diff options
Diffstat (limited to 'lib/Target/ARM/ARMInstrInfo.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMInstrInfo.cpp | 699 |
1 files changed, 365 insertions, 334 deletions
diff --git a/lib/Target/ARM/ARMInstrInfo.cpp b/lib/Target/ARM/ARMInstrInfo.cpp index d95089d..443fdc7 100644 --- a/lib/Target/ARM/ARMInstrInfo.cpp +++ b/lib/Target/ARM/ARMInstrInfo.cpp @@ -40,108 +40,24 @@ const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) { } ARMBaseInstrInfo::ARMBaseInstrInfo(const ARMSubtarget &STI) - : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)), - RI(*this, STI) { + : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)) { } ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI) - : ARMBaseInstrInfo(STI) { + : ARMBaseInstrInfo(STI), RI(*this, STI) { } -/// 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, - unsigned& SrcSubIdx, unsigned& DstSubIdx) const { - SrcSubIdx = DstSubIdx = 0; // No sub-registers. - - unsigned oc = MI.getOpcode(); - switch (oc) { - default: - return false; - case ARM::FCPYS: - case ARM::FCPYD: - case ARM::VMOVD: - case ARM::VMOVQ: - SrcReg = MI.getOperand(1).getReg(); - DstReg = MI.getOperand(0).getReg(); - return true; - case ARM::MOVr: - assert(MI.getDesc().getNumOperands() >= 2 && - MI.getOperand(0).isReg() && - MI.getOperand(1).isReg() && - "Invalid ARM MOV instruction"); - SrcReg = MI.getOperand(1).getReg(); - DstReg = MI.getOperand(0).getReg(); - return true; - } -} - -unsigned ARMInstrInfo::isLoadFromStackSlot(const MachineInstr *MI, - int &FrameIndex) const { - switch (MI->getOpcode()) { - default: break; - case ARM::LDR: - if (MI->getOperand(1).isFI() && - MI->getOperand(2).isReg() && - MI->getOperand(3).isImm() && - 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).isFI() && - MI->getOperand(2).isImm() && - MI->getOperand(2).getImm() == 0) { - FrameIndex = MI->getOperand(1).getIndex(); - return MI->getOperand(0).getReg(); - } - break; - } - return 0; -} - -unsigned ARMInstrInfo::isStoreToStackSlot(const MachineInstr *MI, - int &FrameIndex) const { - switch (MI->getOpcode()) { - default: break; - case ARM::STR: - if (MI->getOperand(1).isFI() && - MI->getOperand(2).isReg() && - MI->getOperand(3).isImm() && - 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).isFI() && - MI->getOperand(2).isImm() && - MI->getOperand(2).getImm() == 0) { - FrameIndex = MI->getOperand(1).getIndex(); - return MI->getOperand(0).getReg(); - } - break; - } - - return 0; -} - -void ARMBaseInstrInfo::reMaterialize(MachineBasicBlock &MBB, - MachineBasicBlock::iterator I, - unsigned DestReg, - const MachineInstr *Orig) const { +void ARMInstrInfo::reMaterialize(MachineBasicBlock &MBB, + MachineBasicBlock::iterator I, + unsigned DestReg, + const MachineInstr *Orig) const { DebugLoc dl = Orig->getDebugLoc(); if (Orig->getOpcode() == ARM::MOVi2pieces) { - RI.emitLoadConstPool(MBB, I, DestReg, Orig->getOperand(1).getImm(), - Orig->getOperand(2).getImm(), - Orig->getOperand(3).getReg(), this, false, dl); + RI.emitLoadConstPool(MBB, I, this, dl, + DestReg, + Orig->getOperand(1).getImm(), + (ARMCC::CondCodes)Orig->getOperand(2).getImm(), + Orig->getOperand(3).getReg()); return; } @@ -334,10 +250,10 @@ ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, // Branch analysis. bool - ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, - MachineBasicBlock *&FBB, - SmallVectorImpl<MachineOperand> &Cond, - bool AllowModify) const { +ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, + MachineBasicBlock *&FBB, + SmallVectorImpl<MachineOperand> &Cond, + bool AllowModify) 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)) @@ -349,11 +265,11 @@ bool // 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) { + if (LastOpc == ARM::B || LastOpc == ARM::tB || LastOpc == ARM::t2B) { TBB = LastInst->getOperand(0).getMBB(); return false; } - if (LastOpc == ARM::Bcc || LastOpc == ARM::tBcc) { + if (LastOpc == ARM::Bcc || LastOpc == ARM::tBcc || LastOpc == ARM::t2Bcc) { // Block ends with fall-through condbranch. TBB = LastInst->getOperand(0).getMBB(); Cond.push_back(LastInst->getOperand(1)); @@ -370,10 +286,12 @@ bool 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. + // If the block ends with ARM::B/ARM::tB/ARM::t2B and a + // ARM::Bcc/ARM::tBcc/ARM::t2Bcc, handle it. unsigned SecondLastOpc = SecondLastInst->getOpcode(); if ((SecondLastOpc == ARM::Bcc && LastOpc == ARM::B) || - (SecondLastOpc == ARM::tBcc && LastOpc == ARM::tB)) { + (SecondLastOpc == ARM::tBcc && LastOpc == ARM::tB) || + (SecondLastOpc == ARM::t2Bcc && LastOpc == ARM::t2B)) { TBB = SecondLastInst->getOperand(0).getMBB(); Cond.push_back(SecondLastInst->getOperand(1)); Cond.push_back(SecondLastInst->getOperand(2)); @@ -383,8 +301,9 @@ bool // 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)) { + if ((SecondLastOpc == ARM::B || SecondLastOpc==ARM::tB || + SecondLastOpc==ARM::t2B) && + (LastOpc == ARM::B || LastOpc == ARM::tB || LastOpc == ARM::t2B)) { TBB = SecondLastInst->getOperand(0).getMBB(); I = LastInst; if (AllowModify) @@ -396,8 +315,10 @@ bool // 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)) { + SecondLastOpc == ARM::BR_JTadd || SecondLastOpc==ARM::tBR_JTr || + SecondLastOpc == ARM::t2BR_JTr || SecondLastOpc==ARM::t2BR_JTm || + SecondLastOpc == ARM::t2BR_JTadd) && + (LastOpc == ARM::B || LastOpc == ARM::tB || LastOpc == ARM::t2B)) { I = LastInst; if (AllowModify) I->eraseFromParent(); @@ -412,8 +333,10 @@ bool unsigned ARMBaseInstrInfo::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; + int BOpc = AFI->isThumbFunction() ? + (AFI->isThumb2Function() ? ARM::t2B : ARM::tB) : ARM::B; + int BccOpc = AFI->isThumbFunction() ? + (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc) : ARM::Bcc; MachineBasicBlock::iterator I = MBB.end(); if (I == MBB.begin()) return 0; @@ -444,8 +367,10 @@ ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, DebugLoc dl = DebugLoc::getUnknownLoc(); 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; + int BOpc = AFI->isThumbFunction() ? + (AFI->isThumb2Function() ? ARM::t2B : ARM::tB) : ARM::B; + int BccOpc = AFI->isThumbFunction() ? + (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc) : ARM::Bcc; // Shouldn't be a fall through. assert(TBB && "InsertBranch must not be told to insert a fallthrough"); @@ -468,11 +393,288 @@ ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, return 2; } -bool ARMInstrInfo::copyRegToReg(MachineBasicBlock &MBB, - MachineBasicBlock::iterator I, - unsigned DestReg, unsigned SrcReg, - const TargetRegisterClass *DestRC, - const TargetRegisterClass *SrcRC) const { +bool +ARMBaseInstrInfo::BlockHasNoFallThrough(const 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: + case ARM::t2B: // Uncond branch. + case ARM::tBR_JTr: + case ARM::t2BR_JTr: + case ARM::BR_JTr: // Jumptable branch. + case ARM::t2BR_JTm: + case ARM::BR_JTm: // Jumptable branch through mem. + case ARM::t2BR_JTadd: + case ARM::BR_JTadd: // Jumptable branch add to pc. + return true; + default: return false; + } +} + +bool ARMBaseInstrInfo:: +ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const { + ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm(); + Cond[0].setImm(ARMCC::getOppositeCondition(CC)); + return false; +} + +bool ARMBaseInstrInfo::isPredicated(const MachineInstr *MI) const { + int PIdx = MI->findFirstPredOperandIdx(); + return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL; +} + +bool ARMBaseInstrInfo:: +PredicateInstruction(MachineInstr *MI, + const SmallVectorImpl<MachineOperand> &Pred) const { + unsigned Opc = MI->getOpcode(); + if (Opc == ARM::B || Opc == ARM::tB || Opc == ARM::t2B) { + MI->setDesc(get((Opc == ARM::B) ? ARM::Bcc : + ((Opc == ARM::tB) ? ARM::tBcc : ARM::t2Bcc))); + MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm())); + MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false)); + return true; + } + + 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 ARMBaseInstrInfo:: +SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1, + const SmallVectorImpl<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; + } +} + +bool ARMBaseInstrInfo::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.isReg() && MO.getReg() == ARM::CPSR) { + Pred.push_back(MO); + Found = true; + } + } + + 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 ARMBaseInstrInfo::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; + switch (MI->getOpcode()) { + default: + assert(0 && "Unknown or unset size field for instr!"); + break; + case TargetInstrInfo::IMPLICIT_DEF: + case TargetInstrInfo::DECLARE: + case TargetInstrInfo::DBG_LABEL: + case TargetInstrInfo::EH_LABEL: + return 0; + } + 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::Int_eh_sjlj_setjmp: return 12; + case ARM::BR_JTr: + case ARM::BR_JTm: + case ARM::BR_JTadd: + case