-//===- ARMInstrInfo.cpp - ARM Instruction Information -----------*- C++ -*-===//
+//===-- ARMInstrInfo.cpp - ARM Instruction Information --------------------===//
//
// The LLVM Compiler Infrastructure
//
#include "ARMInstrInfo.h"
#include "ARM.h"
-#include "ARMAddressingModes.h"
-#include "ARMGenInstrInfo.inc"
+#include "ARMConstantPoolValue.h"
#include "ARMMachineFunctionInfo.h"
+#include "ARMTargetMachine.h"
+#include "MCTargetDesc/ARMAddressingModes.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
-#include "llvm/Target/TargetAsmInfo.h"
-#include "llvm/Support/CommandLine.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCInst.h"
using namespace llvm;
-static cl::opt<bool> EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
- cl::desc("Enable ARM 2-addr to 3-addr conv"));
-
-static inline
-const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
- return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
-}
-
-static inline
-const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
- return MIB.addReg(0);
-}
-
ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
- : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)),
- RI(*this, STI) {
-}
-
-const TargetRegisterClass *ARMInstrInfo::getPointerRegClass() const {
- return &ARM::GPRRegClass;
-}
-
-/// Return true if the instruction is a register to register move and
-/// leave the source and dest operands in the passed parameters.
-///
-bool ARMInstrInfo::isMoveInstr(const MachineInstr &MI,
- unsigned &SrcReg, unsigned &DstReg) const {
- unsigned oc = MI.getOpcode();
- switch (oc) {
- default:
- return false;
- case ARM::FCPYS:
- case ARM::FCPYD:
- SrcReg = MI.getOperand(1).getReg();
- DstReg = MI.getOperand(0).getReg();
- return true;
- case ARM::MOVr:
- case ARM::tMOVr:
- assert(MI.getDesc().getNumOperands() >= 2 &&
- MI.getOperand(0).isRegister() &&
- MI.getOperand(1).isRegister() &&
- "Invalid ARM MOV instruction");
- SrcReg = MI.getOperand(1).getReg();
- DstReg = MI.getOperand(0).getReg();
- return true;
- }
-}
-
-unsigned ARMInstrInfo::isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const{
- switch (MI->getOpcode()) {
- default: break;
- case ARM::LDR:
- if (MI->getOperand(1).isFrameIndex() &&
- MI->getOperand(2).isRegister() &&
- MI->getOperand(3).isImmediate() &&
- MI->getOperand(2).getReg() == 0 &&
- MI->getOperand(3).getImm() == 0) {
- FrameIndex = MI->getOperand(1).getIndex();
- return MI->getOperand(0).getReg();
- }
- break;
- case ARM::FLDD:
- case ARM::FLDS:
- if (MI->getOperand(1).isFrameIndex() &&
- MI->getOperand(2).isImmediate() &&
- MI->getOperand(2).getImm() == 0) {
- FrameIndex = MI->getOperand(1).getIndex();
- return MI->getOperand(0).getReg();
- }
- break;
- case ARM::tRestore:
- if (MI->getOperand(1).isFrameIndex() &&
- MI->getOperand(2).isImmediate() &&
- MI->getOperand(2).getImm() == 0) {
- FrameIndex = MI->getOperand(1).getIndex();
- return MI->getOperand(0).getReg();
- }
- break;
- }
- return 0;
-}
-
-unsigned ARMInstrInfo::isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const {
- switch (MI->getOpcode()) {
- default: break;
- case ARM::STR:
- if (MI->getOperand(1).isFrameIndex() &&
- MI->getOperand(2).isRegister() &&
- MI->getOperand(3).isImmediate() &&
- MI->getOperand(2).getReg() == 0 &&
- MI->getOperand(3).getImm() == 0) {
- FrameIndex = MI->getOperand(1).getIndex();
- return MI->getOperand(0).getReg();
- }
- break;
- case ARM::FSTD:
- case ARM::FSTS:
- if (MI->getOperand(1).isFrameIndex() &&
- MI->getOperand(2).isImmediate() &&
- MI->getOperand(2).getImm() == 0) {
- FrameIndex = MI->getOperand(1).getIndex();
- return MI->getOperand(0).getReg();
- }
- break;
- case ARM::tSpill:
- if (MI->getOperand(1).isFrameIndex() &&
- MI->getOperand(2).isImmediate() &&
- MI->getOperand(2).getImm() == 0) {
- FrameIndex = MI->getOperand(1).getIndex();
- return MI->getOperand(0).getReg();
- }
- break;
- }
- return 0;
-}
-
-void ARMInstrInfo::reMaterialize(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I,
