#include "MipsInstrInfo.h"
#include "MipsTargetMachine.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "MipsGenInstrInfo.inc"
using namespace llvm;
MipsInstrInfo::MipsInstrInfo(MipsTargetMachine &tm)
: TargetInstrInfoImpl(MipsInsts, array_lengthof(MipsInsts)),
TM(tm), RI(*TM.getSubtargetImpl(), *this) {}
static bool isZeroImm(const MachineOperand &op) {
return op.isImm() && op.getImm() == 0;
}
bool MipsInstrInfo::
isMoveInstr(const MachineInstr &MI, unsigned &SrcReg, unsigned &DstReg,
unsigned &SrcSubIdx, unsigned &DstSubIdx) const
{
SrcSubIdx = DstSubIdx = 0;
if ((MI.getOpcode() == Mips::ADDu) || (MI.getOpcode() == Mips::OR)) {
if (MI.getOperand(1).getReg() == Mips::ZERO) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(2).getReg();
return true;
} else if (MI.getOperand(2).getReg() == Mips::ZERO) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(1).getReg();
return true;
}
}
if (MI.getOpcode() == Mips::FMOV_S32 ||
MI.getOpcode() == Mips::FMOV_D32 ||
MI.getOpcode() == Mips::MFC1 ||
MI.getOpcode() == Mips::MTC1 ) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(1).getReg();
return true;
}
if (MI.getOpcode() == Mips::ADDiu) {
if ((MI.getOperand(1).isReg()) && (isZeroImm(MI.getOperand(2)))) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(1).getReg();
return true;
}
}
return false;
}
unsigned MipsInstrInfo::
isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const
{
if ((MI->getOpcode() == Mips::LW) || (MI->getOpcode() == Mips::LWC1) ||
(MI->getOpcode() == Mips::LDC1)) {
if ((MI->getOperand(2).isFI()) && (MI->getOperand(1).isImm()) && (isZeroImm(MI->getOperand(1)))) {
FrameIndex = MI->getOperand(2).getIndex();
return MI->getOperand(0).getReg();
}
}
return 0;
}
unsigned MipsInstrInfo::
isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const
{
if ((MI->getOpcode() == Mips::SW) || (MI->getOpcode() == Mips::SWC1) ||
(MI->getOpcode() == Mips::SDC1)) {
if ((MI->getOperand(2).isFI()) && (MI->getOperand(1).isImm()) && (isZeroImm(MI->getOperand(1)))) {
FrameIndex = MI->getOperand(2).getIndex();
return MI->getOperand(0).getReg();
}
}
return 0;
}
void MipsInstrInfo::
insertNoop(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const
{
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
BuildMI(MBB, MI, DL, get(Mips::NOP));
}
bool MipsInstrInfo::
copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const {
DebugLoc DL = DebugLoc::getUnknownLoc();
if (I != MBB.end()) DL = I->getDebugLoc();
if (DestRC != SrcRC) {
if ((DestRC == Mips::CPURegsRegisterClass) &&
(SrcRC == Mips::FGR32RegisterClass))
BuildMI(MBB, I, DL, get(Mips::MFC1), DestReg).addReg(SrcReg);
else if ((DestRC == Mips::FGR32RegisterClass) &&
(SrcRC == Mips::CPURegsRegisterClass))
BuildMI(MBB, I, DL, get(Mips::MTC1), DestReg).addReg(SrcReg);
else if ((SrcRC == Mips::CCRRegisterClass) &&
(SrcReg == Mips::FCR31))
return true; else if ((DestRC == Mips::CCRRegisterClass) &&
(DestReg == Mips::FCR31))
return true;
else if ((DestRC == Mips::HILORegisterClass) &&
(SrcRC == Mips::CPURegsRegisterClass)) {
unsigned Opc = (DestReg == Mips::HI) ? Mips::MTHI : Mips::MTLO;
BuildMI(MBB, I, DL, get(Opc), DestReg);
} else if ((SrcRC == Mips::HILORegisterClass) &&
(DestRC == Mips::CPURegsRegisterClass)) {
unsigned Opc = (SrcReg == Mips::HI) ? Mips::MFHI : Mips::MFLO;
BuildMI(MBB, I, DL, get(Opc), DestReg);
} else
return false;
return true;
}
if (DestRC == Mips::CPURegsRegisterClass)
BuildMI(MBB, I, DL, get(Mips::ADDu), DestReg).addReg(Mips::ZERO)
