//===-- ARMISelDAGToDAG.cpp - A dag to dag inst selector for ARM ----------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file defines an instruction selector for the ARM target. // //===----------------------------------------------------------------------===// #include "ARM.h" #include "ARMBaseInstrInfo.h" #include "ARMTargetMachine.h" #include "MCTargetDesc/ARMAddressingModes.h" #include "Utils/ARMBaseInfo.h" #include "llvm/ADT/StringSwitch.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/SelectionDAG.h" #include "llvm/CodeGen/SelectionDAGISel.h" #include "llvm/CodeGen/TargetLowering.h" #include "llvm/IR/CallingConv.h" #include "llvm/IR/Constants.h" #include "llvm/IR/DerivedTypes.h" #include "llvm/IR/Function.h" #include "llvm/IR/Intrinsics.h" #include "llvm/IR/LLVMContext.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/Debug.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Target/TargetOptions.h" using namespace llvm; #define DEBUG_TYPE "arm-isel" static cl::opt DisableShifterOp("disable-shifter-op", cl::Hidden, cl::desc("Disable isel of shifter-op"), cl::init(false)); //===--------------------------------------------------------------------===// /// ARMDAGToDAGISel - ARM specific code to select ARM machine /// instructions for SelectionDAG operations. /// namespace { class ARMDAGToDAGISel : public SelectionDAGISel { /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can /// make the right decision when generating code for different targets. const ARMSubtarget *Subtarget; public: explicit ARMDAGToDAGISel(ARMBaseTargetMachine &tm, CodeGenOpt::Level OptLevel) : SelectionDAGISel(tm, OptLevel) {} bool runOnMachineFunction(MachineFunction &MF) override { // Reset the subtarget each time through. Subtarget = &MF.getSubtarget(); SelectionDAGISel::runOnMachineFunction(MF); return true; } StringRef getPassName() const override { return "ARM Instruction Selection"; } void PreprocessISelDAG() override; /// getI32Imm - Return a target constant of type i32 with the specified /// value. inline SDValue getI32Imm(unsigned Imm, const SDLoc &dl) { return CurDAG->getTargetConstant(Imm, dl, MVT::i32); } void Select(SDNode *N) override; bool hasNoVMLxHazardUse(SDNode *N) const; bool isShifterOpProfitable(const SDValue &Shift, ARM_AM::ShiftOpc ShOpcVal, unsigned ShAmt); bool SelectRegShifterOperand(SDValue N, SDValue &A, SDValue &B, SDValue &C, bool CheckProfitability = true); bool SelectImmShifterOperand(SDValue N, SDValue &A, SDValue &B, bool CheckProfitability = true); bool SelectShiftRegShifterOperand(SDValue N, SDValue &A, SDValue &B, SDValue &C) { // Don't apply the profitability check return SelectRegShifterOperand(N, A, B, C, false); } bool SelectShiftImmShifterOperand(SDValue N, SDValue &A, SDValue &B) { // Don't apply the profitability check return SelectImmShifterOperand(N, A, B, false); } bool SelectAddrModeImm12(SDValue N, SDValue &Base, SDValue &OffImm); bool SelectLdStSOReg(SDValue N, SDValue &Base, SDValue &Offset, SDValue &Opc); bool SelectCMOVPred(SDValue N, SDValue &Pred, SDValue &Reg) { const ConstantSDNode *CN = cast(N); Pred = CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(N), MVT::i32); Reg = CurDAG->getRegister(ARM::CPSR, MVT::i32); return true; } bool SelectAddrMode2OffsetReg(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc); bool SelectAddrMode2OffsetImm(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc); bool SelectAddrMode2OffsetImmPre(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc); bool SelectAddrOffsetNone(SDValue N, SDValue &Base); bool SelectAddrMode3(SDValue N, SDValue &Base, SDValue &Offset, SDValue &Opc); bool SelectAddrMode3Offset(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc); bool SelectAddrMode5(SDValue N, SDValue &Base, SDValue &Offset); bool SelectAddrMode6(SDNode *Parent, SDValue N, SDValue &Addr,SDValue &Align); bool SelectAddrMode6Offset(SDNode *Op, SDValue N, SDValue &Offset); bool SelectAddrModePC(SDValue N, SDValue &Offset, SDValue &Label); // Thumb Addressing Modes: bool SelectThumbAddrModeRR(SDValue N, SDValue &Base, SDValue &Offset); bool SelectThumbAddrModeImm5S(SDValue N, unsigned Scale, SDValue &Base, SDValue &OffImm); bool SelectThumbAddrModeImm5S1(SDValue N, SDValue &Base, SDValue &OffImm); bool SelectThumbAddrModeImm5S2(SDValue N, SDValue &Base, SDValue &OffImm); bool SelectThumbAddrModeImm5S4(SDValue N, SDValue &Base, SDValue &OffImm); bool SelectThumbAddrModeSP(SDValue N, SDValue &Base, SDValue &OffImm); // Thumb 2 Addressing Modes: bool SelectT2AddrModeImm12(SDValue N, SDValue &Base, SDValue &OffImm); bool SelectT2AddrModeImm8(SDValue N, SDValue &Base, SDValue &OffImm); bool SelectT2AddrModeImm8Offset(SDNode *Op, SDValue N, SDValue &OffImm); bool SelectT2AddrModeSoReg(SDValue N, SDValue &Base, SDValue &OffReg, SDValue &ShImm); bool SelectT2AddrModeExclusive(SDValue N, SDValue &Base, SDValue &OffImm); inline bool is_so_imm(unsigned Imm) const { return ARM_AM::getSOImmVal(Imm) != -1; } inline bool is_so_imm_not(unsigned Imm) const { return ARM_AM::getSOImmVal(~Imm) != -1; } inline bool is_t2_so_imm(unsigned Imm) const { return ARM_AM::getT2SOImmVal(Imm) != -1; } inline bool is_t2_so_imm_not(unsigned Imm) const { return ARM_AM::getT2SOImmVal(~Imm) != -1; } // Include the pieces autogenerated from the target description. #include "ARMGenDAGISel.inc" private: void transferMemOperands(SDNode *Src, SDNode *Dst); /// Indexed (pre/post inc/dec) load matching code for ARM. bool tryARMIndexedLoad(SDNode *N); bool tryT1IndexedLoad(SDNode *N); bool tryT2IndexedLoad(SDNode *N); /// SelectVLD - Select NEON load intrinsics. NumVecs should be /// 1, 2, 3 or 4. The opcode arrays specify the instructions used for /// loads of D registers and even subregs and odd subregs of Q registers. /// For NumVecs <= 2, QOpcodes1 is not used. void SelectVLD(SDNode *N, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes0, const uint16_t *QOpcodes1); /// SelectVST - Select NEON store intrinsics. NumVecs should /// be 1, 2, 3 or 4. The opcode arrays specify the instructions used for /// stores of D registers and even subregs and odd subregs of Q registers. /// For NumVecs <= 2, QOpcodes1 is not used. void SelectVST(SDNode *N, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes0, const uint16_t *QOpcodes1); /// SelectVLDSTLane - Select NEON load/store lane intrinsics. NumVecs should /// be 2, 3 or 4. The opcode arrays specify the instructions used for /// load/store of D registers and Q registers. void SelectVLDSTLane(SDNode *N, bool IsLoad, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes); /// SelectVLDDup - Select NEON load-duplicate intrinsics. NumVecs /// should be 1, 2, 3 or 4. The opcode array specifies the instructions used /// for loading D registers. (Q registers are not supported.) void SelectVLDDup(SDNode *N, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes = nullptr); /// Try to select SBFX/UBFX instructions for ARM. bool tryV6T2BitfieldExtractOp(SDNode *N, bool isSigned); // Select special operations if node forms integer ABS pattern bool tryABSOp(SDNode *N); bool tryReadRegister(SDNode *N); bool tryWriteRegister(SDNode *N); bool tryInlineAsm(SDNode *N); void SelectCMPZ(SDNode *N, bool &SwitchEQNEToPLMI); void SelectCMP_SWAP(SDNode *N); /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for /// inline asm expressions. bool SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID, std::vector &OutOps) override; // Form pairs of consecutive R, S, D, or Q registers. SDNode *createGPRPairNode(EVT VT, SDValue V0, SDValue V1); SDNode *createSRegPairNode(EVT VT, SDValue V0, SDValue V1); SDNode *createDRegPairNode(EVT VT, SDValue V0, SDValue V1); SDNode *createQRegPairNode(EVT VT, SDValue V0, SDValue V1); // Form sequences of 4 consecutive S, D, or Q registers. SDNode *createQuadSRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3); SDNode *createQuadDRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3); SDNode *createQuadQRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3); // Get the alignment operand for a NEON VLD or VST instruction. SDValue GetVLDSTAlign(SDValue Align, const SDLoc &dl, unsigned NumVecs, bool is64BitVector); /// Returns the number of instructions required to materialize the given /// constant in a register, or 3 if a literal pool load is needed. unsigned ConstantMaterializationCost(unsigned Val) const; /// Checks if N is a multiplication by a constant where we can extract out a /// power of two from the constant so that it can be used in a shift, but only /// if it simplifies the materialization of the constant. Returns true if it /// is, and assigns to PowerOfTwo the power of two that should be extracted /// out and to NewMulConst the new constant to be multiplied by. bool canExtractShiftFromMul(const SDValue &N, unsigned MaxShift, unsigned &PowerOfTwo, SDValue &NewMulConst) const; /// Replace N with M in CurDAG, in a way that also ensures that M gets /// selected when N would have been selected. void replaceDAGValue(const SDValue &N, SDValue M); }; } /// isInt32Immediate - This method tests to see if the node is a 32-bit constant /// operand. If so Imm will receive the 32-bit value. static bool isInt32Immediate(SDNode *N, unsigned &Imm) { if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) { Imm = cast(N)->getZExtValue(); return true; } return