lib/Target/PowerPC/PPCTargetMachine.cpp

   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 using namespace llvm;
  21
  22 namespace {
  23   // Register the targets
  24   RegisterTarget<PPC32TargetMachine>
  25   X("ppc32", "  PowerPC 32");
  26   RegisterTarget<PPC64TargetMachine>
  27   Y("ppc64", "  PowerPC 64");
  28 }
  29
  30 const TargetAsmInfo *PPCTargetMachine::createTargetAsmInfo() const {
  31   if (Subtarget.isDarwin())
  32     return new DarwinTargetAsmInfo(*this);
  33   else
  34     return new LinuxTargetAsmInfo(*this);
  35 }
  36
  37 unsigned PPC32TargetMachine::getJITMatchQuality() {
  38 #if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) || defined(__PPC__)
  39   if (sizeof(void*) == 4)
  40     return 10;
  41 #endif
  42   return 0;
  43 }
  44 unsigned PPC64TargetMachine::getJITMatchQuality() {
  45 #if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER) || defined(__PPC__)
  46   if (sizeof(void*) == 8)
  47     return 10;
  48 #endif
  49   return 0;
  50 }
  51
  52 unsigned PPC32TargetMachine::getModuleMatchQuality(const Module &M) {
  53   // We strongly match "powerpc-*".
  54   std::string TT = M.getTargetTriple();
  55   if (TT.size() >= 8 && std::string(TT.begin(), TT.begin()+8) == "powerpc-")
  56     return 20;
  57
  58   // If the target triple is something non-powerpc, we don't match.
  59   if (!TT.empty()) return 0;
  60
  61   if (M.getEndianness()  == Module::BigEndian &&
  62       M.getPointerSize() == Module::Pointer32)
  63     return 10;                                   // Weak match
  64   else if (M.getEndianness() != Module::AnyEndianness ||
  65            M.getPointerSize() != Module::AnyPointerSize)
  66     return 0;                                    // Match for some other target
  67
  68   return getJITMatchQuality()/2;
  69 }
  70
  71 unsigned PPC64TargetMachine::getModuleMatchQuality(const Module &M) {
  72   // We strongly match "powerpc64-*".
  73   std::string TT = M.getTargetTriple();
  74   if (TT.size() >= 10 && std::string(TT.begin(), TT.begin()+10) == "powerpc64-")
  75     return 20;
  76
  77   if (M.getEndianness()  == Module::BigEndian &&
  78       M.getPointerSize() == Module::Pointer64)
  79     return 10;                                   // Weak match
  80   else if (M.getEndianness() != Module::AnyEndianness ||
  81            M.getPointerSize() != Module::AnyPointerSize)
  82     return 0;                                    // Match for some other target
  83
  84   return getJITMatchQuality()/2;
  85 }
  86
  87
  88 PPCTargetMachine::PPCTargetMachine(const Module &M, const std::string &FS,
  89                                    bool is64Bit)
  90   : Subtarget(*this, M, FS, is64Bit),
  91     DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this),
  92     FrameInfo(*this, is64Bit), JITInfo(*this, is64Bit), TLInfo(*this),
  93     InstrItins(Subtarget.getInstrItineraryData()), MachOWriterInfo(*this) {
  94
  95   if (getRelocationModel() == Reloc::Default)
  96     if (Subtarget.isDarwin())
  97       setRelocationModel(Reloc::DynamicNoPIC);
  98     else
  99       setRelocationModel(Reloc::Static);
 100 }
 101
 102 /// Override this for PowerPC.  Tail merging happily breaks up instruction issue
 103 /// groups, which typically degrades performance.
 104 bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; }
 105
 106 PPC32TargetMachine::PPC32TargetMachine(const Module &M, const std::string &FS)
 107   : PPCTargetMachine(M, FS, false) {
 108 }
 109
 110
 111 PPC64TargetMachine::PPC64TargetMachine(const Module &M, const std::string &FS)
 112   : PPCTargetMachine(M, FS, true) {
 113 }
 114
 115
 116 //===----------------------------------------------------------------------===//
 117 // Pass Pipeline Configuration
 118 //===----------------------------------------------------------------------===//
 119
 120 bool PPCTargetMachine::addInstSelector(FunctionPassManager &PM, bool Fast) {
 121   // Install an instruction selector.
 122   PM.add(createPPCISelDag(*this));
 123   return false;
 124 }
 125
 126 bool PPCTargetMachine::addPreEmitPass(FunctionPassManager &PM, bool Fast) {
 127
 128   // Must run branch selection immediately preceding the asm printer.
 129   PM.add(createPPCBranchSelectionPass());
 130   return false;
 131 }
 132
 133 bool PPCTargetMachine::addAssemblyEmitter(FunctionPassManager &PM, bool Fast,
 134                                           std::ostream &Out) {
 135   PM.add(createPPCAsmPrinterPass(Out, *this));
 136   return false;
 137 }
 138
 139 bool PPCTargetMachine::addCodeEmitter(FunctionPassManager &PM, bool Fast,
 140                                       bool DumpAsm, MachineCodeEmitter &MCE) {
 141   // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64.
 142   // FIXME: This should be moved to TargetJITInfo!!
 143   if (Subtarget.isPPC64()) {
 144     // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many
 145     // instructions to materialize arbitrary global variable + function +
 146     // constant pool addresses.
 147     setRelocationModel(Reloc::PIC_);
 148   } else {
 149     setRelocationModel(Reloc::Static);
 150   }
 151
 152   // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
 153   // writing?
 154   Subtarget.SetJITMode();
 155
 156   // Machine code emitter pass for PowerPC.
 157   PM.add(createPPCCodeEmitterPass(*this, MCE));
 158   if (DumpAsm)
 159     PM.add(createPPCAsmPrinterPass(*cerr.stream(), *this));
 160   return false;
 161 }
 162
 163 bool PPCTargetMachine::addSimpleCodeEmitter(FunctionPassManager &PM, bool Fast,
 164                                             bool DumpAsm, MachineCodeEmitter &MCE) {
 165   // Machine code emitter pass for PowerPC.
 166   PM.add(createPPCCodeEmitterPass(*this, MCE));
 167   if (DumpAsm)
 168     PM.add(createPPCAsmPrinterPass(*cerr.stream(), *this));
 169   return false;
 170 }