ARM::t2BR_JTr: + case ARM::t2BR_JTm: + case ARM::t2BR_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(); + const 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 +} + +/// Return true if the instruction is a register to register move and +/// leave the source and dest operands in the passed parameters. +/// +bool +ARMBaseInstrInfo::isMoveInstr(const MachineInstr &MI, + unsigned &SrcReg, unsigned &DstReg, + unsigned& SrcSubIdx, unsigned& DstSubIdx) const { + SrcSubIdx = DstSubIdx = 0; // No sub-registers. + + unsigned oc = MI.getOpcode(); + switch (oc) { + default: + return false; + case ARM::FCPYS: + case ARM::FCPYD: + case ARM::VMOVD: + case ARM::VMOVQ: + SrcReg = MI.getOperand(1).getReg(); + DstReg = MI.getOperand(0).getReg(); + return true; + case ARM::MOVr: + assert(MI.getDesc().getNumOperands() >= 2 && + MI.getOperand(0).isReg() && + MI.getOperand(1).isReg() && + "Invalid ARM MOV instruction"); + SrcReg = MI.getOperand(1).getReg(); + DstReg = MI.getOperand(0).getReg(); + return true; + } +} + +unsigned +ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case ARM::LDR: + if (MI->getOperand(1).isFI() && + MI->getOperand(2).isReg() && + MI->getOperand(3).isImm() && + 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).isFI() && + MI->getOperand(2).isImm() && + MI->getOperand(2).getImm() == 0) { + FrameIndex = MI->getOperand(1).getIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + return 0; +} + +unsigned +ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case ARM::STR: + if (MI->getOperand(1).isFI() && + MI->getOperand(2).isReg() && + MI->getOperand(3).isImm() && + 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).isFI() && + MI->getOperand(2).isImm() && + MI->getOperand(2).getImm() == 0) { + FrameIndex = MI->getOperand(1).getIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + + return 0; +} + +bool +ARMBaseInstrInfo::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(); @@ -498,7 +700,7 @@ bool ARMInstrInfo::copyRegToReg(MachineBasicBlock &MBB, return true; } -void ARMInstrInfo:: +void ARMBaseInstrInfo:: storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, unsigned SrcReg, bool isKill, int FI, const TargetRegisterClass *RC) const { @@ -521,11 +723,12 @@ storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, } } -void ARMInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg, - bool isKill, - SmallVectorImpl<MachineOperand> &Addr, - const TargetRegisterClass *RC, - SmallVectorImpl<MachineInstr*> &NewMIs) const{ +void +ARMBaseInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg, + bool isKill, + SmallVectorImpl<MachineOperand> &Addr, + const TargetRegisterClass *RC, + SmallVectorImpl<MachineInstr*> &NewMIs) const{ DebugLoc DL = DebugLoc::getUnknownLoc(); unsigned Opc = 0; if (RC == ARM::GPRRegisterClass) { @@ -546,7 +749,7 @@ void ARMInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg, return; } -void ARMInstrInfo:: +void ARMBaseInstrInfo:: loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, unsigned DestReg, int FI, const TargetRegisterClass *RC) const { @@ -566,7 +769,7 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, } } -void ARMInstrInfo:: +void ARMBaseInstrInfo:: loadRegFromAddr(MachineFunction &MF, unsigned DestReg, SmallVectorImpl<MachineOperand> &Addr, const TargetRegisterClass *RC, @@ -590,7 +793,7 @@ loadRegFromAddr(MachineFunction &MF, unsigned DestReg, return; } -MachineInstr *ARMInstrInfo:: +MachineInstr *ARMBaseInstrInfo:: foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, const SmallVectorImpl<unsigned> &Ops, int FI) const { if (Ops.size() != 1) return NULL; @@ -609,14 +812,19 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, if (OpNum == 0) { // move -> store unsigned SrcReg = MI->getOperand(1).getReg(); bool isKill = MI->getOperand(1).isKill(); + bool isUndef = MI->getOperand(1).isUndef(); NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::STR)) - .addReg(SrcReg, getKillRegState(isKill)) + .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef)) .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(); + bool isUndef = MI->getOperand(0).isUndef(); NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::LDR)) - .addReg(DstReg, RegState::Define | getDeadRegState(isDead)) + .addReg(DstReg, + RegState::Define | + getDeadRegState(isDead) | + getUndefRegState(isUndef)) .