false; } // isInt32Immediate - This method tests to see if a constant operand. // If so Imm will receive the 32 bit value. static bool isInt32Immediate(SDValue N, unsigned &Imm) { return isInt32Immediate(N.getNode(), Imm); } // isOpcWithIntImmediate - This method tests to see if the node is a specific // opcode and that it has a immediate integer right operand. // If so Imm will receive the 32 bit value. static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) { return N->getOpcode() == Opc && isInt32Immediate(N->getOperand(1).getNode(), Imm); } /// \brief Check whether a particular node is a constant value representable as /// (N * Scale) where (N in [\p RangeMin, \p RangeMax). /// /// \param ScaledConstant [out] - On success, the pre-scaled constant value. static bool isScaledConstantInRange(SDValue Node, int Scale, int RangeMin, int RangeMax, int &ScaledConstant) { assert(Scale > 0 && "Invalid scale!"); // Check that this is a constant. const ConstantSDNode *C = dyn_cast(Node); if (!C) return false; ScaledConstant = (int) C->getZExtValue(); if ((ScaledConstant % Scale) != 0) return false; ScaledConstant /= Scale; return ScaledConstant >= RangeMin && ScaledConstant < RangeMax; } void ARMDAGToDAGISel::PreprocessISelDAG() { if (!Subtarget->hasV6T2Ops()) return; bool isThumb2 = Subtarget->isThumb(); for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(), E = CurDAG->allnodes_end(); I != E; ) { SDNode *N = &*I++; // Preincrement iterator to avoid invalidation issues. if (N->getOpcode() != ISD::ADD) continue; // Look for (add X1, (and (srl X2, c1), c2)) where c2 is constant with // leading zeros, followed by consecutive set bits, followed by 1 or 2 // trailing zeros, e.g. 1020. // Transform the expression to // (add X1, (shl (and (srl X2, c1), (c2>>tz)), tz)) where tz is the number // of trailing zeros of c2. The left shift would be folded as an shifter // operand of 'add' and the 'and' and 'srl' would become a bits extraction // node (UBFX). SDValue N0 = N->getOperand(0); SDValue N1 = N->getOperand(1); unsigned And_imm = 0; if (!isOpcWithIntImmediate(N1.getNode(), ISD::AND, And_imm)) { if (isOpcWithIntImmediate(N0.getNode(), ISD::AND, And_imm)) std::swap(N0, N1); } if (!And_imm) continue; // Check if the AND mask is an immediate of the form: 000.....1111111100 unsigned TZ = countTrailingZeros(And_imm); if (TZ != 1 && TZ != 2) // Be conservative here. Shifter operands aren't always free. e.g. On // Swift, left shifter operand of 1 / 2 for free but others are not. // e.g. // ubfx r3, r1, #16, #8 // ldr.w r3, [r0, r3, lsl #2] // vs. // mov.w r9, #1020 // and.w r2, r9, r1, lsr #14 // ldr r2, [r0, r2] continue; And_imm >>= TZ; if (And_imm & (And_imm + 1)) continue; // Look for (and (srl X, c1), c2). SDValue Srl = N1.getOperand(0); unsigned Srl_imm = 0; if (!isOpcWithIntImmediate(Srl.getNode(), ISD::SRL, Srl_imm) || (Srl_imm <= 2)) continue; // Make sure first operand is not a shifter operand which would prevent // folding of the left shift. SDValue CPTmp0; SDValue CPTmp1; SDValue CPTmp2; if (isThumb2) { if (SelectImmShifterOperand(N0, CPTmp0, CPTmp1)) continue; } else { if (SelectImmShifterOperand(N0, CPTmp0, CPTmp1) || SelectRegShifterOperand(N0, CPTmp0, CPTmp1, CPTmp2)) continue; } // Now make the transformation. Srl = CurDAG->getNode(ISD::SRL, SDLoc(Srl), MVT::i32, Srl.getOperand(0), CurDAG->getConstant(Srl_imm + TZ, SDLoc(Srl), MVT::i32)); N1 = CurDAG->getNode(ISD::AND, SDLoc(N1), MVT::i32, Srl, CurDAG->getConstant(And_imm, SDLoc(Srl), MVT::i32)); N1 = CurDAG->getNode(ISD::SHL, SDLoc(N1), MVT::i32, N1, CurDAG->getConstant(TZ, SDLoc(Srl), MVT::i32)); CurDAG->UpdateNodeOperands(N, N0, N1); } } /// hasNoVMLxHazardUse - Return true if it's desirable to select a FP MLA / MLS /// node. VFP / NEON fp VMLA / VMLS instructions have special RAW hazards (at /// least on current ARM implementations) which should be avoidded. bool ARMDAGToDAGISel::hasNoVMLxHazardUse(SDNode *N) const { if (OptLevel == CodeGenOpt::None) return true; if (!Subtarget->hasVMLxHazards()) return true; if (!N->hasOneUse()) return false; SDNode *Use = *N->use_begin(); if (Use->getOpcode() == ISD::CopyToReg) return true; if (Use->isMachineOpcode()) { const ARMBaseInstrInfo *TII = static_cast( CurDAG->getSubtarget().getInstrInfo()); const MCInstrDesc &MCID = TII->get(Use->getMachineOpcode()); if (MCID.mayStore()) return true; unsigned Opcode = MCID.getOpcode(); if (Opcode == ARM::VMOVRS || Opcode == ARM::VMOVRRD) return true; // vmlx feeding into another vmlx. We actually want to unfold // the use later in the MLxExpansion pass. e.g. // vmla // vmla (stall 8 cycles) // // vmul (5 cycles) // vadd (5 cycles) // vmla // This adds up to about 18 - 19 cycles. // // vmla // vmul (stall 4 cycles) // vadd adds up to about 14 cycles. return TII->isFpMLxInstruction(Opcode); } return false; } bool ARMDAGToDAGISel::isShifterOpProfitable(const SDValue &Shift, ARM_AM::ShiftOpc ShOpcVal, unsigned ShAmt) { if (!Subtarget->isLikeA9() && !Subtarget->isSwift()) return true; if (Shift.hasOneUse()) return true; // R << 2 is free. return ShOpcVal == ARM_AM::lsl && (ShAmt == 2 || (Subtarget->isSwift() && ShAmt == 1)); } unsigned ARMDAGToDAGISel::ConstantMaterializationCost(unsigned Val) const { if (Subtarget->isThumb()) { if (Val <= 255) return 1; // MOV if (Subtarget->hasV6T2Ops() && (Val <= 0xffff || ARM_AM::getT2SOImmValSplatVal(Val) != -1)) return 1; // MOVW if (Val <= 510) return 2; // MOV + ADDi8 if (~Val <= 255) return 2; // MOV + MVN if (ARM_AM::isThumbImmShiftedVal(Val)) return 2; // MOV + LSL } else { if (ARM_AM::getSOImmVal(Val) != -1) return 1; // MOV if (ARM_AM::getSOImmVal(~Val) != -1) return 1; // MVN if (Subtarget->hasV6T2Ops() && Val <= 0xffff) return 1; // MOVW if (ARM_AM::isSOImmTwoPartVal(Val)) return 2; // two instrs } if (Subtarget->useMovt(*MF)) return 2; // MOVW + MOVT return 3; // Literal pool load } bool ARMDAGToDAGISel::canExtractShiftFromMul(const SDValue &N, unsigned MaxShift, unsigned &PowerOfTwo, SDValue &NewMulConst) const { assert(N.getOpcode() == ISD::MUL); assert(MaxShift > 0); // If the multiply is used in more than one place then changing the constant // will make other uses incorrect, so don't. if (!N.hasOneUse()) return false; // Check if the multiply is by a constant ConstantSDNode *MulConst = dyn_cast(N.getOperand(1)); if (!MulConst) return false; // If the constant is used in more than one place then modifying it will mean // we need to materialize two constants instead of one, which is a bad idea. if (!MulConst->hasOneUse()) return false; unsigned MulConstVal = MulConst->getZExtValue(); if (MulConstVal == 0) return false; // Find the largest power of 2 that MulConstVal is a multiple of PowerOfTwo = MaxShift; while ((MulConstVal % (1 << PowerOfTwo)) != 0) { --PowerOfTwo; if (PowerOfTwo == 0) return false; } // Only optimise if the new cost is better unsigned NewMulConstVal = MulConstVal / (1 << PowerOfTwo); NewMulConst = CurDAG->getConstant(NewMulConstVal, SDLoc(N), MVT::i32); unsigned OldCost = ConstantMaterializationCost(MulConstVal); unsigned NewCost = ConstantMaterializationCost(NewMulConstVal); return NewCost < OldCost; } void ARMDAGToDAGISel::replaceDAGValue(const SDValue &N, SDValue M) { CurDAG->RepositionNode(N.getNode()->getIterator(), M.getNode()); CurDAG->ReplaceAllUsesWith(N, M); } bool ARMDAGToDAGISel::SelectImmShifterOperand(SDValue N, SDValue &BaseReg, SDValue &Opc, bool CheckProfitability) { if (DisableShifterOp) return false; // If N is a multiply-by-constant and it's profitable to extract a shift and // use it in a shifted operand do so. if (N.getOpcode() == ISD::MUL) { unsigned PowerOfTwo = 0; SDValue NewMulConst; if (canExtractShiftFromMul(N, 31, PowerOfTwo, NewMulConst)) { HandleSDNode Handle(N); SDLoc Loc(N); replaceDAGValue(N.getOperand(1), NewMulConst); BaseReg = Handle.getValue(); Opc = CurDAG->getTargetConstant( ARM_AM::getSORegOpc(ARM_AM::lsl, PowerOfTwo), Loc, MVT::i32); return true; } } ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOpcode()); // Don't match base register only case. That is matched to a separate // lower complexity pattern with explicit register operand. if (ShOpcVal == ARM_AM::no_shift) return false; BaseReg = N.getOperand(0); unsigned ShImmVal = 0; ConstantSDNode *RHS = dyn_cast(N.getOperand(1)); if (!RHS) return false; ShImmVal = RHS->getZExtValue() & 31; Opc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, ShImmVal), SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectRegShifterOperand(SDValue N, SDValue &BaseReg, SDValue &ShReg, SDValue &Opc, bool CheckProfitability) { if (DisableShifterOp) return false; ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOpcode()); // Don't match base register only case. That is matched to a separate // lower complexity pattern with explicit register operand. if (ShOpcVal == ARM_AM::no_shift) return false; BaseReg = N.getOperand(0); unsigned ShImmVal = 0; ConstantSDNode *RHS = dyn_cast(N.getOperand(1)); if (RHS) return false; ShReg = N.getOperand(1); if (CheckProfitability && !isShifterOpProfitable(N, ShOpcVal, ShImmVal)) return false; Opc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, ShImmVal), SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrModeImm12(SDValue N, SDValue &Base, SDValue &OffImm) { // Match simple R + imm12 operands. // Base