Level OL,bool isLittle)56 MipsTargetMachine(const Target &T, StringRef TT,
57 StringRef CPU, StringRef FS, const TargetOptions &Options,
58 Reloc::Model RM, CodeModel::Model CM,
59 CodeGenOpt::Level OL,
60 bool isLittle)
61 : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
62 Subtarget(TT, CPU, FS, isLittle, RM, this),
63 DL(isLittle ?
64 (Subtarget.isABI_N64() ?
65 "e-p:64:64:64-i8:8:32-i16:16:32-i64:64:64-f128:128:128-"
66 "n32:64-S128" :
67 "e-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32-S64") :
68 (Subtarget.isABI_N64() ?
69 "E-p:64:64:64-i8:8:32-i16:16:32-i64:64:64-f128:128:128-"
70 "n32:64-S128" :
71 "E-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32-S64")),
72 InstrInfo(MipsInstrInfo::create(*this)),
73 FrameLowering(MipsFrameLowering::create(*this, Subtarget)),
74 TLInfo(MipsTargetLowering::create(*this)), TSInfo(*this),
75 InstrItins(Subtarget.getInstrItineraryData()), JITInfo() {
76 initAsmInfo();
77 }
78
79
setHelperClassesMips16()80 void MipsTargetMachine::setHelperClassesMips16() {
81 InstrInfoSE.swap(InstrInfo);
82 FrameLoweringSE.swap(FrameLowering);
83 TLInfoSE.swap(TLInfo);
84 if (!InstrInfo16) {
85 InstrInfo.reset(MipsInstrInfo::create(*this));
86 FrameLowering.reset(MipsFrameLowering::create(*this, Subtarget));
87 TLInfo.reset(MipsTargetLowering::create(*this));
88 } else {
89 InstrInfo16.swap(InstrInfo);
90 FrameLowering16.swap(FrameLowering);
91 TLInfo16.swap(TLInfo);
92 }
93 assert(TLInfo && "null target lowering 16");
94 assert(InstrInfo && "null instr info 16");
95 assert(FrameLowering && "null frame lowering 16");
96 }
97
setHelperClassesMipsSE()98 void MipsTargetMachine::setHelperClassesMipsSE() {
99 InstrInfo16.swap(InstrInfo);
100 FrameLowering16.swap(FrameLowering);
101 TLInfo16.swap(TLInfo);
102 if (!InstrInfoSE) {
103 InstrInfo.reset(MipsInstrInfo::create(*this));
104 FrameLowering.reset(MipsFrameLowering::create(*this, Subtarget));
105 TLInfo.reset(MipsTargetLowering::create(*this));
106 } else {
107 InstrInfoSE.swap(InstrInfo);
108 FrameLoweringSE.swap(FrameLowering);
109 TLInfoSE.swap(TLInfo);
110 }
111 assert(TLInfo && "null target lowering in SE");
112 assert(InstrInfo && "null instr info SE");
113 assert(FrameLowering && "null frame lowering SE");
114 }
anchor()115 void MipsebTargetMachine::anchor() { }
116
117 MipsebTargetMachine::
MipsebTargetMachine(const Target & T,StringRef TT,StringRef CPU,StringRef FS,const TargetOptions & Options,Reloc::Model RM,CodeModel::Model CM,CodeGenOpt::Level OL)118 MipsebTargetMachine(const Target &T, StringRef TT,
119 StringRef CPU, StringRef FS, const TargetOptions &Options,
120 Reloc::Model RM, CodeModel::Model CM,
121 CodeGenOpt::Level OL)
122 : MipsTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false) {}
123
anchor()124 void MipselTargetMachine::anchor() { }
125
126 MipselTargetMachine::
MipselTargetMachine(const Target & T,StringRef TT,StringRef CPU,StringRef FS,const TargetOptions & Options,Reloc::Model RM,CodeModel::Model CM,CodeGenOpt::Level OL)127 MipselTargetMachine(const Target &T, StringRef TT,
128 StringRef CPU, StringRef FS, const TargetOptions &Options,
129 Reloc::Model RM, CodeModel::Model CM,
130 CodeGenOpt::Level OL)
131 : MipsTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true) {}
132
133 namespace {
134 /// Mips Code Generator Pass Configuration Options.
