//===-- WDC65816InstrInfo.cpp - WDC65816 Instruction Information ----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the WDC65816 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#include "WDC65816InstrInfo.h"
#include "WDC65816.h"
#include "WDC65816MachineFunctionInfo.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"

#define GET_INSTRINFO_CTOR_DTOR
#include "WDC65816GenInstrInfo.inc"

using namespace llvm;


// Pin the vtable to this file.
void WDC65816InstrInfo::anchor() {}

WDC65816InstrInfo::WDC65816InstrInfo(void)
: WDC65816GenInstrInfo(WDC::ADJCALLSTACKDOWN, WDC::ADJCALLSTACKUP),
RI() {
}


unsigned WDC65816InstrInfo::getGlobalBaseReg(MachineFunction *MF) const
{
    WDC65816MachineFunctionInfo *WDC65816FI = MF->getInfo<WDC65816MachineFunctionInfo>();
    
    return WDC65816FI->getGlobalBaseReg();
    
#if 0 // WDC_TODO - Do something better here...
    unsigned GlobalBaseReg = WDC65816FI->getGlobalBaseReg();
    if (GlobalBaseReg != 0)
        return GlobalBaseReg;
    
    // Insert the set of GlobalBaseReg into the first MBB of the function
    MachineBasicBlock &FirstMBB = MF->front();
    MachineBasicBlock::iterator MBBI = FirstMBB.begin();
    MachineRegisterInfo &RegInfo = MF->getRegInfo();
    
    GlobalBaseReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
    
    DebugLoc dl;
    
    BuildMI(FirstMBB, MBBI, dl, get(SP::GETPCX), GlobalBaseReg);
    SparcFI->setGlobalBaseReg(GlobalBaseReg);
    return GlobalBaseReg;
#endif
}