1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
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 // This file defines the X86 specific subclass of TargetMachine.
12 //===----------------------------------------------------------------------===//
14 #include "X86TargetAsmInfo.h"
15 #include "X86TargetMachine.h"
17 #include "llvm/Module.h"
18 #include "llvm/PassManager.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/Passes.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include "llvm/Target/TargetOptions.h"
23 #include "llvm/Target/TargetMachineRegistry.h"
26 /// X86TargetMachineModule - Note that this is used on hosts that cannot link
27 /// in a library unless there are references into the library. In particular,
28 /// it seems that it is not possible to get things to work on Win32 without
29 /// this. Though it is unused, do not remove it.
30 extern "C" int X86TargetMachineModule;
31 int X86TargetMachineModule = 0;
33 // Register the target.
34 static RegisterTarget<X86_32TargetMachine>
35 X("x86", "32-bit X86: Pentium-Pro and above");
36 static RegisterTarget<X86_64TargetMachine>
37 Y("x86-64", "64-bit X86: EM64T and AMD64");
39 // Force static initialization.
40 extern "C" void LLVMInitializeX86Target() { }
42 // No assembler printer by default
43 X86TargetMachine::AsmPrinterCtorFn X86TargetMachine::AsmPrinterCtor = 0;
45 const TargetAsmInfo *X86TargetMachine::createTargetAsmInfo() const {
46 if (Subtarget.isFlavorIntel())
47 return new X86WinTargetAsmInfo(*this);
49 switch (Subtarget.TargetType) {
50 case X86Subtarget::isDarwin:
51 return new X86DarwinTargetAsmInfo(*this);
52 case X86Subtarget::isELF:
53 return new X86ELFTargetAsmInfo(*this);
54 case X86Subtarget::isMingw:
55 case X86Subtarget::isCygwin:
56 return new X86COFFTargetAsmInfo(*this);
57 case X86Subtarget::isWindows:
58 return new X86WinTargetAsmInfo(*this);
60 return new X86GenericTargetAsmInfo(*this);
64 unsigned X86_32TargetMachine::getJITMatchQuality() {
65 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
71 unsigned X86_64TargetMachine::getJITMatchQuality() {
72 #if defined(__x86_64__) || defined(_M_AMD64)
78 unsigned X86_32TargetMachine::getModuleMatchQuality(const Module &M) {
79 // We strongly match "i[3-9]86-*".
80 std::string TT = M.getTargetTriple();
81 if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
82 TT[4] == '-' && TT[1] - '3' < 6)
84 // If the target triple is something non-X86, we don't match.
85 if (!TT.empty()) return 0;
87 if (M.getEndianness() == Module::LittleEndian &&
88 M.getPointerSize() == Module::Pointer32)
89 return 10; // Weak match
90 else if (M.getEndianness() != Module::AnyEndianness ||
91 M.getPointerSize() != Module::AnyPointerSize)
92 return 0; // Match for some other target
94 return getJITMatchQuality()/2;
97 unsigned X86_64TargetMachine::getModuleMatchQuality(const Module &M) {
98 // We strongly match "x86_64-*".
99 std::string TT = M.getTargetTriple();
100 if (TT.size() >= 7 && TT[0] == 'x' && TT[1] == '8' && TT[2] == '6' &&
101 TT[3] == '_' && TT[4] == '6' && TT[5] == '4' && TT[6] == '-')
104 // We strongly match "amd64-*".
105 if (TT.size() >= 6 && TT[0] == 'a' && TT[1] == 'm' && TT[2] == 'd' &&
106 TT[3] == '6' && TT[4] == '4' && TT[5] == '-')
109 // If the target triple is something non-X86-64, we don't match.
