diff options
Diffstat (limited to 'contrib/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp | 2830 |
1 files changed, 2830 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp b/contrib/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp new file mode 100644 index 0000000..408edfc --- /dev/null +++ b/contrib/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp @@ -0,0 +1,2830 @@ +//===- ARMBaseInstrInfo.cpp - ARM Instruction Information -------*- 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 the Base ARM implementation of the TargetInstrInfo class. +// +//===----------------------------------------------------------------------===// + +#include "ARMBaseInstrInfo.h" +#include "ARM.h" +#include "ARMConstantPoolValue.h" +#include "ARMHazardRecognizer.h" +#include "ARMMachineFunctionInfo.h" +#include "ARMRegisterInfo.h" +#include "MCTargetDesc/ARMAddressingModes.h" +#include "llvm/Constants.h" +#include "llvm/Function.h" +#include "llvm/GlobalValue.h" +#include "llvm/CodeGen/LiveVariables.h" +#include "llvm/CodeGen/MachineConstantPool.h" +#include "llvm/CodeGen/MachineFrameInfo.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/MachineJumpTableInfo.h" +#include "llvm/CodeGen/MachineMemOperand.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/CodeGen/PseudoSourceValue.h" +#include "llvm/CodeGen/SelectionDAGNodes.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/Support/BranchProbability.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/ADT/STLExtras.h" + +#define GET_INSTRINFO_CTOR +#include "ARMGenInstrInfo.inc" + +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 cl::opt<bool> +WidenVMOVS("widen-vmovs", cl::Hidden, + cl::desc("Widen ARM vmovs to vmovd when possible")); + +/// ARM_MLxEntry - Record information about MLA / MLS instructions. +struct ARM_MLxEntry { + unsigned MLxOpc; // MLA / MLS opcode + unsigned MulOpc; // Expanded multiplication opcode + unsigned AddSubOpc; // Expanded add / sub opcode + bool NegAcc; // True if the acc is negated before the add / sub. + bool HasLane; // True if instruction has an extra "lane" operand. +}; + +static const ARM_MLxEntry ARM_MLxTable[] = { + // MLxOpc, MulOpc, AddSubOpc, NegAcc, HasLane + // fp scalar ops + { ARM::VMLAS, ARM::VMULS, ARM::VADDS, false, false }, + { ARM::VMLSS, ARM::VMULS, ARM::VSUBS, false, false }, + { ARM::VMLAD, ARM::VMULD, ARM::VADDD, false, false }, + { ARM::VMLSD, ARM::VMULD, ARM::VSUBD, false, false }, + { ARM::VNMLAS, ARM::VNMULS, ARM::VSUBS, true, false }, + { ARM::VNMLSS, ARM::VMULS, ARM::VSUBS, true, false }, + { ARM::VNMLAD, ARM::VNMULD, ARM::VSUBD, true, false }, + { ARM::VNMLSD, ARM::VMULD, ARM::VSUBD, true, false }, + + // fp SIMD ops + { ARM::VMLAfd, ARM::VMULfd, ARM::VADDfd, false, false }, + { ARM::VMLSfd, ARM::VMULfd, ARM::VSUBfd, false, false }, + { ARM::VMLAfq, ARM::VMULfq, ARM::VADDfq, false, false }, + { ARM::VMLSfq, ARM::VMULfq, ARM::VSUBfq, false, false }, + { ARM::VMLAslfd, ARM::VMULslfd, ARM::VADDfd, false, true }, + { ARM::VMLSslfd, ARM::VMULslfd, ARM::VSUBfd, false, true }, + { ARM::VMLAslfq, ARM::VMULslfq, ARM::VADDfq, false, true }, + { ARM::VMLSslfq, ARM::VMULslfq, ARM::VSUBfq, false, true }, +}; + +ARMBaseInstrInfo::ARMBaseInstrInfo(const ARMSubtarget& STI) + : ARMGenInstrInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP), + Subtarget(STI) { + for (unsigned i = 0, e = array_lengthof(ARM_MLxTable); i != e; ++i) { + if (!MLxEntryMap.insert(std::make_pair(ARM_MLxTable[i].MLxOpc, i)).second) + assert(false && "Duplicated entries?"); + MLxHazardOpcodes.insert(ARM_MLxTable[i].AddSubOpc); + MLxHazardOpcodes.insert(ARM_MLxTable[i].MulOpc); + } +} + +// Use a ScoreboardHazardRecognizer for prepass ARM scheduling. TargetInstrImpl +// currently defaults to no prepass hazard recognizer. +ScheduleHazardRecognizer *ARMBaseInstrInfo:: +CreateTargetHazardRecognizer(const TargetMachine *TM, + const ScheduleDAG *DAG) const { + if (usePreRAHazardRecognizer()) { + const InstrItineraryData *II = TM->getInstrItineraryData(); + return new ScoreboardHazardRecognizer(II, DAG, "pre-RA-sched"); + } + return TargetInstrInfoImpl::CreateTargetHazardRecognizer(TM, DAG); +} + +ScheduleHazardRecognizer *ARMBaseInstrInfo:: +CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II, + const ScheduleDAG *DAG) const { + if (Subtarget.isThumb2() || Subtarget.hasVFP2()) + return (ScheduleHazardRecognizer *) + new ARMHazardRecognizer(II, *this, getRegisterInfo(), Subtarget, DAG); + return TargetInstrInfoImpl::CreateTargetPostRAHazardRecognizer(II, DAG); +} + +MachineInstr * +ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI, + MachineBasicBlock::iterator &MBBI, + LiveVariables *LV) const { + // FIXME: Thumb2 support. + + if (!EnableARM3Addr) + return NULL; + + MachineInstr *MI = MBBI; + MachineFunction &MF = *MI->getParent()->getParent(); + uint64_t 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; + } + + // Try splitting an indexed load/store to an 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 MCInstrDesc &MCID = MI->getDesc(); + unsigned NumOps = MCID.getNumOperands(); + bool isLoad = !MCID.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) { + if (ARM_AM::getSOImmVal(Amt) == -1) + // Can't encode it in a so_imm operand. This transformation will + // add more than 1 instruction. Abandon! + return NULL; + UpdateMI = BuildMI(MF, MI->getDebugLoc(), + get(isSub ? ARM::SUBri : ARM::ADDri), WBReg) + .addReg(BaseReg).addImm(Amt) + .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(MF, MI->getDebugLoc(), + get(isSub ? ARM::SUBrsi : ARM::ADDrsi), WBReg) + .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc) + .addImm(Pred).addReg(0).addReg(0); + } else + UpdateMI = BuildMI(MF, MI->getDebugLoc(), + 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(MF, MI->getDebugLoc(), + get(isSub ? ARM::SUBri : ARM::ADDri), WBReg) + .addReg(BaseReg).addImm(Amt) + .addImm(Pred).addReg(0).addReg(0); + else + UpdateMI = BuildMI(MF, MI->getDebugLoc(), + 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(MF, MI->getDebugLoc(), + get(MemOpc), MI->getOperand(0).getReg()) + .addReg(WBReg).addImm(0).addImm(Pred); + else + MemMI = BuildMI(MF, MI->getDebugLoc(), + 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(MF, MI->getDebugLoc(), + get(MemOpc), MI->getOperand(0).getReg()) + .addReg(BaseReg).addImm(0).addImm(Pred); + else + MemMI = BuildMI(MF, MI->getDebugLoc(), + 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. + if (LV) { + for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { + MachineOperand &MO = MI->getOperand(i); + if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg())) { + unsigned Reg = MO.getReg(); + + 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 +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()) + return false; + --I; + while (I->isDebugValue()) { + if (I == MBB.begin()) + return false; + --I; + } + if (!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 (isUncondBranchOpcode(LastOpc)) { + TBB = LastInst->getOperand(0).getMBB(); + return false; + } + if (isCondBranchOpcode(LastOpc)) { + // 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; + unsigned SecondLastOpc = SecondLastInst->getOpcode(); + + // If AllowModify is true and the block ends with two or more unconditional + // branches, delete all but the first unconditional branch. + if (AllowModify && isUncondBranchOpcode(LastOpc)) { + while (isUncondBranchOpcode(SecondLastOpc)) { + LastInst->eraseFromParent(); + LastInst = SecondLastInst; + LastOpc = LastInst->getOpcode(); + if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) { + // Return now the only terminator is an unconditional branch. + TBB = LastInst->getOperand(0).getMBB(); + return false; + } else { + SecondLastInst = I; + SecondLastOpc = SecondLastInst->getOpcode(); + } + } + } + + // 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 a B and a Bcc, handle it. + if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) { + 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 (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) { + TBB = SecondLastInst->getOperand(0).getMBB(); + I = LastInst; + if (AllowModify) + 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 ((isJumpTableBranchOpcode(SecondLastOpc) || + isIndirectBranchOpcode(SecondLastOpc)) && + isUncondBranchOpcode(LastOpc)) { + I = LastInst; + if (AllowModify) + I->eraseFromParent(); + return true; + } + + // Otherwise, can't handle this. + return true; +} + + +unsigned ARMBaseInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const { + MachineBasicBlock::iterator I = MBB.end(); + if (I == MBB.begin()) return 0; + --I; + while (I->isDebugValue()) { + if (I == MBB.begin()) + return 0; + --I; + } + if (!isUncondBranchOpcode(I->getOpcode()) && + !isCondBranchOpcode(I->getOpcode())) + return 0; + + // Remove the branch. + I->eraseFromParent(); + + I = MBB.end(); + + if (I == MBB.begin()) return 1; + --I; + if (!isCondBranchOpcode(I->getOpcode())) + return 1; + + // Remove the branch. + I->eraseFromParent(); + return 2; +} + +unsigned +ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, + MachineBasicBlock *FBB, + const SmallVectorImpl<MachineOperand> &Cond, + DebugLoc DL) const { + ARMFunctionInfo *AFI = MBB.getParent()->getInfo<ARMFunctionInfo>(); + int BOpc = !AFI->isThumbFunction() + ? ARM::B : (AFI->isThumb2Function() ? ARM::t2B : ARM::tB); + int BccOpc = !AFI->isThumbFunction() + ? ARM::Bcc : (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc); + bool isThumb = AFI->isThumbFunction() || AFI->isThumb2Function(); + + // 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? + if (isThumb) + BuildMI(&MBB, DL, get(BOpc)).addMBB(TBB).addImm(ARMCC::AL).addReg(0); + else + BuildMI(&MBB, DL, get(BOpc)).addMBB(TBB); + } else + BuildMI(&MBB, DL, get(BccOpc)).addMBB(TBB) + .