only. if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB && !CurDAG->isBaseWithConstantOffset(N)) { if (N.getOpcode() == ISD::FrameIndex) { // Match frame index. int FI = cast(N)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } if (N.getOpcode() == ARMISD::Wrapper && N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress && N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol && N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) { Base = N.getOperand(0); } else Base = N; OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } if (ConstantSDNode *RHS = dyn_cast(N.getOperand(1))) { int RHSC = (int)RHS->getSExtValue(); if (N.getOpcode() == ISD::SUB) RHSC = -RHSC; if (RHSC > -0x1000 && RHSC < 0x1000) { // 12 bits Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32); return true; } } // Base only. Base = N; OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectLdStSOReg(SDValue N, SDValue &Base, SDValue &Offset, SDValue &Opc) { if (N.getOpcode() == ISD::MUL && ((!Subtarget->isLikeA9() && !Subtarget->isSwift()) || N.hasOneUse())) { if (ConstantSDNode *RHS = dyn_cast(N.getOperand(1))) { // X * [3,5,9] -> X + X * [2,4,8] etc. int RHSC = (int)RHS->getZExtValue(); if (RHSC & 1) { RHSC = RHSC & ~1; ARM_AM::AddrOpc AddSub = ARM_AM::add; if (RHSC < 0) { AddSub = ARM_AM::sub; RHSC = - RHSC; } if (isPowerOf2_32(RHSC)) { unsigned ShAmt = Log2_32(RHSC); Base = Offset = N.getOperand(0); Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ARM_AM::lsl), SDLoc(N), MVT::i32); return true; } } } } if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB && // ISD::OR that is equivalent to an ISD::ADD. !CurDAG->isBaseWithConstantOffset(N)) return false; // Leave simple R +/- imm12 operands for LDRi12 if (N.getOpcode() == ISD::ADD || N.getOpcode() == ISD::OR) { int RHSC; if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/1, -0x1000+1, 0x1000, RHSC)) // 12 bits. return false; } // Otherwise this is R +/- [possibly shifted] R. ARM_AM::AddrOpc AddSub = N.getOpcode() == ISD::SUB ? ARM_AM::sub:ARM_AM::add; ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(1).getOpcode()); unsigned ShAmt = 0; Base = N.getOperand(0); Offset = N.getOperand(1); if (ShOpcVal != ARM_AM::no_shift) { // Check to see if the RHS of the shift is a constant, if not, we can't fold // it. if (ConstantSDNode *Sh = dyn_cast(N.getOperand(1).getOperand(1))) { ShAmt = Sh->getZExtValue(); if (isShifterOpProfitable(Offset, ShOpcVal, ShAmt)) Offset = N.getOperand(1).getOperand(0); else { ShAmt = 0; ShOpcVal = ARM_AM::no_shift; } } else { ShOpcVal = ARM_AM::no_shift; } } // Try matching (R shl C) + (R). if (N.getOpcode() != ISD::SUB && ShOpcVal == ARM_AM::no_shift && !(Subtarget->isLikeA9() || Subtarget->isSwift() || N.getOperand(0).hasOneUse())) { ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(0).getOpcode()); if (ShOpcVal != ARM_AM::no_shift) { // Check to see if the RHS of the shift is a constant, if not, we can't // fold it. if (ConstantSDNode *Sh = dyn_cast(N.getOperand(0).getOperand(1))) { ShAmt = Sh->getZExtValue(); if (isShifterOpProfitable(N.getOperand(0), ShOpcVal, ShAmt)) { Offset = N.getOperand(0).getOperand(0); Base = N.getOperand(1); } else { ShAmt = 0; ShOpcVal = ARM_AM::no_shift; } } else { ShOpcVal = ARM_AM::no_shift; } } } // If Offset is a multiply-by-constant and it's profitable to extract a shift // and use it in a shifted operand do so. if (Offset.getOpcode() == ISD::MUL && N.hasOneUse()) { unsigned PowerOfTwo = 0; SDValue NewMulConst; if (canExtractShiftFromMul(Offset, 31, PowerOfTwo, NewMulConst)) { HandleSDNode Handle(Offset); replaceDAGValue(Offset.getOperand(1), NewMulConst); Offset = Handle.getValue(); ShAmt = PowerOfTwo; ShOpcVal = ARM_AM::lsl; } } Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal), SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrMode2OffsetReg(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc) { unsigned Opcode = Op->getOpcode(); ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) ? cast(Op)->getAddressingMode() : cast(Op)->getAddressingMode(); ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC) ? ARM_AM::add : ARM_AM::sub; int Val; if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x1000, Val)) return false; Offset = N; ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOpcode()); unsigned ShAmt = 0; if (ShOpcVal != ARM_AM::no_shift) { // Check to see if the RHS of the shift is a constant, if not, we can't fold // it. if (ConstantSDNode *Sh = dyn_cast(N.getOperand(1))) { ShAmt = Sh->getZExtValue(); if (isShifterOpProfitable(N, ShOpcVal, ShAmt)) Offset = N.getOperand(0); else { ShAmt = 0; ShOpcVal = ARM_AM::no_shift; } } else { ShOpcVal = ARM_AM::no_shift; } } Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal), SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrMode2OffsetImmPre(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc) { unsigned Opcode = Op->getOpcode(); ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) ? cast(Op)->getAddressingMode() : cast(Op)->getAddressingMode(); ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC) ? ARM_AM::add : ARM_AM::sub; int Val; if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x1000, Val)) { // 12 bits. if (AddSub == ARM_AM::sub) Val *= -1; Offset = CurDAG->getRegister(0, MVT::i32); Opc = CurDAG->getTargetConstant(Val, SDLoc(Op), MVT::i32); return true; } return false; } bool ARMDAGToDAGISel::SelectAddrMode2OffsetImm(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc) { unsigned Opcode = Op->getOpcode(); ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) ? cast(Op)->getAddressingMode() : cast(Op)->getAddressingMode(); ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC) ? ARM_AM::add : ARM_AM::sub; int Val; if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x1000, Val)) { // 12 bits. Offset = CurDAG->getRegister(0, MVT::i32); Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, Val, ARM_AM::no_shift), SDLoc(Op), MVT::i32); return true; } return false; } bool ARMDAGToDAGISel::SelectAddrOffsetNone(SDValue N, SDValue &Base) { Base = N; return true; } bool ARMDAGToDAGISel::SelectAddrMode3(SDValue N, SDValue &Base, SDValue &Offset, SDValue &Opc) { if (N.getOpcode() == ISD::SUB) { // X - C is canonicalize to X + -C, no need to handle it here. Base = N.getOperand(0); Offset = N.getOperand(1); Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::sub, 0), SDLoc(N), MVT::i32); return true; } if (!CurDAG->isBaseWithConstantOffset(N)) { Base = N; if (N.getOpcode() == ISD::FrameIndex) { int FI = cast(N)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } Offset = CurDAG->getRegister(0, MVT::i32); Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), SDLoc(N), MVT::i32); return true; } // If the RHS is +/- imm8, fold into addr mode. int RHSC; if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/1, -256 + 1, 256, RHSC)) { // 8 bits. Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } Offset = CurDAG->getRegister(0, MVT::i32); ARM_AM::AddrOpc AddSub = ARM_AM::add; if (RHSC < 0) { AddSub = ARM_AM::sub; RHSC = -RHSC; } Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, RHSC), SDLoc(N), MVT::i32); return true; } Base = N.getOperand(0); Offset = N.getOperand(1); Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrMode3Offset(SDNode *Op, SDValue N, SDValue &Offset, SDValue &Opc) { unsigned Opcode = Op->getOpcode(); ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) ? cast(Op)->getAddressingMode() : cast(Op)->getAddressingMode(); ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC) ? ARM_AM::add : ARM_AM::sub; int Val; if (isScaledConstantInRange(N, /*Scale=*/1, 0, 256, Val)) { // 12 bits. Offset = CurDAG->getRegister(0, MVT::i32); Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, Val), SDLoc(Op), MVT::i32); return true; } Offset = N; Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, 0), SDLoc(Op), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrMode5(SDValue N, SDValue &Base, SDValue &Offset) { if (!CurDAG->isBaseWithConstantOffset(N)) { Base = N; if (N.getOpcode() == ISD::FrameIndex) { int FI = cast(N)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } else if (N.getOpcode() == ARMISD::Wrapper && N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress && N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol && N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) { Base = N.getOperand(0); } Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0), SDLoc(N), MVT::i32); return true; } // If the RHS is +/- imm8, fold into addr mode. int RHSC; if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/4, -256 + 1, 256, RHSC)) { Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } ARM_AM::AddrOpc AddSub = ARM_AM::add; if (RHSC < 0) { AddSub = ARM_AM::sub; RHSC = -RHSC; } Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(AddSub, RHSC), SDLoc(N), MVT::i32); return true; } Base = N; Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0), SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrMode6(SDNode *Parent, SDValue N, SDValue &Addr, SDValue &Align) { Addr = N; unsigned Alignment = 0; MemSDNode *MemN = cast(Parent); if (isa(MemN) || ((MemN->getOpcode() == ARMISD::VST1_UPD || MemN->getOpcode() == ARMISD::VLD1_UPD) && MemN->getConstantOperandVal(MemN->getNumOperands() - 1) == 1)) { // This case occurs only for VLD1-lane/dup and VST1-lane instructions. // The