- unsigned DestReg,
- const MachineInstr *Orig) const {
- if (Orig->getOpcode() == ARM::MOVi2pieces) {
- RI.emitLoadConstPool(MBB, I, DestReg, Orig->getOperand(1).getImm(),
- Orig->getOperand(2).getImm(),
- Orig->getOperand(3).getReg(), this, false);
- return;
+ : ARMBaseInstrInfo(STI), RI() {}
+
+/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
+void ARMInstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
+ if (hasNOP()) {
+ NopInst.setOpcode(ARM::HINT);
+ NopInst.addOperand(MCOperand::createImm(0));
+ NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
+ NopInst.addOperand(MCOperand::createReg(0));
+ } else {
+ NopInst.setOpcode(ARM::MOVr);
+ NopInst.addOperand(MCOperand::createReg(ARM::R0));
+ NopInst.addOperand(MCOperand::createReg(ARM::R0));
+ NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
+ NopInst.addOperand(MCOperand::createReg(0));
+ NopInst.addOperand(MCOperand::createReg(0));
}
-
- MachineInstr *MI = Orig->clone();
- MI->getOperand(0).setReg(DestReg);
- MBB.insert(I, MI);
}
-static unsigned getUnindexedOpcode(unsigned Opc) {
+unsigned ARMInstrInfo::getUnindexedOpcode(unsigned Opc) const {
switch (Opc) {
- default: break;
- case ARM::LDR_PRE:
- case ARM::LDR_POST:
- return ARM::LDR;
+ default:
+ break;
+ case ARM::LDR_PRE_IMM:
+ case ARM::LDR_PRE_REG:
+ case ARM::LDR_POST_IMM:
+ case ARM::LDR_POST_REG:
+ return ARM::LDRi12;
case ARM::LDRH_PRE:
case ARM::LDRH_POST:
return ARM::LDRH;
- case ARM::LDRB_PRE:
- case ARM::LDRB_POST:
- return ARM::LDRB;
+ case ARM::LDRB_PRE_IMM:
+ case ARM::LDRB_PRE_REG:
+ case ARM::LDRB_POST_IMM:
+ case ARM::LDRB_POST_REG:
+ return ARM::LDRBi12;
case ARM::LDRSH_PRE:
case ARM::LDRSH_POST:
return ARM::LDRSH;
case ARM::LDRSB_PRE:
case ARM::LDRSB_POST:
return ARM::LDRSB;
- case ARM::STR_PRE:
- case ARM::STR_POST:
- return ARM::STR;
+ case ARM::STR_PRE_IMM:
+ case ARM::STR_PRE_REG:
+ case ARM::STR_POST_IMM:
+ case ARM::STR_POST_REG:
+ return ARM::STRi12;
case ARM::STRH_PRE:
case ARM::STRH_POST:
return ARM::STRH;
- case ARM::STRB_PRE:
- case ARM::STRB_POST:
- return ARM::STRB;
- }
- return 0;
-}
-
-MachineInstr *
-ARMInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
- MachineBasicBlock::iterator &MBBI,
- LiveVariables *LV) const {
- if (!EnableARM3Addr)
- return NULL;
-
- MachineInstr *MI = MBBI;
- unsigned TSFlags = MI->getDesc().TSFlags;
- bool isPre = false;
- switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
- default: return NULL;
- case ARMII::IndexModePre:
- isPre = true;
- break;
- case ARMII::IndexModePost:
- break;
+ case ARM::STRB_PRE_IMM:
+ case ARM::STRB_PRE_REG:
+ case ARM::STRB_POST_IMM:
+ case ARM::STRB_POST_REG:
+ return ARM::STRBi12;
}
- // Try spliting an indexed load / store to a un-indexed one plus an add/sub
- // operation.
- unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
- if (MemOpc == 0)
- return NULL;
-
- MachineInstr *UpdateMI = NULL;
- MachineInstr *MemMI = NULL;
- unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
- const TargetInstrDesc &TID = MI->getDesc();
- unsigned NumOps = TID.getNumOperands();
- bool isLoad = !TID.mayStore();
- const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
- const MachineOperand &Base = MI->getOperand(2);
- const MachineOperand &Offset = MI->getOperand(NumOps-3);
- unsigned WBReg = WB.getReg();
- unsigned BaseReg = Base.getReg();
- unsigned OffReg = Offset.getReg();
- unsigned OffImm = MI->getOperand(NumOps-2).getImm();
- ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
- switch (AddrMode) {
- default:
- assert(false && "Unknown indexed op!");
- return NULL;
- case ARMII::AddrMode2: {
- bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
- unsigned Amt = ARM_AM::getAM2Offset(OffImm);
- if (OffReg == 0) {
- int SOImmVal = ARM_AM::getSOImmVal(Amt);
- if (SOImmVal == -1)
- // Can't encode it in a so_imm operand. This transformation will
- // add more than 1 instruction. Abandon!
