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//===-- ARMExpandPseudoInsts.cpp - Expand pseudo instructions -----*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a pass that expand pseudo instructions into target
// instructions to allow proper scheduling, if-conversion, and other late
// optimizations. This pass should be run after register allocation but before
// post- regalloc scheduling pass.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "arm-pseudo"
#include "ARM.h"
#include "ARMBaseInstrInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
namespace {
class ARMExpandPseudo : public MachineFunctionPass {
// Constants for register spacing in NEON load/store instructions.
enum NEONRegSpacing {
SingleSpc,
EvenDblSpc,
OddDblSpc
};
public:
static char ID;
ARMExpandPseudo() : MachineFunctionPass(ID) {}
const TargetInstrInfo *TII;
const TargetRegisterInfo *TRI;
virtual bool runOnMachineFunction(MachineFunction &Fn);
virtual const char *getPassName() const {
return "ARM pseudo instruction expansion pass";
}
private:
void TransferImpOps(MachineInstr &OldMI,
MachineInstrBuilder &UseMI, MachineInstrBuilder &DefMI);
bool ExpandMBB(MachineBasicBlock &MBB);
void ExpandVST4(MachineBasicBlock::iterator &MBBI, unsigned Opc,
bool hasWriteBack, NEONRegSpacing RegSpc);
};
char ARMExpandPseudo::ID = 0;
}
/// TransferImpOps - Transfer implicit operands on the pseudo instruction to
/// the instructions created from the expansion.
void ARMExpandPseudo::TransferImpOps(MachineInstr &OldMI,
MachineInstrBuilder &UseMI,
MachineInstrBuilder &DefMI) {
const TargetInstrDesc &Desc = OldMI.getDesc();
for (unsigned i = Desc.getNumOperands(), e = OldMI.getNumOperands();
i != e; ++i) {
const MachineOperand &MO = OldMI.getOperand(i);
assert(MO.isReg() && MO.getReg());
if (MO.isUse())
UseMI.addReg(MO.getReg(), getKillRegState(MO.isKill()));
else
DefMI.addReg(MO.getReg(),
getDefRegState(true) | getDeadRegState(MO.isDead()));
}
}
/// ExpandVST4 - Translate VST4 pseudo instructions with QQ or QQQQ register
/// operands to real VST4 instructions with 4 D register operands.
void ARMExpandPseudo::ExpandVST4(MachineBasicBlock::iterator &MBBI,
unsigned Opc, bool hasWriteBack,
NEONRegSpacing RegSpc) {
MachineInstr &MI = *MBBI;
MachineBasicBlock &MBB = *MI.getParent();
MachineInstrBuilder MIB = BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(Opc));
unsigned OpIdx = 0;
if (hasWriteBack) {
bool DstIsDead = MI.getOperand(OpIdx).isDead();
unsigned DstReg = MI.getOperand(OpIdx++).getReg();
MIB.addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead));
}
// Copy the addrmode6 operands.
bool AddrIsKill = MI.getOperand(OpIdx).isKill();
MIB.addReg(MI.getOperand(OpIdx++).getReg(), getKillRegState(AddrIsKill));
MIB.addImm(MI.getOperand(OpIdx++).getImm());
if (hasWriteBack) {
// Copy the am6offset operand.
