//===-- SystemZTargetMachine.cpp - Define TargetMachine for SystemZ -------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "SystemZTargetMachine.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/TargetRegistry.h"

using namespace llvm;

extern "C" void LLVMInitializeSystemZTarget() {
  // Register the target.
  RegisterTargetMachine<SystemZTargetMachine> X(TheSystemZTarget);
}

SystemZTargetMachine::SystemZTargetMachine(const Target &T, StringRef TT,
                                           StringRef CPU, StringRef FS,
                                           const TargetOptions &Options,
                                           Reloc::Model RM,
                                           CodeModel::Model CM,
                                           CodeGenOpt::Level OL)
  : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
    Subtarget(TT, CPU, FS),
    // Make sure that global data has at least 16 bits of alignment by default,
    // so that we can refer to it using LARL.  We don't have any special
    // requirements for stack variables though.
    DL("E-p:64:64:64-i1:8:16-i8:8:16-i16:16-i32:32-i64:64"
       "-f32:32-f64:64-f128:64-a0:8:16-n32:64"),
    InstrInfo(*this), TLInfo(*this), TSInfo(*this),
    FrameLowering(*this, Subtarget) {
  initAsmInfo();
}

namespace {
/// SystemZ Code Generator Pass Configuration Options.
class SystemZPassConfig : public TargetPassConfig {
public:
  SystemZPassConfig(SystemZTargetMachine *TM, PassManagerBase &PM)
    : TargetPassConfig(TM, PM) {}

  SystemZTargetMachine &getSystemZTargetMachine() const {
    return getTM<SystemZTargetMachine>();
  }

  virtual bool addInstSelector() LLVM_OVERRIDE;
  virtual bool addPreEmitPass() LLVM_OVERRIDE;
};
} // end anonymous namespace

bool SystemZPassConfig::addInstSelector() {
  addPass(createSystemZISelDag(getSystemZTargetMachine(), getOptLevel()));
  return false;
}

bool SystemZPassConfig::addPreEmitPass() {
  addPass(createSystemZLongBranchPass(getSystemZTargetMachine()));
  return true;
}

TargetPassConfig *SystemZTargetMachine::createPassConfig(PassManagerBase &PM) {
  return new SystemZPassConfig(this, PM);
}
