-//===- Thumb1InstrInfo.cpp - Thumb-1 Instruction Information --------*- C++ -*-===//
+//===-- Thumb1InstrInfo.cpp - Thumb-1 Instruction Information -------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "ARMInstrInfo.h"
-#include "ARM.h"
-#include "ARMGenInstrInfo.inc"
-#include "ARMMachineFunctionInfo.h"
+#include "ARMSubtarget.h"
+#include "Thumb1InstrInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/ADT/SmallVector.h"
-#include "Thumb1InstrInfo.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(*this, 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;
}
-unsigned Thumb1InstrInfo::getOpcode(ARMII::Op Op) const {
- switch (Op) {
- case ARMII::ADDri: return ARM::tADDi8;
- case ARMII::ADDrs: return 0;
- case ARMII::ADDrr: return ARM::tADDrr;
- case ARMII::B: return ARM::tB;
- case ARMII::Bcc: return ARM::tBcc;
- case ARMII::BX_RET: return ARM::tBX_RET;
- case ARMII::LDRri: return 0;
- case ARMII::MOVr: return ARM::tMOVr;
- case ARMII::STRri: return 0;
- case ARMII::SUBri: return ARM::tSUBi8;
- case ARMII::SUBrs: return 0;
- case ARMII::SUBrr: return ARM::tSUBrr;
- default:
- break;
- }
-
- return 0;
-}
-
-bool
-Thumb1InstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
- if (MBB.empty()) return false;
-
- switch (MBB.back().getOpcode()) {
- case ARM::tBX_RET:
- case ARM::tBX_RET_vararg:
- case ARM::tPOP_RET:
- case ARM::tB:
- case ARM::tBR_JTr:
- return true;
- default:
- break;
- }
-
- return false;
-}
-
-bool Thumb1InstrInfo::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 == ARM::GPRRegisterClass) {
- if (SrcRC == ARM::GPRRegisterClass) {
- BuildMI(MBB, I, DL, get(ARM::tMOVgpr2gpr), DestReg).addReg(SrcReg);
- return true;
- } else if (SrcRC == ARM::tGPRRegisterClass) {
- BuildMI(MBB, I, DL, get(ARM::tMOVtgpr2gpr), DestReg).addReg(SrcReg);
- return true;
- }
- } else if (DestRC == ARM::tGPRRegisterClass) {
- if (SrcRC == ARM::GPRRegisterClass) {
- BuildMI(MBB, I, DL, get(ARM::tMOVgpr2tgpr), DestReg).addReg(SrcReg);
- return true;
- } else if (SrcRC == ARM::tGPRRegisterClass) {
- BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg).addReg(SrcReg);
- return true;
- }
- }
-
- return false;
-}
-
-bool Thumb1InstrInfo::
-canFoldMemoryOperand(const MachineInstr *MI,
- const SmallVectorImpl<unsigned> &Ops) const {
- if (Ops.size() != 1) return false;
-
- unsigned OpNum = Ops[0];
- unsigned Opc = MI->getOpcode();
- switch (Opc) {
- default: break;
- case ARM::tMOVr:
- case ARM::tMOVtgpr2gpr:
- case ARM::tMOVgpr2tgpr:
- case ARM::tMOVgpr2gpr: {
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
- // tSpill cannot take a high register operand.
- return false;
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
- // tRestore cannot target a high register operand.
- return false;
- }
- return true;
- }
+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.llvm.org/pipermail/llvm-dev/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));
}
-
- return false;
}
void Thumb1InstrInfo::
storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned SrcReg, bool isKill, int FI,
- const TargetRegisterClass *RC) const {
- DebugLoc DL = DebugLoc::getUnknownLoc();
- if (I != MBB.end()) DL = I->getDebugLoc();
-
- assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
-
- if (RC == ARM::tGPRRegisterClass) {
- AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSpill))
+ 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(MF, 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));
+ .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
}
}
void Thumb1InstrInfo::
loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned DestReg, int FI,
- const TargetRegisterClass *RC) const {
- DebugLoc DL = DebugLoc::getUnknownLoc();
- if (I != MBB.end()) DL = I->getDebugLoc();
-
- assert(RC == ARM::tGPRRegisterClass && "Unknown regclass!");
-
- if (RC == ARM::tGPRRegisterClass) {
- AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tRestore), DestReg)
- .addFrameIndex(FI).addImm(0));
+ 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(MF, FI), MachineMemOperand::MOLoad,
+ MFI.getObjectSize(FI), MFI.getObjectAlignment(FI));
+ AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tLDRspi), DestReg)
+ .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
}
}
-bool Thumb1InstrInfo::
-spillCalleeSavedRegisters(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- const std::vector<CalleeSavedInfo> &CSI) const {
- if (CSI.empty())
- return false;
-
- DebugLoc DL = DebugLoc::getUnknownLoc();
- if (MI != MBB.end()) DL = MI->getDebugLoc();
-
- MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, get(ARM::tPUSH));
- for (unsigned i = CSI.size(); i != 0; --i) {
- unsigned Reg = CSI[i-1].getReg();
- // Add the callee-saved register as live-in. It's killed at the spill.
- MBB.addLiveIn(Reg);
- MIB.addReg(Reg, RegState::Kill);
- }
- return true;
-}
-
-bool Thumb1InstrInfo::
-restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- const std::vector<CalleeSavedInfo> &CSI) const {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (CSI.empty())
- return false;
-
- bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
- MachineInstr *PopMI = MF.CreateMachineInstr(get(ARM::tPOP),MI->getDebugLoc());
- for (unsigned i = CSI.size(); i != 0; --i) {
- unsigned Reg = CSI[i-1].getReg();
- if (Reg == ARM::LR) {
- // Special epilogue for vararg functions. See emitEpilogue
- if (isVarArg)
- continue;
- Reg = ARM::PC;
- PopMI->setDesc(get(ARM::tPOP_RET));
- MI = MBB.erase(MI);
- }
- PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
- }
-
- // It's illegal to emit pop instruction without operands.
- if (PopMI->getNumOperands() > 0)
- MBB.insert(MI, PopMI);
-
- return true;
-}
-
-MachineInstr *Thumb1InstrInfo::
-foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
- const SmallVectorImpl<unsigned> &Ops, int FI) const {
- if (Ops.size() != 1) return NULL;
-
- unsigned OpNum = Ops[0];
- unsigned Opc = MI->getOpcode();
- MachineInstr *NewMI = NULL;
- switch (Opc) {
- default: break;
- case ARM::tMOVr:
- case ARM::tMOVtgpr2gpr:
- case ARM::tMOVgpr2tgpr:
- case ARM::tMOVgpr2gpr: {
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- bool isKill = MI->getOperand(1).isKill();
- if (RI.isPhysicalRegister(SrcReg) && !isARMLowRegister(SrcReg))
- // tSpill cannot take a high register operand.
- break;
- NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tSpill))
- .addReg(SrcReg, getKillRegState(isKill))
- .addFrameIndex(FI).addImm(0));
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- if (RI.isPhysicalRegister(DstReg) && !isARMLowRegister(DstReg))
- // tRestore cannot target a high register operand.
- break;
- bool isDead = MI->getOperand(0).isDead();
- NewMI = AddDefaultPred(BuildMI(MF, MI->getDebugLoc(), get(ARM::tRestore))
- .addReg(DstReg,
- RegState::Define | getDeadRegState(isDead))
- .addFrameIndex(FI).addImm(0));
- }
- break;
- }
- }
-
- return NewMI;
+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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