110 if (!TT.empty()) return 0;
112 if (M.getEndianness() == Module::LittleEndian &&
113 M.getPointerSize() == Module::Pointer64)
114 return 10; // Weak match
115 else if (M.getEndianness() != Module::AnyEndianness ||
116 M.getPointerSize() != Module::AnyPointerSize)
117 return 0; // Match for some other target
119 return getJITMatchQuality()/2;
122 X86_32TargetMachine::X86_32TargetMachine(const Module &M, const std::string &FS)
123 : X86TargetMachine(M, FS, false) {
127 X86_64TargetMachine::X86_64TargetMachine(const Module &M, const std::string &FS)
128 : X86TargetMachine(M, FS, true) {
131 /// X86TargetMachine ctor - Create an ILP32 architecture model
133 X86TargetMachine::X86TargetMachine(const Module &M, const std::string &FS,
135 : Subtarget(M, FS, is64Bit),
136 DataLayout(Subtarget.getDataLayout()),
137 FrameInfo(TargetFrameInfo::StackGrowsDown,
138 Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
139 InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
140 DefRelocModel = getRelocationModel();
141 // FIXME: Correctly select PIC model for Win64 stuff
142 if (getRelocationModel() == Reloc::Default) {
143 if (Subtarget.isTargetDarwin() ||
144 (Subtarget.isTargetCygMing() && !Subtarget.isTargetWin64()))
145 setRelocationModel(Reloc::DynamicNoPIC);
147 setRelocationModel(Reloc::Static);
150 assert(getRelocationModel() != Reloc::Default &&
151 "Relocation mode not picked");
153 // ELF doesn't have a distinct dynamic-no-PIC model. Dynamic-no-PIC
154 // is defined as a model for code which may be used in static or
155 // dynamic executables but not necessarily a shared library. On ELF
156 // implement this by using the Static model.
157 if (Subtarget.isTargetELF() &&
158 getRelocationModel() == Reloc::DynamicNoPIC)
159 setRelocationModel(Reloc::Static);
161 if (Subtarget.is64Bit()) {
162 // No DynamicNoPIC support under X86-64.
163 if (getRelocationModel() == Reloc::DynamicNoPIC)
164 setRelocationModel(Reloc::PIC_);
165 // Default X86-64 code model is small.
166 if (getCodeModel() == CodeModel::Default)
167 setCodeModel(CodeModel::Small);
170 if (Subtarget.isTargetCygMing()) {
171 Subtarget.setPICStyle(PICStyles::None);
172 } else if (Subtarget.isTargetDarwin()) {
173 if (Subtarget.is64Bit())
174 Subtarget.setPICStyle(PICStyles::RIPRel);
176 Subtarget.setPICStyle(PICStyles::Stub);
177 } else if (Subtarget.isTargetELF()) {
178 if (Subtarget.is64Bit())
179 Subtarget.setPICStyle(PICStyles::RIPRel);
181 Subtarget.setPICStyle(PICStyles::GOT);
184 // Finally, unless we're in PIC or DynamicNoPIC mode, set the PIC style to
186 if (getRelocationModel() == Reloc::Static)
187 Subtarget.setPICStyle(PICStyles::None);
190 //===----------------------------------------------------------------------===//
191 // Pass Pipeline Configuration
192 //===----------------------------------------------------------------------===//
194 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
195 CodeGenOpt::Level OptLevel) {
196 // Install an instruction selector.
197 PM.add(createX86ISelDag(*this, OptLevel));
199 // If we're using Fast-ISel, clean up the mess.
201 PM.add(createDeadMachineInstructionElimPass());
203 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
204 PM.add(createX87FPRegKillInserterPass());
209 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
210 CodeGenOpt::Level OptLevel) {
211 // Calculate and set max stack object alignment early, so we can decide
212 // whether we will need stack realignment (and thus FP).
213 PM.add(createX86MaxStackAlignmentCalculatorPass());
214 return false; // -print-machineinstr shouldn't print after this.
217 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
218 CodeGenOpt::Level OptLevel) {
219 PM.add(createX86FloatingPointStackifierPass());
220 return true; // -print-machineinstr should print after this.
