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[FreeBSD/stable/9.git] / contrib / llvm / lib / Target / ARM / ARMTargetMachine.cpp
1 //===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
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 //
11 //===----------------------------------------------------------------------===//
12
13 #include "ARMTargetMachine.h"
14 #include "ARMFrameLowering.h"
15 #include "ARM.h"
16 #include "llvm/PassManager.h"
17 #include "llvm/CodeGen/Passes.h"
18 #include "llvm/MC/MCAsmInfo.h"
19 #include "llvm/Support/CommandLine.h"
20 #include "llvm/Support/FormattedStream.h"
21 #include "llvm/Support/TargetRegistry.h"
22 #include "llvm/Target/TargetOptions.h"
23 #include "llvm/Transforms/Scalar.h"
24 using namespace llvm;
25
26 static cl::opt<bool>
27 EnableGlobalMerge("global-merge", cl::Hidden,
28                   cl::desc("Enable global merge pass"),
29                   cl::init(true));
30
31 extern "C" void LLVMInitializeARMTarget() {
32   // Register the target.
33   RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
34   RegisterTargetMachine<ThumbTargetMachine> Y(TheThumbTarget);
35 }
36
37
38 /// TargetMachine ctor - Create an ARM architecture model.
39 ///
40 ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, StringRef TT,
41                                            StringRef CPU, StringRef FS,
42                                            const TargetOptions &Options,
43                                            Reloc::Model RM, CodeModel::Model CM,
44                                            CodeGenOpt::Level OL)
45   : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
46     Subtarget(TT, CPU, FS),
47     JITInfo(),
48     InstrItins(Subtarget.getInstrItineraryData()) {
49   // Default to soft float ABI
50   if (Options.FloatABIType == FloatABI::Default)
51     this->Options.FloatABIType = FloatABI::Soft;
52 }
53
54 void ARMTargetMachine::anchor() { }
55
56 ARMTargetMachine::ARMTargetMachine(const Target &T, StringRef TT,
57                                    StringRef CPU, StringRef FS,
58                                    const TargetOptions &Options,
59                                    Reloc::Model RM, CodeModel::Model CM,
60                                    CodeGenOpt::Level OL)
61   : ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
62     InstrInfo(Subtarget),
63     DataLayout(Subtarget.isAPCS_ABI() ?
64                std::string("e-p:32:32-f64:32:64-i64:32:64-"
65                            "v128:32:128-v64:32:64-n32-S32") :
66                Subtarget.isAAPCS_ABI() ?
67                std::string("e-p:32:32-f64:64:64-i64:64:64-"
68                            "v128:64:128-v64:64:64-n32-S64") :
69                std::string("e-p:32:32-f64:64:64-i64:64:64-"
70                            "v128:64:128-v64:64:64-n32-S32")),
71     ELFWriterInfo(*this),
72     TLInfo(*this),
73     TSInfo(*this),
74     FrameLowering(Subtarget) {
75   if (!Subtarget.hasARMOps())
76     report_fatal_error("CPU: '" + Subtarget.getCPUString() + "' does not "
77                        "support ARM mode execution!");
78 }
79
80 void ThumbTargetMachine::anchor() { }
81
82 ThumbTargetMachine::ThumbTargetMachine(const Target &T, StringRef TT,
83                                        StringRef CPU, StringRef FS,
84                                        const TargetOptions &Options,
85                                        Reloc::Model RM, CodeModel::Model CM,
86                                        CodeGenOpt::Level OL)
87   : ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
88     InstrInfo(Subtarget.hasThumb2()
89               ? ((ARMBaseInstrInfo*)new Thumb2InstrInfo(Subtarget))
90               : ((ARMBaseInstrInfo*)new Thumb1InstrInfo(Subtarget))),
91     DataLayout(Subtarget.isAPCS_ABI() ?
92                std::string("e-p:32:32-f64:32:64-i64:32:64-"
93                            "i16:16:32-i8:8:32-i1:8:32-"
94                            "v128:32:128-v64:32:64-a:0:32-n32-S32") :