.addReg(SrcReg);
else if (DestRC == Mips::FGR32RegisterClass)
BuildMI(MBB, I, DL, get(Mips::FMOV_S32), DestReg).addReg(SrcReg);
else if (DestRC == Mips::AFGR64RegisterClass)
BuildMI(MBB, I, DL, get(Mips::FMOV_D32), DestReg).addReg(SrcReg);
else
return false;
return true;
}
void MipsInstrInfo::
storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned SrcReg, bool isKill, int FI,
const TargetRegisterClass *RC) const {
unsigned Opc;
DebugLoc DL = DebugLoc::getUnknownLoc();
if (I != MBB.end()) DL = I->getDebugLoc();
if (RC == Mips::CPURegsRegisterClass)
Opc = Mips::SW;
else if (RC == Mips::FGR32RegisterClass)
Opc = Mips::SWC1;
else {
assert(RC == Mips::AFGR64RegisterClass);
Opc = Mips::SDC1;
}
BuildMI(MBB, I, DL, get(Opc)).addReg(SrcReg, false, false, isKill)
.addImm(0).addFrameIndex(FI);
}
void MipsInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
bool isKill, SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC, SmallVectorImpl<MachineInstr*> &NewMIs) const
{
unsigned Opc;
if (RC == Mips::CPURegsRegisterClass)
Opc = Mips::SW;
else if (RC == Mips::FGR32RegisterClass)
Opc = Mips::SWC1;
else {
assert(RC == Mips::AFGR64RegisterClass);
Opc = Mips::SDC1;
}
DebugLoc DL = DebugLoc::getUnknownLoc();
MachineInstrBuilder MIB = BuildMI(MF, DL, get(Opc))
.addReg(SrcReg, false, false, isKill);
for (unsigned i = 0, e = Addr.size(); i != e; ++i)
MIB.addOperand(Addr[i]);
NewMIs.push_back(MIB);
return;
}
void MipsInstrInfo::
loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned DestReg, int FI,
const TargetRegisterClass *RC) const
{
unsigned Opc;
if (RC == Mips::CPURegsRegisterClass)
Opc = Mips::LW;
else if (RC == Mips::FGR32RegisterClass)
Opc = Mips::LWC1;
else {
assert(RC == Mips::AFGR64RegisterClass);
Opc = Mips::LDC1;
}
DebugLoc DL = DebugLoc::getUnknownLoc();
if (I != MBB.end()) DL = I->getDebugLoc();
BuildMI(MBB, I, DL, get(Opc), DestReg).addImm(0).addFrameIndex(FI);
}
void MipsInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const {
unsigned Opc;
if (RC == Mips::CPURegsRegisterClass)
Opc = Mips::LW;
else if (RC == Mips::FGR32RegisterClass)
Opc = Mips::LWC1;
else {
assert(RC == Mips::AFGR64RegisterClass);
Opc = Mips::LDC1;
}
DebugLoc DL = DebugLoc::getUnknownLoc();
MachineInstrBuilder MIB = BuildMI(MF, DL, get(Opc), DestReg);
for (unsigned i = 0, e = Addr.size(); i != e; ++i)
MIB.addOperand(Addr[i]);
NewMIs.push_back(MIB);
return;
}
MachineInstr *MipsInstrInfo::
foldMemoryOperandImpl(MachineFunction &MF,
MachineInstr* MI,
const SmallVectorImpl<unsigned> &Ops, int FI) const
{
if (Ops.size() != 1) return NULL;
MachineInstr *NewMI = NULL;
switch (MI->getOpcode()) {
case Mips::ADDu:
if ((MI->getOperand(0).isReg()) &&
(MI->getOperand(1).isReg()) &&
(MI->getOperand(1).getReg() == Mips::ZERO) &&
(MI->getOperand(2).isReg())) {
if (Ops[0] == 0) { unsigned SrcReg = MI->getOperand(2).getReg();
bool isKill = MI->getOperand(2).isKill();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(Mips::SW))
.addReg(SrcReg, false, false, isKill)
.addImm(0).addFrameIndex(FI);
} else { unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(Mips::LW))
.addReg(DstReg, true, false, false, isDead)
.addImm(0).addFrameIndex(FI);
}
}
break;
case Mips::FMOV_S32:
case Mips::FMOV_D32:
if ((MI->getOperand(0).isReg()) &&
(MI->getOperand(1).isReg())) {
const TargetRegisterClass
*RC = RI.getRegClass(MI->getOperand(0).getReg());
unsigned StoreOpc, LoadOpc;
if (RC == Mips::FGR32RegisterClass) {