- return NULL;
- UpdateMI = BuildMI(get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
- .addReg(BaseReg).addImm(SOImmVal)
- .addImm(Pred).addReg(0).addReg(0);
- } else if (Amt != 0) {
- ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
- unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
- UpdateMI = BuildMI(get(isSub ? ARM::SUBrs : ARM::ADDrs), WBReg)
- .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc)
- .addImm(Pred).addReg(0).addReg(0);
- } else
- UpdateMI = BuildMI(get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
- .addReg(BaseReg).addReg(OffReg)
- .addImm(Pred).addReg(0).addReg(0);
- break;
- }
- case ARMII::AddrMode3 : {
- bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
- unsigned Amt = ARM_AM::getAM3Offset(OffImm);
- if (OffReg == 0)
- // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
- UpdateMI = BuildMI(get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
- .addReg(BaseReg).addImm(Amt)
- .addImm(Pred).addReg(0).addReg(0);
- else
- UpdateMI = BuildMI(get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
- .addReg(BaseReg).addReg(OffReg)
- .addImm(Pred).addReg(0).addReg(0);
- break;
- }
- }
-
- std::vector<MachineInstr*> NewMIs;
- if (isPre) {
- if (isLoad)
- MemMI = BuildMI(get(MemOpc), MI->getOperand(0).getReg())
- .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
- else
- MemMI = BuildMI(get(MemOpc)).addReg(MI->getOperand(1).getReg())
- .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
- NewMIs.push_back(MemMI);
- NewMIs.push_back(UpdateMI);
- } else {
- if (isLoad)
- MemMI = BuildMI(get(MemOpc), MI->getOperand(0).getReg())
- .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
- else
- MemMI = BuildMI(get(MemOpc)).addReg(MI->getOperand(1).getReg())
- .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
- if (WB.isDead())
- UpdateMI->getOperand(0).setIsDead();
- NewMIs.push_back(UpdateMI);
- NewMIs.push_back(MemMI);
- }
-
- // Transfer LiveVariables states, kill / dead info.
- for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
- MachineOperand &MO = MI->getOperand(i);
- if (MO.isRegister() && MO.getReg() &&
- TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
- unsigned Reg = MO.getReg();
-
- if (LV) {
- LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
- if (MO.isDef()) {
- MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
- if (MO.isDead())
- LV->addVirtualRegisterDead(Reg, NewMI);
- }
- if (MO.isUse() && MO.isKill()) {
- for (unsigned j = 0; j < 2; ++j) {
- // Look at the two new MI's in reverse order.
- MachineInstr *NewMI = NewMIs[j];
- if (!NewMI->readsRegister(Reg))
- continue;
- LV->addVirtualRegisterKilled(Reg, NewMI);
- if (VI.removeKill(MI))
- VI.Kills.push_back(NewMI);
- break;
- }
- }
- }
- }
- }
-
- MFI->insert(MBBI, NewMIs[1]);
- MFI->insert(MBBI, NewMIs[0]);
- return NewMIs[0];
-}
-
-// Branch analysis.
-bool ARMInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
- MachineBasicBlock *&FBB,
- std::vector<MachineOperand> &Cond) const {
- // If the block has no terminators, it just falls into the block after it.
- MachineBasicBlock::iterator I = MBB.end();
- if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
- return false;
-
- // Get the last instruction in the block.
- MachineInstr *LastInst = I;
-
- // If there is only one terminator instruction, process it.
- unsigned LastOpc = LastInst->getOpcode();
- if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
- if (LastOpc == ARM::B || LastOpc == ARM::tB) {
- TBB = LastInst->getOperand(0).getMBB();
- return false;
- }
- if (LastOpc == ARM::Bcc || LastOpc == ARM::tBcc) {
- // Block ends with fall-through condbranch.
- TBB = LastInst->getOperand(0).getMBB();
- Cond.push_back(LastInst->getOperand(1));
- Cond.push_back(LastInst->getOperand(2));
- return false;
- }
- return true; // Can't handle indirect branch.
- }
-
- // Get the instruction before it if it is a terminator.
- MachineInstr *SecondLastInst = I;
-
- // If there are three terminators, we don't know what sort of block this is.
- if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
- return true;
-
- // If the block ends with ARM::B/ARM::tB and a ARM::Bcc/ARM::tBcc, handle it.
- unsigned SecondLastOpc = SecondLastInst->getOpcode();
- if ((SecondLastOpc == ARM::Bcc && LastOpc == ARM::B) ||
- (SecondLastOpc == ARM::tBcc && LastOpc == ARM::tB)) {
- TBB = SecondLastInst->getOperand(0).getMBB();
- Cond.push_back(SecondLastInst->getOperand(1));
- Cond.push_back(SecondLastInst->getOperand(2));
- FBB = LastInst->getOperand(0).getMBB();
- return false;
- }
-
- // If the block ends with two unconditional branches, handle it. The second
- // one is not executed, so remove it.