95                Subtarget.isAAPCS_ABI() ?
96                std::string("e-p:32:32-f64:64:64-i64:64:64-"
97                            "i16:16:32-i8:8:32-i1:8:32-"
98                            "v128:64:128-v64:64:64-a:0:32-n32-S64") :
99                std::string("e-p:32:32-f64:64:64-i64:64:64-"
100                            "i16:16:32-i8:8:32-i1:8:32-"
101                            "v128:64:128-v64:64:64-a:0:32-n32-S32")),
102     ELFWriterInfo(*this),
103     TLInfo(*this),
104     TSInfo(*this),
105     FrameLowering(Subtarget.hasThumb2()
106               ? new ARMFrameLowering(Subtarget)
107               : (ARMFrameLowering*)new Thumb1FrameLowering(Subtarget)) {
108 }
109
110 namespace {
111 /// ARM Code Generator Pass Configuration Options.
112 class ARMPassConfig : public TargetPassConfig {
113 public:
114   ARMPassConfig(ARMBaseTargetMachine *TM, PassManagerBase &PM)
115     : TargetPassConfig(TM, PM) {}
116
117   ARMBaseTargetMachine &getARMTargetMachine() const {
118     return getTM<ARMBaseTargetMachine>();
119   }
120
121   const ARMSubtarget &getARMSubtarget() const {
122     return *getARMTargetMachine().getSubtargetImpl();
123   }
124
125   virtual bool addPreISel();
126   virtual bool addInstSelector();
127   virtual bool addPreRegAlloc();
128   virtual bool addPreSched2();
129   virtual bool addPreEmitPass();
130 };
131 } // namespace
132
133 TargetPassConfig *ARMBaseTargetMachine::createPassConfig(PassManagerBase &PM) {
134   return new ARMPassConfig(this, PM);
135 }
136
137 bool ARMPassConfig::addPreISel() {
138   if (TM->getOptLevel() != CodeGenOpt::None && EnableGlobalMerge)
139     PM->add(createGlobalMergePass(TM->getTargetLowering()));
140
141   return false;
142 }
143
144 bool ARMPassConfig::addInstSelector() {
145   PM->add(createARMISelDag(getARMTargetMachine(), getOptLevel()));
146   return false;
147 }
148
149 bool ARMPassConfig::addPreRegAlloc() {
150   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
151   if (getOptLevel() != CodeGenOpt::None && !getARMSubtarget().isThumb1Only())
152     PM->add(createARMLoadStoreOptimizationPass(true));
153   if (getOptLevel() != CodeGenOpt::None && getARMSubtarget().isCortexA9())
154     PM->add(createMLxExpansionPass());
155   return true;
156 }
157
158 bool ARMPassConfig::addPreSched2() {
159   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
160   if (getOptLevel() != CodeGenOpt::None) {
161     if (!getARMSubtarget().isThumb1Only()) {
162       PM->add(createARMLoadStoreOptimizationPass());
163       printAndVerify("After ARM load / store optimizer");
164     }
165     if (getARMSubtarget().hasNEON())
166       PM->add(createExecutionDependencyFixPass(&ARM::DPRRegClass));
167   }
168
169   // Expand some pseudo instructions into multiple instructions to allow
170   // proper scheduling.
171   PM->add(createARMExpandPseudoPass());
172
173   if (getOptLevel() != CodeGenOpt::None) {
174     if (!getARMSubtarget().isThumb1Only())
175       addPass(IfConverterID);
176   }
177   if (getARMSubtarget().isThumb2())
178     PM->add(createThumb2ITBlockPass());
179
180   return true;
181 }
182
183 bool ARMPassConfig::addPreEmitPass() {
184   if (getARMSubtarget().isThumb2()) {
185     if (!getARMSubtarget().prefers32BitThumb())
186       PM->add(createThumb2SizeReductionPass());
187
188     // Constant island pass work on unbundled instructions.
189     addPass(UnpackMachineBundlesID);
190   }
191
192   PM->add(createARMConstantIslandPass());
193
194   return true;
195 }
196
197 bool ARMBaseTargetMachine::addCodeEmitter(PassManagerBase &PM,
198                                           JITCodeEmitter &JCE) {
199   // Machine code emitter pass for ARM.
200   PM.add(createARMJITCodeEmitterPass(*this, JCE));
201   return false;
202 }