bool OffsetIsKill = MI.getOperand(OpIdx).isKill();
MIB.addReg(MI.getOperand(OpIdx++).getReg(), getKillRegState(OffsetIsKill));
}
bool SrcIsKill = MI.getOperand(OpIdx).isKill();
unsigned SrcReg = MI.getOperand(OpIdx).getReg();
unsigned D0, D1, D2, D3;
if (RegSpc == SingleSpc) {
D0 = TRI->getSubReg(SrcReg, ARM::dsub_0);
D1 = TRI->getSubReg(SrcReg, ARM::dsub_1);
D2 = TRI->getSubReg(SrcReg, ARM::dsub_2);
D3 = TRI->getSubReg(SrcReg, ARM::dsub_3);
} else if (RegSpc == EvenDblSpc) {
D0 = TRI->getSubReg(SrcReg, ARM::dsub_0);
D1 = TRI->getSubReg(SrcReg, ARM::dsub_2);
D2 = TRI->getSubReg(SrcReg, ARM::dsub_4);
D3 = TRI->getSubReg(SrcReg, ARM::dsub_6);
} else {
assert(RegSpc == OddDblSpc && "unknown register spacing for VST4");
D0 = TRI->getSubReg(SrcReg, ARM::dsub_1);
D1 = TRI->getSubReg(SrcReg, ARM::dsub_3);
D2 = TRI->getSubReg(SrcReg, ARM::dsub_5);
D3 = TRI->getSubReg(SrcReg, ARM::dsub_7);
}
MIB.addReg(D0, getKillRegState(SrcIsKill))
.addReg(D1, getKillRegState(SrcIsKill))
.addReg(D2, getKillRegState(SrcIsKill))
.addReg(D3, getKillRegState(SrcIsKill));
MIB = AddDefaultPred(MIB);
TransferImpOps(MI, MIB, MIB);
MI.eraseFromParent();
}
bool ARMExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {
bool Modified = false;
MachineBasicBlock::iterator MBBI = MBB.begin(), E = MBB.end();
while (MBBI != E) {
MachineInstr &MI = *MBBI;
MachineBasicBlock::iterator NMBBI = llvm::next(MBBI);
bool ModifiedOp = true;
unsigned Opcode = MI.getOpcode();
switch (Opcode) {
default:
ModifiedOp = false;
break;
case ARM::tLDRpci_pic:
case ARM::t2LDRpci_pic: {
unsigned NewLdOpc = (Opcode == ARM::tLDRpci_pic)
? ARM::tLDRpci : ARM::t2LDRpci;
unsigned DstReg = MI.getOperand(0).getReg();
bool DstIsDead = MI.getOperand(0).isDead();
MachineInstrBuilder MIB1 =
AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
TII->get(NewLdOpc), DstReg)
.addOperand(MI.getOperand(1)));
(*MIB1).setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
MachineInstrBuilder MIB2 = BuildMI(MBB, MBBI, MI.getDebugLoc(),
TII->get(ARM::tPICADD))
.addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
.addReg(DstReg)
.addOperand(MI.getOperand(2));
TransferImpOps(MI, MIB1, MIB2);
MI.eraseFromParent();
break;
}
case ARM::t2MOVi32imm: {
unsigned PredReg = 0;
ARMCC::CondCodes Pred = llvm::getInstrPredicate(&MI, PredReg);
unsigned DstReg = MI.getOperand(0).getReg();
bool DstIsDead = MI.getOperand(0).isDead();
const MachineOperand &MO = MI.getOperand(1);
MachineInstrBuilder LO16, HI16;
LO16 = BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(ARM::t2MOVi16),
DstReg);
HI16 = BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(ARM::t2MOVTi16))
.addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
.addReg(DstReg);
if (MO.isImm()) {
unsigned Imm = MO.getImm();
unsigned Lo16 = Imm & 0xffff;
unsigned Hi16 = (Imm >> 16) & 0xffff;
LO16 = LO16.addImm(Lo16);
HI16 = HI16.addImm(Hi16);
} else {
const GlobalValue *GV = MO.getGlobal();
unsigned TF = MO.getTargetFlags();
