PPCTargetMachine.cpp revision 98a366d547772010e94609e4584489b3e5ce0043
1//===-- PPCTargetMachine.cpp - Define TargetMachine for PowerPC -----------===// 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// Top-level implementation for the PowerPC target. 11// 12//===----------------------------------------------------------------------===// 13 14#include "PPC.h" 15#include "PPCTargetAsmInfo.h" 16#include "PPCTargetMachine.h" 17#include "llvm/Module.h" 18#include "llvm/PassManager.h" 19#include "llvm/Target/TargetMachineRegistry.h" 20#include "llvm/Target/TargetOptions.h" 21#include "llvm/Support/raw_ostream.h" 22using namespace llvm; 23 24/// PowerPCTargetMachineModule - Note that this is used on hosts that 25/// cannot link in a library unless there are references into the 26/// library. In particular, it seems that it is not possible to get 27/// things to work on Win32 without this. Though it is unused, do not 28/// remove it. 29extern "C" int PowerPCTargetMachineModule; 30int PowerPCTargetMachineModule = 0; 31 32// Register the targets 33static RegisterTarget<PPC32TargetMachine> 34X("ppc32", "PowerPC 32"); 35static RegisterTarget<PPC64TargetMachine> 36Y("ppc64", "PowerPC 64"); 37 38// No assembler printer by default 39PPCTargetMachine::AsmPrinterCtorFn PPCTargetMachine::AsmPrinterCtor = 0; 40 41const TargetAsmInfo *PPCTargetMachine::createTargetAsmInfo() const { 42 if (Subtarget.isDarwin()) 43 return new PPCDarwinTargetAsmInfo(*this); 44 else 45 return new PPCLinuxTargetAsmInfo(*this); 46} 47 48unsigned PPC32TargetMachine::getJITMatchQuality() { 49#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) || defined(__PPC__) 50 if (sizeof(void*) == 4) 51 return 10; 52#endif 53 return 0; 54} 55unsigned PPC64TargetMachine::getJITMatchQuality() { 56#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) || defined(__PPC__) 57 if (sizeof(void*) == 8) 58 return 10; 59#endif 60 return 0; 61} 62 63unsigned PPC32TargetMachine::getModuleMatchQuality(const Module &M) { 64 // We strongly match "powerpc-*". 65 std::string TT = M.getTargetTriple(); 66 if (TT.size() >= 8 && std::string(TT.begin(), TT.begin()+8) == "powerpc-") 67 return 20; 68 69 // If the target triple is something non-powerpc, we don't match. 70 if (!TT.empty()) return 0; 71 72 if (M.getEndianness() == Module::BigEndian && 73 M.getPointerSize() == Module::Pointer32) 74 return 10; // Weak match 75 else if (M.getEndianness() != Module::AnyEndianness || 76 M.getPointerSize() != Module::AnyPointerSize) 77 return 0; // Match for some other target 78 79 return getJITMatchQuality()/2; 80} 81 82unsigned PPC64TargetMachine::getModuleMatchQuality(const Module &M) { 83 // We strongly match "powerpc64-*". 84 std::string TT = M.getTargetTriple(); 85 if (TT.size() >= 10 && std::string(TT.begin(), TT.begin()+10) == "powerpc64-") 86 return 20; 87 88 if (M.getEndianness() == Module::BigEndian && 89 M.getPointerSize() == Module::Pointer64) 90 return 10; // Weak match 91 else if (M.getEndianness() != Module::AnyEndianness || 92 M.getPointerSize() != Module::AnyPointerSize) 93 return 0; // Match for some other target 94 95 return getJITMatchQuality()/2; 96} 97 98 99PPCTargetMachine::PPCTargetMachine(const Module &M, const std::string &FS, 100 bool is64Bit) 101 : Subtarget(*this, M, FS, is64Bit), 102 DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this), 103 FrameInfo(*this, is64Bit), JITInfo(*this, is64Bit), TLInfo(*this), 104 InstrItins(Subtarget.getInstrItineraryData()), MachOWriterInfo(*this) { 105 106 if (getRelocationModel() == Reloc::Default) { 107 if (Subtarget.isDarwin()) 108 setRelocationModel(Reloc::DynamicNoPIC); 109 else 110 setRelocationModel(Reloc::Static); 111 } 112} 113 114/// Override this for PowerPC. Tail merging happily breaks up instruction issue 115/// groups, which typically degrades performance. 116bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; } 117 118PPC32TargetMachine::PPC32TargetMachine(const Module &M, const std::string &FS) 119 : PPCTargetMachine(M, FS, false) { 120} 121 122 123PPC64TargetMachine::PPC64TargetMachine(const Module &M, const std::string &FS) 124 : PPCTargetMachine(M, FS, true) { 125} 126 127 128//===----------------------------------------------------------------------===// 129// Pass Pipeline Configuration 130//===----------------------------------------------------------------------===// 131 132bool PPCTargetMachine::addInstSelector(PassManagerBase &PM, 133 CodeGenOpt::Level OptLevel) { 134 // Install an instruction selector. 135 PM.add(createPPCISelDag(*this)); 136 return false; 137} 138 139bool PPCTargetMachine::addPreEmitPass(PassManagerBase &PM, 140 CodeGenOpt::Level OptLevel) { 141 // Must run branch selection immediately preceding the asm printer. 142 PM.add(createPPCBranchSelectionPass()); 143 return false; 144} 145 146bool PPCTargetMachine::addAssemblyEmitter(PassManagerBase &PM, 147 CodeGenOpt::Level OptLevel, 148 bool Verbose, 149 raw_ostream &Out) { 150 assert(AsmPrinterCtor && "AsmPrinter was not linked in"); 151 if (AsmPrinterCtor) 152 PM.add(AsmPrinterCtor(Out, *this, OptLevel, Verbose)); 153 154 return false; 155} 156 157bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM, 158 CodeGenOpt::Level OptLevel, 159 bool DumpAsm, MachineCodeEmitter &MCE) { 160 // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64. 161 // FIXME: This should be moved to TargetJITInfo!! 162 if (Subtarget.isPPC64()) { 163 // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many 164 // instructions to materialize arbitrary global variable + function + 165 // constant pool addresses. 166 setRelocationModel(Reloc::PIC_); 167 // Temporary workaround for the inability of PPC64 JIT to handle jump 168 // tables. 169 DisableJumpTables = true; 170 } else { 171 setRelocationModel(Reloc::Static); 172 } 173 174 // Inform the subtarget that we are in JIT mode. FIXME: does this break macho 175 // writing? 176 Subtarget.SetJITMode(); 177 178 // Machine code emitter pass for PowerPC. 179 PM.add(createPPCCodeEmitterPass(*this, MCE)); 180 if (DumpAsm) { 181 assert(AsmPrinterCtor && "AsmPrinter was not linked in"); 182 if (AsmPrinterCtor) 183 PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true)); 184 } 185 186 return false; 187} 188 189bool PPCTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM, 190 CodeGenOpt::Level OptLevel, 191 bool DumpAsm, MachineCodeEmitter &MCE) { 192 // Machine code emitter pass for PowerPC. 193 PM.add(createPPCCodeEmitterPass(*this, MCE)); 194 if (DumpAsm) { 195 assert(AsmPrinterCtor && "AsmPrinter was not linked in"); 196 if (AsmPrinterCtor) 197 PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true)); 198 } 199 200 return false; 201} 202