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()); + return 1; + } + + // Two-way conditional branch. + BuildMI(&MBB, DL, get(BccOpc)).addMBB(TBB) + .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()); + if (isThumb) + BuildMI(&MBB, DL, get(BOpc)).addMBB(FBB).addImm(ARMCC::AL).addReg(0); + else + BuildMI(&MBB, DL, get(BOpc)).addMBB(FBB); + return 2; +} + +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:: +PredicateInstruction(MachineInstr *MI, + const SmallVectorImpl<MachineOperand> &Pred) const { + unsigned Opc = MI->getOpcode(); + if (isUncondBranchOpcode(Opc)) { + MI->setDesc(get(getMatchingCondBranchOpcode(Opc))); + 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 { + // FIXME: This confuses implicit_def with optional CPSR def. + const MCInstrDesc &MCID = MI->getDesc(); + if (!MCID.getImplicitDefs() && !MCID.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; +} + +/// isPredicable - Return true if the specified instruction can be predicated. +/// By default, this returns true for every instruction with a +/// PredicateOperand. +bool ARMBaseInstrInfo::isPredicable(MachineInstr *MI) const { + const MCInstrDesc &MCID = MI->getDesc(); + if (!MCID.isPredicable()) + return false; + + if ((MCID.TSFlags & ARMII::DomainMask) == ARMII::DomainNEON) { + ARMFunctionInfo *AFI = + MI->getParent()->getParent()->getInfo<ARMFunctionInfo>(); + return AFI->isThumb2Function(); + } + return true; +} + +/// FIXME: Works around a gcc miscompilation with -fstrict-aliasing. +LLVM_ATTRIBUTE_NOINLINE +static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT, + unsigned JTI); +static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT, + unsigned JTI) { + assert(JTI < JT.size()); + 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 MCAsmInfo *MAI = MF->getTarget().getMCAsmInfo(); + + const MCInstrDesc &MCID = MI->getDesc(); + if (MCID.getSize()) + return MCID.getSize(); + + // If this machine instr is an inline asm, measure it. + if (MI->getOpcode() == ARM::INLINEASM) + return getInlineAsmLength(MI->getOperand(0).getSymbolName(), *MAI); + if (MI->isLabel()) + return 0; + unsigned Opc = MI->getOpcode(); + switch (Opc) { + case TargetOpcode::IMPLICIT_DEF: + case TargetOpcode::KILL: + case TargetOpcode::PROLOG_LABEL: + case TargetOpcode::EH_LABEL: + case TargetOpcode::DBG_VALUE: + return 0; + case ARM::MOVi16_ga_pcrel: + case ARM::MOVTi16_ga_pcrel: + case ARM::t2MOVi16_ga_pcrel: + case ARM::t2MOVTi16_ga_pcrel: + return 4; + case ARM::MOVi32imm: + case ARM::t2MOVi32imm: + return 8; + 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_longjmp: + return 16; + case ARM::tInt_eh_sjlj_longjmp: + return 10; + case ARM::Int_eh_sjlj_setjmp: + case ARM::Int_eh_sjlj_setjmp_nofp: + return 20; + case ARM::tInt_eh_sjlj_setjmp: + case ARM::t2Int_eh_sjlj_setjmp: + case ARM::t2Int_eh_sjlj_setjmp_nofp: + return 12; + case ARM::BR_JTr: + case ARM::BR_JTm: + case ARM::BR_JTadd: + case ARM::tBR_JTr: + case ARM::t2BR_JT: + case ARM::t2TBB_JT: + case ARM::t2TBH_JT: { + // These are jumptable branches, i.e. a branch followed by an inlined + // jumptable. The size is 4 + 4 * number of entries. For TBB, each + // entry is one byte; TBH two byte each. + unsigned EntrySize = (Opc == ARM::t2TBB_JT) + ? 1 : ((Opc == ARM::t2TBH_JT) ? 2 : 4); + unsigned NumOps = MCID.getNumOperands(); + MachineOperand JTOP = + MI->getOperand(NumOps - (MCID.isPredicable() ? 3 : 2)); + unsigned JTI = JTOP.getIndex(); + const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo(); + assert(MJTI != 0); + 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. + unsigned InstSize = (Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT) ? 2 : 4; + unsigned NumEntries = getNumJTEntries(JT, JTI); + if (Opc == ARM::t2TBB_JT && (NumEntries & 1)) + // Make sure the instruction that follows TBB is 2-byte aligned. + // FIXME: Constant island pass should insert an "ALIGN" instruction + // instead. + ++NumEntries; + return NumEntries * EntrySize + InstSize; + } + default: + // Otherwise, pseudo-instruction sizes are zero. + return 0; + } + return 0; // Not reached +} + +void ARMBaseInstrInfo::copyPhysReg(MachineBasicBlock &MBB, + MachineBasicBlock::iterator I, DebugLoc DL, + unsigned DestReg, unsigned SrcReg, + bool KillSrc) const { + bool GPRDest = ARM::GPRRegClass.contains(DestReg); + bool GPRSrc = ARM::GPRRegClass.contains(SrcReg); + + if (GPRDest && GPRSrc) { + AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr), DestReg) + .addReg(SrcReg, getKillRegState(KillSrc)))); + return; + } + + bool SPRDest = ARM::SPRRegClass.contains(DestReg); + bool SPRSrc = ARM::SPRRegClass.contains(SrcReg); + + unsigned Opc = 0; + if (SPRDest && SPRSrc) + Opc = ARM::VMOVS; + else if (GPRDest && SPRSrc) + Opc = ARM::VMOVRS; + else if (SPRDest && GPRSrc) + Opc = ARM::VMOVSR; + else if (ARM::DPRRegClass.contains(DestReg, SrcReg)) + Opc = ARM::VMOVD; + else if (ARM::QPRRegClass.contains(DestReg, SrcReg)) + Opc = ARM::VORRq; + + if (Opc) { + MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(Opc), DestReg); + MIB.addReg(SrcReg, getKillRegState(KillSrc)); + if (Opc == ARM::VORRq) + MIB.addReg(SrcReg, getKillRegState(KillSrc)); + AddDefaultPred(MIB); + return; + } + + // Generate instructions for VMOVQQ and VMOVQQQQ pseudos in place. + if (ARM::QQPRRegClass.contains(DestReg, SrcReg) || + ARM::QQQQPRRegClass.contains(DestReg, SrcReg)) { + const TargetRegisterInfo *TRI = &getRegisterInfo(); + assert(ARM::qsub_0 + 3 == ARM::qsub_3 && "Expected contiguous enum."); + unsigned EndSubReg = ARM::QQPRRegClass.contains(DestReg, SrcReg) ? + ARM::qsub_1 : ARM::qsub_3; + for (unsigned i = ARM::qsub_0, e = EndSubReg + 1; i != e; ++i) { + unsigned Dst = TRI->getSubReg(DestReg, i); + unsigned Src = TRI->getSubReg(SrcReg, i); + MachineInstrBuilder Mov = + AddDefaultPred(BuildMI(MBB, I, I->getDebugLoc(), get(ARM::VORRq)) + .addReg(Dst, RegState::Define) + .addReg(Src, getKillRegState(KillSrc)) + .addReg(Src, getKillRegState(KillSrc))); + if (i == EndSubReg) { + Mov->addRegisterDefined(DestReg, TRI); + if (KillSrc) + Mov->addRegisterKilled(SrcReg, TRI); + } + } + return; + } + llvm_unreachable("Impossible reg-to-reg copy"); +} + +static const +MachineInstrBuilder &AddDReg(MachineInstrBuilder &MIB, + unsigned Reg, unsigned SubIdx, unsigned State, + const TargetRegisterInfo *TRI) { + if (!SubIdx) + return MIB.addReg(Reg, State); + + if (TargetRegisterInfo::isPhysicalRegister(Reg)) + return MIB.addReg(TRI->getSubReg(Reg, SubIdx), State); + return MIB.addReg(Reg, State, SubIdx); +} + +void ARMBaseInstrInfo:: +storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, + unsigned SrcReg, bool isKill, int FI, + const TargetRegisterClass *RC, + const TargetRegisterInfo *TRI) const { + DebugLoc DL; + if (I != MBB.end()) DL = I->getDebugLoc(); + MachineFunction &MF = *MBB.getParent(); + MachineFrameInfo &MFI = *MF.getFrameInfo(); + unsigned Align = MFI.getObjectAlignment(FI); + + MachineMemOperand *MMO = + MF.getMachineMemOperand(MachinePointerInfo( + PseudoSourceValue::getFixedStack(FI)), + MachineMemOperand::MOStore, + MFI.getObjectSize(FI), + Align); + + switch (RC->getSize()) { + case 4: + if (ARM::GPRRegClass.hasSubClassEq(RC)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STRi12)) + .addReg(SrcReg, getKillRegState(isKill)) + .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); + } else if (ARM::SPRRegClass.hasSubClassEq(RC)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRS)) + .addReg(SrcReg, getKillRegState(isKill)) + .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); + } else + llvm_unreachable("Unknown reg class!"); + break; + case 8: + if (ARM::DPRRegClass.hasSubClassEq(RC)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRD)) + .addReg(SrcReg, getKillRegState(isKill)) + .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); + } else + llvm_unreachable("Unknown reg class!"); + break; + case 16: + if (ARM::QPRRegClass.hasSubClassEq(RC)) { + if (Align >= 16 && getRegisterInfo().needsStackRealignment(MF)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1q64Pseudo)) + .addFrameIndex(FI).addImm(16) + .addReg(SrcReg, getKillRegState(isKill)) + .addMemOperand(MMO)); + } else { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMQIA)) + .addReg(SrcReg, getKillRegState(isKill)) + .addFrameIndex(FI) + .addMemOperand(MMO)); + } + } else + llvm_unreachable("Unknown reg class!"); + break; + case 32: + if (ARM::QQPRRegClass.hasSubClassEq(RC)) { + if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) { + // FIXME: It's possible to only store part of the QQ register if the + // spilled def has a sub-register index. + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1d64QPseudo)) + .addFrameIndex(FI).addImm(16) + .addReg(SrcReg, getKillRegState(isKill)) + .addMemOperand(MMO)); + } else { + MachineInstrBuilder MIB = + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMDIA)) + .addFrameIndex(FI)) + .addMemOperand(MMO); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI); + AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI); + } + } else + llvm_unreachable("Unknown reg class!"); + break; + case 64: + if (ARM::QQQQPRRegClass.hasSubClassEq(RC)) { + MachineInstrBuilder MIB = + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMDIA)) + .addFrameIndex(FI)) + .addMemOperand(MMO); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_4, 0, TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_5, 0, TRI); + MIB = AddDReg(MIB, SrcReg, ARM::dsub_6, 0, TRI); + AddDReg(MIB, SrcReg, ARM::dsub_7, 0, TRI); + } else + llvm_unreachable("Unknown reg class!"); + break; + default: + llvm_unreachable("Unknown reg class!"); + } +} + +unsigned +ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case ARM::STRrs: + case ARM::t2STRs: // FIXME: don't use t2STRs to access frame. + 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::STRi12: + case ARM::t2STRi12: + case ARM::tSTRspi: + case ARM::VSTRD: + case ARM::VSTRS: + 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; + case ARM::VST1q64Pseudo: + if (MI->getOperand(0).isFI() && + MI->getOperand(2).getSubReg() == 0) { + FrameIndex = MI->getOperand(0).getIndex(); + return MI->getOperand(2).getReg(); + } + break; + case ARM::VSTMQIA: + if (MI->getOperand(1).isFI() && + MI->getOperand(0).getSubReg() == 0) { + FrameIndex = MI->getOperand(1).getIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + + return 0; +} + +unsigned ARMBaseInstrInfo::isStoreToStackSlotPostFE(const MachineInstr *MI, + int &FrameIndex) const { + const MachineMemOperand *Dummy; + return MI->getDesc().mayStore() && hasStoreToStackSlot(MI, Dummy, FrameIndex); +} + +void ARMBaseInstrInfo:: +loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, + unsigned DestReg, int FI, + const TargetRegisterClass *RC, + const TargetRegisterInfo *TRI) const { + DebugLoc DL; + if (I != MBB.end()) DL = I->getDebugLoc(); + MachineFunction &MF = *MBB.getParent(); + MachineFrameInfo &MFI = *MF.getFrameInfo(); + unsigned Align = MFI.getObjectAlignment(FI); + MachineMemOperand *MMO = + MF.getMachineMemOperand( + MachinePointerInfo(PseudoSourceValue::getFixedStack(FI)), + MachineMemOperand::MOLoad, + MFI.getObjectSize(FI), + Align); + + switch (RC->getSize()) { + case 4: + if (ARM::GPRRegClass.hasSubClassEq(RC)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::LDRi12), DestReg) + .