LO16 = LO16.addGlobalAddress(GV, MO.getOffset(), TF | ARMII::MO_LO16);
HI16 = HI16.addGlobalAddress(GV, MO.getOffset(), TF | ARMII::MO_HI16);
}
(*LO16).setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
(*HI16).setMemRefs(MI.memoperands_begin(), MI.memoperands_end());
LO16.addImm(Pred).addReg(PredReg);
HI16.addImm(Pred).addReg(PredReg);
TransferImpOps(MI, LO16, HI16);
MI.eraseFromParent();
break;
}
case ARM::VMOVQQ: {
unsigned DstReg = MI.getOperand(0).getReg();
bool DstIsDead = MI.getOperand(0).isDead();
unsigned EvenDst = TRI->getSubReg(DstReg, ARM::qsub_0);
unsigned OddDst = TRI->getSubReg(DstReg, ARM::qsub_1);
unsigned SrcReg = MI.getOperand(1).getReg();
bool SrcIsKill = MI.getOperand(1).isKill();
unsigned EvenSrc = TRI->getSubReg(SrcReg, ARM::qsub_0);
unsigned OddSrc = TRI->getSubReg(SrcReg, ARM::qsub_1);
MachineInstrBuilder Even =
AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
TII->get(ARM::VMOVQ))
.addReg(EvenDst,
getDefRegState(true) | getDeadRegState(DstIsDead))
.addReg(EvenSrc, getKillRegState(SrcIsKill)));
MachineInstrBuilder Odd =
AddDefaultPred(BuildMI(MBB, MBBI, MI.getDebugLoc(),
TII->get(ARM::VMOVQ))
.addReg(OddDst,
getDefRegState(true) | getDeadRegState(DstIsDead))
.addReg(OddSrc, getKillRegState(SrcIsKill)));
TransferImpOps(MI, Even, Odd);
MI.eraseFromParent();
}
case ARM::VST4d8Pseudo:
ExpandVST4(MBBI, ARM::VST4d8, false, SingleSpc); break;
case ARM::VST4d16Pseudo:
ExpandVST4(MBBI, ARM::VST4d16, false, SingleSpc); break;
case ARM::VST4d32Pseudo:
ExpandVST4(MBBI, ARM::VST4d32, false, SingleSpc); break;
case ARM::VST4d8Pseudo_UPD:
ExpandVST4(MBBI, ARM::VST4d8_UPD, true, SingleSpc); break;
case ARM::VST4d16Pseudo_UPD:
ExpandVST4(MBBI, ARM::VST4d16_UPD, true, SingleSpc); break;
case ARM::VST4d32Pseudo_UPD:
ExpandVST4(MBBI, ARM::VST4d32_UPD, true, SingleSpc); break;
case ARM::VST4q8Pseudo_UPD:
ExpandVST4(MBBI, ARM::VST4q8_UPD, true, EvenDblSpc); break;
case ARM::VST4q16Pseudo_UPD:
ExpandVST4(MBBI, ARM::VST4q16_UPD, true, EvenDblSpc); break;
case ARM::VST4q32Pseudo_UPD:
ExpandVST4(MBBI, ARM::VST4q32_UPD, true, EvenDblSpc); break;
case ARM::VST4q8oddPseudo_UPD:
ExpandVST4(MBBI, ARM::VST4q8_UPD, true, OddDblSpc); break;
case ARM::VST4q16oddPseudo_UPD:
ExpandVST4(MBBI, ARM::VST4q16_UPD, true, OddDblSpc); break;
case ARM::VST4q32oddPseudo_UPD:
ExpandVST4(MBBI, ARM::VST4q32_UPD, true, OddDblSpc); break;
break;
}
if (ModifiedOp)
Modified = true;
MBBI = NMBBI;
}
return Modified;
}
bool ARMExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
TII = MF.getTarget().getInstrInfo();
TRI = MF.getTarget().getRegisterInfo();
bool Modified = false;
for (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E;
++MFI)
Modified |= ExpandMBB(*MFI);
return Modified;
}
/// createARMExpandPseudoPass - returns an instance of the pseudo instruction
/// expansion pass.
FunctionPass *llvm::createARMExpandPseudoPass() {
return new ARMExpandPseudo();
}
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