maximum alignment is equal to the memory size being referenced. unsigned MMOAlign = MemN->getAlignment(); unsigned MemSize = MemN->getMemoryVT().getSizeInBits() / 8; if (MMOAlign >= MemSize && MemSize > 1) Alignment = MemSize; } else { // All other uses of addrmode6 are for intrinsics. For now just record // the raw alignment value; it will be refined later based on the legal // alignment operands for the intrinsic. Alignment = MemN->getAlignment(); } Align = CurDAG->getTargetConstant(Alignment, SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectAddrMode6Offset(SDNode *Op, SDValue N, SDValue &Offset) { LSBaseSDNode *LdSt = cast(Op); ISD::MemIndexedMode AM = LdSt->getAddressingMode(); if (AM != ISD::POST_INC) return false; Offset = N; if (ConstantSDNode *NC = dyn_cast(N)) { if (NC->getZExtValue() * 8 == LdSt->getMemoryVT().getSizeInBits()) Offset = CurDAG->getRegister(0, MVT::i32); } return true; } bool ARMDAGToDAGISel::SelectAddrModePC(SDValue N, SDValue &Offset, SDValue &Label) { if (N.getOpcode() == ARMISD::PIC_ADD && N.hasOneUse()) { Offset = N.getOperand(0); SDValue N1 = N.getOperand(1); Label = CurDAG->getTargetConstant(cast(N1)->getZExtValue(), SDLoc(N), MVT::i32); return true; } return false; } //===----------------------------------------------------------------------===// // Thumb Addressing Modes //===----------------------------------------------------------------------===// bool ARMDAGToDAGISel::SelectThumbAddrModeRR(SDValue N, SDValue &Base, SDValue &Offset){ if (N.getOpcode() != ISD::ADD && !CurDAG->isBaseWithConstantOffset(N)) { ConstantSDNode *NC = dyn_cast(N); if (!NC || !NC->isNullValue()) return false; Base = Offset = N; return true; } Base = N.getOperand(0); Offset = N.getOperand(1); return true; } bool ARMDAGToDAGISel::SelectThumbAddrModeImm5S(SDValue N, unsigned Scale, SDValue &Base, SDValue &OffImm) { if (!CurDAG->isBaseWithConstantOffset(N)) { if (N.getOpcode() == ISD::ADD) { return false; // We want to select register offset instead } else if (N.getOpcode() == ARMISD::Wrapper && N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress && N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol && N.getOperand(0).getOpcode() != ISD::TargetConstantPool && N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) { Base = N.getOperand(0); } else { Base = N; } OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } // If the RHS is + imm5 * scale, fold into addr mode. int RHSC; if (isScaledConstantInRange(N.getOperand(1), Scale, 0, 32, RHSC)) { Base = N.getOperand(0); OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32); return true; } // Offset is too large, so use register offset instead. return false; } bool ARMDAGToDAGISel::SelectThumbAddrModeImm5S4(SDValue N, SDValue &Base, SDValue &OffImm) { return SelectThumbAddrModeImm5S(N, 4, Base, OffImm); } bool ARMDAGToDAGISel::SelectThumbAddrModeImm5S2(SDValue N, SDValue &Base, SDValue &OffImm) { return SelectThumbAddrModeImm5S(N, 2, Base, OffImm); } bool ARMDAGToDAGISel::SelectThumbAddrModeImm5S1(SDValue N, SDValue &Base, SDValue &OffImm) { return SelectThumbAddrModeImm5S(N, 1, Base, OffImm); } bool ARMDAGToDAGISel::SelectThumbAddrModeSP(SDValue N, SDValue &Base, SDValue &OffImm) { if (N.getOpcode() == ISD::FrameIndex) { int FI = cast(N)->getIndex(); // Only multiples of 4 are allowed for the offset, so the frame object // alignment must be at least 4. MachineFrameInfo &MFI = MF->getFrameInfo(); if (MFI.getObjectAlignment(FI) < 4) MFI.setObjectAlignment(FI, 4); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } if (!CurDAG->isBaseWithConstantOffset(N)) return false; RegisterSDNode *LHSR = dyn_cast(N.getOperand(0)); if (N.getOperand(0).getOpcode() == ISD::FrameIndex || (LHSR && LHSR->getReg() == ARM::SP)) { // If the RHS is + imm8 * scale, fold into addr mode. int RHSC; if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/4, 0, 256, RHSC)) { Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); // For LHS+RHS to result in an offset that's a multiple of 4 the object // indexed by the LHS must be 4-byte aligned. MachineFrameInfo &MFI = MF->getFrameInfo(); if (MFI.getObjectAlignment(FI) < 4) MFI.setObjectAlignment(FI, 4); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32); return true; } } return false; } //===----------------------------------------------------------------------===// // Thumb 2 Addressing Modes //===----------------------------------------------------------------------===// bool ARMDAGToDAGISel::SelectT2AddrModeImm12(SDValue N, SDValue &Base, SDValue &OffImm) { // Match simple R + imm12 operands. // Base only. if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB && !CurDAG->isBaseWithConstantOffset(N)) { if (N.getOpcode() == ISD::FrameIndex) { // Match frame index. int FI = cast(N)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } if (N.getOpcode() == ARMISD::Wrapper && N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress && N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol && N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) { Base = N.getOperand(0); if (Base.getOpcode() == ISD::TargetConstantPool) return false; // We want to select t2LDRpci instead. } else Base = N; OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } if (ConstantSDNode *RHS = dyn_cast(N.getOperand(1))) { if (SelectT2AddrModeImm8(N, Base, OffImm)) // Let t2LDRi8 handle (R - imm8). return false; int RHSC = (int)RHS->getZExtValue(); if (N.getOpcode() == ISD::SUB) RHSC = -RHSC; if (RHSC >= 0 && RHSC < 0x1000) { // 12 bits (unsigned) Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32); return true; } } // Base only. Base = N; OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectT2AddrModeImm8(SDValue N, SDValue &Base, SDValue &OffImm) { // Match simple R - imm8 operands. if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB && !CurDAG->isBaseWithConstantOffset(N)) return false; if (ConstantSDNode *RHS = dyn_cast(N.getOperand(1))) { int RHSC = (int)RHS->getSExtValue(); if (N.getOpcode() == ISD::SUB) RHSC = -RHSC; if ((RHSC >= -255) && (RHSC < 0)) { // 8 bits (always negative) Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32); return true; } } return false; } bool ARMDAGToDAGISel::SelectT2AddrModeImm8Offset(SDNode *Op, SDValue N, SDValue &OffImm){ unsigned Opcode = Op->getOpcode(); ISD::MemIndexedMode AM = (Opcode == ISD::LOAD) ? cast(Op)->getAddressingMode() : cast(Op)->getAddressingMode(); int RHSC; if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x100, RHSC)) { // 8 bits. OffImm = ((AM == ISD::PRE_INC) || (AM == ISD::POST_INC)) ? CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32) : CurDAG->getTargetConstant(-RHSC, SDLoc(N), MVT::i32); return true; } return false; } bool ARMDAGToDAGISel::SelectT2AddrModeSoReg(SDValue N, SDValue &Base, SDValue &OffReg, SDValue &ShImm) { // (R - imm8) should be handled by t2LDRi8. The rest are handled by t2LDRi12. if (N.getOpcode() != ISD::ADD && !CurDAG->isBaseWithConstantOffset(N)) return false; // Leave (R + imm12) for t2LDRi12, (R - imm8) for t2LDRi8. if (ConstantSDNode *RHS = dyn_cast(N.getOperand(1))) { int RHSC = (int)RHS->getZExtValue(); if (RHSC >= 0 && RHSC < 0x1000) // 12 bits (unsigned) return false; else if (RHSC < 0 && RHSC >= -255) // 8 bits return false; } // Look for (R + R) or (R + (R << [1,2,3])). unsigned ShAmt = 0; Base = N.getOperand(0); OffReg = N.getOperand(1); // Swap if it is ((R << c) + R). ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(OffReg.getOpcode()); if (ShOpcVal != ARM_AM::lsl) { ShOpcVal = ARM_AM::getShiftOpcForNode(Base.getOpcode()); if (ShOpcVal == ARM_AM::lsl) std::swap(Base, OffReg); } if (ShOpcVal == ARM_AM::lsl) { // Check to see if the RHS of the shift is a constant, if not, we can't fold // it. if (ConstantSDNode *Sh = dyn_cast(OffReg.getOperand(1))) { ShAmt = Sh->getZExtValue(); if (ShAmt < 4 && isShifterOpProfitable(OffReg, ShOpcVal, ShAmt)) OffReg = OffReg.getOperand(0); else { ShAmt = 0; } } } // If OffReg is a multiply-by-constant and it's profitable to extract a shift // and use it in a shifted operand do so. if (OffReg.getOpcode() == ISD::MUL && N.hasOneUse()) { unsigned PowerOfTwo = 0; SDValue NewMulConst; if (canExtractShiftFromMul(OffReg, 3, PowerOfTwo, NewMulConst)) { HandleSDNode Handle(OffReg); replaceDAGValue(OffReg.getOperand(1), NewMulConst); OffReg = Handle.getValue(); ShAmt = PowerOfTwo; } } ShImm = CurDAG->getTargetConstant(ShAmt, SDLoc(N), MVT::i32); return true; } bool ARMDAGToDAGISel::SelectT2AddrModeExclusive(SDValue N, SDValue &Base, SDValue &OffImm) { // This *must* succeed since it's used for the irreplaceable ldrex and strex // instructions. Base = N; OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32); if (N.getOpcode() != ISD::ADD || !CurDAG->isBaseWithConstantOffset(N)) return true; ConstantSDNode *RHS = dyn_cast(N.getOperand(1)); if (!RHS) return true; uint32_t RHSC = (int)RHS->getZExtValue(); if (RHSC > 1020 || RHSC % 4 != 0) return true; Base = N.getOperand(0); if (Base.getOpcode() == ISD::FrameIndex) { int FI = cast(Base)->getIndex(); Base = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); } OffImm = CurDAG->getTargetConstant(RHSC/4, SDLoc(N), MVT::i32); return true; } //===--------------------------------------------------------------------===// /// getAL - Returns a ARMCC::AL immediate node. static inline