path: root/lib/Target/Mips/MipsISelLowering.cpp

//===-- MipsISelLowering.cpp - Mips DAG Lowering Implementation -----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that Mips uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "mips-lower"
#include "MipsISelLowering.h"
#include "MipsMachineFunction.h"
#include "MipsTargetMachine.h"
#include "MipsTargetObjectFile.h"
#include "MipsSubtarget.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Intrinsics.h"
#include "llvm/CallingConv.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;

const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const {
  switch (Opcode) {
    case MipsISD::JmpLink    : return "MipsISD::JmpLink";
    case MipsISD::Hi         : return "MipsISD::Hi";
    case MipsISD::Lo         : return "MipsISD::Lo";
    case MipsISD::GPRel      : return "MipsISD::GPRel";
    case MipsISD::Ret        : return "MipsISD::Ret";
    case MipsISD::CMov       : return "MipsISD::CMov";
    case MipsISD::SelectCC   : return "MipsISD::SelectCC";
    case MipsISD::FPSelectCC : return "MipsISD::FPSelectCC";
    case MipsISD::FPBrcond   : return "MipsISD::FPBrcond";
    case MipsISD::FPCmp      : return "MipsISD::FPCmp";
    case MipsISD::FPRound    : return "MipsISD::FPRound";
    default                  : return NULL;
  }
}

MipsTargetLowering::
MipsTargetLowering(MipsTargetMachine &TM)
  : TargetLowering(TM, new MipsTargetObjectFile()) {
  Subtarget = &TM.getSubtarget<MipsSubtarget>();

  // Mips does not have i1 type, so use i32 for
  // setcc operations results (slt, sgt, ...). 
  setBooleanContents(ZeroOrOneBooleanContent);

  // JumpTable targets must use GOT when using PIC_
  setUsesGlobalOffsetTable(true);

  // Set up the register classes
  addRegisterClass(MVT::i32, Mips::CPURegsRegisterClass);
  addRegisterClass(MVT::f32, Mips::FGR32RegisterClass);

  // When dealing with single precision only, use libcalls
  if (!Subtarget->isSingleFloat())
    if (!Subtarget->isFP64bit())
      addRegisterClass(MVT::f64, Mips::AFGR64RegisterClass);

  // Load extented operations for i1 types must be promoted 
  setLoadExtAction(ISD::EXTLOAD,  MVT::i1,  Promote);
  setLoadExtAction(ISD::ZEXTLOAD, MVT::i1,  Promote);
  setLoadExtAction(ISD::SEXTLOAD, MVT::i1,  Promote);