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); + + } else if (ARM::SPRRegClass.hasSubClassEq(RC)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRS), DestReg) + .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); + } else + llvm_unreachable("Unknown reg class!"); + break; + case 8: + if (ARM::DPRRegClass.hasSubClassEq(RC)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRD), DestReg) + .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); + } else + llvm_unreachable("Unknown reg class!"); + break; + case 16: + if (ARM::QPRRegClass.hasSubClassEq(RC)) { + if (Align >= 16 && getRegisterInfo().needsStackRealignment(MF)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1q64Pseudo), DestReg) + .addFrameIndex(FI).addImm(16) + .addMemOperand(MMO)); + } else { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMQIA), DestReg) + .addFrameIndex(FI) + .addMemOperand(MMO)); + } + } else + llvm_unreachable("Unknown reg class!"); + break; + case 32: + if (ARM::QQPRRegClass.hasSubClassEq(RC)) { + if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) { + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1d64QPseudo), DestReg) + .addFrameIndex(FI).addImm(16) + .addMemOperand(MMO)); + } else { + MachineInstrBuilder MIB = + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMDIA)) + .addFrameIndex(FI)) + .addMemOperand(MMO); + MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::Define, TRI); + MIB.addReg(DestReg, RegState::Define | RegState::Implicit); + } + } else + llvm_unreachable("Unknown reg class!"); + break; + case 64: + if (ARM::QQQQPRRegClass.hasSubClassEq(RC)) { + MachineInstrBuilder MIB = + AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMDIA)) + .addFrameIndex(FI)) + .addMemOperand(MMO); + MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_4, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_5, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_6, RegState::Define, TRI); + MIB = AddDReg(MIB, DestReg, ARM::dsub_7, RegState::Define, TRI); + MIB.addReg(DestReg, RegState::Define | RegState::Implicit); + } else + llvm_unreachable("Unknown reg class!"); + break; + default: + llvm_unreachable("Unknown regclass!"); + } +} + +unsigned +ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case ARM::LDRrs: + case ARM::t2LDRs: // FIXME: don't use t2LDRs to access frame. + 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::LDRi12: + case ARM::t2LDRi12: + case ARM::tLDRspi: + case ARM::VLDRD: + case ARM::VLDRS: + 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; + case ARM::VLD1q64Pseudo: + if (MI->getOperand(1).isFI() && + MI->getOperand(0).getSubReg() == 0) { + FrameIndex = MI->getOperand(1).getIndex(); + return MI->getOperand(0).getReg(); + } + break; + case ARM::VLDMQIA: + if (MI->getOperand(1).isFI() && + MI->getOperand(0).getSubReg() == 0) { + FrameIndex = MI->getOperand(1).getIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + + return 0; +} + +unsigned ARMBaseInstrInfo::isLoadFromStackSlotPostFE(const MachineInstr *MI, + int &FrameIndex) const { + const MachineMemOperand *Dummy; + return MI->getDesc().mayLoad() && hasLoadFromStackSlot(MI, Dummy, FrameIndex); +} + +bool ARMBaseInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const{ + // This hook gets to expand COPY instructions before they become + // copyPhysReg() calls. Look for VMOVS instructions that can legally be + // widened to VMOVD. We prefer the VMOVD when possible because it may be + // changed into a VORR that can go down the NEON pipeline. + if (!WidenVMOVS || !MI->isCopy()) + return false; + + // Look for a copy between even S-registers. That is where we keep floats + // when using NEON v2f32 instructions for f32 arithmetic. + unsigned DstRegS = MI->getOperand(0).getReg(); + unsigned SrcRegS = MI->getOperand(1).getReg(); + if (!ARM::SPRRegClass.contains(DstRegS, SrcRegS)) + return false; + + const TargetRegisterInfo *TRI = &getRegisterInfo(); + unsigned DstRegD = TRI->getMatchingSuperReg(DstRegS, ARM::ssub_0, + &ARM::DPRRegClass); + unsigned SrcRegD = TRI->getMatchingSuperReg(SrcRegS, ARM::ssub_0, + &ARM::DPRRegClass); + if (!DstRegD || !SrcRegD) + return false; + + // We want to widen this into a DstRegD = VMOVD SrcRegD copy. This is only + // legal if the COPY already defines the full DstRegD, and it isn't a + // sub-register insertion. + if (!MI->definesRegister(DstRegD, TRI) || MI->readsRegister(DstRegD, TRI)) + return false; + + // A dead copy shouldn't show up here, but reject it just in case. + if (MI->getOperand(0).isDead()) + return false; + + // All clear, widen the COPY. + DEBUG(dbgs() << "widening: " << *MI); + + // Get rid of the old <imp-def> of DstRegD. Leave it if it defines a Q-reg + // or some other super-register. + int ImpDefIdx = MI->findRegisterDefOperandIdx(DstRegD); + if (ImpDefIdx != -1) + MI->RemoveOperand(ImpDefIdx); + + // Change the opcode and operands. + MI->setDesc(get(ARM::VMOVD)); + MI->getOperand(0).setReg(DstRegD); + MI->getOperand(1).setReg(SrcRegD); + AddDefaultPred(MachineInstrBuilder(MI)); + + // We are now reading SrcRegD instead of SrcRegS. This may upset the + // register scavenger and machine verifier, so we need to indicate that we + // are reading an undefined value from SrcRegD, but a proper value from + // SrcRegS. + MI->getOperand(1).setIsUndef(); + MachineInstrBuilder(MI).addReg(SrcRegS, RegState::Implicit); + + // SrcRegD may actually contain an unrelated value in the ssub_1 + // sub-register. Don't kill it. Only kill the ssub_0 sub-register. + if (MI->getOperand(1).isKill()) { + MI->getOperand(1).setIsKill(false); + MI->addRegisterKilled(SrcRegS, TRI, true); + } + + DEBUG(dbgs() << "replaced by: " << *MI); + return true; +} + +MachineInstr* +ARMBaseInstrInfo::emitFrameIndexDebugValue(MachineFunction &MF, + int FrameIx, uint64_t Offset, + const MDNode *MDPtr, + DebugLoc DL) const { + MachineInstrBuilder MIB = BuildMI(MF, DL, get(ARM::DBG_VALUE)) + .addFrameIndex(FrameIx).addImm(0).addImm(Offset).addMetadata(MDPtr); + return &*MIB; +} + +/// Create a copy of a const pool value. Update CPI to the new index and return +/// the label UID. +static unsigned duplicateCPV(MachineFunction &MF, unsigned &CPI) { + MachineConstantPool *MCP = MF.getConstantPool(); + ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>(); + + const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI]; + assert(MCPE.isMachineConstantPoolEntry() && + "Expecting a machine constantpool entry!"); + ARMConstantPoolValue *ACPV = + static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal); + + unsigned PCLabelId = AFI->createPICLabelUId(); + ARMConstantPoolValue *NewCPV = 0; + // FIXME: The below assumes PIC relocation model and that the function + // is Thumb mode (t1 or t2). PCAdjustment would be 8 for ARM mode PIC, and + // zero for non-PIC in ARM or Thumb. The callers are all of thumb LDR + // instructions, so that's probably OK, but is PIC always correct when + // we get here? + if (ACPV->isGlobalValue()) + NewCPV = ARMConstantPoolConstant:: + Create(cast<ARMConstantPoolConstant>(ACPV)->getGV(), PCLabelId, + ARMCP::CPValue, 4); + else if (ACPV->isExtSymbol()) + NewCPV = ARMConstantPoolSymbol:: + Create(MF.getFunction()->getContext(), + cast<ARMConstantPoolSymbol>(ACPV)->getSymbol(), PCLabelId, 4); + else if (ACPV->isBlockAddress()) + NewCPV = ARMConstantPoolConstant:: + Create(cast<ARMConstantPoolConstant>(ACPV)->getBlockAddress(), PCLabelId, + ARMCP::CPBlockAddress, 4); + else if (ACPV->isLSDA()) + NewCPV = ARMConstantPoolConstant::Create(MF.getFunction(), PCLabelId, + ARMCP::CPLSDA, 4); + else if (ACPV->isMachineBasicBlock()) + NewCPV = ARMConstantPoolMBB:: + Create(MF.getFunction()->getContext(), + cast<ARMConstantPoolMBB>(ACPV)->getMBB(), PCLabelId, 4); + else + llvm_unreachable("Unexpected ARM constantpool value type!!"); + CPI = MCP->getConstantPoolIndex(NewCPV, MCPE.getAlignment()); + return PCLabelId; +} + +void ARMBaseInstrInfo:: +reMaterialize(MachineBasicBlock &MBB, + MachineBasicBlock::iterator I, + unsigned DestReg, unsigned SubIdx, + const MachineInstr *Orig, + const TargetRegisterInfo &TRI) const { + unsigned Opcode = Orig->getOpcode(); + switch (Opcode) { + default: { + MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig); + MI->substituteRegister(Orig->getOperand(0).getReg(), DestReg, SubIdx, TRI); + MBB.insert(I, MI); + break; + } + case ARM::tLDRpci_pic: + case