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg); } break; @@ -626,14 +834,22 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, unsigned PredReg = MI->getOperand(3).getReg(); if (OpNum == 0) { // move -> store unsigned SrcReg = MI->getOperand(1).getReg(); + bool isKill = MI->getOperand(1).isKill(); + bool isUndef = MI->getOperand(1).isUndef(); NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTS)) - .addReg(SrcReg).addFrameIndex(FI) + .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef)) + .addFrameIndex(FI) .addImm(0).addImm(Pred).addReg(PredReg); } else { // move -> load unsigned DstReg = MI->getOperand(0).getReg(); - NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS), DstReg) - .addFrameIndex(FI) - .addImm(0).addImm(Pred).addReg(PredReg); + bool isDead = MI->getOperand(0).isDead(); + bool isUndef = MI->getOperand(0).isUndef(); + NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS)) + .addReg(DstReg, + RegState::Define | + getDeadRegState(isDead) | + getUndefRegState(isUndef)) + .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg); } break; } @@ -643,14 +859,19 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, if (OpNum == 0) { // move -> store unsigned SrcReg = MI->getOperand(1).getReg(); bool isKill = MI->getOperand(1).isKill(); + bool isUndef = MI->getOperand(1).isUndef(); NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTD)) - .addReg(SrcReg, getKillRegState(isKill)) + .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef)) .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg); } else { // move -> load unsigned DstReg = MI->getOperand(0).getReg(); bool isDead = MI->getOperand(0).isDead(); + bool isUndef = MI->getOperand(0).isUndef(); NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDD)) - .addReg(DstReg, RegState::Define | getDeadRegState(isDead)) + .addReg(DstReg, + RegState::Define | + getDeadRegState(isDead) | + getUndefRegState(isUndef)) .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg); } break; @@ -660,35 +881,25 @@ foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI, return NewMI; } -bool ARMBaseInstrInfo:: -canFoldMemoryOperand(const MachineInstr *MI, - const SmallVectorImpl<unsigned> &Ops) const { +MachineInstr* +ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF, + MachineInstr* MI, + const SmallVectorImpl<unsigned> &Ops, + MachineInstr* LoadMI) const { + return 0; +} + +bool +ARMBaseInstrInfo::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::MOVr: // If it is updating CPSR, then it cannot be folded. return MI->getOperand(4).getReg() != ARM::CPSR; - case ARM::tMOVr: - case ARM::tMOVlor2hir: - case ARM::tMOVhir2lor: - case ARM::tMOVhir2hir: { - 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; @@ -700,183 +911,3 @@ canFoldMemoryOperand(const MachineInstr *MI, return false; } - -bool - ARMBaseInstrInfo::BlockHasNoFallThrough(const 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 ARMBaseInstrInfo:: -ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const { - ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm(); - Cond[0].setImm(ARMCC::getOppositeCondition(CC)); - return false; -} - -bool ARMBaseInstrInfo::isPredicated(const MachineInstr *MI) const { - int PIdx = MI->findFirstPredOperandIdx(); - return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL; -} - -bool ARMBaseInstrInfo:: -PredicateInstruction(MachineInstr *MI, - const SmallVectorImpl<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; - } - - 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 ARMBaseInstrInfo:: -SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1, - const SmallVectorImpl<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; - } -} - -bool ARMBaseInstrInfo::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.isReg() && MO.getReg() == ARM::CPSR) { - Pred.push_back(MO); - Found = true; - } - } - - 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 ARMBaseInstrInfo::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; - switch (MI->getOpcode()) { - default: - assert(0 && "Unknown or unset size field for instr!"); - break; - case TargetInstrInfo::IMPLICIT_DEF: - case TargetInstrInfo::DECLARE: - case TargetInstrInfo::DBG_LABEL: - case TargetInstrInfo::EH_LABEL: - return 0; - } - 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::Int_eh_sjlj_setjmp: return 12; - 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(); - const 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 -} |