223 bool X86TargetMachine::addAssemblyEmitter(PassManagerBase &PM,
224 CodeGenOpt::Level OptLevel,
227 // FIXME: Move this somewhere else!
228 // On Darwin, override 64-bit static relocation to pic_ since the
229 // assembler doesn't support it.
230 if (DefRelocModel == Reloc::Static &&
231 Subtarget.isTargetDarwin() && Subtarget.is64Bit() &&
232 getCodeModel() == CodeModel::Small)
233 setRelocationModel(Reloc::PIC_);
235 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
237 PM.add(AsmPrinterCtor(Out, *this, Verbose));
241 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
242 CodeGenOpt::Level OptLevel,
244 MachineCodeEmitter &MCE) {
245 // FIXME: Move this to TargetJITInfo!
246 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
247 if (DefRelocModel == Reloc::Default &&
248 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit()))
249 setRelocationModel(Reloc::Static);
251 // 64-bit JIT places everything in the same buffer except external functions.
252 // On Darwin, use small code model but hack the call instruction for
253 // externals. Elsewhere, do not assume globals are in the lower 4G.
254 if (Subtarget.is64Bit()) {
255 if (Subtarget.isTargetDarwin())
256 setCodeModel(CodeModel::Small);
258 setCodeModel(CodeModel::Large);
261 PM.add(createX86CodeEmitterPass(*this, MCE));
263 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
265 PM.add(AsmPrinterCtor(errs(), *this, true));
271 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
272 CodeGenOpt::Level OptLevel,
274 JITCodeEmitter &JCE) {
275 // FIXME: Move this to TargetJITInfo!
276 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
277 if (DefRelocModel == Reloc::Default &&
278 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit()))
279 setRelocationModel(Reloc::Static);
281 // 64-bit JIT places everything in the same buffer except external functions.
282 // On Darwin, use small code model but hack the call instruction for
283 // externals. Elsewhere, do not assume globals are in the lower 4G.
284 if (Subtarget.is64Bit()) {
285 if (Subtarget.isTargetDarwin())
286 setCodeModel(CodeModel::Small);
288 setCodeModel(CodeModel::Large);
291 PM.add(createX86JITCodeEmitterPass(*this, JCE));
293 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
295 PM.add(AsmPrinterCtor(errs(), *this, true));
301 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
302 CodeGenOpt::Level OptLevel,
304 ObjectCodeEmitter &OCE) {
305 // FIXME: Move this to TargetJITInfo!
306 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
307 if (DefRelocModel == Reloc::Default &&
308 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit()))
309 setRelocationModel(Reloc::Static);
311 // 64-bit JIT places everything in the same buffer except external functions.
312 // On Darwin, use small code model but hack the call instruction for
313 // externals. Elsewhere, do not assume globals are in the lower 4G.
314 if (Subtarget.is64Bit()) {
315 if (Subtarget.isTargetDarwin())
316 setCodeModel(CodeModel::Small);
318 setCodeModel(CodeModel::Large);
321 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
323 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
325 PM.add(AsmPrinterCtor(errs(), *this, true));
331 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
332 CodeGenOpt::Level OptLevel,
334 MachineCodeEmitter &MCE) {
335 PM.add(createX86CodeEmitterPass(*this, MCE));
337 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
339 PM.add(AsmPrinterCtor(errs(), *this, true));
345 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
346 CodeGenOpt::Level OptLevel,
348 JITCodeEmitter &JCE) {
349 PM.add(createX86JITCodeEmitterPass(*this, JCE));
351 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
353 PM.add(AsmPrinterCtor(errs(), *this, true));
359 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
360 CodeGenOpt::Level OptLevel,
362 ObjectCodeEmitter &OCE) {
363 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
365 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
367 PM.add(AsmPrinterCtor(errs(), *this, true));