- if ((SecondLastOpc == ARM::B || SecondLastOpc==ARM::tB) &&
- (LastOpc == ARM::B || LastOpc == ARM::tB)) {
- TBB = SecondLastInst->getOperand(0).getMBB();
- I = LastInst;
- I->eraseFromParent();
- return false;
- }
-
- // Likewise if it ends with a branch table followed by an unconditional branch.
- // The branch folder can create these, and we must get rid of them for
- // correctness of Thumb constant islands.
- if ((SecondLastOpc == ARM::BR_JTr || SecondLastOpc==ARM::BR_JTm ||
- SecondLastOpc == ARM::BR_JTadd || SecondLastOpc==ARM::tBR_JTr) &&
- (LastOpc == ARM::B || LastOpc == ARM::tB)) {
- I = LastInst;
- I->eraseFromParent();
- return true;
- }
-
- // Otherwise, can't handle this.
- return true;
-}
-
-
-unsigned ARMInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- int BOpc = AFI->isThumbFunction() ? ARM::tB : ARM::B;
- int BccOpc = AFI->isThumbFunction() ? ARM::tBcc : ARM::Bcc;
-
- MachineBasicBlock::iterator I = MBB.end();
- if (I == MBB.begin()) return 0;
- --I;
- if (I->getOpcode() != BOpc && I->getOpcode() != BccOpc)
- return 0;
-
- // Remove the branch.
- I->eraseFromParent();
-
- I = MBB.end();
-
- if (I == MBB.begin()) return 1;
- --I;
- if (I->getOpcode() != BccOpc)
- return 1;
-
- // Remove the branch.
- I->eraseFromParent();
- return 2;
+ return 0;
}
-unsigned ARMInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
- MachineBasicBlock *FBB,
- const std::vector<MachineOperand> &Cond) const {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- int BOpc = AFI->isThumbFunction() ? ARM::tB : ARM::B;
- int BccOpc = AFI->isThumbFunction() ? ARM::tBcc : ARM::Bcc;
+void ARMInstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI,
+ Reloc::Model RM) const {
+ MachineFunction &MF = *MI->getParent()->getParent();
+ const ARMSubtarget &Subtarget = MF.getSubtarget<ARMSubtarget>();
- // Shouldn't be a fall through.
- assert(TBB && "InsertBranch must not be told to insert a fallthrough");
- assert((Cond.size() == 2 || Cond.size() == 0) &&
- "ARM branch conditions have two components!");
-
- if (FBB == 0) {
- if (Cond.empty()) // Unconditional branch?
- BuildMI(&MBB, get(BOpc)).addMBB(TBB);
+ if (!Subtarget.useMovt(MF)) {
+ if (RM == Reloc::PIC_)
+ expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_pcrel, ARM::LDRi12, RM);
else
- BuildMI(&MBB, get(BccOpc)).addMBB(TBB)
- .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
- return 1;
+ expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_abs, ARM::LDRi12, RM);
+ return;
}
-
- // Two-way conditional branch.
- BuildMI(&MBB, get(BccOpc)).addMBB(TBB)
- .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
- BuildMI(&MBB, get(BOpc)).addMBB(FBB);
- return 2;
-}
-void ARMInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I,
- unsigned DestReg, unsigned SrcReg,
- const TargetRegisterClass *DestRC,
- const TargetRegisterClass *SrcRC) const {
- if (DestRC != SrcRC) {
- cerr << "Not yet supported!";
- abort();
+ if (RM != Reloc::PIC_) {
+ expandLoadStackGuardBase(MI, ARM::MOVi32imm, ARM::LDRi12, RM);
+ return;
}
- if (DestRC == ARM::GPRRegisterClass) {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (AFI->isThumbFunction())
- BuildMI(MBB, I, get(ARM::tMOVr), DestReg).addReg(SrcReg);
- else
- AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, get(ARM::MOVr), DestReg)
- .addReg(SrcReg)));
- } else if (DestRC == ARM::SPRRegisterClass)
- AddDefaultPred(BuildMI(MBB, I, get(ARM::FCPYS), DestReg)
- .addReg(SrcReg));
- else if (DestRC == ARM::DPRRegisterClass)
- AddDefaultPred(BuildMI(MBB, I, get(ARM::FCPYD), DestReg)
- .addReg(SrcReg));
- else
- abort();
-}
-
-static const MachineInstrBuilder &ARMInstrAddOperand(MachineInstrBuilder &MIB,
- MachineOperand &MO) {
- if (MO.isRegister())
- MIB = MIB.addReg(MO.getReg(), MO.isDef(), MO.isImplicit());
- else if (MO.isImmediate())