SDValue getAL(SelectionDAG *CurDAG, const SDLoc &dl) { return CurDAG->getTargetConstant((uint64_t)ARMCC::AL, dl, MVT::i32); } void ARMDAGToDAGISel::transferMemOperands(SDNode *N, SDNode *Result) { MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); cast(Result)->setMemRefs(MemOp, MemOp + 1); } bool ARMDAGToDAGISel::tryARMIndexedLoad(SDNode *N) { LoadSDNode *LD = cast(N); ISD::MemIndexedMode AM = LD->getAddressingMode(); if (AM == ISD::UNINDEXED) return false; EVT LoadedVT = LD->getMemoryVT(); SDValue Offset, AMOpc; bool isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC); unsigned Opcode = 0; bool Match = false; if (LoadedVT == MVT::i32 && isPre && SelectAddrMode2OffsetImmPre(N, LD->getOffset(), Offset, AMOpc)) { Opcode = ARM::LDR_PRE_IMM; Match = true; } else if (LoadedVT == MVT::i32 && !isPre && SelectAddrMode2OffsetImm(N, LD->getOffset(), Offset, AMOpc)) { Opcode = ARM::LDR_POST_IMM; Match = true; } else if (LoadedVT == MVT::i32 && SelectAddrMode2OffsetReg(N, LD->getOffset(), Offset, AMOpc)) { Opcode = isPre ? ARM::LDR_PRE_REG : ARM::LDR_POST_REG; Match = true; } else if (LoadedVT == MVT::i16 && SelectAddrMode3Offset(N, LD->getOffset(), Offset, AMOpc)) { Match = true; Opcode = (LD->getExtensionType() == ISD::SEXTLOAD) ? (isPre ? ARM::LDRSH_PRE : ARM::LDRSH_POST) : (isPre ? ARM::LDRH_PRE : ARM::LDRH_POST); } else if (LoadedVT == MVT::i8 || LoadedVT == MVT::i1) { if (LD->getExtensionType() == ISD::SEXTLOAD) { if (SelectAddrMode3Offset(N, LD->getOffset(), Offset, AMOpc)) { Match = true; Opcode = isPre ? ARM::LDRSB_PRE : ARM::LDRSB_POST; } } else { if (isPre && SelectAddrMode2OffsetImmPre(N, LD->getOffset(), Offset, AMOpc)) { Match = true; Opcode = ARM::LDRB_PRE_IMM; } else if (!isPre && SelectAddrMode2OffsetImm(N, LD->getOffset(), Offset, AMOpc)) { Match = true; Opcode = ARM::LDRB_POST_IMM; } else if (SelectAddrMode2OffsetReg(N, LD->getOffset(), Offset, AMOpc)) { Match = true; Opcode = isPre ? ARM::LDRB_PRE_REG : ARM::LDRB_POST_REG; } } } if (Match) { if (Opcode == ARM::LDR_PRE_IMM || Opcode == ARM::LDRB_PRE_IMM) { SDValue Chain = LD->getChain(); SDValue Base = LD->getBasePtr(); SDValue Ops[]= { Base, AMOpc, getAL(CurDAG, SDLoc(N)), CurDAG->getRegister(0, MVT::i32), Chain }; SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), MVT::i32, MVT::i32, MVT::Other, Ops); transferMemOperands(N, New); ReplaceNode(N, New); return true; } else { SDValue Chain = LD->getChain(); SDValue Base = LD->getBasePtr(); SDValue Ops[]= { Base, Offset, AMOpc, getAL(CurDAG, SDLoc(N)), CurDAG->getRegister(0, MVT::i32), Chain }; SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), MVT::i32, MVT::i32, MVT::Other, Ops); transferMemOperands(N, New); ReplaceNode(N, New); return true; } } return false; } bool ARMDAGToDAGISel::tryT1IndexedLoad(SDNode *N) { LoadSDNode *LD = cast(N); EVT LoadedVT = LD->getMemoryVT(); ISD::MemIndexedMode AM = LD->getAddressingMode(); if (AM != ISD::POST_INC || LD->getExtensionType() != ISD::NON_EXTLOAD || LoadedVT.getSimpleVT().SimpleTy != MVT::i32) return false; auto *COffs = dyn_cast(LD->getOffset()); if (!COffs || COffs->getZExtValue() != 4) return false; // A T1 post-indexed load is just a single register LDM: LDM r0!, {r1}. // The encoding of LDM is not how the rest of ISel expects a post-inc load to // look however, so we use a pseudo here and switch it for a tLDMIA_UPD after // ISel. SDValue Chain = LD->getChain(); SDValue Base = LD->getBasePtr(); SDValue Ops[]= { Base, getAL(CurDAG, SDLoc(N)), CurDAG->getRegister(0, MVT::i32), Chain }; SDNode *New = CurDAG->getMachineNode(ARM::tLDR_postidx, SDLoc(N), MVT::i32, MVT::i32, MVT::Other, Ops); transferMemOperands(N, New); ReplaceNode(N, New); return true; } bool ARMDAGToDAGISel::tryT2IndexedLoad(SDNode *N) { LoadSDNode *LD = cast(N); ISD::MemIndexedMode AM = LD->getAddressingMode(); if (AM == ISD::UNINDEXED) return false; EVT LoadedVT = LD->getMemoryVT(); bool isSExtLd = LD->getExtensionType() == ISD::SEXTLOAD; SDValue Offset; bool isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC); unsigned Opcode = 0; bool Match = false; if (SelectT2AddrModeImm8Offset(N, LD->getOffset(), Offset)) { switch (LoadedVT.getSimpleVT().SimpleTy) { case MVT::i32: Opcode = isPre ? ARM::t2LDR_PRE : ARM::t2LDR_POST; break; case MVT::i16: if (isSExtLd) Opcode = isPre ? ARM::t2LDRSH_PRE : ARM::t2LDRSH_POST; else Opcode = isPre ? ARM::t2LDRH_PRE : ARM::t2LDRH_POST; break; case MVT::i8: case MVT::i1: if (isSExtLd) Opcode = isPre ? ARM::t2LDRSB_PRE : ARM::t2LDRSB_POST; else Opcode = isPre ? ARM::t2LDRB_PRE : ARM::t2LDRB_POST; break; default: return false; } Match = true; } if (Match) { SDValue Chain = LD->getChain(); SDValue Base = LD->getBasePtr(); SDValue Ops[]= { Base, Offset, getAL(CurDAG, SDLoc(N)), CurDAG->getRegister(0, MVT::i32), Chain }; SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), MVT::i32, MVT::i32, MVT::Other, Ops); transferMemOperands(N, New); ReplaceNode(N, New); return true; } return false; } /// \brief Form a GPRPair pseudo register from a pair of GPR regs. SDNode *ARMDAGToDAGISel::createGPRPairNode(EVT VT, SDValue V0, SDValue V1) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::GPRPairRegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::gsub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::gsub_1, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// \brief Form a D register from a pair of S registers. SDNode *ARMDAGToDAGISel::createSRegPairNode(EVT VT, SDValue V0, SDValue V1) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::DPR_VFP2RegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::ssub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::ssub_1, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// \brief Form a quad register from a pair of D registers. SDNode *ARMDAGToDAGISel::createDRegPairNode(EVT VT, SDValue V0, SDValue V1) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::QPRRegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::dsub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::dsub_1, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// \brief Form 4 consecutive D registers from a pair of Q registers. SDNode *ARMDAGToDAGISel::createQRegPairNode(EVT VT, SDValue V0, SDValue V1) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::QQPRRegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::qsub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::qsub_1, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// \brief Form 4 consecutive S registers. SDNode *ARMDAGToDAGISel::createQuadSRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::QPR_VFP2RegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::ssub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::ssub_1, dl, MVT::i32); SDValue SubReg2 = CurDAG->getTargetConstant(ARM::ssub_2, dl, MVT::i32); SDValue SubReg3 = CurDAG->getTargetConstant(ARM::ssub_3, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1, V2, SubReg2, V3, SubReg3 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// \brief Form 4 consecutive D registers. SDNode *ARMDAGToDAGISel::createQuadDRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::QQPRRegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::dsub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::dsub_1, dl, MVT::i32); SDValue SubReg2 = CurDAG->getTargetConstant(ARM::dsub_2, dl, MVT::i32); SDValue SubReg3 = CurDAG->getTargetConstant(ARM::dsub_3, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1, V2, SubReg2, V3, SubReg3 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// \brief Form 4 consecutive Q registers. SDNode *ARMDAGToDAGISel::createQuadQRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3) { SDLoc dl(V0.getNode()); SDValue RegClass = CurDAG->getTargetConstant(ARM::QQQQPRRegClassID, dl, MVT::i32); SDValue SubReg0 = CurDAG->getTargetConstant(ARM::qsub_0, dl, MVT::i32); SDValue SubReg1 = CurDAG->getTargetConstant(ARM::qsub_1, dl, MVT::i32); SDValue SubReg2 = CurDAG->getTargetConstant(ARM::qsub_2, dl, MVT::i32); SDValue SubReg3 = CurDAG->getTargetConstant(ARM::qsub_3, dl, MVT::i32); const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1, V2, SubReg2, V3, SubReg3 }; return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops); } /// GetVLDSTAlign - Get the alignment (in bytes) for the alignment operand /// of a NEON VLD or VST instruction. The supported values depend on the /// number of registers being loaded. SDValue ARMDAGToDAGISel::GetVLDSTAlign(SDValue Align, const SDLoc &dl, unsigned NumVecs, bool is64BitVector) { unsigned NumRegs = NumVecs; if (!is64BitVector && NumVecs < 3) NumRegs *= 2; unsigned Alignment = cast(Align)->getZExtValue(); if (Alignment >= 32 && NumRegs == 4) Alignment = 32; else if (Alignment >= 16 && (NumRegs == 2 || NumRegs == 4)) Alignment = 16; else if (Alignment >= 8) Alignment = 8; else Alignment = 0; return CurDAG->getTargetConstant(Alignment, dl, MVT::i32); } static bool isVLDfixed(unsigned Opc) { switch (Opc) { default: return false; case ARM::VLD1d8wb_fixed : return true; case ARM::VLD1d16wb_fixed : return true; case ARM::VLD1d64Qwb_fixed : return true; case ARM::VLD1d32wb_fixed : return true; case ARM::VLD1d64wb_fixed : return true; case ARM::VLD1d64TPseudoWB_fixed : return true; case ARM::VLD1d64QPseudoWB_fixed : return true; case ARM::VLD1q8wb_fixed : return true; case ARM::VLD1q16wb_fixed : return