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//===-- Thumb1InstrInfo.cpp - Thumb-1 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 Thumb-1 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "ARMSubtarget.h"
#include "Thumb1InstrInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCInst.h"
using namespace llvm;
Thumb1InstrInfo::Thumb1InstrInfo(const ARMSubtarget &STI)
: ARMBaseInstrInfo(STI), RI() {}
/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
void Thumb1InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
NopInst.setOpcode(ARM::tMOVr);
NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
NopInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
NopInst.addOperand(MCOperand::CreateReg(0));
}
unsigned Thumb1InstrInfo::getUnindexedOpcode(unsigned Opc) const {
return 0;
}
void Thumb1InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I, DebugLoc DL,
unsigned DestReg, unsigned SrcReg,
bool KillSrc) const {
// Need to check the arch.
MachineFunction &MF = *MBB.getParent();
const ARMSubtarget &st = MF.getSubtarget<ARMSubtarget>();
assert(ARM::GPRRegClass.contains(DestReg, SrcReg) &&
"Thumb1 can only copy GPR registers");
if (st.hasV6Ops() || ARM::hGPRRegClass.contains(SrcReg)
|| !ARM::tGPRRegClass.contains(DestReg))
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc)));
else {
// FIXME: The performance consequences of this are going to be atrocious.
// Some things to try that should be better:
// * 'mov hi, $src; mov $dst, hi', with hi as either r10 or r11
// * 'movs $dst, $src' if cpsr isn't live
// See: http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075998.html
// 'MOV lo, lo' is unpredictable on < v6, so use the stack to do it
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tPUSH)))
.addReg(SrcReg, getKillRegState(KillSrc));
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tPOP)))
.addReg(DestReg, getDefRegState(true));
}
}
void Thumb1InstrInfo::
storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned SrcReg, bool isKill, int FI,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
assert((RC == &ARM::tGPRRegClass ||
(TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
isARMLowRegister(SrcReg))) && "Unknown regclass!");
if (RC == &ARM::tGPRRegClass ||
(TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
isARMLowRegister(SrcReg))) {
DebugLoc DL;
if (I != MBB.end()) DL = I->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
MachineFrameInfo &MFI = *MF.getFrameInfo();
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
MachineMemOperand::MOStore,
MFI.getObjectSize(FI),
MFI.getObjectAlignment(FI));
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSTRspi))
.addReg(SrcReg, getKillRegState(isKill))
.addFrameIndex(FI).addImm(0).addMemOperand(MMO));
}
}
void Thumb1InstrInfo::
loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned DestReg, int FI,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
assert((RC == &ARM::tGPRRegClass ||
(TargetRegisterInfo::isPhysicalRegister(DestReg) &&
isARMLowRegister(DestReg))) && "Unknown regclass!");
if (RC == &ARM::tGPRRegClass ||
(TargetRegisterInfo::isPhysicalRegister(DestReg) &&
isARMLowRegister(DestReg))) {
DebugLoc DL;
if (I != MBB.end()) DL = I->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
MachineFrameInfo &MFI = *MF.getFrameInfo();
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
MachineMemOperand::MOLoad,
MFI.getObjectSize(FI),
MFI.getObjectAlignment(FI));
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tLDRspi), DestReg)
.addFrameIndex(FI).addImm(0).addMemOperand(MMO));
}
}
void
Thumb1InstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI,
Reloc::Model RM) const {
if (RM == Reloc::PIC_)
expandLoadStackGuardBase(MI, ARM::tLDRLIT_ga_pcrel, ARM::tLDRi, RM);
else
expandLoadStackGuardBase(MI, ARM::tLDRLIT_ga_abs, ARM::tLDRi, RM);
}
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