- MIB = MIB.addImm(MO.getImm());
- else if (MO.isFrameIndex())
- MIB = MIB.addFrameIndex(MO.getIndex());
- else
- assert(0 && "Unknown operand for ARMInstrAddOperand!");
-
- return MIB;
-}
+ const GlobalValue *GV =
+ cast<GlobalValue>((*MI->memoperands_begin())->getValue());
-void ARMInstrInfo::
-storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned SrcReg, bool isKill, int FI,
- const TargetRegisterClass *RC) const {
- if (RC == ARM::GPRRegisterClass) {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (AFI->isThumbFunction())
- BuildMI(MBB, I, get(ARM::tSpill)).addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addImm(0);
- else
- AddDefaultPred(BuildMI(MBB, I, get(ARM::STR))
- .addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addReg(0).addImm(0));
- } else if (RC == ARM::DPRRegisterClass) {
- AddDefaultPred(BuildMI(MBB, I, get(ARM::FSTD))
- .addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addImm(0));
- } else {
- assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
- AddDefaultPred(BuildMI(MBB, I, get(ARM::FSTS))
- .addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addImm(0));
- }
-}
-
-void ARMInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
- bool isKill,
- SmallVectorImpl<MachineOperand> &Addr,
- const TargetRegisterClass *RC,
- SmallVectorImpl<MachineInstr*> &NewMIs) const {
- unsigned Opc = 0;
- if (RC == ARM::GPRRegisterClass) {
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (AFI->isThumbFunction()) {
- Opc = Addr[0].isFrameIndex() ? ARM::tSpill : ARM::tSTR;
- MachineInstrBuilder MIB =
- BuildMI(get(Opc)).addReg(SrcReg, false, false, isKill);
- for (unsigned i = 0, e = Addr.size(); i != e; ++i)
- MIB = ARMInstrAddOperand(MIB, Addr[i]);
- NewMIs.push_back(MIB);
- return;
- }
- Opc = ARM::STR;
- } else if (RC == ARM::DPRRegisterClass) {
- Opc = ARM::FSTD;
- } else {
- assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
- Opc = ARM::FSTS;
+ if (!Subtarget.GVIsIndirectSymbol(GV, RM)) {
+ expandLoadStackGuardBase(MI, ARM::MOV_ga_pcrel, ARM::LDRi12, RM);
+ return;
}
- MachineInstrBuilder MIB =
- BuildMI(get(Opc)).addReg(SrcReg, false, false, isKill);
- for (unsigned i = 0, e = Addr.size(); i != e; ++i)
- MIB = ARMInstrAddOperand(MIB, Addr[i]);
+ MachineBasicBlock &MBB = *MI->getParent();
+ DebugLoc DL = MI->getDebugLoc();
+ unsigned Reg = MI->getOperand(0).getReg();
+ MachineInstrBuilder MIB;
+
+ MIB = BuildMI(MBB, MI, DL, get(ARM::MOV_ga_pcrel_ldr), Reg)
+ .addGlobalAddress(GV, 0, ARMII::MO_NONLAZY);
+ unsigned Flag = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant;
+ MachineMemOperand *MMO = MBB.getParent()->getMachineMemOperand(
+ MachinePointerInfo::getGOT(*MBB.getParent()), Flag, 4, 4);
+ MIB.addMemOperand(MMO);
+ MIB = BuildMI(MBB, MI, DL, get(ARM::LDRi12), Reg);
+ MIB.addReg(Reg, RegState::Kill).addImm(0);
+ MIB.setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
AddDefaultPred(MIB);
- NewMIs.push_back(MIB);
- return;
}
-void ARMInstrInfo::
-loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned DestReg, int FI,
- const TargetRegisterClass *RC) const {
- if (RC == ARM::GPRRegisterClass) {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (AFI->isThumbFunction())
- BuildMI(MBB, I, get(ARM::tRestore), DestReg)
- .addFrameIndex(FI).addImm(0);
- else
- AddDefaultPred(BuildMI(MBB, I, get(ARM::LDR), DestReg)
- .addFrameIndex(FI).addReg(0).addImm(0));
- } else if (RC == ARM::DPRRegisterClass) {
- AddDefaultPred(BuildMI(MBB, I, get(ARM::FLDD), DestReg)
- .addFrameIndex(FI).addImm(0));
- } else {
- assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
- AddDefaultPred(BuildMI(MBB, I, get(ARM::FLDS), DestReg)
- .addFrameIndex(FI).addImm(0));
- }
-}
+namespace {
+/// ARMCGBR - Create Global Base Reg pass. This initializes the PIC
+/// global base register for ARM ELF.
