1 //===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===// 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 // This file defines the X86 specific subclass of TargetMachine. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "X86TargetMachine.h" 15 #include "X86.h" 16 #include "llvm/PassManager.h" 17 #include "llvm/CodeGen/MachineFunction.h" 18 #include "llvm/CodeGen/Passes.h" 19 #include "llvm/Support/CommandLine.h" 20 #include "llvm/Support/FormattedStream.h" 21 #include "llvm/Target/TargetOptions.h" 22 #include "llvm/Support/TargetRegistry.h" 23 using namespace llvm; 24 25 extern "C" void LLVMInitializeX86Target() { 26 // Register the target. 27 RegisterTargetMachine<X86_32TargetMachine> X(TheX86_32Target); 28 RegisterTargetMachine<X86_64TargetMachine> Y(TheX86_64Target); 29 } 30 31 void X86_32TargetMachine::anchor() { } 32 33 X86_32TargetMachine::X86_32TargetMachine(const Target &T, StringRef TT, 34 StringRef CPU, StringRef FS, 35 const TargetOptions &Options, 36 Reloc::Model RM, CodeModel::Model CM, 37 CodeGenOpt::Level OL) 38 : X86TargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false), 39 DataLayout(getSubtargetImpl()->isTargetDarwin() ? 40 "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-f128:128:128-" 41 "n8:16:32-S128" : 42 (getSubtargetImpl()->isTargetCygMing() || 43 getSubtargetImpl()->isTargetWindows()) ? 44 "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-f128:128:128-" 45 "n8:16:32-S32" : 46 "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-f128:128:128-" 47 "n8:16:32-S128"), 48 InstrInfo(*this), 49 TSInfo(*this), 50 TLInfo(*this), 51 JITInfo(*this) { 52 } 53 54 void X86_64TargetMachine::anchor() { } 55 56 X86_64TargetMachine::X86_64TargetMachine(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 : X86TargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true), 62 DataLayout("e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-f128:128:128-" 63 "n8:16:32:64-S128"), 64 InstrInfo(*this), 65 TSInfo(*this), 66 TLInfo(*this), 67 JITInfo(*this) { 68 } 69 70 /// X86TargetMachine ctor - Create an X86 target. 71 /// 72 X86TargetMachine::X86TargetMachine(const Target &T, StringRef TT, 73 StringRef CPU, StringRef FS, 74 const TargetOptions &Options, 75 Reloc::Model RM, CodeModel::Model CM, 76 CodeGenOpt::Level OL, 77 bool is64Bit) 78 : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL), 79 Subtarget(TT, CPU, FS, Options.StackAlignmentOverride, is64Bit), 80 FrameLowering(*this, Subtarget), 81 ELFWriterInfo(is64Bit, true), 82 InstrItins(Subtarget.getInstrItineraryData()){ 83 // Determine the PICStyle based on the target selected. 84 if (getRelocationModel() == Reloc::Static) { 85 // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None. 86 Subtarget.setPICStyle(PICStyles::None); 87 } else if (Subtarget.is64Bit()) { 88 // PIC in 64 bit mode is always rip-rel. 89 Subtarget.setPICStyle(PICStyles::RIPRel); 90 } else if (Subtarget.isTargetCygMing()) { 91 Subtarget.setPICStyle(PICStyles::None); 92 } else if (Subtarget.isTargetDarwin()) { 93 if (getRelocationModel() == Reloc::PIC_) 94 Subtarget.setPICStyle(PICStyles::StubPIC); 95 else { 96 assert(getRelocationModel() == Reloc::DynamicNoPIC); 97 Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC); 98 } 99 } else if (Subtarget.isTargetELF()) { 100 Subtarget.setPICStyle(PICStyles::GOT); 101 } 102 103 // default to hard float ABI 104 if (Options.FloatABIType == FloatABI::Default) 105 this->Options.FloatABIType = FloatABI::Hard; 106 } 107 108 //===----------------------------------------------------------------------===// 109 // Command line options for x86 110 //===----------------------------------------------------------------------===// 111 static cl::opt<bool> 112 UseVZeroUpper("x86-use-vzeroupper", 113 cl::desc("Minimize AVX to SSE transition penalty"), 114 cl::init(true)); 115 116 //===----------------------------------------------------------------------===// 117 // Pass Pipeline Configuration 118 //===----------------------------------------------------------------------===// 119 120 namespace { 121 /// X86 Code Generator Pass Configuration Options. 122 class X86PassConfig : public TargetPassConfig { 123 public: 124 X86PassConfig(X86TargetMachine *TM, PassManagerBase &PM) 125 : TargetPassConfig(TM, PM) {} 126 127 X86TargetMachine &getX86TargetMachine() const { 128 return getTM<X86TargetMachine>(); 129 } 130 131 const X86Subtarget &getX86Subtarget() const { 132 return *getX86TargetMachine().getSubtargetImpl(); 133 } 134 135 virtual bool addInstSelector(); 136 virtual bool addPreRegAlloc(); 137 virtual bool addPostRegAlloc(); 138 virtual bool addPreEmitPass(); 139 }; 140 } // namespace 141 142 TargetPassConfig *X86TargetMachine::createPassConfig(PassManagerBase &PM) { 143 return new X86PassConfig(this, PM); 144 } 145 146 bool X86PassConfig::addInstSelector() { 147 // Install an instruction selector. 148 PM.add(createX86ISelDag(getX86TargetMachine(), getOptLevel())); 149 150 // For 32-bit, prepend instructions to set the "global base reg" for PIC. 151 if (!getX86Subtarget().is64Bit()) 152 PM.add(createGlobalBaseRegPass()); 153 154 return false; 155 } 156 157 bool X86PassConfig::addPreRegAlloc() { 158 PM.add(createX86MaxStackAlignmentHeuristicPass()); 159 return false; // -print-machineinstr shouldn't print after this. 160 } 161 162 bool X86PassConfig::addPostRegAlloc() { 163 PM.add(createX86FloatingPointStackifierPass()); 164 return true; // -print-machineinstr should print after this. 165 } 166 167 bool X86PassConfig::addPreEmitPass() { 168 bool ShouldPrint = false; 169 if (getOptLevel() != CodeGenOpt::None && getX86Subtarget().hasSSE2()) { 170 PM.add(createExecutionDependencyFixPass(&X86::VR128RegClass)); 171 ShouldPrint = true; 172 } 173 174 if (getX86Subtarget().hasAVX() && UseVZeroUpper) { 175 PM.add(createX86IssueVZeroUpperPass()); 176 ShouldPrint = true; 177 } 178 179 return ShouldPrint; 180 } 181 182 bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM, 183 JITCodeEmitter &JCE) { 184 PM.add(createX86JITCodeEmitterPass(*this, JCE)); 185 186 return false; 187 } 188