true; case ARM::VLD1q32wb_fixed : return true; case ARM::VLD1q64wb_fixed : return true; case ARM::VLD1DUPd8wb_fixed : return true; case ARM::VLD1DUPd16wb_fixed : return true; case ARM::VLD1DUPd32wb_fixed : return true; case ARM::VLD1DUPq8wb_fixed : return true; case ARM::VLD1DUPq16wb_fixed : return true; case ARM::VLD1DUPq32wb_fixed : return true; case ARM::VLD2d8wb_fixed : return true; case ARM::VLD2d16wb_fixed : return true; case ARM::VLD2d32wb_fixed : return true; case ARM::VLD2q8PseudoWB_fixed : return true; case ARM::VLD2q16PseudoWB_fixed : return true; case ARM::VLD2q32PseudoWB_fixed : return true; case ARM::VLD2DUPd8wb_fixed : return true; case ARM::VLD2DUPd16wb_fixed : return true; case ARM::VLD2DUPd32wb_fixed : return true; } } static bool isVSTfixed(unsigned Opc) { switch (Opc) { default: return false; case ARM::VST1d8wb_fixed : return true; case ARM::VST1d16wb_fixed : return true; case ARM::VST1d32wb_fixed : return true; case ARM::VST1d64wb_fixed : return true; case ARM::VST1q8wb_fixed : return true; case ARM::VST1q16wb_fixed : return true; case ARM::VST1q32wb_fixed : return true; case ARM::VST1q64wb_fixed : return true; case ARM::VST1d64TPseudoWB_fixed : return true; case ARM::VST1d64QPseudoWB_fixed : return true; case ARM::VST2d8wb_fixed : return true; case ARM::VST2d16wb_fixed : return true; case ARM::VST2d32wb_fixed : return true; case ARM::VST2q8PseudoWB_fixed : return true; case ARM::VST2q16PseudoWB_fixed : return true; case ARM::VST2q32PseudoWB_fixed : return true; } } // Get the register stride update opcode of a VLD/VST instruction that // is otherwise equivalent to the given fixed stride updating instruction. static unsigned getVLDSTRegisterUpdateOpcode(unsigned Opc) { assert((isVLDfixed(Opc) || isVSTfixed(Opc)) && "Incorrect fixed stride updating instruction."); switch (Opc) { default: break; case ARM::VLD1d8wb_fixed: return ARM::VLD1d8wb_register; case ARM::VLD1d16wb_fixed: return ARM::VLD1d16wb_register; case ARM::VLD1d32wb_fixed: return ARM::VLD1d32wb_register; case ARM::VLD1d64wb_fixed: return ARM::VLD1d64wb_register; case ARM::VLD1q8wb_fixed: return ARM::VLD1q8wb_register; case ARM::VLD1q16wb_fixed: return ARM::VLD1q16wb_register; case ARM::VLD1q32wb_fixed: return ARM::VLD1q32wb_register; case ARM::VLD1q64wb_fixed: return ARM::VLD1q64wb_register; case ARM::VLD1d64Twb_fixed: return ARM::VLD1d64Twb_register; case ARM::VLD1d64Qwb_fixed: return ARM::VLD1d64Qwb_register; case ARM::VLD1d64TPseudoWB_fixed: return ARM::VLD1d64TPseudoWB_register; case ARM::VLD1d64QPseudoWB_fixed: return ARM::VLD1d64QPseudoWB_register; case ARM::VLD1DUPd8wb_fixed : return ARM::VLD1DUPd8wb_register; case ARM::VLD1DUPd16wb_fixed : return ARM::VLD1DUPd16wb_register; case ARM::VLD1DUPd32wb_fixed : return ARM::VLD1DUPd32wb_register; case ARM::VLD1DUPq8wb_fixed : return ARM::VLD1DUPq8wb_register; case ARM::VLD1DUPq16wb_fixed : return ARM::VLD1DUPq16wb_register; case ARM::VLD1DUPq32wb_fixed : return ARM::VLD1DUPq32wb_register; case ARM::VST1d8wb_fixed: return ARM::VST1d8wb_register; case ARM::VST1d16wb_fixed: return ARM::VST1d16wb_register; case ARM::VST1d32wb_fixed: return ARM::VST1d32wb_register; case ARM::VST1d64wb_fixed: return ARM::VST1d64wb_register; case ARM::VST1q8wb_fixed: return ARM::VST1q8wb_register; case ARM::VST1q16wb_fixed: return ARM::VST1q16wb_register; case ARM::VST1q32wb_fixed: return ARM::VST1q32wb_register; case ARM::VST1q64wb_fixed: return ARM::VST1q64wb_register; case ARM::VST1d64TPseudoWB_fixed: return ARM::VST1d64TPseudoWB_register; case ARM::VST1d64QPseudoWB_fixed: return ARM::VST1d64QPseudoWB_register; case ARM::VLD2d8wb_fixed: return ARM::VLD2d8wb_register; case ARM::VLD2d16wb_fixed: return ARM::VLD2d16wb_register; case ARM::VLD2d32wb_fixed: return ARM::VLD2d32wb_register; case ARM::VLD2q8PseudoWB_fixed: return ARM::VLD2q8PseudoWB_register; case ARM::VLD2q16PseudoWB_fixed: return ARM::VLD2q16PseudoWB_register; case ARM::VLD2q32PseudoWB_fixed: return ARM::VLD2q32PseudoWB_register; case ARM::VST2d8wb_fixed: return ARM::VST2d8wb_register; case ARM::VST2d16wb_fixed: return ARM::VST2d16wb_register; case ARM::VST2d32wb_fixed: return ARM::VST2d32wb_register; case ARM::VST2q8PseudoWB_fixed: return ARM::VST2q8PseudoWB_register; case ARM::VST2q16PseudoWB_fixed: return ARM::VST2q16PseudoWB_register; case ARM::VST2q32PseudoWB_fixed: return ARM::VST2q32PseudoWB_register; case ARM::VLD2DUPd8wb_fixed: return ARM::VLD2DUPd8wb_register; case ARM::VLD2DUPd16wb_fixed: return ARM::VLD2DUPd16wb_register; case ARM::VLD2DUPd32wb_fixed: return ARM::VLD2DUPd32wb_register; } return Opc; // If not one we handle, return it unchanged. } /// Returns true if the given increment is a Constant known to be equal to the /// access size performed by a NEON load/store. This means the "[rN]!" form can /// be used. static bool isPerfectIncrement(SDValue Inc, EVT VecTy, unsigned NumVecs) { auto C = dyn_cast(Inc); return C && C->getZExtValue() == VecTy.getSizeInBits() / 8 * NumVecs; } void ARMDAGToDAGISel::SelectVLD(SDNode *N, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes0, const uint16_t *QOpcodes1) { assert(NumVecs >= 1 && NumVecs <= 4 && "VLD NumVecs out-of-range"); SDLoc dl(N); SDValue MemAddr, Align; unsigned AddrOpIdx = isUpdating ? 1 : 2; if (!SelectAddrMode6(N, N->getOperand(AddrOpIdx), MemAddr, Align)) return; SDValue Chain = N->getOperand(0); EVT VT = N->getValueType(0); bool is64BitVector = VT.is64BitVector(); Align = GetVLDSTAlign(Align, dl, NumVecs, is64BitVector); unsigned OpcodeIndex; switch (VT.getSimpleVT().SimpleTy) { default: llvm_unreachable("unhandled vld type"); // Double-register operations: case MVT::v8i8: OpcodeIndex = 0; break; case MVT::v4i16: OpcodeIndex = 1; break; case MVT::v2f32: case MVT::v2i32: OpcodeIndex = 2; break; case MVT::v1i64: OpcodeIndex = 3; break; // Quad-register operations: case MVT::v16i8: OpcodeIndex = 0; break; case MVT::v8i16: OpcodeIndex = 1; break; case MVT::v4f32: case MVT::v4i32: OpcodeIndex = 2; break; case MVT::v2f64: case MVT::v2i64: OpcodeIndex = 3; assert(NumVecs == 1 && "v2i64 type only supported for VLD1"); break; } EVT ResTy; if (NumVecs == 1) ResTy = VT; else { unsigned ResTyElts = (NumVecs == 3) ? 4 : NumVecs; if (!is64BitVector) ResTyElts *= 2; ResTy = EVT::getVectorVT(*CurDAG->getContext(), MVT::i64, ResTyElts); } std::vector ResTys; ResTys.push_back(ResTy); if (isUpdating) ResTys.push_back(MVT::i32); ResTys.push_back(MVT::Other); SDValue Pred = getAL(CurDAG, dl); SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SDNode *VLd; SmallVector Ops; // Double registers and VLD1/VLD2 quad registers are directly supported. if (is64BitVector || NumVecs <= 2) { unsigned Opc = (is64BitVector ? DOpcodes[OpcodeIndex] : QOpcodes0[OpcodeIndex]); Ops.push_back(MemAddr); Ops.push_back(Align); if (isUpdating) { SDValue Inc = N->getOperand(AddrOpIdx + 1); // FIXME: VLD1/VLD2 fixed increment doesn't need Reg0. Remove the reg0 // case entirely when the rest are updated to that form, too. bool IsImmUpdate = isPerfectIncrement(Inc, VT, NumVecs); if ((NumVecs <= 2) && !IsImmUpdate) Opc = getVLDSTRegisterUpdateOpcode(Opc); // FIXME: We use a VLD1 for v1i64 even if the pseudo says vld2/3/4, so // check for that explicitly too. Horribly hacky, but temporary. if ((NumVecs > 2 && !isVLDfixed(Opc)) || !IsImmUpdate) Ops.push_back(IsImmUpdate ? Reg0 : Inc); } Ops.push_back(Pred); Ops.push_back(Reg0); Ops.push_back(Chain); VLd = CurDAG->getMachineNode(Opc, dl, ResTys, Ops); } else { // Otherwise, quad registers are loaded with two separate instructions, // where one loads the even registers and the other loads the odd registers. EVT AddrTy = MemAddr.getValueType(); // Load the even subregs. This is always an updating load, so that it // provides the address to the second load for the odd subregs. SDValue ImplDef = SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, dl, ResTy), 0); const SDValue OpsA[] = { MemAddr, Align, Reg0, ImplDef, Pred, Reg0, Chain }; SDNode *VLdA = CurDAG->getMachineNode(QOpcodes0[OpcodeIndex], dl, ResTy, AddrTy, MVT::Other, OpsA); Chain = SDValue(VLdA, 2); // Load the odd subregs. Ops.push_back(SDValue(VLdA, 1)); Ops.push_back(Align); if (isUpdating) { SDValue Inc = N->getOperand(AddrOpIdx + 1); assert(isa(Inc.getNode()) && "only constant post-increment update allowed for VLD3/4"); (void)Inc; Ops.push_back(Reg0); } Ops.push_back(SDValue(VLdA, 0)); Ops.push_back(Pred); Ops.push_back(Reg0); Ops.push_back(Chain); VLd = CurDAG->getMachineNode(QOpcodes1[OpcodeIndex], dl, ResTys, Ops); } // Transfer memoperands. MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); cast(VLd)->setMemRefs(MemOp, MemOp + 1); if (NumVecs == 1) { ReplaceNode(N, VLd); return; } // Extract out the subregisters. SDValue SuperReg = SDValue(VLd, 0); static_assert(ARM::dsub_7 == ARM::dsub_0 + 7 && ARM::qsub_3 == ARM::qsub_0 + 3, "Unexpected subreg numbering"); unsigned Sub0 = (is64BitVector ? ARM::dsub_0 : ARM::qsub_0); for (unsigned Vec = 0; Vec < NumVecs; ++Vec) ReplaceUses(SDValue(N, Vec), CurDAG->getTargetExtractSubreg(Sub0 + Vec, dl, VT, SuperReg)); ReplaceUses(SDValue(N, NumVecs), SDValue(VLd, 1)); if (isUpdating) ReplaceUses(SDValue(N, NumVecs + 1), SDValue(VLd, 2)); CurDAG->RemoveDeadNode(N); } void ARMDAGToDAGISel::SelectVST(SDNode *N, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes0, const uint16_t *QOpcodes1) { assert(NumVecs >= 1 && NumVecs <= 4 && "VST NumVecs out-of-range"); SDLoc dl(N); SDValue MemAddr, Align; unsigned AddrOpIdx = isUpdating ? 