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/FormattedStream.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 extern Target TheX86_32Target;
35 static RegisterTarget<X86_32TargetMachine>
36 X(TheX86_32Target, "x86", "32-bit X86: Pentium-Pro and above");
38 extern Target TheX86_64Target;
39 static RegisterTarget<X86_64TargetMachine>
40 Y(TheX86_64Target, "x86-64", "64-bit X86: EM64T and AMD64");
42 // Force static initialization.
43 extern "C" void LLVMInitializeX86Target() {
47 // No assembler printer by default
48 X86TargetMachine::AsmPrinterCtorFn X86TargetMachine::AsmPrinterCtor = 0;
50 const TargetAsmInfo *X86TargetMachine::createTargetAsmInfo() const {
51 if (Subtarget.isFlavorIntel())
52 return new X86WinTargetAsmInfo(*this);
54 switch (Subtarget.TargetType) {
55 case X86Subtarget::isDarwin:
56 return new X86DarwinTargetAsmInfo(*this);
57 case X86Subtarget::isELF:
58 return new X86ELFTargetAsmInfo(*this);
59 case X86Subtarget::isMingw:
60 case X86Subtarget::isCygwin:
61 return new X86COFFTargetAsmInfo(*this);
62 case X86Subtarget::isWindows:
63 return new X86WinTargetAsmInfo(*this);
65 return new X86GenericTargetAsmInfo(*this);
69 unsigned X86_32TargetMachine::getJITMatchQuality() {
70 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
76 unsigned X86_64TargetMachine::getJITMatchQuality() {
77 #if defined(__x86_64__) || defined(_M_AMD64)
83 unsigned X86_32TargetMachine::getModuleMatchQuality(const Module &M) {
84 // We strongly match "i[3-9]86-*".
85 std::string TT = M.getTargetTriple();
86 if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
87 TT[4] == '-' && TT[1] - '3' < 6)
89 // If the target triple is something non-X86, we don't match.
90 if (!TT.empty()) return 0;
92 if (M.getEndianness() == Module::LittleEndian &&
93 M.getPointerSize() == Module::Pointer32)
94 return 10; // Weak match
95 else if (M.getEndianness() != Module::AnyEndianness ||
96 M.getPointerSize() != Module::AnyPointerSize)
97 return 0; // Match for some other target
99 return getJITMatchQuality()/2;
102 unsigned X86_64TargetMachine::getModuleMatchQuality(const Module &M) {
103 // We strongly match "x86_64-*".
104 std::string TT = M.getTargetTriple();
105 if (TT.size() >= 7 && TT[0] == 'x' && TT[1] == '8' && TT[2] == '6' &&
106 TT[3] == '_' && TT[4] == '6' && TT[5] == '4' && TT[6] == '-')
109 // We strongly match "amd64-*".
110 if (TT.size() >= 6 && TT[0] == 'a' && TT[1] == 'm' && TT[2] == 'd' &&
111 TT[3] == '6' && TT[4] == '4' && TT[5] == '-')
114 // If the target triple is something non-X86-64, we don't match.
115 if (!TT.empty()) return 0;
117 if (M.getEndianness() == Module::LittleEndian &&
118 M.getPointerSize() == Module::Pointer64)
119 return 10; // Weak match
120 else if (M.getEndianness() != Module::AnyEndianness ||
121 M.getPointerSize() != Module::AnyPointerSize)
122 return 0; // Match for some other target
124 return getJITMatchQuality()/2;
127 X86_32TargetMachine::X86_32TargetMachine(const Module &M, const std::string &FS)
128 : X86TargetMachine(M, FS, false) {
132 X86_64TargetMachine::X86_64TargetMachine(const Module &M, const std::string &FS)
133 : X86TargetMachine(M, FS, true) {
136 /// X86TargetMachine ctor - Create an X86 target.
138 X86TargetMachine::X86TargetMachine(const Module &M, const std::string &FS,
140 : Subtarget(M, FS, is64Bit),
141 DataLayout(Subtarget.getDataLayout()),
142 FrameInfo(TargetFrameInfo::StackGrowsDown,
143 Subtarget.getStackAlignment(), Subtarget.is64Bit() ? -8 : -4),
144 InstrInfo(*this), JITInfo(*this), TLInfo(*this), ELFWriterInfo(*this) {
145 DefRelocModel = getRelocationModel();
147 // If no relocation model was picked, default as appropriate for the target.
148 if (getRelocationModel() == Reloc::Default) {
149 if (!Subtarget.isTargetDarwin())
150 setRelocationModel(Reloc::Static);
151 else if (Subtarget.is64Bit())
152 setRelocationModel(Reloc::PIC_);
154 setRelocationModel(Reloc::DynamicNoPIC);
157 assert(getRelocationModel() != Reloc::Default &&
158 "Relocation mode not picked");
160 // If no code model is picked, default to small.
161 if (getCodeModel() == CodeModel::Default)
162 setCodeModel(CodeModel::Small);
164 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
165 // is defined as a model for code which may be used in static or dynamic
166 // executables but not necessarily a shared library. On X86-32 we just
167 // compile in -static mode, in x86-64 we use PIC.
168 if (getRelocationModel() == Reloc::DynamicNoPIC) {
170 setRelocationModel(Reloc::PIC_);
171 else if (!Subtarget.isTargetDarwin())
172 setRelocationModel(Reloc::Static);
175 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
176 // the Mach-O file format doesn't support it.
177 if (getRelocationModel() == Reloc::Static &&
178 Subtarget.isTargetDarwin() &&
180 setRelocationModel(Reloc::PIC_);
182 // Determine the PICStyle based on the target selected.