+struct ARMCGBR : public MachineFunctionPass {
+ static char ID;
+ ARMCGBR() : MachineFunctionPass(ID) {}
-void ARMInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
- SmallVectorImpl<MachineOperand> &Addr,
- const TargetRegisterClass *RC,
- SmallVectorImpl<MachineInstr*> &NewMIs) const {
- unsigned Opc = 0;
- if (RC == ARM::GPRRegisterClass) {
+ bool runOnMachineFunction(MachineFunction &MF) override {
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (AFI->isThumbFunction()) {
- Opc = Addr[0].isFrameIndex() ? ARM::tRestore : ARM::tLDR;
- MachineInstrBuilder MIB = BuildMI(get(Opc), DestReg);
- for (unsigned i = 0, e = Addr.size(); i != e; ++i)
- MIB = ARMInstrAddOperand(MIB, Addr[i]);
- NewMIs.push_back(MIB);
- return;
- }
- Opc = ARM::LDR;
- } else if (RC == ARM::DPRRegisterClass) {
- Opc = ARM::FLDD;
- } else {
- assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
- Opc = ARM::FLDS;
- }
-
- MachineInstrBuilder MIB = BuildMI(get(Opc), DestReg);
- for (unsigned i = 0, e = Addr.size(); i != e; ++i)
- MIB = ARMInstrAddOperand(MIB, Addr[i]);
- AddDefaultPred(MIB);
- NewMIs.push_back(MIB);
- return;
-}
-
-bool ARMInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- const std::vector<CalleeSavedInfo> &CSI) const {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (!AFI->isThumbFunction() || CSI.empty())
- return false;
-
- MachineInstrBuilder MIB = BuildMI(MBB, MI, 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, false/*isDef*/,false/*isImp*/,true/*isKill*/);
- }
- return true;
-}
-
-bool ARMInstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- const std::vector<CalleeSavedInfo> &CSI) const {
- MachineFunction &MF = *MBB.getParent();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (!AFI->isThumbFunction() || CSI.empty())
- return false;
-
- bool isVarArg = AFI->getVarArgsRegSaveSize() > 0;
- MachineInstr *PopMI = new MachineInstr(get(ARM::tPOP));
- MBB.insert(MI, PopMI);
- 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));
- MBB.erase(MI);
- }
- PopMI->addOperand(MachineOperand::CreateReg(Reg, true));
- }
- return true;
-}
-
-MachineInstr *ARMInstrInfo::foldMemoryOperand(MachineFunction &MF,
- MachineInstr *MI,
- 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::MOVr: {
- if (MI->getOperand(4).getReg() == ARM::CPSR)
- // If it is updating CPSR, then it cannot be foled.
- break;
- unsigned Pred = MI->getOperand(2).getImm();
- unsigned PredReg = MI->getOperand(3).getReg();
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- bool isKill = MI->getOperand(1).isKill();
- NewMI = BuildMI(get(ARM::STR)).addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- bool isDead = MI->getOperand(0).isDead();
- NewMI = BuildMI(get(ARM::LDR)).addReg(DstReg, true, false, false, isDead)
- .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
- }
- break;
- }
- case ARM::tMOVr: {
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- bool isKill = MI->getOperand(1).isKill();
- if (RI.isPhysicalRegister(SrcReg) && !RI.isLowRegister(SrcReg))
- // tSpill cannot take a high register operand.
- break;
- NewMI = BuildMI(get(ARM::tSpill)).addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addImm(0);
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- if (RI.isPhysicalRegister(DstReg) && !RI.isLowRegister(DstReg))
- // tRestore cannot target a high register operand.
- break;
- bool isDead = MI->getOperand(0).isDead();
- NewMI = BuildMI(get(ARM::tRestore))
- .addReg(DstReg, true, false, false, isDead)
- .addFrameIndex(FI).addImm(0);
- }
- break;
- }
- case ARM::FCPYS: {
- unsigned Pred = MI->getOperand(2).getImm();
- unsigned PredReg = MI->getOperand(3).getReg();
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- NewMI = BuildMI(get(ARM::FSTS)).addReg(SrcReg).addFrameIndex(FI)
- .addImm(0).addImm(Pred).addReg(PredReg);
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- NewMI = BuildMI(get(ARM::FLDS), DstReg).addFrameIndex(FI)
- .addImm(0).addImm(Pred).addReg(PredReg);
- }
- break;
- }
- case ARM::FCPYD: {
- unsigned Pred = MI->getOperand(2).getImm();
- unsigned PredReg = MI->getOperand(3).getReg();
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- bool isKill = MI->getOperand(1).isKill();
- NewMI = BuildMI(get(ARM::FSTD)).addReg(SrcReg, false, false, isKill)
- .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- bool isDead = MI->getOperand(0).isDead();
- NewMI = BuildMI(get(ARM::FLDD)).addReg(DstReg, true, false, false, isDead)
- .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
- }
- break;
- }
- }
-
- return NewMI;
-}
-
-bool ARMInstrInfo::canFoldMemoryOperand(MachineInstr *MI,
- SmallVectorImpl<unsigned> &Ops) const {
- if (Ops.size() != 1) return false;
-
- unsigned OpNum = Ops[0];
- unsigned Opc = MI->getOpcode();
- switch (Opc) {
- default: break;
- case ARM::MOVr:
- // If it is updating CPSR, then it cannot be foled.