1 : 2; unsigned Vec0Idx = 3; // AddrOpIdx + (isUpdating ? 2 : 1) if (!SelectAddrMode6(N, N->getOperand(AddrOpIdx), MemAddr, Align)) return; MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); SDValue Chain = N->getOperand(0); EVT VT = N->getOperand(Vec0Idx).getValueType(); bool is64BitVector = VT.is64BitVector(); Align = GetVLDSTAlign(Align, dl, NumVecs, is64BitVector); unsigned OpcodeIndex; switch (VT.getSimpleVT().SimpleTy) { default: llvm_unreachable("unhandled vst type"); // Double-register operations: case MVT::v8i8: OpcodeIndex = 0; break; case MVT::v4i16: OpcodeIndex = 1; break; case MVT::v2f32: case MVT::v2i32: OpcodeIndex = 2; break; case MVT::v1i64: OpcodeIndex = 3; break; // Quad-register operations: case MVT::v16i8: OpcodeIndex = 0; break; case MVT::v8i16: OpcodeIndex = 1; break; case MVT::v4f32: case MVT::v4i32: OpcodeIndex = 2; break; case MVT::v2f64: case MVT::v2i64: OpcodeIndex = 3; assert(NumVecs == 1 && "v2i64 type only supported for VST1"); break; } std::vector ResTys; if (isUpdating) ResTys.push_back(MVT::i32); ResTys.push_back(MVT::Other); SDValue Pred = getAL(CurDAG, dl); SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SmallVector Ops; // Double registers and VST1/VST2 quad registers are directly supported. if (is64BitVector || NumVecs <= 2) { SDValue SrcReg; if (NumVecs == 1) { SrcReg = N->getOperand(Vec0Idx); } else if (is64BitVector) { // Form a REG_SEQUENCE to force register allocation. SDValue V0 = N->getOperand(Vec0Idx + 0); SDValue V1 = N->getOperand(Vec0Idx + 1); if (NumVecs == 2) SrcReg = SDValue(createDRegPairNode(MVT::v2i64, V0, V1), 0); else { SDValue V2 = N->getOperand(Vec0Idx + 2); // If it's a vst3, form a quad D-register and leave the last part as // an undef. SDValue V3 = (NumVecs == 3) ? SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,dl,VT), 0) : N->getOperand(Vec0Idx + 3); SrcReg = SDValue(createQuadDRegsNode(MVT::v4i64, V0, V1, V2, V3), 0); } } else { // Form a QQ register. SDValue Q0 = N->getOperand(Vec0Idx); SDValue Q1 = N->getOperand(Vec0Idx + 1); SrcReg = SDValue(createQRegPairNode(MVT::v4i64, Q0, Q1), 0); } unsigned Opc = (is64BitVector ? DOpcodes[OpcodeIndex] : QOpcodes0[OpcodeIndex]); Ops.push_back(MemAddr); Ops.push_back(Align); if (isUpdating) { SDValue Inc = N->getOperand(AddrOpIdx + 1); // FIXME: VST1/VST2 fixed increment doesn't need Reg0. Remove the reg0 // case entirely when the rest are updated to that form, too. bool IsImmUpdate = isPerfectIncrement(Inc, VT, NumVecs); if (NumVecs <= 2 && !IsImmUpdate) Opc = getVLDSTRegisterUpdateOpcode(Opc); // FIXME: We use a VST1 for v1i64 even if the pseudo says vld2/3/4, so // check for that explicitly too. Horribly hacky, but temporary. if (!IsImmUpdate) Ops.push_back(Inc); else if (NumVecs > 2 && !isVSTfixed(Opc)) Ops.push_back(Reg0); } Ops.push_back(SrcReg); Ops.push_back(Pred); Ops.push_back(Reg0); Ops.push_back(Chain); SDNode *VSt = CurDAG->getMachineNode(Opc, dl, ResTys, Ops); // Transfer memoperands. cast(VSt)->setMemRefs(MemOp, MemOp + 1); ReplaceNode(N, VSt); return; } // Otherwise, quad registers are stored with two separate instructions, // where one stores the even registers and the other stores the odd registers. // Form the QQQQ REG_SEQUENCE. SDValue V0 = N->getOperand(Vec0Idx + 0); SDValue V1 = N->getOperand(Vec0Idx + 1); SDValue V2 = N->getOperand(Vec0Idx + 2); SDValue V3 = (NumVecs == 3) ? SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, dl, VT), 0) : N->getOperand(Vec0Idx + 3); SDValue RegSeq = SDValue(createQuadQRegsNode(MVT::v8i64, V0, V1, V2, V3), 0); // Store the even D registers. This is always an updating store, so that it // provides the address to the second store for the odd subregs. const SDValue OpsA[] = { MemAddr, Align, Reg0, RegSeq, Pred, Reg0, Chain }; SDNode *VStA = CurDAG->getMachineNode(QOpcodes0[OpcodeIndex], dl, MemAddr.getValueType(), MVT::Other, OpsA); cast(VStA)->setMemRefs(MemOp, MemOp + 1); Chain = SDValue(VStA, 1); // Store the odd D registers. Ops.push_back(SDValue(VStA, 0)); Ops.push_back(Align); if (isUpdating) { SDValue Inc = N->getOperand(AddrOpIdx + 1); assert(isa(Inc.getNode()) && "only constant post-increment update allowed for VST3/4"); (void)Inc; Ops.push_back(Reg0); } Ops.push_back(RegSeq); Ops.push_back(Pred); Ops.push_back(Reg0); Ops.push_back(Chain); SDNode *VStB = CurDAG->getMachineNode(QOpcodes1[OpcodeIndex], dl, ResTys, Ops); cast(VStB)->setMemRefs(MemOp, MemOp + 1); ReplaceNode(N, VStB); } void ARMDAGToDAGISel::SelectVLDSTLane(SDNode *N, bool IsLoad, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes) { assert(NumVecs >=2 && NumVecs <= 4 && "VLDSTLane NumVecs out-of-range"); SDLoc dl(N); SDValue MemAddr, Align; unsigned AddrOpIdx = isUpdating ? 1 : 2; unsigned Vec0Idx = 3; // AddrOpIdx + (isUpdating ? 2 : 1) if (!SelectAddrMode6(N, N->getOperand(AddrOpIdx), MemAddr, Align)) return; MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); SDValue Chain = N->getOperand(0); unsigned Lane = cast(N->getOperand(Vec0Idx + NumVecs))->getZExtValue(); EVT VT = N->getOperand(Vec0Idx).getValueType(); bool is64BitVector = VT.is64BitVector(); unsigned Alignment = 0; if (NumVecs != 3) { Alignment = cast(Align)->getZExtValue(); unsigned NumBytes = NumVecs * VT.getScalarSizeInBits() / 8; if (Alignment > NumBytes) Alignment = NumBytes; if (Alignment < 8 && Alignment < NumBytes) Alignment = 0; // Alignment must be a power of two; make sure of that. Alignment = (Alignment & -Alignment); if (Alignment == 1) Alignment = 0; } Align = CurDAG->getTargetConstant(Alignment, dl, MVT::i32); unsigned OpcodeIndex; switch (VT.getSimpleVT().SimpleTy) { default: llvm_unreachable("unhandled vld/vst lane type"); // Double-register operations: case MVT::v8i8: OpcodeIndex = 0; break; case MVT::v4i16: OpcodeIndex = 1; break; case MVT::v2f32: case MVT::v2i32: OpcodeIndex = 2; break; // Quad-register operations: case MVT::v8i16: OpcodeIndex = 0; break; case MVT::v4f32: case MVT::v4i32: OpcodeIndex = 1; break; } std::vector ResTys; if (IsLoad) { unsigned ResTyElts = (NumVecs == 3) ? 4 : NumVecs; if (!is64BitVector) ResTyElts *= 2; ResTys.push_back(EVT::getVectorVT(*CurDAG->getContext(), MVT::i64, ResTyElts)); } if (isUpdating) ResTys.push_back(MVT::i32); ResTys.push_back(MVT::Other); SDValue Pred = getAL(CurDAG, dl); SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SmallVector Ops; Ops.push_back(MemAddr); Ops.push_back(Align); if (isUpdating) { SDValue Inc = N->getOperand(AddrOpIdx + 1); bool IsImmUpdate = isPerfectIncrement(Inc, VT.getVectorElementType(), NumVecs); Ops.push_back(IsImmUpdate ? Reg0 : Inc); } SDValue SuperReg; SDValue V0 = N->getOperand(Vec0Idx + 0); SDValue V1 = N->getOperand(Vec0Idx + 1); if (NumVecs == 2) { if (is64BitVector) SuperReg = SDValue(createDRegPairNode(MVT::v2i64, V0, V1), 0); else SuperReg = SDValue(createQRegPairNode(MVT::v4i64, V0, V1), 0); } else { SDValue V2 = N->getOperand(Vec0Idx + 2); SDValue V3 = (NumVecs == 3) ? SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, dl, VT), 0) : N->getOperand(Vec0Idx + 3); if (is64BitVector) SuperReg = SDValue(createQuadDRegsNode(MVT::v4i64, V0, V1, V2, V3), 0); else SuperReg = SDValue(createQuadQRegsNode(MVT::v8i64, V0, V1, V2, V3), 0); } Ops.push_back(SuperReg); Ops.push_back(getI32Imm(Lane, dl)); Ops.push_back(Pred); Ops.push_back(Reg0); Ops.push_back(Chain); unsigned Opc = (is64BitVector ? DOpcodes[OpcodeIndex] : QOpcodes[OpcodeIndex]); SDNode *VLdLn = CurDAG->getMachineNode(Opc, dl, ResTys, Ops); cast(VLdLn)->setMemRefs(MemOp, MemOp + 1); if (!IsLoad) { ReplaceNode(N, VLdLn); return; } // Extract the subregisters. SuperReg = SDValue(VLdLn, 0); static_assert(ARM::dsub_7 == ARM::dsub_0 + 7 && ARM::qsub_3 == ARM::qsub_0 + 3, "Unexpected subreg numbering"); unsigned Sub0 = is64BitVector ? ARM::dsub_0 : ARM::qsub_0; for (unsigned Vec = 0; Vec < NumVecs; ++Vec) ReplaceUses(SDValue(N, Vec), CurDAG->getTargetExtractSubreg(Sub0 + Vec, dl, VT, SuperReg)); ReplaceUses(SDValue(N, NumVecs), SDValue(VLdLn, 1)); if (isUpdating) ReplaceUses(SDValue(N, NumVecs + 1), SDValue(VLdLn, 2)); CurDAG->RemoveDeadNode(N); } void ARMDAGToDAGISel::SelectVLDDup(SDNode *N, bool isUpdating, unsigned NumVecs, const uint16_t *DOpcodes, const uint16_t *QOpcodes) { assert(NumVecs >= 1 && NumVecs <= 4 && "VLDDup NumVecs out-of-range"); SDLoc dl(N); SDValue MemAddr, Align; if (!SelectAddrMode6(N, N->getOperand(1), MemAddr, Align)) return; MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); SDValue Chain = N->getOperand(0); EVT VT = N->getValueType(0); unsigned Alignment = 0; if (NumVecs != 3) { Alignment = cast(Align)->getZExtValue(); unsigned NumBytes = NumVecs * VT.getScalarSizeInBits() / 8; if (Alignment > NumBytes) Alignment = NumBytes; if (Alignment < 8 && Alignment < NumBytes) Alignment = 0; // Alignment must be a power of two; make sure of that. Alignment = (Alignment & -Alignment); if (Alignment == 1) Alignment = 0; } Align = CurDAG->getTargetConstant(Alignment, dl, MVT::i32); unsigned Opc; switch (VT.getSimpleVT().SimpleTy) { default: llvm_unreachable("unhandled vld-dup type"); case MVT::v8i8: Opc = DOpcodes[0]; break; case MVT::v16i8: Opc = QOpcodes[0]; break; case MVT::v4i16: Opc = DOpcodes[1]; break; case MVT::v8i16: Opc = QOpcodes[1]; break; case MVT::v2f32: case MVT::v2i32: Opc = DOpcodes[2]; break; case MVT::v4f32: case MVT::v4i32: Opc = QOpcodes[2]; break; } SDValue Pred = getAL(CurDAG, dl); SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SmallVector Ops; Ops.push_back(MemAddr); Ops.push_back(Align); if (isUpdating) { // fixed-stride update instructions don't have an explicit writeback // operand. It's implicit in the opcode itself. SDValue Inc = N->getOperand(2); bool IsImmUpdate = isPerfectIncrement(Inc, VT.getVectorElementType(), NumVecs); if (NumVecs <= 2 && !IsImmUpdate) Opc = getVLDSTRegisterUpdateOpcode(Opc); if (!IsImmUpdate) Ops.push_back(Inc); // FIXME: VLD3 and VLD4 haven't been updated to that form yet. else if (NumVecs > 2) Ops.push_back(Reg0); } Ops.push_back(Pred); Ops.push_back(Reg0); Ops.push_back(Chain); unsigned ResTyElts = (NumVecs == 3) ? 