ARM::t2LDRpci_pic: { + MachineFunction &MF = *MBB.getParent(); + unsigned CPI = Orig->getOperand(1).getIndex(); + unsigned PCLabelId = duplicateCPV(MF, CPI); + MachineInstrBuilder MIB = BuildMI(MBB, I, Orig->getDebugLoc(), get(Opcode), + DestReg) + .addConstantPoolIndex(CPI).addImm(PCLabelId); + MIB->setMemRefs(Orig->memoperands_begin(), Orig->memoperands_end()); + break; + } + } +} + +MachineInstr * +ARMBaseInstrInfo::duplicate(MachineInstr *Orig, MachineFunction &MF) const { + MachineInstr *MI = TargetInstrInfoImpl::duplicate(Orig, MF); + switch(Orig->getOpcode()) { + case ARM::tLDRpci_pic: + case ARM::t2LDRpci_pic: { + unsigned CPI = Orig->getOperand(1).getIndex(); + unsigned PCLabelId = duplicateCPV(MF, CPI); + Orig->getOperand(1).setIndex(CPI); + Orig->getOperand(2).setImm(PCLabelId); + break; + } + } + return MI; +} + +bool ARMBaseInstrInfo::produceSameValue(const MachineInstr *MI0, + const MachineInstr *MI1, + const MachineRegisterInfo *MRI) const { + int Opcode = MI0->getOpcode(); + if (Opcode == ARM::t2LDRpci || + Opcode == ARM::t2LDRpci_pic || + Opcode == ARM::tLDRpci || + Opcode == ARM::tLDRpci_pic || + Opcode == ARM::MOV_ga_dyn || + Opcode == ARM::MOV_ga_pcrel || + Opcode == ARM::MOV_ga_pcrel_ldr || + Opcode == ARM::t2MOV_ga_dyn || + Opcode == ARM::t2MOV_ga_pcrel) { + if (MI1->getOpcode() != Opcode) + return false; + if (MI0->getNumOperands() != MI1->getNumOperands()) + return false; + + const MachineOperand &MO0 = MI0->getOperand(1); + const MachineOperand &MO1 = MI1->getOperand(1); + if (MO0.getOffset() != MO1.getOffset()) + return false; + + if (Opcode == ARM::MOV_ga_dyn || + Opcode == ARM::MOV_ga_pcrel || + Opcode == ARM::MOV_ga_pcrel_ldr || + Opcode == ARM::t2MOV_ga_dyn || + Opcode == ARM::t2MOV_ga_pcrel) + // Ignore the PC labels. + return MO0.getGlobal() == MO1.getGlobal(); + + const MachineFunction *MF = MI0->getParent()->getParent(); + const MachineConstantPool *MCP = MF->getConstantPool(); + int CPI0 = MO0.getIndex(); + int CPI1 = MO1.getIndex(); + const MachineConstantPoolEntry &MCPE0 = MCP->getConstants()[CPI0]; + const MachineConstantPoolEntry &MCPE1 = MCP->getConstants()[CPI1]; + bool isARMCP0 = MCPE0.isMachineConstantPoolEntry(); + bool isARMCP1 = MCPE1.isMachineConstantPoolEntry(); + if (isARMCP0 && isARMCP1) { + ARMConstantPoolValue *ACPV0 = + static_cast<ARMConstantPoolValue*>(MCPE0.Val.MachineCPVal); + ARMConstantPoolValue *ACPV1 = + static_cast<ARMConstantPoolValue*>(MCPE1.Val.MachineCPVal); + return ACPV0->hasSameValue(ACPV1); + } else if (!isARMCP0 && !isARMCP1) { + return MCPE0.Val.ConstVal == MCPE1.Val.ConstVal; + } + return false; + } else if (Opcode == ARM::PICLDR) { + if (MI1->getOpcode() != Opcode) + return false; + if (MI0->getNumOperands() != MI1->getNumOperands()) + return false; + + unsigned Addr0 = MI0->getOperand(1).getReg(); + unsigned Addr1 = MI1->getOperand(1).getReg(); + if (Addr0 != Addr1) { + if (!MRI || + !TargetRegisterInfo::isVirtualRegister(Addr0) || + !TargetRegisterInfo::isVirtualRegister(Addr1)) + return false; + + // This assumes SSA form. + MachineInstr *Def0 = MRI->getVRegDef(Addr0); + MachineInstr *Def1 = MRI->getVRegDef(Addr1); + // Check if the loaded value, e.g. a constantpool of a global address, are + // the same. + if (!produceSameValue(Def0, Def1, MRI)) + return false; + } + + for (unsigned i = 3, e = MI0->getNumOperands(); i != e; ++i) { + // %vreg12<def> = PICLDR %vreg11, 0, pred:14, pred:%noreg + const MachineOperand &MO0 = MI0->getOperand(i); + const MachineOperand &MO1 = MI1->getOperand(i); + if (!MO0.isIdenticalTo(MO1)) + return false; + } + return true; + } + + return MI0->isIdenticalTo(MI1, MachineInstr::IgnoreVRegDefs); +} + +/// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler to +/// determine if two loads are loading from the same base address. It should +/// only return true if the base pointers are the same and the only differences +/// between the two addresses is the offset. It also returns the offsets by +/// reference. +bool ARMBaseInstrInfo::areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2, + int64_t &Offset1, + int64_t &Offset2) const { + // Don't worry about Thumb: just ARM and Thumb2. + if (Subtarget.isThumb1Only()) return false; + + if (!Load1->isMachineOpcode() || !Load2->isMachineOpcode()) + return false; + + switch (Load1->getMachineOpcode()) { + default: + return false; + case ARM::LDRi12: + case ARM::LDRBi12: + case ARM::LDRD: + case ARM::LDRH: + case ARM::LDRSB: + case ARM::LDRSH: + case ARM::VLDRD: + case ARM::VLDRS: + case ARM::t2LDRi8: + case ARM::t2LDRDi8: + case ARM::t2LDRSHi8: + case ARM::t2LDRi12: + case ARM::t2LDRSHi12: + break; + } + + switch (Load2->getMachineOpcode()) { + default: + return false; + case ARM::LDRi12: + case ARM::LDRBi12: + case ARM::LDRD: + case ARM::LDRH: + case ARM::LDRSB: + case ARM::LDRSH: + case ARM::VLDRD: + case ARM::VLDRS: + case ARM::t2LDRi8: + case ARM::t2LDRDi8: + case ARM::t2LDRSHi8: + case ARM::t2LDRi12: + case ARM::t2LDRSHi12: + break; + } + + // Check if base addresses and chain operands match. + if (Load1->getOperand(0) != Load2->getOperand(0) || + Load1->getOperand(4) != Load2->getOperand(4)) + return false; + + // Index should be Reg0. + if (Load1->getOperand(3) != Load2->getOperand(3)) + return false; + + // Determine the offsets. + if (isa<ConstantSDNode>(Load1->getOperand(1)) && + isa<ConstantSDNode>(Load2->getOperand(1))) { + Offset1 = cast<ConstantSDNode>(Load1->getOperand(1))->getSExtValue(); + Offset2 = cast<ConstantSDNode>(Load2->getOperand(1))->getSExtValue(); + return true; + } + + return false; +} + +/// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to +/// determine (in conjunction with areLoadsFromSameBasePtr) if two loads should +/// be scheduled togther. On some targets if two loads are loading from +/// addresses in the same cache line, it's better if they are scheduled +/// together. This function takes two integers that represent the load offsets +/// from the common base address. It returns true if it decides it's desirable +/// to schedule the two loads together. "NumLoads" is the number of loads that +/// have already been scheduled after Load1. +bool ARMBaseInstrInfo::shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2, + int64_t Offset1, int64_t Offset2, + unsigned NumLoads) const { + // Don't worry about Thumb: just ARM and Thumb2. + if (Subtarget.isThumb1Only()) return false; + + assert(Offset2 > Offset1); + + if ((Offset2 - Offset1) / 8 > 64) + return false; + + if (Load1->getMachineOpcode() != Load2->getMachineOpcode()) + return false; // FIXME: overly conservative? + + // Four loads in a row should be sufficient. + if (NumLoads >= 3) + return false; + + return true; +} + +bool ARMBaseInstrInfo::isSchedulingBoundary(const MachineInstr *MI, + const MachineBasicBlock *MBB, + const MachineFunction &MF) const { + // Debug info is never a scheduling boundary. It's necessary to be explicit + // due to the special treatment of IT instructions below, otherwise a + // dbg_value followed by an IT will result in the IT instruction being + // considered a scheduling hazard, which is wrong. It should be the actual + // instruction preceding the dbg_value instruction(s), just like it is + // when debug info is not present. + if (MI->isDebugValue()) + return false; + + // Terminators and labels can't be scheduled around. + if (MI->getDesc().isTerminator() || MI->isLabel()) + return true; + + // Treat the start of the IT block as a scheduling boundary, but schedule + // t2IT along with all instructions following it. + // FIXME: This is a big hammer. But the alternative is to add all potential + // true and anti dependencies to IT block instructions as implicit operands + // to the t2IT instruction. The added compile time and complexity does not + // seem worth it. + MachineBasicBlock::const_iterator I = MI; + // Make sure to skip any dbg_value instructions + while (++I != MBB->end() && I->isDebugValue()) + ; + if (I != MBB->end() && I->getOpcode() == ARM::t2IT) + return true; + + // Don't attempt to schedule around any instruction that defines + // a stack-oriented pointer, as it's unlikely to be profitable. This + // saves compile time, because it doesn't require every single + // stack slot reference to depend on the instruction that does the + // modification. + if (MI->definesRegister(ARM::SP)) + return true; + + return false; +} + +bool ARMBaseInstrInfo:: +isProfitableToIfCvt(MachineBasicBlock &MBB, + unsigned NumCycles, unsigned ExtraPredCycles, + const BranchProbability &Probability) const { + if (!NumCycles) + return false; + + // Attempt to estimate the relative costs of predication versus branching. + unsigned UnpredCost = Probability.getNumerator() * NumCycles; + UnpredCost /= Probability.getDenominator(); + UnpredCost += 1; // The branch itself + UnpredCost += Subtarget.getMispredictionPenalty() / 10; + + return (NumCycles + ExtraPredCycles) <= UnpredCost; +} + +bool ARMBaseInstrInfo:: +isProfitableToIfCvt(MachineBasicBlock &TMBB, + unsigned TCycles, unsigned TExtra, + MachineBasicBlock &FMBB, + unsigned FCycles, unsigned FExtra, + const BranchProbability &Probability) const { + if (!TCycles || !FCycles) + return false; + + // Attempt to estimate the relative costs of predication versus branching. + unsigned TUnpredCost = Probability.getNumerator() * TCycles; + TUnpredCost /= Probability.getDenominator(); + + uint32_t Comp = Probability.getDenominator() - Probability.getNumerator(); + unsigned FUnpredCost = Comp * FCycles; + FUnpredCost /= Probability.getDenominator(); + + unsigned UnpredCost = TUnpredCost + FUnpredCost; + UnpredCost += 1; // The branch itself + UnpredCost += Subtarget.getMispredictionPenalty() / 10; + + return (TCycles + FCycles + TExtra + FExtra) <= UnpredCost; +} + +/// getInstrPredicate - If instruction is predicated, returns its predicate +/// condition, otherwise returns AL. It also returns the condition code +/// register by reference. +ARMCC::CondCodes +llvm::getInstrPredicate(const MachineInstr *MI, unsigned &PredReg) { + int PIdx = MI->findFirstPredOperandIdx(); + if (PIdx == -1) { + PredReg = 0; + return ARMCC::AL; + } + + PredReg = MI->getOperand(PIdx+1).getReg(); + return (ARMCC::CondCodes)MI->getOperand(PIdx).getImm(); +} + + +int llvm::getMatchingCondBranchOpcode(int Opc) { + if (Opc == ARM::B) + return ARM::Bcc; + else if (Opc == ARM::tB) + return ARM::tBcc; + else if (Opc == ARM::t2B) + return ARM::t2Bcc; + + llvm_unreachable("Unknown unconditional branch opcode!"); + return 0; +} + + +/// Map pseudo instructions that imply an 'S' bit onto real opcodes. Whether the +/// instruction is encoded with an 'S' bit is determined by the optional CPSR +/// def operand. +/// +/// This will go away once we can teach tblgen how to set the optional CPSR def +/// operand itself. +struct AddSubFlagsOpcodePair { + unsigned PseudoOpc; + unsigned MachineOpc; +}; + +static AddSubFlagsOpcodePair AddSubFlagsOpcodeMap[] = { + {ARM::ADDSri, ARM::ADDri}, + {ARM::ADDSrr, ARM::ADDrr}, + {ARM::ADDSrsi, ARM::ADDrsi}, + {ARM::ADDSrsr, ARM::ADDrsr}, + + {ARM::SUBSri, ARM::SUBri}, + {ARM::SUBSrr, ARM::SUBrr}, + {ARM::SUBSrsi, ARM::SUBrsi}, + {ARM::SUBSrsr, ARM::SUBrsr}, + + {ARM::RSBSri, ARM::RSBri}, + {ARM::RSBSrr, ARM::RSBrr}, + {ARM::RSBSrsi, ARM::RSBrsi}, + {ARM::RSBSrsr, ARM::RSBrsr}, + + {ARM::t2ADDSri, ARM::t2ADDri}, + {ARM::t2ADDSrr, ARM::t2ADDrr}, + {ARM::t2ADDSrs, ARM::t2ADDrs}, + + {ARM::t2SUBSri, ARM::t2SUBri}, + {ARM::t2SUBSrr, ARM::t2SUBrr}, + {ARM::t2SUBSrs, ARM::t2SUBrs}, + + {ARM::t2RSBSri, ARM::t2RSBri}, + {ARM::t2RSBSrs, ARM::t2RSBrs}, +}; + +unsigned llvm::convertAddSubFlagsOpcode(unsigned OldOpc) { + static const int NPairs = + sizeof(AddSubFlagsOpcodeMap) / sizeof(AddSubFlagsOpcodePair); + for (AddSubFlagsOpcodePair *OpcPair = &AddSubFlagsOpcodeMap[0], + *End = &AddSubFlagsOpcodeMap[NPairs]; OpcPair != End; ++OpcPair) { + if (OldOpc == OpcPair->PseudoOpc) { + return OpcPair->MachineOpc; + } + } + return 0; +} + +void llvm::emitARMRegPlusImmediate(MachineBasicBlock &MBB, + MachineBasicBlock::iterator &MBBI, DebugLoc dl, + unsigned DestReg, unsigned BaseReg, int NumBytes, + ARMCC::CondCodes Pred, unsigned PredReg, + const ARMBaseInstrInfo &TII, unsigned MIFlags) { + bool isSub = NumBytes < 0; + if (isSub) NumBytes = -NumBytes; + + while (NumBytes) { + unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes); + unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt); + assert(ThisVal && "Didn't extract field correctly"); + + // We will handle these bits from offset, clear them. + NumBytes &= ~ThisVal; + + assert(ARM_AM::getSOImmVal(ThisVal) != -1 && "Bit extraction didn't work?"); + + // Build the new ADD / SUB. + unsigned Opc = isSub ? ARM::SUBri : ARM::ADDri; + BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg) + .addReg(BaseReg, RegState::Kill).addImm(ThisVal) + .addImm((unsigned)Pred).addReg(PredReg).addReg(0) + .setMIFlags(MIFlags); + BaseReg = DestReg; + } +} + +bool llvm::rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx, + unsigned FrameReg, int &Offset, + const ARMBaseInstrInfo &TII) { + unsigned Opcode = MI.getOpcode(); + const MCInstrDesc &Desc = MI.getDesc(); + unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask); + bool isSub = false; + + // Memory operands in inline assembly always use AddrMode2. + if (Opcode == ARM::INLINEASM) + AddrMode = ARMII::AddrMode2; + + if (Opcode == ARM::ADDri) { + Offset += MI.getOperand(FrameRegIdx+1).getImm(); + if (Offset == 0) { + // Turn it into a move. + MI.setDesc(TII.get(ARM::MOVr)); + MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false); + MI.RemoveOperand(FrameRegIdx+1); + Offset = 0; + return true; + } else if (Offset < 0) { + Offset = -Offset; + isSub = true; + MI.setDesc(TII.get(ARM::SUBri)); + } + + // Common case: small offset, fits into instruction. + if (ARM_AM::getSOImmVal(Offset) != -1) { + // Replace the FrameIndex with sp / fp + MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false); + MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset); + Offset = 0; + return true; + } + + // Otherwise, pull as much of the immedidate into this ADDri/SUBri + // as possible. + unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset); + unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt); + + // We will handle these bits from offset, clear them. + Offset &= ~ThisImmVal; + + // Get the properly encoded SOImmVal field. + assert(ARM_AM::getSOImmVal(ThisImmVal) != -1 && + "Bit extraction didn't work?"); + MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal); + } else { + unsigned ImmIdx = 0; + int InstrOffs = 0; + unsigned NumBits = 0; + unsigned Scale = 1; + switch (AddrMode) { + case ARMII::AddrMode_i12: { + ImmIdx = FrameRegIdx + 1; + InstrOffs = MI.getOperand(ImmIdx).getImm(); + NumBits = 12; + break; + } + case ARMII::AddrMode2: { + ImmIdx = FrameRegIdx+2; + InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm()); + if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub) + InstrOffs *= -1; + NumBits = 12; + break; + } + case ARMII::AddrMode3: { + ImmIdx = FrameRegIdx+2; + InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm()); + if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub) + InstrOffs *= -1; + NumBits = 8; + break; + } + case ARMII::AddrMode4: + case ARMII::AddrMode6: + // Can't fold any offset even if it's zero. + return false; + case ARMII::AddrMode5: { + ImmIdx = FrameRegIdx+1; + InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm()); + if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub) + InstrOffs *= -1; + NumBits = 8; + Scale = 4; + break; + } + default: + llvm_unreachable("Unsupported addressing mode!"); + break; + } + + Offset += InstrOffs * Scale; + assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!"); + if (Offset < 0) { + Offset = -Offset; + isSub = true; + } + + // Attempt to fold address comp. if opcode has offset bits + if (NumBits > 0) { + // Common case: small offset, fits into instruction. + MachineOperand &ImmOp = MI.getOperand(ImmIdx); + int ImmedOffset = Offset / Scale; + unsigned Mask = (1 << NumBits) - 1; + if ((unsigned)Offset <= Mask * Scale) { + // Replace the FrameIndex with sp + MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false); + // FIXME: When addrmode2 goes away, this will simplify (like the + // T2 version), as the LDR.i12 versions don't need the encoding + // tricks for the offset value. + if (isSub) { + if (AddrMode == ARMII::AddrMode_i12) + ImmedOffset = -ImmedOffset; + else + ImmedOffset |= 1 << NumBits; + } + ImmOp.ChangeToImmediate(ImmedOffset); + Offset = 0; + return true; + } + + // Otherwise, it didn't fit. Pull in what we can to simplify the immed. + ImmedOffset = ImmedOffset & Mask; + if (isSub) { + if (AddrMode == ARMII::AddrMode_i12) + ImmedOffset = -ImmedOffset; + else + ImmedOffset |= 1 << NumBits; + } + ImmOp.ChangeToImmediate(ImmedOffset); + Offset &= ~(Mask*Scale); + } + } + + Offset = (isSub) ? -Offset : Offset; + return Offset == 0; +} + +bool ARMBaseInstrInfo:: +AnalyzeCompare(const MachineInstr *MI, unsigned &SrcReg, int &CmpMask, + int &CmpValue) const { + switch (MI->getOpcode()) { + default: break; + case ARM::CMPri: + case ARM::t2CMPri: + SrcReg = MI->getOperand(0).getReg(); + CmpMask = ~0; + CmpValue = MI->getOperand(1).getImm(); + return true; + case ARM::TSTri: + case ARM::t2TSTri: + SrcReg = MI->getOperand(0).getReg(); + CmpMask = MI->getOperand(1).getImm(); + CmpValue = 0; + return true; + } + + return false; +} + +/// isSuitableForMask - Identify a suitable 'and' instruction that +/// operates on the given source register and applies the same mask +/// as a 'tst' instruction. Provide a limited look-through for copies. +/// When successful, MI will hold the found instruction. +static bool isSuitableForMask(MachineInstr *&MI, unsigned SrcReg, + int CmpMask, bool CommonUse) { + switch (MI->getOpcode()) { + case ARM::ANDri: + case ARM::t2ANDri: + if (CmpMask != MI->getOperand(2).getImm()) + return false; + if (SrcReg == MI->getOperand(CommonUse ? 1 : 0).getReg()) + return true; + break; + case ARM::COPY: { + // Walk down one instruction which is potentially an 'and'. + const MachineInstr &Copy = *MI; + MachineBasicBlock::iterator AND( + llvm::next(MachineBasicBlock::iterator(MI))); + if (AND == MI->getParent()->end()) return false; + MI = AND; + return isSuitableForMask(MI, Copy.getOperand(0).getReg(), + CmpMask, true); + } + } + + return false; +} + +/// OptimizeCompareInstr - Convert the instruction supplying the argument to the +/// comparison into one that sets the zero bit in the flags register. +bool ARMBaseInstrInfo:: +OptimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg, int CmpMask, + int CmpValue, const MachineRegisterInfo *MRI) const { + if (CmpValue != 0) + return false; + + MachineRegisterInfo::def_iterator DI = MRI->def_begin(SrcReg); + if (llvm::next(DI) != MRI->def_end()) + // Only support one definition. + return false; + + MachineInstr *MI = &*DI; + + // Masked compares sometimes use the same register as the corresponding 'and'. + if (CmpMask != ~0) { + if (!isSuitableForMask(MI, SrcReg, CmpMask, false)) { + MI = 0; + for (MachineRegisterInfo::use_iterator UI = MRI->use_begin(SrcReg), + UE = MRI->use_end(); UI != UE; ++UI) { + if (UI->getParent() != CmpInstr->getParent()) continue; + MachineInstr *PotentialAND = &*UI; + if (!isSuitableForMask(PotentialAND, SrcReg, CmpMask, true)) + continue; + MI = PotentialAND; + break; + } + if (!MI) return false; + } + } + + // Conservatively refuse to convert an instruction which isn't in the same BB + // as the comparison. + if (MI->getParent() != CmpInstr->getParent()) + return false; + + // Check that