- return MI->getOperand(4).getReg() != ARM::CPSR;
- case ARM::tMOVr: {
- if (OpNum == 0) { // move -> store
- unsigned SrcReg = MI->getOperand(1).getReg();
- if (RI.isPhysicalRegister(SrcReg) && !RI.isLowRegister(SrcReg))
- // tSpill cannot take a high register operand.
- return false;
- } else { // move -> load
- unsigned DstReg = MI->getOperand(0).getReg();
- if (RI.isPhysicalRegister(DstReg) && !RI.isLowRegister(DstReg))
- // tRestore cannot target a high register operand.
- return false;
- }
- return true;
- }
- case ARM::FCPYS:
- case ARM::FCPYD:
- return true;
- }
-
- return false;
-}
-
-bool ARMInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
- if (MBB.empty()) return false;
-
- switch (MBB.back().getOpcode()) {
- case ARM::BX_RET: // Return.
- case ARM::LDM_RET:
- case ARM::tBX_RET:
- case ARM::tBX_RET_vararg:
- case ARM::tPOP_RET:
- case ARM::B:
- case ARM::tB: // Uncond branch.
- case ARM::tBR_JTr:
- case ARM::BR_JTr: // Jumptable branch.
- case ARM::BR_JTm: // Jumptable branch through mem.
- case ARM::BR_JTadd: // Jumptable branch add to pc.
- return true;
- default: return false;
- }
-}
-
-bool ARMInstrInfo::
-ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
- ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
- Cond[0].setImm(ARMCC::getOppositeCondition(CC));
- return false;
-}
+ if (AFI->getGlobalBaseReg() == 0)
+ return false;
+ const ARMSubtarget &STI =
+ static_cast<const ARMSubtarget &>(MF.getSubtarget());
+ // Don't do this for Thumb1.
+ if (STI.isThumb1Only())
+ return false;
-bool ARMInstrInfo::isPredicated(const MachineInstr *MI) const {
- int PIdx = MI->findFirstPredOperandIdx();
- return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL;
-}
+ const TargetMachine &TM = MF.getTarget();
+ if (TM.getRelocationModel() != Reloc::PIC_)
+ return false;
-bool ARMInstrInfo::PredicateInstruction(MachineInstr *MI,
- const std::vector<MachineOperand> &Pred) const {
- unsigned Opc = MI->getOpcode();
- if (Opc == ARM::B || Opc == ARM::tB) {
- MI->setDesc(get(Opc == ARM::B ? ARM::Bcc : ARM::tBcc));
- MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
- MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
- return true;
- }
+ LLVMContext *Context = &MF.getFunction()->getContext();
+ unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
+ unsigned PCAdj = STI.isThumb() ? 4 : 8;
+ ARMConstantPoolValue *CPV = ARMConstantPoolSymbol::Create(
+ *Context, "_GLOBAL_OFFSET_TABLE_", ARMPCLabelIndex, PCAdj);
+
+ unsigned Align =
+ MF.getDataLayout().getPrefTypeAlignment(Type::getInt32PtrTy(*Context));
+ unsigned Idx = MF.getConstantPool()->getConstantPoolIndex(CPV, Align);
+
+ MachineBasicBlock &FirstMBB = MF.front();
+ MachineBasicBlock::iterator MBBI = FirstMBB.begin();
+ DebugLoc DL = FirstMBB.findDebugLoc(MBBI);
+ unsigned TempReg =
+ MF.getRegInfo().createVirtualRegister(&ARM::rGPRRegClass);
+ unsigned Opc = STI.isThumb2() ? ARM::t2LDRpci : ARM::LDRcp;
+ const TargetInstrInfo &TII = *STI.getInstrInfo();
+ MachineInstrBuilder MIB = BuildMI(FirstMBB, MBBI, DL, TII.get(Opc), TempReg)
+ .addConstantPoolIndex(Idx);
+ if (Opc == ARM::LDRcp)
+ MIB.addImm(0);
+ AddDefaultPred(MIB);
+
+ // Fix the GOT address by adding pc.