183 if (getRelocationModel() == Reloc::Static) {
184 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
185 Subtarget.setPICStyle(PICStyles::None);
186 } else if (Subtarget.isTargetCygMing()) {
187 Subtarget.setPICStyle(PICStyles::None);
188 } else if (Subtarget.isTargetDarwin()) {
189 if (Subtarget.is64Bit())
190 Subtarget.setPICStyle(PICStyles::RIPRel);
191 else if (getRelocationModel() == Reloc::PIC_)
192 Subtarget.setPICStyle(PICStyles::StubPIC);
194 assert(getRelocationModel() == Reloc::DynamicNoPIC);
195 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
197 } else if (Subtarget.isTargetELF()) {
198 if (Subtarget.is64Bit())
199 Subtarget.setPICStyle(PICStyles::RIPRel);
201 Subtarget.setPICStyle(PICStyles::GOT);
204 // Finally, if we have "none" as our PIC style, force to static mode.
205 if (Subtarget.getPICStyle() == PICStyles::None)
206 setRelocationModel(Reloc::Static);
209 //===----------------------------------------------------------------------===//
210 // Pass Pipeline Configuration
211 //===----------------------------------------------------------------------===//
213 bool X86TargetMachine::addInstSelector(PassManagerBase &PM,
214 CodeGenOpt::Level OptLevel) {
215 // Install an instruction selector.
216 PM.add(createX86ISelDag(*this, OptLevel));
218 // If we're using Fast-ISel, clean up the mess.
220 PM.add(createDeadMachineInstructionElimPass());
222 // Install a pass to insert x87 FP_REG_KILL instructions, as needed.
223 PM.add(createX87FPRegKillInserterPass());
228 bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
229 CodeGenOpt::Level OptLevel) {
230 // Calculate and set max stack object alignment early, so we can decide
231 // whether we will need stack realignment (and thus FP).
232 PM.add(createX86MaxStackAlignmentCalculatorPass());
233 return false; // -print-machineinstr shouldn't print after this.
236 bool X86TargetMachine::addPostRegAlloc(PassManagerBase &PM,
237 CodeGenOpt::Level OptLevel) {
238 PM.add(createX86FloatingPointStackifierPass());
239 return true; // -print-machineinstr should print after this.
242 bool X86TargetMachine::addAssemblyEmitter(PassManagerBase &PM,
243 CodeGenOpt::Level OptLevel,
245 formatted_raw_ostream &Out) {
246 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
248 PM.add(AsmPrinterCtor(Out, *this, Verbose));
252 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
253 CodeGenOpt::Level OptLevel,
255 MachineCodeEmitter &MCE) {
256 // FIXME: Move this to TargetJITInfo!
257 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
258 if (DefRelocModel == Reloc::Default &&
259 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
260 setRelocationModel(Reloc::Static);
261 Subtarget.setPICStyle(PICStyles::None);
264 // 64-bit JIT places everything in the same buffer except external functions.
265 // On Darwin, use small code model but hack the call instruction for
266 // externals. Elsewhere, do not assume globals are in the lower 4G.
267 if (Subtarget.is64Bit()) {
268 if (Subtarget.isTargetDarwin())
269 setCodeModel(CodeModel::Small);
271 setCodeModel(CodeModel::Large);
274 PM.add(createX86CodeEmitterPass(*this, MCE));
276 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
278 PM.add(AsmPrinterCtor(ferrs(), *this, true));
284 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
285 CodeGenOpt::Level OptLevel,
287 JITCodeEmitter &JCE) {
288 // FIXME: Move this to TargetJITInfo!
289 // On Darwin, do not override 64-bit setting made in X86TargetMachine().
290 if (DefRelocModel == Reloc::Default &&
291 (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit())) {
292 setRelocationModel(Reloc::Static);
293 Subtarget.setPICStyle(PICStyles::None);
296 // 64-bit JIT places everything in the same buffer except external functions.
297 // On Darwin, use small code model but hack the call instruction for
298 // externals. Elsewhere, do not assume globals are in the lower 4G.
299 if (Subtarget.is64Bit()) {
300 if (Subtarget.isTargetDarwin())
301 setCodeModel(CodeModel::Small);
303 setCodeModel(CodeModel::Large);
306 PM.add(createX86JITCodeEmitterPass(*this, JCE));
308 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
310 PM.add(AsmPrinterCtor(ferrs(), *this, true));
316 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
317 CodeGenOpt::Level OptLevel,
319 ObjectCodeEmitter &OCE) {
320 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
322 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
324 PM.add(AsmPrinterCtor(ferrs(), *this, true));
330 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
331 CodeGenOpt::Level OptLevel,
333 MachineCodeEmitter &MCE) {
334 PM.add(createX86CodeEmitterPass(*this, MCE));
336 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
338 PM.add(AsmPrinterCtor(ferrs(), *this, true));
344 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
345 CodeGenOpt::Level OptLevel,
347 JITCodeEmitter &JCE) {
348 PM.add(createX86JITCodeEmitterPass(*this, JCE));
350 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
352 PM.add(AsmPrinterCtor(ferrs(), *this, true));
358 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
359 CodeGenOpt::Level OptLevel,
361 ObjectCodeEmitter &OCE) {
362 PM.add(createX86ObjectCodeEmitterPass(*this, OCE));
364 assert(AsmPrinterCtor && "AsmPrinter was not linked in");
366 PM.add(AsmPrinterCtor(ferrs(), *this, true));