CPSR isn't set between the comparison instruction and the one we + // want to change. + MachineBasicBlock::const_iterator I = CmpInstr, E = MI, + B = MI->getParent()->begin(); + + // Early exit if CmpInstr is at the beginning of the BB. + if (I == B) return false; + + --I; + for (; I != E; --I) { + const MachineInstr &Instr = *I; + + for (unsigned IO = 0, EO = Instr.getNumOperands(); IO != EO; ++IO) { + const MachineOperand &MO = Instr.getOperand(IO); + if (!MO.isReg()) continue; + + // This instruction modifies or uses CPSR after the one we want to + // change. We can't do this transformation. + if (MO.getReg() == ARM::CPSR) + return false; + } + + if (I == B) + // The 'and' is below the comparison instruction. + return false; + } + + // Set the "zero" bit in CPSR. + switch (MI->getOpcode()) { + default: break; + case ARM::RSBrr: + case ARM::RSBri: + case ARM::RSCrr: + case ARM::RSCri: + case ARM::ADDrr: + case ARM::ADDri: + case ARM::ADCrr: + case ARM::ADCri: + case ARM::SUBrr: + case ARM::SUBri: + case ARM::SBCrr: + case ARM::SBCri: + case ARM::t2RSBri: + case ARM::t2ADDrr: + case ARM::t2ADDri: + case ARM::t2ADCrr: + case ARM::t2ADCri: + case ARM::t2SUBrr: + case ARM::t2SUBri: + case ARM::t2SBCrr: + case ARM::t2SBCri: + case ARM::ANDrr: + case ARM::ANDri: + case ARM::t2ANDrr: + case ARM::t2ANDri: + case ARM::ORRrr: + case ARM::ORRri: + case ARM::t2ORRrr: + case ARM::t2ORRri: + case ARM::EORrr: + case ARM::EORri: + case ARM::t2EORrr: + case ARM::t2EORri: { + // Scan forward for the use of CPSR, if it's a conditional code requires + // checking of V bit, then this is not safe to do. If we can't find the + // CPSR use (i.e. used in another block), then it's not safe to perform + // the optimization. + bool isSafe = false; + I = CmpInstr; + E = MI->getParent()->end(); + while (!isSafe && ++I != E) { + const MachineInstr &Instr = *I; + for (unsigned IO = 0, EO = Instr.getNumOperands(); + !isSafe && IO != EO; ++IO) { + const MachineOperand &MO = Instr.getOperand(IO); + if (!MO.isReg() || MO.getReg() != ARM::CPSR) + continue; + if (MO.isDef()) { + isSafe = true; + break; + } + // Condition code is after the operand before CPSR. + ARMCC::CondCodes CC = (ARMCC::CondCodes)Instr.getOperand(IO-1).getImm(); + switch (CC) { + default: + isSafe = true; + break; + case ARMCC::VS: + case ARMCC::VC: + case ARMCC::GE: + case ARMCC::LT: + case ARMCC::GT: + case ARMCC::LE: + return false; + } + } + } + + if (!isSafe) + return false; + + // Toggle the optional operand to CPSR. + MI->getOperand(5).setReg(ARM::CPSR); + MI->getOperand(5).setIsDef(true); + CmpInstr->eraseFromParent(); + return true; + } + } + + return false; +} + +bool ARMBaseInstrInfo::FoldImmediate(MachineInstr *UseMI, + MachineInstr *DefMI, unsigned Reg, + MachineRegisterInfo *MRI) const { + // Fold large immediates into add, sub, or, xor. + unsigned DefOpc = DefMI->getOpcode(); + if (DefOpc != ARM::t2MOVi32imm && DefOpc != ARM::MOVi32imm) + return false; + if (!DefMI->getOperand(1).isImm()) + // Could be t2MOVi32imm <ga:xx> + return false; + + if (!MRI->hasOneNonDBGUse(Reg)) + return false; + + unsigned UseOpc = UseMI->getOpcode(); + unsigned NewUseOpc = 0; + uint32_t ImmVal = (uint32_t)DefMI->getOperand(1).getImm(); + uint32_t SOImmValV1 = 0, SOImmValV2 = 0; + bool Commute = false; + switch (UseOpc) { + default: return false; + case ARM::SUBrr: + case ARM::ADDrr: + case ARM::ORRrr: + case ARM::EORrr: + case ARM::t2SUBrr: + case ARM::t2ADDrr: + case ARM::t2ORRrr: + case ARM::t2EORrr: { + Commute = UseMI->getOperand(2).getReg() != Reg; + switch (UseOpc) { + default: break; + case ARM::SUBrr: { + if (Commute) + return false; + ImmVal = -ImmVal; + NewUseOpc = ARM::SUBri; + // Fallthrough + } + case ARM::ADDrr: + case ARM::ORRrr: + case ARM::EORrr: { + if (!ARM_AM::isSOImmTwoPartVal(ImmVal)) + return false; + SOImmValV1 = (uint32_t)ARM_AM::getSOImmTwoPartFirst(ImmVal); + SOImmValV2 = (uint32_t)ARM_AM::getSOImmTwoPartSecond(ImmVal); + switch (UseOpc) { + default: break; + case ARM::ADDrr: NewUseOpc = ARM::ADDri; break; + case ARM::ORRrr: NewUseOpc = ARM::ORRri; break; + case ARM::EORrr: NewUseOpc = ARM::EORri; break; + } + break; + } + case ARM::t2SUBrr: { + if (Commute) + return false; + ImmVal = -ImmVal; + NewUseOpc = ARM::t2SUBri; + // Fallthrough + } + case ARM::t2ADDrr: + case ARM::t2ORRrr: + case ARM::t2EORrr: { + if (!ARM_AM::isT2SOImmTwoPartVal(ImmVal)) + return false; + SOImmValV1 = (uint32_t)ARM_AM::getT2SOImmTwoPartFirst(ImmVal); + SOImmValV2 = (uint32_t)ARM_AM::getT2SOImmTwoPartSecond(ImmVal); + switch (UseOpc) { + default: break; + case ARM::t2ADDrr: NewUseOpc = ARM::t2ADDri; break; + case ARM::t2ORRrr: NewUseOpc = ARM::t2ORRri; break; + case ARM::t2EORrr: NewUseOpc = ARM::t2EORri; break; + } + break; + } + } + } + } + + unsigned OpIdx = Commute ? 2 : 1; + unsigned Reg1 = UseMI->getOperand(OpIdx).getReg(); + bool isKill = UseMI->getOperand(OpIdx).isKill(); + unsigned NewReg = MRI->createVirtualRegister(MRI->getRegClass(Reg)); + AddDefaultCC(AddDefaultPred(BuildMI(*UseMI->getParent(), + *UseMI, UseMI->getDebugLoc(), + get(NewUseOpc), NewReg) + .addReg(Reg1, getKillRegState(isKill)) + .addImm(SOImmValV1))); + UseMI->setDesc(get(NewUseOpc)); + UseMI->getOperand(1).setReg(NewReg); + UseMI->getOperand(1).setIsKill(); + UseMI->getOperand(2).ChangeToImmediate(SOImmValV2); + DefMI->eraseFromParent(); + return true; +} + +unsigned +ARMBaseInstrInfo::getNumMicroOps(const InstrItineraryData *ItinData, + const MachineInstr *MI) const { + if (!ItinData || ItinData->isEmpty()) + return 1; + + const MCInstrDesc &Desc = MI->getDesc(); + unsigned Class = Desc.getSchedClass(); + unsigned UOps = ItinData->Itineraries[Class].NumMicroOps; + if (UOps) + return UOps; + + unsigned Opc = MI->getOpcode(); + switch (Opc) { + default: + llvm_unreachable("Unexpected multi-uops instruction!"); + break; + case ARM::VLDMQIA: + case ARM::VSTMQIA: + return 2; + + // The number of uOps for load / store multiple are determined by the number + // registers. + // + // On Cortex-A8, each pair of register loads / stores can be scheduled on the + // same cycle. The scheduling for the first load / store must be done + // separately by assuming the the address is not 64-bit aligned. + // + // On Cortex-A9, the formula is simply (#reg / 2) + (#reg % 2). If the address + // is not 64-bit aligned, then AGU would take an extra cycle. For VFP / NEON + // load / store multiple, the formula is (#reg / 2) + (#reg % 2) + 1. + case ARM::VLDMDIA: + case ARM::VLDMDIA_UPD: + case ARM::VLDMDDB_UPD: + case ARM::VLDMSIA: + case ARM::VLDMSIA_UPD: + case ARM::VLDMSDB_UPD: + case ARM::VSTMDIA: + case ARM::VSTMDIA_UPD: + case ARM::VSTMDDB_UPD: + case ARM::VSTMSIA: + case ARM::VSTMSIA_UPD: + case ARM::VSTMSDB_UPD: { + unsigned NumRegs = MI->getNumOperands() - Desc.getNumOperands(); + return (NumRegs / 2) + (NumRegs % 2) + 1; + } + + case ARM::LDMIA_RET: + case ARM::LDMIA: + case ARM::LDMDA: + case ARM::LDMDB: + case ARM::LDMIB: + case ARM::LDMIA_UPD: + case ARM::LDMDA_UPD: + case ARM::LDMDB_UPD: + case ARM::LDMIB_UPD: + case ARM::STMIA: + case ARM::STMDA: + case ARM::STMDB: + case ARM::STMIB: + case ARM::STMIA_UPD: + case ARM::STMDA_UPD: + case ARM::STMDB_UPD: + case ARM::STMIB_UPD: + case ARM::tLDMIA: + case ARM::tLDMIA_UPD: + case ARM::tSTMIA_UPD: + case ARM::tPOP_RET: + case ARM::tPOP: + case ARM::tPUSH: + case ARM::t2LDMIA_RET: + case ARM::t2LDMIA: + case ARM::t2LDMDB: + case ARM::t2LDMIA_UPD: + case ARM::t2LDMDB_UPD: + case ARM::t2STMIA: + case ARM::t2STMDB: + case ARM::t2STMIA_UPD: + case ARM::t2STMDB_UPD: { + unsigned NumRegs = MI->getNumOperands() - Desc.getNumOperands() + 1; + if (Subtarget.isCortexA8()) { + if (NumRegs < 4) + return 2; + // 4 registers would be issued: 2, 2. + // 5 registers would be issued: 2, 2, 1. + UOps = (NumRegs / 2); + if (NumRegs % 2) + ++UOps; + return UOps; + } else if (Subtarget.isCortexA9()) { + UOps = (NumRegs / 2); + // If there are odd number of registers or if it's not 64-bit aligned, + // then it takes an extra AGU (Address Generation Unit) cycle. + if ((NumRegs % 2) || + !MI->hasOneMemOperand() || + (*MI->memoperands_begin())->getAlignment() < 8) + ++UOps; + return UOps; + } else { + // Assume the worst. + return NumRegs; + } + } + } +} + +int +ARMBaseInstrInfo::getVLDMDefCycle(const InstrItineraryData *ItinData, + const MCInstrDesc &DefMCID, + unsigned DefClass, + unsigned DefIdx, unsigned DefAlign) const { + int RegNo = (int)(DefIdx+1) - DefMCID.getNumOperands() + 1; + if (RegNo <= 0) + // Def is the address writeback. + return ItinData->getOperandCycle(DefClass, DefIdx); + + int DefCycle; + if (Subtarget.isCortexA8()) { + // (regno / 2) + (regno % 2) + 1 + DefCycle = RegNo / 2 + 1; + if (RegNo % 2) + ++DefCycle; + } else if (Subtarget.isCortexA9()) { + DefCycle = RegNo; + bool isSLoad = false; + + switch (DefMCID.getOpcode()) { + default: break; + case ARM::VLDMSIA: + case ARM::VLDMSIA_UPD: + case ARM::VLDMSDB_UPD: + isSLoad = true; + break; + } + + // If there are odd number of 'S' registers or if it's not 64-bit aligned, + // then it takes an extra cycle. + if ((isSLoad && (RegNo % 2)) || DefAlign < 8) + ++DefCycle; + } else { + // Assume the worst. + DefCycle = RegNo + 2; + } + + return DefCycle; +} + +int +ARMBaseInstrInfo::getLDMDefCycle(const InstrItineraryData *ItinData, + const MCInstrDesc &DefMCID, + unsigned DefClass, + unsigned DefIdx, unsigned DefAlign) const { + int RegNo = (int)(DefIdx+1) - DefMCID.getNumOperands() + 1; + if (RegNo <= 0) + // Def is the address writeback. + return ItinData->getOperandCycle(DefClass, DefIdx); + + int DefCycle; + if (Subtarget.isCortexA8()) { + // 4 registers would be issued: 1, 2, 1. + // 5 registers would be issued: 1, 2, 2. + DefCycle = RegNo / 2; + if (DefCycle < 1) + DefCycle = 1; + // Result latency is issue cycle + 2: E2. + DefCycle += 2; + } else if (Subtarget.isCortexA9()) { + DefCycle = (RegNo / 2); + // If there are odd number of registers or if it's not 64-bit aligned, + // then it takes an extra AGU (Address Generation Unit) cycle. + if ((RegNo % 2) || DefAlign < 8) + ++DefCycle; + // Result latency is AGU cycles + 2. + DefCycle += 2; + } else { + // Assume the worst. + DefCycle = RegNo + 2; + } + + return DefCycle; +} + +int +ARMBaseInstrInfo::getVSTMUseCycle(const InstrItineraryData *ItinData, + const MCInstrDesc &UseMCID, + unsigned UseClass, + unsigned UseIdx, unsigned UseAlign) const { + int RegNo = (int)(UseIdx+1) - UseMCID.getNumOperands() + 1; + if (RegNo <= 0) + return ItinData->getOperandCycle(UseClass, UseIdx); + + int UseCycle; + if (Subtarget.isCortexA8()) { + // (regno / 2) + (regno % 2) + 1 + UseCycle = RegNo / 2 + 1; + if (RegNo % 2) + ++UseCycle; + } else if (Subtarget.isCortexA9()) { + UseCycle = RegNo; + bool isSStore = false; + + switch (UseMCID.getOpcode()) { + default: break; + case ARM::VSTMSIA: + case ARM::VSTMSIA_UPD: + case ARM::VSTMSDB_UPD: + isSStore = true; + break; + } + + // If there are odd number of 'S' registers or if it's not 64-bit aligned, + // then it takes an extra cycle. + if ((isSStore && (RegNo % 2)) || UseAlign < 8) + ++UseCycle; + } else { + // Assume the worst. + UseCycle = RegNo + 2; + } + + return UseCycle; +} + +int +ARMBaseInstrInfo::getSTMUseCycle(const InstrItineraryData *ItinData, + const MCInstrDesc &UseMCID, + unsigned UseClass, + unsigned UseIdx, unsigned UseAlign) const { + int RegNo = (int)(UseIdx+1) - UseMCID.getNumOperands() + 1; + if (RegNo <= 0) + return ItinData->getOperandCycle(UseClass, UseIdx); + + int UseCycle; + if (Subtarget.isCortexA8()) { + UseCycle = RegNo / 2; + if (UseCycle < 2) + UseCycle = 2; + // Read in E3. + UseCycle += 2; + } else if (Subtarget.isCortexA9()) { + UseCycle = (RegNo / 2); + // If there are odd number of registers or if it's not 64-bit aligned, + // then it takes an extra AGU (Address Generation Unit) cycle. + if ((RegNo % 2) || UseAlign < 8) + ++UseCycle; + } else { + // Assume the worst. + UseCycle = 1; + } + return UseCycle; +} + +int +ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData, + const MCInstrDesc &DefMCID, + unsigned DefIdx, unsigned DefAlign, + const MCInstrDesc &UseMCID, + unsigned UseIdx, unsigned UseAlign) const { + unsigned DefClass = DefMCID.getSchedClass(); + unsigned UseClass = UseMCID.getSchedClass(); + + if (DefIdx < DefMCID.getNumDefs() && UseIdx < UseMCID.getNumOperands()) + return ItinData->getOperandLatency(DefClass, DefIdx, UseClass, UseIdx); + + // This may be a def / use of a variable_ops instruction, the operand + // latency might be determinable dynamically. Let the target try to + // figure it out. + int DefCycle = -1; + bool LdmBypass = false; + switch (DefMCID.getOpcode()) { + default: + DefCycle = ItinData->getOperandCycle(DefClass, DefIdx); + break; + + case ARM::VLDMDIA: + case ARM::VLDMDIA_UPD: + case ARM::VLDMDDB_UPD: + case ARM::VLDMSIA: + case ARM::VLDMSIA_UPD: + case ARM::VLDMSDB_UPD: + DefCycle = getVLDMDefCycle(ItinData, DefMCID, DefClass, DefIdx, DefAlign); + break; + + case ARM::LDMIA_RET: + case ARM::LDMIA: + case ARM::LDMDA: + case ARM::LDMDB: + case ARM::LDMIB: + case ARM::LDMIA_UPD: + case ARM::LDMDA_UPD: + case ARM::LDMDB_UPD: + case ARM::LDMIB_UPD: + case ARM::tLDMIA: + case ARM::tLDMIA_UPD: + case ARM::tPUSH: + case ARM::t2LDMIA_RET: + case ARM::t2LDMIA: + case ARM::t2LDMDB: + case ARM::t2LDMIA_UPD: + case ARM::t2LDMDB_UPD: + LdmBypass = 1; + DefCycle = getLDMDefCycle(ItinData, DefMCID, DefClass, DefIdx, DefAlign); + break; + } + + if (DefCycle == -1) + // We can't seem to determine the result latency of the def, assume it's 2. + DefCycle = 2; + + int UseCycle = -1; + switch (UseMCID.getOpcode()) { + default: + UseCycle = ItinData->getOperandCycle(UseClass, UseIdx); + break; + + case ARM::VSTMDIA: + case ARM::VSTMDIA_UPD: + case ARM::VSTMDDB_UPD: + case ARM::VSTMSIA: + case ARM::VSTMSIA_UPD: + case ARM::VSTMSDB_UPD: + UseCycle = getVSTMUseCycle(ItinData, UseMCID, UseClass, UseIdx, UseAlign); + break; + + case ARM::STMIA: + case ARM::STMDA: + case ARM::STMDB: + case ARM::STMIB: + case ARM::STMIA_UPD: + case ARM::STMDA_UPD: + case ARM::STMDB_UPD: + case ARM::STMIB_UPD: + case ARM::tSTMIA_UPD: + case ARM::tPOP_RET: + case ARM::tPOP: + case ARM::t2STMIA: + case ARM::t2STMDB: + case ARM::t2STMIA_UPD: + case ARM::t2STMDB_UPD: + UseCycle = getSTMUseCycle(ItinData, UseMCID, UseClass, UseIdx, UseAlign); + break; + } + + if (UseCycle == -1) + // Assume it's read in the first stage. + UseCycle = 1; + + UseCycle = DefCycle - UseCycle + 1; + if (UseCycle > 0) { + if (LdmBypass) { + // It's a variable_ops instruction so we can't use DefIdx here. Just use + // first def operand. + if (ItinData->hasPipelineForwarding(DefClass, DefMCID.getNumOperands()-1, + UseClass, UseIdx)) + --UseCycle; + } else if (ItinData->hasPipelineForwarding(DefClass, DefIdx, + UseClass, UseIdx)) { + --UseCycle; + } + } + + return UseCycle; +} + +int +ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData, + const MachineInstr *DefMI, unsigned DefIdx, + const MachineInstr *UseMI, unsigned UseIdx) const { + if (DefMI->isCopyLike() || DefMI->isInsertSubreg() || + DefMI->isRegSequence() || DefMI->isImplicitDef()) + return 1; + + const MCInstrDesc &DefMCID = DefMI->getDesc(); + if (!ItinData || ItinData->isEmpty()) + return DefMCID.mayLoad() ? 3 : 1; + + const MCInstrDesc &UseMCID = UseMI->getDesc(); + const MachineOperand &DefMO = DefMI->getOperand(DefIdx); + if (DefMO.getReg() == ARM::CPSR) { + if (DefMI->getOpcode() == ARM::FMSTAT) { + // fpscr -> cpsr stalls over 20 cycles on A8 (and earlier?) + return Subtarget.isCortexA9() ? 1 : 20; + } + + // CPSR set and branch can be paired in the same cycle. + if (UseMCID.isBranch()) + return 0; + } + + unsigned DefAlign = DefMI->hasOneMemOperand() + ? (*DefMI->memoperands_begin())->getAlignment() : 0; + unsigned UseAlign = UseMI->hasOneMemOperand() + ? (*UseMI->memoperands_begin())->getAlignment() : 0; + int Latency = getOperandLatency(ItinData, DefMCID, DefIdx, DefAlign, + UseMCID, UseIdx, UseAlign); + + if (Latency > 1 && + (Subtarget.isCortexA8() || Subtarget.isCortexA9())) { + // FIXME: Shifter op hack: no shift (i.e. [r +/- r]) or [r + r << 2] + // variants are one cycle cheaper. + switch (DefMCID.getOpcode()) { + default: break; + case ARM::LDRrs: + case ARM::LDRBrs: { + unsigned ShOpVal = DefMI->getOperand(3).getImm(); + unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal); + if (ShImm == 0 || + (ShImm == 2 && ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)) + --Latency; + break; + } + case ARM::t2LDRs: + case ARM::t2LDRBs: + case ARM::t2LDRHs: + case ARM::t2LDRSHs: { + // Thumb2 mode: lsl only. + unsigned ShAmt = DefMI->getOperand(3).getImm(); + if (ShAmt == 0 || ShAmt == 2) + --Latency; + break; + } + } + } + + if (DefAlign < 8 && Subtarget.isCortexA9()) + switch (DefMCID.getOpcode()) { + default: break; + case ARM::VLD1q8: + case ARM::VLD1q16: + case ARM::VLD1q32: + case ARM::VLD1q64: + case ARM::VLD1q8_UPD: + case ARM::VLD1q16_UPD: + case ARM::VLD1q32_UPD: + case ARM::VLD1q64_UPD: + case ARM::VLD2d8: + case ARM::VLD2d16: + case ARM::VLD2d32: + case ARM::VLD2q8: + case ARM::VLD2q16: + case ARM::VLD2q32: + case ARM::VLD2d8_UPD: + case ARM::VLD2d16_UPD: + case ARM::VLD2d32_UPD: + case ARM::VLD2q8_UPD: + case ARM::VLD2q16_UPD: + case ARM::VLD2q32_UPD: + case ARM::VLD3d8: + case ARM::VLD3d16: + case ARM::VLD3d32: + case ARM::VLD1d64T: + case ARM::VLD3d8_UPD: + case ARM::VLD3d16_UPD: + case ARM::VLD3d32_UPD: + case ARM::VLD1d64T_UPD: + case ARM::VLD3q8_UPD: + case ARM::VLD3q16_UPD: + case ARM::VLD3q32_UPD: + case ARM::VLD4d8: + case ARM::VLD4d16: + case ARM::VLD4d32: + case ARM::VLD1d64Q: + case ARM::VLD4d8_UPD: + case ARM::VLD4d16_UPD: + case ARM::VLD4d32_UPD: + case ARM::VLD1d64Q_UPD: + case ARM::VLD4q8_UPD: + case ARM::VLD4q16_UPD: + case ARM::VLD4q32_UPD: + case ARM::VLD1DUPq8: + case ARM::VLD1DUPq16: + case ARM::VLD1DUPq32: + case ARM::VLD1DUPq8_UPD: + case ARM::VLD1DUPq16_UPD: + case ARM::VLD1DUPq32_UPD: + case ARM::VLD2DUPd8: + case ARM::VLD2DUPd16: + case ARM::VLD2DUPd32: + case ARM::VLD2DUPd8_UPD: + case ARM::VLD2DUPd16_UPD: + case ARM::VLD2DUPd32_UPD: + case ARM::VLD4DUPd8: + case ARM::VLD4DUPd16: + case ARM::VLD4DUPd32: + case ARM::VLD4DUPd8_UPD: + case ARM::VLD4DUPd16_UPD: + case ARM::VLD4DUPd32_UPD: + case ARM::VLD1LNd8: + case ARM::VLD1LNd16: + case ARM::VLD1LNd32: + case ARM::VLD1LNd8_UPD: + case ARM::VLD1LNd16_UPD: + case ARM::VLD1LNd32_UPD: + case ARM::VLD2LNd8: + case ARM::VLD2LNd16: + case ARM::VLD2LNd32: + case ARM::VLD2LNq16: + case ARM::VLD2LNq32: + case ARM::VLD2LNd8_UPD: + case ARM::VLD2LNd16_UPD: + case ARM::VLD2LNd32_UPD: + case ARM::VLD2LNq16_UPD: + case ARM::VLD2LNq32_UPD: + case ARM::VLD4LNd8: + case ARM::VLD4LNd16: + case ARM::VLD4LNd32: + case ARM::VLD4LNq16: + case ARM::VLD4LNq32: + case ARM::VLD4LNd8_UPD: + case ARM::VLD4LNd16_UPD: + case ARM::VLD4LNd32_UPD: + case ARM::VLD4LNq16_UPD: + case ARM::VLD4LNq32_UPD: + // If the address is not 64-bit aligned, the latencies of these + // instructions increases by one. + ++Latency; + break; + } + + return Latency; +} + +int +ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData, + SDNode *DefNode, unsigned DefIdx, + SDNode *UseNode, unsigned UseIdx) const { + if (!DefNode->isMachineOpcode()) + return 1; + + const MCInstrDesc &DefMCID = get(DefNode->getMachineOpcode()); + + if (isZeroCost(DefMCID.Opcode)) + return 0; + + if (!ItinData || ItinData->isEmpty()) + return DefMCID.mayLoad() ? 3 : 1; + + if (!UseNode->isMachineOpcode()) { + int Latency = ItinData->getOperandCycle(DefMCID.getSchedClass(), DefIdx); + if (Subtarget.isCortexA9()) + return Latency <= 2 ? 1 : Latency - 1; + else + return Latency <= 3 ? 