+ unsigned GlobalBaseReg = AFI->getGlobalBaseReg();
+ Opc = STI.isThumb2() ? ARM::tPICADD : ARM::PICADD;
+ MIB = BuildMI(FirstMBB, MBBI, DL, TII.get(Opc), GlobalBaseReg)
+ .addReg(TempReg)
+ .addImm(ARMPCLabelIndex);
+ if (Opc == ARM::PICADD)
+ AddDefaultPred(MIB);
- int PIdx = MI->findFirstPredOperandIdx();
- if (PIdx != -1) {
- MachineOperand &PMO = MI->getOperand(PIdx);
- PMO.setImm(Pred[0].getImm());
- MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
return true;
}
- return false;
-}
-
-bool
-ARMInstrInfo::SubsumesPredicate(const std::vector<MachineOperand> &Pred1,
- const std::vector<MachineOperand> &Pred2) const{
- if (Pred1.size() > 2 || Pred2.size() > 2)
- return false;
-
- ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
- ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
- if (CC1 == CC2)
- return true;
- switch (CC1) {
- default:
- return false;
- case ARMCC::AL:
- return true;
- case ARMCC::HS:
- return CC2 == ARMCC::HI;
- case ARMCC::LS:
- return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
- case ARMCC::GE:
- return CC2 == ARMCC::GT;
- case ARMCC::LE:
- return CC2 == ARMCC::LT;
+ const char *getPassName() const override {
+ return "ARM PIC Global Base Reg Initialization";
}
-}
-
-bool ARMInstrInfo::DefinesPredicate(MachineInstr *MI,
- std::vector<MachineOperand> &Pred) const {
- const TargetInstrDesc &TID = MI->getDesc();
- if (!TID.getImplicitDefs() && !TID.hasOptionalDef())
- return false;
- bool Found = false;
- for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
- const MachineOperand &MO = MI->getOperand(i);
- if (MO.isRegister() && MO.getReg() == ARM::CPSR) {
- Pred.push_back(MO);
- Found = true;
- }
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.setPreservesCFG();
+ MachineFunctionPass::getAnalysisUsage(AU);
}
-
- return Found;
+};
}
-
-/// FIXME: Works around a gcc miscompilation with -fstrict-aliasing
-static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
- unsigned JTI) DISABLE_INLINE;
-static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
- unsigned JTI) {
- return JT[JTI].MBBs.size();
-}
-
-/// GetInstSize - Return the size of the specified MachineInstr.
-///
-unsigned ARMInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
- const MachineBasicBlock &MBB = *MI->getParent();
- const MachineFunction *MF = MBB.getParent();
- const TargetAsmInfo *TAI = MF->getTarget().getTargetAsmInfo();
-
- // Basic size info comes from the TSFlags field.
- const TargetInstrDesc &TID = MI->getDesc();
- unsigned TSFlags = TID.TSFlags;
-
- switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
- default:
- // If this machine instr is an inline asm, measure it.
- if (MI->getOpcode() == ARM::INLINEASM)
- return TAI->getInlineAsmLength(MI->getOperand(0).getSymbolName());
- if (MI->isLabel())
- return 0;
- if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF)
- return 0;
- assert(0 && "Unknown or unset size field for instr!");
- break;
- case ARMII::Size8Bytes: return 8; // Arm instruction x 2.
- case ARMII::Size4Bytes: return 4; // Arm instruction.
- case ARMII::Size2Bytes: return 2; // Thumb instruction.
- case ARMII::SizeSpecial: {
- switch (MI->getOpcode()) {
- case ARM::CONSTPOOL_ENTRY:
- // If this machine instr is a constant pool entry, its size is recorded as
- // operand #2.
- return MI->getOperand(2).getImm();
- case ARM::BR_JTr:
- case ARM::BR_JTm:
- case ARM::BR_JTadd:
- case ARM::tBR_JTr: {
- // These are jumptable branches, i.e. a branch followed by an inlined
- // jumptable. The size is 4 + 4 * number of entries.
- unsigned NumOps = TID.getNumOperands();
- MachineOperand JTOP =
- MI->getOperand(NumOps - (TID.isPredicable() ? 3 : 2));
- unsigned JTI = JTOP.getIndex();
- MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
- const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
- assert(JTI < JT.size());
- // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
- // 4 aligned. The assembler / linker may add 2 byte padding just before
- // the JT entries. The size does not include this padding; the
- // constant islands pass does separate bookkeeping for it.
- // FIXME: If we know the size of the function is less than (1 << 16) *2
- // bytes, we can use 16-bit entries instead. Then there won't be an
- // alignment issue.
- return getNumJTEntries(JT, JTI) * 4 +
- (MI->getOpcode()==ARM::tBR_JTr ? 2 : 4);
- }
- default:
- // Otherwise, pseudo-instruction sizes are zero.
- return 0;
- }
- }
- }
- return 0; // Not reached
-}
+char ARMCGBR::ID = 0;
+FunctionPass *llvm::createARMGlobalBaseRegPass() { return new ARMCGBR(); }
projects / oota-llvm.git / blobdiff