LoadOpc = Mips::LWC1; StoreOpc = Mips::SWC1;
} else {
assert(RC == Mips::AFGR64RegisterClass);
LoadOpc = Mips::LDC1; StoreOpc = Mips::SDC1;
}
if (Ops[0] == 0) { unsigned SrcReg = MI->getOperand(1).getReg();
bool isKill = MI->getOperand(1).isKill();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(StoreOpc))
.addReg(SrcReg, false, false, isKill)
.addImm(0).addFrameIndex(FI) ;
} else { unsigned DstReg = MI->getOperand(0).getReg();
bool isDead = MI->getOperand(0).isDead();
NewMI = BuildMI(MF, MI->getDebugLoc(), get(LoadOpc))
.addReg(DstReg, true, false, false, isDead)
.addImm(0).addFrameIndex(FI);
}
}
break;
}
return NewMI;
}
static Mips::CondCode GetCondFromBranchOpc(unsigned BrOpc)
{
switch (BrOpc) {
default: return Mips::COND_INVALID;
case Mips::BEQ : return Mips::COND_E;
case Mips::BNE : return Mips::COND_NE;
case Mips::BGTZ : return Mips::COND_GZ;
case Mips::BGEZ : return Mips::COND_GEZ;
case Mips::BLTZ : return Mips::COND_LZ;
case Mips::BLEZ : return Mips::COND_LEZ;
case Mips::BC1T :
case Mips::BC1F : return Mips::COND_INVALID;
}
}
unsigned Mips::GetCondBranchFromCond(Mips::CondCode CC)
{
switch (CC) {
default: assert(0 && "Illegal condition code!");
case Mips::COND_E : return Mips::BEQ;
case Mips::COND_NE : return Mips::BNE;
case Mips::COND_GZ : return Mips::BGTZ;
case Mips::COND_GEZ : return Mips::BGEZ;
case Mips::COND_LZ : return Mips::BLTZ;
case Mips::COND_LEZ : return Mips::BLEZ;
case Mips::FCOND_F:
case Mips::FCOND_UN:
case Mips::FCOND_EQ:
case Mips::FCOND_UEQ:
case Mips::FCOND_OLT:
case Mips::FCOND_ULT:
case Mips::FCOND_OLE:
case Mips::FCOND_ULE:
case Mips::FCOND_SF:
case Mips::FCOND_NGLE:
case Mips::FCOND_SEQ:
case Mips::FCOND_NGL:
case Mips::FCOND_LT:
case Mips::FCOND_NGE:
case Mips::FCOND_LE:
case Mips::FCOND_NGT: return Mips::BC1T;
case Mips::FCOND_T:
case Mips::FCOND_OR:
case Mips::FCOND_NEQ:
case Mips::FCOND_OGL:
case Mips::FCOND_UGE:
case Mips::FCOND_OGE:
case Mips::FCOND_UGT:
case Mips::FCOND_OGT:
case Mips::FCOND_ST:
case Mips::FCOND_GLE:
case Mips::FCOND_SNE:
case Mips::FCOND_GL:
case Mips::FCOND_NLT:
case Mips::FCOND_GE:
case Mips::FCOND_NLE:
case Mips::FCOND_GT: return Mips::BC1F;
}
}
Mips::CondCode Mips::GetOppositeBranchCondition(Mips::CondCode CC)
{
switch (CC) {
default: assert(0 && "Illegal condition code!");
case Mips::COND_E : return Mips::COND_NE;
case Mips::COND_NE : return Mips::COND_E;
case Mips::COND_GZ : return Mips::COND_LEZ;
case Mips::COND_GEZ : return Mips::COND_LZ;
case Mips::COND_LZ : return Mips::COND_GEZ;
case Mips::COND_LEZ : return Mips::COND_GZ;
case Mips::FCOND_F : return Mips::FCOND_T;
case Mips::FCOND_UN : return Mips::FCOND_OR;
case Mips::FCOND_EQ : return Mips::FCOND_NEQ;
case Mips::FCOND_UEQ: return Mips::FCOND_OGL;
case Mips::FCOND_OLT: return Mips::FCOND_UGE;
case Mips::FCOND_ULT: return Mips::FCOND_OGE;
case Mips::FCOND_OLE: return Mips::FCOND_UGT;
case Mips::FCOND_ULE: return Mips::FCOND_OGT;
case Mips::FCOND_SF: return Mips::FCOND_ST;
case Mips::FCOND_NGLE:return Mips::FCOND_GLE;
case Mips::FCOND_SEQ: return Mips::FCOND_SNE;
case Mips::FCOND_NGL: return Mips::FCOND_GL;
case Mips::FCOND_LT: return Mips::FCOND_NLT;
case Mips::FCOND_NGE: return Mips::FCOND_GE;
case Mips::FCOND_LE: return Mips::FCOND_NLE;
case Mips::FCOND_NGT: return Mips::FCOND_GT;
}
}
bool MipsInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const
{
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
return false;
MachineInstr *LastInst = I;