135 class MipsPassConfig : public TargetPassConfig {
136 public:
MipsPassConfig(MipsTargetMachine * TM,PassManagerBase & PM)137 MipsPassConfig(MipsTargetMachine *TM, PassManagerBase &PM)
138 : TargetPassConfig(TM, PM) {
139 // The current implementation of long branch pass requires a scratch
140 // register ($at) to be available before branch instructions. Tail merging
141 // can break this requirement, so disable it when long branch pass is
142 // enabled.
143 EnableTailMerge = !getMipsSubtarget().enableLongBranchPass();
144 }
145
getMipsTargetMachine() const146 MipsTargetMachine &getMipsTargetMachine() const {
147 return getTM<MipsTargetMachine>();
148 }
149
getMipsSubtarget() const150 const MipsSubtarget &getMipsSubtarget() const {
151 return *getMipsTargetMachine().getSubtargetImpl();
152 }
153
154 virtual void addIRPasses();
155 virtual bool addInstSelector();
156 virtual bool addPreEmitPass();
157 };
158 } // namespace
159
createPassConfig(PassManagerBase & PM)160 TargetPassConfig *MipsTargetMachine::createPassConfig(PassManagerBase &PM) {
161 return new MipsPassConfig(this, PM);
162 }
163
addIRPasses()164 void MipsPassConfig::addIRPasses() {
165 TargetPassConfig::addIRPasses();
166 if (getMipsSubtarget().os16())
167 addPass(createMipsOs16(getMipsTargetMachine()));
168 if (getMipsSubtarget().inMips16HardFloat())
169 addPass(createMips16HardFloat(getMipsTargetMachine()));
170 addPass(createPartiallyInlineLibCallsPass());
171 }
172 // Install an instruction selector pass using
173 // the ISelDag to gen Mips code.
addInstSelector()174 bool MipsPassConfig::addInstSelector() {
175 if (getMipsSubtarget().allowMixed16_32()) {
176 addPass(createMipsModuleISelDag(getMipsTargetMachine()));
177 addPass(createMips16ISelDag(getMipsTargetMachine()));
178 addPass(createMipsSEISelDag(getMipsTargetMachine()));
179 } else {
180 addPass(createMipsISelDag(getMipsTargetMachine()));
181 }
182 return false;
183 }
184
addAnalysisPasses(PassManagerBase & PM)185 void MipsTargetMachine::addAnalysisPasses(PassManagerBase &PM) {
186 if (Subtarget.allowMixed16_32()) {
187 DEBUG(errs() << "No ");
188 //FIXME: The Basic Target Transform Info
189 // pass needs to become a function pass instead of
190 // being an immutable pass and then this method as it exists now
191 // would be unnecessary.
192 PM.add(createNoTargetTransformInfoPass());
193 } else
194 LLVMTargetMachine::addAnalysisPasses(PM);
195 DEBUG(errs() << "Target Transform Info Pass Added\n");
196 }
197
198 // Implemented by targets that want to run passes immediately before
199 // machine code is emitted. return true if -print-machineinstrs should
200 // print out the code after the passes.
addPreEmitPass()201 bool MipsPassConfig::addPreEmitPass() {
202 MipsTargetMachine &TM = getMipsTargetMachine();
203 const MipsSubtarget &Subtarget = TM.getSubtarget<MipsSubtarget>();
204 addPass(createMipsDelaySlotFillerPass(TM));
205
206 if (Subtarget.enableLongBranchPass())
207 addPass(createMipsLongBranchPass(TM));
208 if (Subtarget.inMips16Mode() ||
209 Subtarget.allowMixed16_32())
210 addPass(createMipsConstantIslandPass(TM));
211
212 return true;
213 }
214
addCodeEmitter(PassManagerBase & PM,JITCodeEmitter & JCE)215 bool MipsTargetMachine::addCodeEmitter(PassManagerBase &PM,
216 JITCodeEmitter &JCE) {
217 // Machine code emitter pass for Mips.
218 PM.add(createMipsJITCodeEmitterPass(*this, JCE));
219 return false;
220 }
221