1 //===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
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 //===----------------------------------------------------------------------===//
11 //===----------------------------------------------------------------------===//
13 #include "ARMTargetMachine.h"
14 #include "ARMFrameLowering.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"
27 EnableGlobalMerge("global-merge", cl::Hidden,
28 cl::desc("Enable global merge pass"),
31 extern "C" void LLVMInitializeARMTarget() {
32 // Register the target.
33 RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
34 RegisterTargetMachine<ThumbTargetMachine> Y(TheThumbTarget);
38 /// TargetMachine ctor - Create an ARM architecture model.
40 ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, StringRef TT,
41 StringRef CPU, StringRef FS,
42 const TargetOptions &Options,
43 Reloc::Model RM, CodeModel::Model CM,
45 : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
46 Subtarget(TT, CPU, FS),
48 InstrItins(Subtarget.getInstrItineraryData()) {
49 // Default to soft float ABI
50 if (Options.FloatABIType == FloatABI::Default)
51 this->Options.FloatABIType = FloatABI::Soft;
54 void ARMTargetMachine::anchor() { }
56 ARMTargetMachine::ARMTargetMachine(const Target &T, StringRef TT,
57 StringRef CPU, StringRef FS,
58 const TargetOptions &Options,
59 Reloc::Model RM, CodeModel::Model CM,
61 : ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
63 DL(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")),
74 FrameLowering(Subtarget) {
75 if (!Subtarget.hasARMOps())
76 report_fatal_error("CPU: '" + Subtarget.getCPUString() + "' does not "
77 "support ARM mode execution!");
80 void ThumbTargetMachine::anchor() { }
82 ThumbTargetMachine::ThumbTargetMachine(const Target &T, StringRef TT,
83 StringRef CPU, StringRef FS,
84 const TargetOptions &Options,
85 Reloc::Model RM, CodeModel::Model CM,
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 DL(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),
105 FrameLowering(Subtarget.hasThumb2()
106 ? new ARMFrameLowering(Subtarget)
107 : (ARMFrameLowering*)new Thumb1FrameLowering(Subtarget)) {
111 /// ARM Code Generator Pass Configuration Options.
112 class ARMPassConfig : public TargetPassConfig {
114 ARMPassConfig(ARMBaseTargetMachine *TM, PassManagerBase &PM)
115 : TargetPassConfig(TM, PM) {}
117 ARMBaseTargetMachine &getARMTargetMachine() const {
118 return getTM<ARMBaseTargetMachine>();
121 const ARMSubtarget &getARMSubtarget() const {
122 return *getARMTargetMachine().getSubtargetImpl();
125 virtual bool addPreISel();
126 virtual bool addInstSelector();
127 virtual bool addPreRegAlloc();
128 virtual bool addPreSched2();
129 virtual bool addPreEmitPass();
133 TargetPassConfig *ARMBaseTargetMachine::createPassConfig(PassManagerBase &PM) {
134 return new ARMPassConfig(this, PM);
137 bool ARMPassConfig::addPreISel() {
138 if (TM->getOptLevel() != CodeGenOpt::None && EnableGlobalMerge)
139 addPass(createGlobalMergePass(TM->getTargetLowering()));
144 bool ARMPassConfig::addInstSelector() {
145 addPass(createARMISelDag(getARMTargetMachine(), getOptLevel()));
147 const ARMSubtarget *Subtarget = &getARMSubtarget();
148 if (Subtarget->isTargetELF() && !Subtarget->isThumb1Only() &&
149 TM->Options.EnableFastISel)
150 addPass(createARMGlobalBaseRegPass());
154 bool ARMPassConfig::addPreRegAlloc() {
155 // FIXME: temporarily disabling load / store optimization pass for Thumb1.
156 if (getOptLevel() != CodeGenOpt::None && !getARMSubtarget().isThumb1Only())
157 addPass(createARMLoadStoreOptimizationPass(true));
158 if (getOptLevel() != CodeGenOpt::None && getARMSubtarget().isLikeA9())
159 addPass(createMLxExpansionPass());
163 bool ARMPassConfig::addPreSched2() {
164 // FIXME: temporarily disabling load / store optimization pass for Thumb1.
165 if (getOptLevel() != CodeGenOpt::None) {
166 if (!getARMSubtarget().isThumb1Only()) {
167 addPass(createARMLoadStoreOptimizationPass());
168 printAndVerify("After ARM load / store optimizer");
170 if (getARMSubtarget().hasNEON())
171 addPass(createExecutionDependencyFixPass(&ARM::DPRRegClass));
174 // Expand some pseudo instructions into multiple instructions to allow
175 // proper scheduling.
176 addPass(createARMExpandPseudoPass());
178 if (getOptLevel() != CodeGenOpt::None) {
179 if (!getARMSubtarget().isThumb1Only())
180 addPass(&IfConverterID);
182 if (getARMSubtarget().isThumb2())
183 addPass(createThumb2ITBlockPass());
188 bool ARMPassConfig::addPreEmitPass() {
189 if (getARMSubtarget().isThumb2()) {
190 if (!getARMSubtarget().prefers32BitThumb())
191 addPass(createThumb2SizeReductionPass());
193 // Constant island pass work on unbundled instructions.
194 addPass(&UnpackMachineBundlesID);
197 addPass(createARMConstantIslandPass());
202 bool ARMBaseTargetMachine::addCodeEmitter(PassManagerBase &PM,
203 JITCodeEmitter &JCE) {
204 // Machine code emitter pass for ARM.
205 PM.add(createARMJITCodeEmitterPass(*this, JCE));