1 : Latency - 2; + } + + const MCInstrDesc &UseMCID = get(UseNode->getMachineOpcode()); + const MachineSDNode *DefMN = dyn_cast<MachineSDNode>(DefNode); + unsigned DefAlign = !DefMN->memoperands_empty() + ? (*DefMN->memoperands_begin())->getAlignment() : 0; + const MachineSDNode *UseMN = dyn_cast<MachineSDNode>(UseNode); + unsigned UseAlign = !UseMN->memoperands_empty() + ? (*UseMN->memoperands_begin())->getAlignment() : 0; + int Latency = getOperandLatency(ItinData, DefMCID, DefIdx, DefAlign, + UseMCID, UseIdx, UseAlign); + + if (Latency > 1 && + (Subtarget.isCortexA8() || Subtarget.isCortexA9())) { + // FIXME: Shifter op hack: no shift (i.e. [r +/- r]) or [r + r << 2] + // variants are one cycle cheaper. + switch (DefMCID.getOpcode()) { + default: break; + case ARM::LDRrs: + case ARM::LDRBrs: { + unsigned ShOpVal = + cast<ConstantSDNode>(DefNode->getOperand(2))->getZExtValue(); + unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal); + if (ShImm == 0 || + (ShImm == 2 && ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)) + --Latency; + break; + } + case ARM::t2LDRs: + case ARM::t2LDRBs: + case ARM::t2LDRHs: + case ARM::t2LDRSHs: { + // Thumb2 mode: lsl only. + unsigned ShAmt = + cast<ConstantSDNode>(DefNode->getOperand(2))->getZExtValue(); + if (ShAmt == 0 || ShAmt == 2) + --Latency; + break; + } + } + } + + if (DefAlign < 8 && Subtarget.isCortexA9()) + switch (DefMCID.getOpcode()) { + default: break; + case ARM::VLD1q8Pseudo: + case ARM::VLD1q16Pseudo: + case ARM::VLD1q32Pseudo: + case ARM::VLD1q64Pseudo: + case ARM::VLD1q8Pseudo_UPD: + case ARM::VLD1q16Pseudo_UPD: + case ARM::VLD1q32Pseudo_UPD: + case ARM::VLD1q64Pseudo_UPD: + case ARM::VLD2d8Pseudo: + case ARM::VLD2d16Pseudo: + case ARM::VLD2d32Pseudo: + case ARM::VLD2q8Pseudo: + case ARM::VLD2q16Pseudo: + case ARM::VLD2q32Pseudo: + case ARM::VLD2d8Pseudo_UPD: + case ARM::VLD2d16Pseudo_UPD: + case ARM::VLD2d32Pseudo_UPD: + case ARM::VLD2q8Pseudo_UPD: + case ARM::VLD2q16Pseudo_UPD: + case ARM::VLD2q32Pseudo_UPD: + case ARM::VLD3d8Pseudo: + case ARM::VLD3d16Pseudo: + case ARM::VLD3d32Pseudo: + case ARM::VLD1d64TPseudo: + case ARM::VLD3d8Pseudo_UPD: + case ARM::VLD3d16Pseudo_UPD: + case ARM::VLD3d32Pseudo_UPD: + case ARM::VLD1d64TPseudo_UPD: + case ARM::VLD3q8Pseudo_UPD: + case ARM::VLD3q16Pseudo_UPD: + case ARM::VLD3q32Pseudo_UPD: + case ARM::VLD3q8oddPseudo: + case ARM::VLD3q16oddPseudo: + case ARM::VLD3q32oddPseudo: + case ARM::VLD3q8oddPseudo_UPD: + case ARM::VLD3q16oddPseudo_UPD: + case ARM::VLD3q32oddPseudo_UPD: + case ARM::VLD4d8Pseudo: + case ARM::VLD4d16Pseudo: + case ARM::VLD4d32Pseudo: + case ARM::VLD1d64QPseudo: + case ARM::VLD4d8Pseudo_UPD: + case ARM::VLD4d16Pseudo_UPD: + case ARM::VLD4d32Pseudo_UPD: + case ARM::VLD1d64QPseudo_UPD: + case ARM::VLD4q8Pseudo_UPD: + case ARM::VLD4q16Pseudo_UPD: + case ARM::VLD4q32Pseudo_UPD: + case ARM::VLD4q8oddPseudo: + case ARM::VLD4q16oddPseudo: + case ARM::VLD4q32oddPseudo: + case ARM::VLD4q8oddPseudo_UPD: + case ARM::VLD4q16oddPseudo_UPD: + case ARM::VLD4q32oddPseudo_UPD: + case ARM::VLD1DUPq8Pseudo: + case ARM::VLD1DUPq16Pseudo: + case ARM::VLD1DUPq32Pseudo: + case ARM::VLD1DUPq8Pseudo_UPD: + case ARM::VLD1DUPq16Pseudo_UPD: + case ARM::VLD1DUPq32Pseudo_UPD: + case ARM::VLD2DUPd8Pseudo: + case ARM::VLD2DUPd16Pseudo: + case ARM::VLD2DUPd32Pseudo: + case ARM::VLD2DUPd8Pseudo_UPD: + case ARM::VLD2DUPd16Pseudo_UPD: + case ARM::VLD2DUPd32Pseudo_UPD: + case ARM::VLD4DUPd8Pseudo: + case ARM::VLD4DUPd16Pseudo: + case ARM::VLD4DUPd32Pseudo: + case ARM::VLD4DUPd8Pseudo_UPD: + case ARM::VLD4DUPd16Pseudo_UPD: + case ARM::VLD4DUPd32Pseudo_UPD: + case ARM::VLD1LNq8Pseudo: + case ARM::VLD1LNq16Pseudo: + case ARM::VLD1LNq32Pseudo: + case ARM::VLD1LNq8Pseudo_UPD: + case ARM::VLD1LNq16Pseudo_UPD: + case ARM::VLD1LNq32Pseudo_UPD: + case ARM::VLD2LNd8Pseudo: + case ARM::VLD2LNd16Pseudo: + case ARM::VLD2LNd32Pseudo: + case ARM::VLD2LNq16Pseudo: + case ARM::VLD2LNq32Pseudo: + case ARM::VLD2LNd8Pseudo_UPD: + case ARM::VLD2LNd16Pseudo_UPD: + case ARM::VLD2LNd32Pseudo_UPD: + case ARM::VLD2LNq16Pseudo_UPD: + case ARM::VLD2LNq32Pseudo_UPD: + case ARM::VLD4LNd8Pseudo: + case ARM::VLD4LNd16Pseudo: + case ARM::VLD4LNd32Pseudo: + case ARM::VLD4LNq16Pseudo: + case ARM::VLD4LNq32Pseudo: + case ARM::VLD4LNd8Pseudo_UPD: + case ARM::VLD4LNd16Pseudo_UPD: + case ARM::VLD4LNd32Pseudo_UPD: + case ARM::VLD4LNq16Pseudo_UPD: + case ARM::VLD4LNq32Pseudo_UPD: + // If the address is not 64-bit aligned, the latencies of these + // instructions increases by one. + ++Latency; + break; + } + + return Latency; +} + +int ARMBaseInstrInfo::getInstrLatency(const InstrItineraryData *ItinData, + const MachineInstr *MI, + unsigned *PredCost) const { + if (MI->isCopyLike() || MI->isInsertSubreg() || + MI->isRegSequence() || MI->isImplicitDef()) + return 1; + + if (!ItinData || ItinData->isEmpty()) + return 1; + + const MCInstrDesc &MCID = MI->getDesc(); + unsigned Class = MCID.getSchedClass(); + unsigned UOps = ItinData->Itineraries[Class].NumMicroOps; + if (PredCost && MCID.hasImplicitDefOfPhysReg(ARM::CPSR)) + // When predicated, CPSR is an additional source operand for CPSR updating + // instructions, this apparently increases their latencies. + *PredCost = 1; + if (UOps) + return ItinData->getStageLatency(Class); + return getNumMicroOps(ItinData, MI); +} + +int ARMBaseInstrInfo::getInstrLatency(const InstrItineraryData *ItinData, + SDNode *Node) const { + if (!Node->isMachineOpcode()) + return 1; + + if (!ItinData || ItinData->isEmpty()) + return 1; + + unsigned Opcode = Node->getMachineOpcode(); + switch (Opcode) { + default: + return ItinData->getStageLatency(get(Opcode).getSchedClass()); + case ARM::VLDMQIA: + case ARM::VSTMQIA: + return 2; + } +} + +bool ARMBaseInstrInfo:: +hasHighOperandLatency(const InstrItineraryData *ItinData, + const MachineRegisterInfo *MRI, + const MachineInstr *DefMI, unsigned DefIdx, + const MachineInstr *UseMI, unsigned UseIdx) const { + unsigned DDomain = DefMI->getDesc().TSFlags & ARMII::DomainMask; + unsigned UDomain = UseMI->getDesc().TSFlags & ARMII::DomainMask; + if (Subtarget.isCortexA8() && + (DDomain == ARMII::DomainVFP || UDomain == ARMII::DomainVFP)) + // CortexA8 VFP instructions are not pipelined. + return true; + + // Hoist VFP / NEON instructions with 4 or higher latency. + int Latency = getOperandLatency(ItinData, DefMI, DefIdx, UseMI, UseIdx); + if (Latency <= 3) + return false; + return DDomain == ARMII::DomainVFP || DDomain == ARMII::DomainNEON || + UDomain == ARMII::DomainVFP || UDomain == ARMII::DomainNEON; +} + +bool ARMBaseInstrInfo:: +hasLowDefLatency(const InstrItineraryData *ItinData, + const MachineInstr *DefMI, unsigned DefIdx) const { + if (!ItinData || ItinData->isEmpty()) + return false; + + unsigned DDomain = DefMI->getDesc().TSFlags & ARMII::DomainMask; + if (DDomain == ARMII::DomainGeneral) { + unsigned DefClass = DefMI->getDesc().getSchedClass(); + int DefCycle = ItinData->getOperandCycle(DefClass, DefIdx); + return (DefCycle != -1 && DefCycle <= 2); + } + return false; +} + +bool ARMBaseInstrInfo::verifyInstruction(const MachineInstr *MI, + StringRef &ErrInfo) const { + if (convertAddSubFlagsOpcode(MI->getOpcode())) { + ErrInfo = "Pseudo flag setting opcodes only exist in Selection DAG"; + return false; + } + return true; +} + +bool +ARMBaseInstrInfo::isFpMLxInstruction(unsigned Opcode, unsigned &MulOpc, + unsigned &AddSubOpc, + bool &NegAcc, bool &HasLane) const { + DenseMap<unsigned, unsigned>::const_iterator I = MLxEntryMap.find(Opcode); + if (I == MLxEntryMap.end()) + return false; + + const ARM_MLxEntry &Entry = ARM_MLxTable[I->second]; + MulOpc = Entry.MulOpc; + AddSubOpc = Entry.AddSubOpc; + NegAcc = Entry.NegAcc; + HasLane = Entry.HasLane; + return true; +} + +//===----------------------------------------------------------------------===// +// Execution domains. +//===----------------------------------------------------------------------===// +// +// Some instructions go down the NEON pipeline, some go down the VFP pipeline, +// and some can go down both. The vmov instructions go down the VFP pipeline, +// but they can be changed to vorr equivalents that are executed by the NEON +// pipeline. +// +// We use the following execution domain numbering: +// +enum ARMExeDomain { + ExeGeneric = 0, + ExeVFP = 1, + ExeNEON = 2 +}; +// +// Also see ARMInstrFormats.td and Domain* enums in ARMBaseInfo.h +// +std::pair<uint16_t, uint16_t> +ARMBaseInstrInfo::getExecutionDomain(const MachineInstr *MI) const { + // VMOVD is a VFP instruction, but can be changed to NEON if it isn't + // predicated. + if (MI->getOpcode() == ARM::VMOVD && !isPredicated(MI)) + return std::make_pair(ExeVFP, (1<<ExeVFP) | (1<<ExeNEON)); + + // No other instructions can be swizzled, so just determine their domain. + unsigned Domain = MI->getDesc().TSFlags & ARMII::DomainMask; + + if (Domain & ARMII::DomainNEON) + return std::make_pair(ExeNEON, 0); + + // Certain instructions can go either way on Cortex-A8. + // Treat them as NEON instructions. + if ((Domain & ARMII::DomainNEONA8) && Subtarget.isCortexA8()) + return std::make_pair(ExeNEON, 0); + + if (Domain & ARMII::DomainVFP) + return std::make_pair(ExeVFP, 0); + + return std::make_pair(ExeGeneric, 0); +} + +void +ARMBaseInstrInfo::setExecutionDomain(MachineInstr *MI, unsigned Domain) const { + // We only know how to change VMOVD into VORR. + assert(MI->getOpcode() == ARM::VMOVD && "Can only swizzle VMOVD"); + if (Domain != ExeNEON) + return; + + // Zap the predicate operands. + assert(!isPredicated(MI) && "Cannot predicate a VORRd"); + MI->RemoveOperand(3); + MI->RemoveOperand(2); + + // Change to a VORRd which requires two identical use operands. + MI->setDesc(get(ARM::VORRd)); + + // Add the extra source operand and new predicates. + // This will go before any implicit ops. + AddDefaultPred(MachineInstrBuilder(MI).addOperand(MI->getOperand(1))); +} |
