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//===-- MipsRegisterInfo.cpp - MIPS Register 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 MIPS implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-reg-info"
#include "MipsRegisterInfo.h"
#include "Mips.h"
#include "MipsAnalyzeImmediate.h"
#include "MipsInstrInfo.h"
#include "MipsMachineFunction.h"
#include "MipsSubtarget.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/DebugInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#define GET_REGINFO_TARGET_DESC
#include "MipsGenRegisterInfo.inc"
using namespace llvm;
MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST)
: MipsGenRegisterInfo(Mips::RA), Subtarget(ST) {}
unsigned MipsRegisterInfo::getPICCallReg() { return Mips::T9; }
unsigned
MipsRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const {
switch (RC->getID()) {
default:
return 0;
case Mips::CPURegsRegClassID:
case Mips::CPU64RegsRegClassID:
case Mips::DSPRegsRegClassID: {
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
return 28 - TFI->hasFP(MF);
}
case Mips::FGR32RegClassID:
return 32;
case Mips::AFGR64RegClassID:
return 16;
case Mips::FGR64RegClassID:
return 32;
}
}
//===----------------------------------------------------------------------===//
// Callee Saved Registers methods
//===----------------------------------------------------------------------===//
/// Mips Callee Saved Registers
const uint16_t* MipsRegisterInfo::
getCalleeSavedRegs(const MachineFunction *MF) const {
if (Subtarget.isSingleFloat())
return CSR_SingleFloatOnly_SaveList;
else if (!Subtarget.hasMips64())
return CSR_O32_SaveList;
else if (Subtarget.isABI_N32())
return CSR_N32_SaveList;
assert(Subtarget.isABI_N64());
return CSR_N64_SaveList;
}
const uint32_t*
MipsRegisterInfo::getCallPreservedMask(CallingConv::ID) const {
if (Subtarget.isSingleFloat())
return CSR_SingleFloatOnly_RegMask;
else if (!Subtarget.hasMips64())
return CSR_O32_RegMask;
else if (Subtarget.isABI_N32())
return CSR_N32_RegMask;
assert(Subtarget.isABI_N64());
return CSR_N64_RegMask;
}
BitVector MipsRegisterInfo::
getReservedRegs(const MachineFunction &MF) const {
static const uint16_t ReservedCPURegs[] = {
Mips::ZERO, Mips::K0, Mips::K1, Mips::SP
};
static const uint16_t ReservedCPU64Regs[] = {
Mips::ZERO_64, Mips::K0_64, Mips::K1_64, Mips::SP_64
};
BitVector Reserved(getNumRegs());
typedef TargetRegisterClass::const_iterator RegIter;
for (unsigned I = 0; I < array_lengthof(ReservedCPURegs); ++I)
Reserved.set(ReservedCPURegs[I]);
for (unsigned I = 0; I < array_lengthof(ReservedCPU64Regs); ++I)
Reserved.set(ReservedCPU64Regs[I]);
if (Subtarget.hasMips64()) {
// Reserve all registers in AFGR64.
for (RegIter Reg = Mips::AFGR64RegClass.begin(),
EReg = Mips::AFGR64RegClass.end(); Reg != EReg; ++Reg)
Reserved.set(*Reg);
} else {
// Reserve all registers in FGR64.
for (RegIter Reg = Mips::FGR64RegClass.begin(),
EReg = Mips::FGR64RegClass.end(); Reg != EReg; ++Reg)
Reserved.set(*Reg);
}
// Reserve FP if this function should have a dedicated frame pointer register.
if (MF.getTarget().getFrameLowering()->hasFP(MF)) {
if (Subtarget.inMips16Mode())
Reserved.set(Mips::S0);
else {
Reserved.set(Mips::FP);
Reserved.set(Mips::FP_64);
}
}
// Reserve hardware registers.
Reserved.set(Mips::HWR29);
Reserved.set(Mips::HWR29_64);
// Reserve DSP control register.
Reserved.set(Mips::DSPPos);
Reserved.set(Mips::DSPSCount);
Reserved.set(Mips::DSPCarry);
Reserved.set(Mips::DSPEFI);
Reserved.set(Mips::DSPOutFlag);
// Reserve RA if in mips16 mode.
if (Subtarget.inMips16Mode()) {
Reserved.set(Mips::RA);
Reserved.set(Mips::RA_64);
}
// Reserve GP if small section is used.
if (Subtarget.useSmallSection()) {
Reserved.set(Mips::GP);
Reserved.set(Mips::GP_64);
}
return Reserved;
}
bool
MipsRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
return true;
}
bool
MipsRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
return true;
}
// FrameIndex represent objects inside a abstract stack.
// We must replace FrameIndex with an stack/frame pointer
// direct reference.
void MipsRegisterInfo::
eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
unsigned FIOperandNum, RegScavenger *RS) const {
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
DEBUG(errs() << "\nFunction : " << MF.getName() << "\n";
errs() << "<--------->\n" << MI);
int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
uint64_t stackSize = MF.getFrameInfo()->getStackSize();
int64_t spOffset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
DEBUG(errs() << "FrameIndex : " << FrameIndex << "\n"
<< "spOffset : " << spOffset << "\n"
<< "stackSize : " << stackSize << "\n");
eliminateFI(MI, FIOperandNum, FrameIndex, stackSize, spOffset);
}
unsigned MipsRegisterInfo::
getFrameRegister(const MachineFunction &MF) const {
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
bool IsN64 = Subtarget.isABI_N64();
if (Subtarget.inMips16Mode())
return TFI->hasFP(MF) ? Mips::S0 : Mips::SP;
else
return TFI->hasFP(MF) ? (IsN64 ? Mips::FP_64 : Mips::FP) :
(IsN64 ? Mips::SP_64 : Mips::SP);
}
unsigned MipsRegisterInfo::
getEHExceptionRegister() const {
llvm_unreachable("What is the exception register");
}
unsigned MipsRegisterInfo::
getEHHandlerRegister() const {
llvm_unreachable("What is the exception handler register");
}
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