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 "PPCTargetMachine.h"
  16 #include "llvm/PassManager.h"
  17 #include "llvm/MC/MCStreamer.h"
  18 #include "llvm/Target/TargetOptions.h"
  19 #include "llvm/Support/FormattedStream.h"
  20 #include "llvm/Support/TargetRegistry.h"
  21 using namespace llvm;
  22
  23 extern "C" void LLVMInitializePowerPCTarget() {
  24   // Register the targets
  25   RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
  26   RegisterTargetMachine<PPC64TargetMachine> B(ThePPC64Target);
  27 }
  28
  29 PPCTargetMachine::PPCTargetMachine(const Target &T, StringRef TT,
  30                                    StringRef CPU, StringRef FS,
  31                                    const TargetOptions &Options,
  32                                    Reloc::Model RM, CodeModel::Model CM,
  33                                    CodeGenOpt::Level OL,
  34                                    bool is64Bit)
  35   : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
  36     Subtarget(TT, CPU, FS, is64Bit),
  37     DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this),
  38     FrameLowering(Subtarget), JITInfo(*this, is64Bit),
  39     TLInfo(*this), TSInfo(*this),
  40     InstrItins(Subtarget.getInstrItineraryData()) {
  41 }
  42
  43 /// Override this for PowerPC.  Tail merging happily breaks up instruction issue
  44 /// groups, which typically degrades performance.
  45 bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; }
  46
  47 PPC32TargetMachine::PPC32TargetMachine(const Target &T, StringRef TT,
  48                                        StringRef CPU, StringRef FS,
  49                                        const TargetOptions &Options,
  50                                        Reloc::Model RM, CodeModel::Model CM,
  51                                        CodeGenOpt::Level OL)
  52   : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false) {
  53 }
  54
  55
  56 PPC64TargetMachine::PPC64TargetMachine(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   : PPCTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true) {
  62 }
  63
  64
  65 //===----------------------------------------------------------------------===//
  66 // Pass Pipeline Configuration
  67 //===----------------------------------------------------------------------===//
  68
  69 bool PPCTargetMachine::addInstSelector(PassManagerBase &PM) {
  70   // Install an instruction selector.
  71   PM.add(createPPCISelDag(*this));
  72   return false;
  73 }
  74
  75 bool PPCTargetMachine::addPreEmitPass(PassManagerBase &PM) {
  76   // Must run branch selection immediately preceding the asm printer.
  77   PM.add(createPPCBranchSelectionPass());
  78   return false;
  79 }
  80
  81 bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
  82                                       JITCodeEmitter &JCE) {
  83   // FIXME: This should be moved to TargetJITInfo!!
  84   if (Subtarget.isPPC64())
  85     // Temporary workaround for the inability of PPC64 JIT to handle jump
  86     // tables.
  87     Options.DisableJumpTables = true;
  88
  89   // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
  90   // writing?
  91   Subtarget.SetJITMode();
  92
  93   // Machine code emitter pass for PowerPC.
  94   PM.add(createPPCJITCodeEmitterPass(*this, JCE));
  95
  96   return false;
  97 }