unsigned LastOpc = LastInst->getOpcode();
if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
if (!LastInst->getDesc().isBranch())
return true;
if (LastOpc == Mips::J) {
TBB = LastInst->getOperand(0).getMBB();
return false;
}
Mips::CondCode BranchCode = GetCondFromBranchOpc(LastInst->getOpcode());
if (BranchCode == Mips::COND_INVALID)
return true;
if (LastOpc != Mips::COND_INVALID) {
int LastNumOp = LastInst->getNumOperands();
TBB = LastInst->getOperand(LastNumOp-1).getMBB();
Cond.push_back(MachineOperand::CreateImm(BranchCode));
for (int i=0; i<LastNumOp-1; i++) {
Cond.push_back(LastInst->getOperand(i));
}
return false;
}
}
MachineInstr *SecondLastInst = I;
if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
return true;
unsigned SecondLastOpc = SecondLastInst->getOpcode();
Mips::CondCode BranchCode = GetCondFromBranchOpc(SecondLastOpc);
if (BranchCode != Mips::COND_INVALID && LastOpc == Mips::J) {
int SecondNumOp = SecondLastInst->getNumOperands();
TBB = SecondLastInst->getOperand(SecondNumOp-1).getMBB();
Cond.push_back(MachineOperand::CreateImm(BranchCode));
for (int i=0; i<SecondNumOp-1; i++) {
Cond.push_back(SecondLastInst->getOperand(i));
}
FBB = LastInst->getOperand(0).getMBB();
return false;
}
if ((SecondLastOpc == Mips::J) && (LastOpc == Mips::J)) {
TBB = SecondLastInst->getOperand(0).getMBB();
I = LastInst;
if (AllowModify)
I->eraseFromParent();
return false;
}
return true;
}
unsigned MipsInstrInfo::
InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
const SmallVectorImpl<MachineOperand> &Cond) const {
DebugLoc dl = DebugLoc::getUnknownLoc();
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
assert((Cond.size() == 3 || Cond.size() == 2 || Cond.size() == 0) &&
"Mips branch conditions can have two|three components!");
if (FBB == 0) { if (Cond.empty()) {
BuildMI(&MBB, dl, get(Mips::J)).addMBB(TBB);
} else {
unsigned Opc = GetCondBranchFromCond((Mips::CondCode)Cond[0].getImm());
const TargetInstrDesc &TID = get(Opc);
if (TID.getNumOperands() == 3)
BuildMI(&MBB, dl, TID).addReg(Cond[1].getReg())
.addReg(Cond[2].getReg())
.addMBB(TBB);
else
BuildMI(&MBB, dl, TID).addReg(Cond[1].getReg())
.addMBB(TBB);
}
return 1;
}
unsigned Opc = GetCondBranchFromCond((Mips::CondCode)Cond[0].getImm());
const TargetInstrDesc &TID = get(Opc);
if (TID.getNumOperands() == 3)
BuildMI(&MBB, dl, TID).addReg(Cond[1].getReg()).addReg(Cond[2].getReg())
.addMBB(TBB);
else
BuildMI(&MBB, dl, TID).addReg(Cond[1].getReg()).addMBB(TBB);
BuildMI(&MBB, dl, get(Mips::J)).addMBB(FBB);
return 2;
}
unsigned MipsInstrInfo::
RemoveBranch(MachineBasicBlock &MBB) const
{
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin()) return 0;
--I;
if (I->getOpcode() != Mips::J &&
GetCondFromBranchOpc(I->getOpcode()) == Mips::COND_INVALID)
return 0;
I->eraseFromParent();
I = MBB.end();
if (I == MBB.begin()) return 1;
--I;
if (GetCondFromBranchOpc(I->getOpcode()) == Mips::COND_INVALID)
return 1;
I->eraseFromParent();
return 2;
}
bool MipsInstrInfo::
BlockHasNoFallThrough(const MachineBasicBlock &MBB) const
{
if (MBB.empty()) return false;
switch (MBB.back().getOpcode()) {
case Mips::RET: case Mips::JR: case Mips::J: return true;
default: return false;
}
}
bool MipsInstrInfo::
ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const
{
assert( (Cond.size() == 3 || Cond.size() == 2) &&
"Invalid Mips branch condition!");
Cond[0].setImm(GetOppositeBranchCondition((Mips::CondCode)Cond[0].getImm()));
return false;
}