4 : NumVecs; std::vector ResTys; ResTys.push_back(EVT::getVectorVT(*CurDAG->getContext(), MVT::i64,ResTyElts)); if (isUpdating) ResTys.push_back(MVT::i32); ResTys.push_back(MVT::Other); SDNode *VLdDup = CurDAG->getMachineNode(Opc, dl, ResTys, Ops); cast(VLdDup)->setMemRefs(MemOp, MemOp + 1); // Extract the subregisters. if (NumVecs == 1) { ReplaceUses(SDValue(N, 0), SDValue(VLdDup, 0)); } else { SDValue SuperReg = SDValue(VLdDup, 0); static_assert(ARM::dsub_7 == ARM::dsub_0 + 7, "Unexpected subreg numbering"); unsigned SubIdx = ARM::dsub_0; for (unsigned Vec = 0; Vec < NumVecs; ++Vec) ReplaceUses(SDValue(N, Vec), CurDAG->getTargetExtractSubreg(SubIdx+Vec, dl, VT, SuperReg)); } ReplaceUses(SDValue(N, NumVecs), SDValue(VLdDup, 1)); if (isUpdating) ReplaceUses(SDValue(N, NumVecs + 1), SDValue(VLdDup, 2)); CurDAG->RemoveDeadNode(N); } bool ARMDAGToDAGISel::tryV6T2BitfieldExtractOp(SDNode *N, bool isSigned) { if (!Subtarget->hasV6T2Ops()) return false; unsigned Opc = isSigned ? (Subtarget->isThumb() ? ARM::t2SBFX : ARM::SBFX) : (Subtarget->isThumb() ? ARM::t2UBFX : ARM::UBFX); SDLoc dl(N); // For unsigned extracts, check for a shift right and mask unsigned And_imm = 0; if (N->getOpcode() == ISD::AND) { if (isOpcWithIntImmediate(N, ISD::AND, And_imm)) { // The immediate is a mask of the low bits iff imm & (imm+1) == 0 if (And_imm & (And_imm + 1)) return false; unsigned Srl_imm = 0; if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::SRL, Srl_imm)) { assert(Srl_imm > 0 && Srl_imm < 32 && "bad amount in shift node!"); // Note: The width operand is encoded as width-1. unsigned Width = countTrailingOnes(And_imm) - 1; unsigned LSB = Srl_imm; SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); if ((LSB + Width + 1) == N->getValueType(0).getSizeInBits()) { // It's cheaper to use a right shift to extract the top bits. if (Subtarget->isThumb()) { Opc = isSigned ? ARM::t2ASRri : ARM::t2LSRri; SDValue Ops[] = { N->getOperand(0).getOperand(0), CurDAG->getTargetConstant(LSB, dl, MVT::i32), getAL(CurDAG, dl), Reg0, Reg0 }; CurDAG->SelectNodeTo(N, Opc, MVT::i32, Ops); return true; } // ARM models shift instructions as MOVsi with shifter operand. ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(ISD::SRL); SDValue ShOpc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, LSB), dl, MVT::i32); SDValue Ops[] = { N->getOperand(0).getOperand(0), ShOpc, getAL(CurDAG, dl), Reg0, Reg0 }; CurDAG->SelectNodeTo(N, ARM::MOVsi, MVT::i32, Ops); return true; } SDValue Ops[] = { N->getOperand(0).getOperand(0), CurDAG->getTargetConstant(LSB, dl, MVT::i32), CurDAG->getTargetConstant(Width, dl, MVT::i32), getAL(CurDAG, dl), Reg0 }; CurDAG->SelectNodeTo(N, Opc, MVT::i32, Ops); return true; } } return false; } // Otherwise, we're looking for a shift of a shift unsigned Shl_imm = 0; if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::SHL, Shl_imm)) { assert(Shl_imm > 0 && Shl_imm < 32 && "bad amount in shift node!"); unsigned Srl_imm = 0; if (isInt32Immediate(N->getOperand(1), Srl_imm)) { assert(Srl_imm > 0 && Srl_imm < 32 && "bad amount in shift node!"); // Note: The width operand is encoded as width-1. unsigned Width = 32 - Srl_imm - 1; int LSB = Srl_imm - Shl_imm; if (LSB < 0) return false; SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SDValue Ops[] = { N->getOperand(0).getOperand(0), CurDAG->getTargetConstant(LSB, dl, MVT::i32), CurDAG->getTargetConstant(Width, dl, MVT::i32), getAL(CurDAG, dl), Reg0 }; CurDAG->SelectNodeTo(N, Opc, MVT::i32, Ops); return true; } } // Or we are looking for a shift of an and, with a mask operand if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, And_imm) && isShiftedMask_32(And_imm)) { unsigned Srl_imm = 0; unsigned LSB = countTrailingZeros(And_imm); // Shift must be the same as the ands lsb if (isInt32Immediate(N->getOperand(1), Srl_imm) && Srl_imm == LSB) { assert(Srl_imm > 0 && Srl_imm < 32 && "bad amount in shift node!"); unsigned MSB = 31 - countLeadingZeros(And_imm); // Note: The width operand is encoded as width-1. unsigned Width = MSB - LSB; SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SDValue Ops[] = { N->getOperand(0).getOperand(0), CurDAG->getTargetConstant(Srl_imm, dl, MVT::i32), CurDAG->getTargetConstant(Width, dl, MVT::i32), getAL(CurDAG, dl), Reg0 }; CurDAG->SelectNodeTo(N, Opc, MVT::i32, Ops); return true; } } if (N->getOpcode() == ISD::SIGN_EXTEND_INREG) { unsigned Width = cast(N->getOperand(1))->getVT().getSizeInBits(); unsigned LSB = 0; if (!isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::SRL, LSB) && !isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::SRA, LSB)) return false; if (LSB + Width > 32) return false; SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); SDValue Ops[] = { N->getOperand(0).getOperand(0), CurDAG->getTargetConstant(LSB, dl, MVT::i32), CurDAG->getTargetConstant(Width - 1, dl, MVT::i32), getAL(CurDAG, dl), Reg0 }; CurDAG->SelectNodeTo(N, Opc, MVT::i32, Ops); return true; } return false; } /// Target-specific DAG combining for ISD::XOR. /// Target-independent combining lowers SELECT_CC nodes of the form /// select_cc setg[ge] X, 0, X, -X /// select_cc setgt X, -1, X, -X /// select_cc setl[te] X, 0, -X, X /// select_cc setlt X, 1, -X, X /// which represent Integer ABS into: /// Y = sra (X, size(X)-1); xor (add (X, Y), Y) /// ARM instruction selection detects the latter and matches it to /// ARM::ABS or ARM::t2ABS machine node. bool ARMDAGToDAGISel::tryABSOp(SDNode *N){ SDValue XORSrc0 = N->getOperand(0); SDValue XORSrc1 = N->getOperand(1); EVT VT = N->getValueType(0); if (Subtarget->isThumb1Only()) return false; if (XORSrc0.getOpcode() != ISD::ADD || XORSrc1.getOpcode() != ISD::SRA) return false; SDValue ADDSrc0 = XORSrc0.getOperand(0); SDValue ADDSrc1 = XORSrc0.getOperand(1); SDValue SRASrc0 = XORSrc1.getOperand(0); SDValue SRASrc1 = XORSrc1.getOperand(1); ConstantSDNode *SRAConstant = dyn_cast(SRASrc1); EVT XType = SRASrc0.getValueType(); unsigned Size = XType.getSizeInBits() - 1; if (ADDSrc1 == XORSrc1 && ADDSrc0 == SRASrc0 && XType.isInteger() && SRAConstant != nullptr && Size == SRAConstant->getZExtValue()) { unsigned Opcode = Subtarget->isThumb2() ? ARM::t2ABS : ARM::ABS; CurDAG->SelectNodeTo(N, Opcode, VT, ADDSrc0); return true; } return false; } /// We've got special pseudo-instructions for these void ARMDAGToDAGISel::SelectCMP_SWAP(SDNode *N) { unsigned Opcode; EVT MemTy = cast(N)->getMemoryVT(); if (MemTy == MVT::i8) Opcode = ARM::CMP_SWAP_8; else if (MemTy == MVT::i16) Opcode = ARM::CMP_SWAP_16; else if (MemTy == MVT::i32) Opcode = ARM::CMP_SWAP_32; else llvm_unreachable("Unknown AtomicCmpSwap type"); SDValue Ops[] = {N->getOperand(1), N->getOperand(2), N->getOperand(3), N->getOperand(0)}; SDNode *CmpSwap = CurDAG->getMachineNode( Opcode, SDLoc(N), CurDAG->getVTList(MVT::i32, MVT::i32, MVT::Other), Ops); MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); cast(CmpSwap)->setMemRefs(MemOp, MemOp + 1); ReplaceUses(SDValue(N, 0), SDValue(CmpSwap, 0)); ReplaceUses(SDValue(N, 1), SDValue(CmpSwap, 2)); CurDAG->RemoveDeadNode(N); } static Optional> getContiguousRangeOfSetBits(const APInt &A) { unsigned FirstOne = A.getBitWidth() - A.countLeadingZeros() - 1; unsigned LastOne = A.countTrailingZeros(); if (A.countPopulation() != (FirstOne - LastOne + 1)) return Optional>(); return std::make_pair(FirstOne, LastOne); } void ARMDAGToDAGISel::SelectCMPZ(SDNode *N, bool &SwitchEQNEToPLMI) { assert(N->getOpcode() == ARMISD::CMPZ); SwitchEQNEToPLMI = false; if (!Subtarget->isThumb()) // FIXME: Work out whether it is profitable to do this in A32 mode - LSL and // LSR don't exist as standalone instructions - they need the barrel shifter. return; // select (cmpz (and X, C), #0) -> (LSLS X) or (LSRS X) or (LSRS (LSLS X)) SDValue And = N->getOperand(0); if (!And->hasOneUse()) return; SDValue Zero = N->getOperand(1); if (!isa(Zero) || !cast(Zero)->isNullValue() || And->getOpcode() != ISD::AND) return; SDValue X = And.getOperand(0); auto C = dyn_cast(And.getOperand(1)); if (!C || !X->hasOneUse()) return; auto Range = getContiguousRangeOfSetBits(C->getAPIntValue()); if (!Range) return; // There are several ways to lower this: SDNode *NewN; SDLoc dl(N); auto EmitShift = [&](unsigned Opc, SDValue Src, unsigned Imm) -> SDNode* { if (Subtarget->isThumb2()) { Opc = (Opc == ARM::tLSLri) ? ARM::t2LSLri : ARM::t2LSRri; SDValue Ops[] = { Src, CurDAG->getTargetConstant(Imm, dl, MVT::i32), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getRegister(0, MVT::i32) }; return CurDAG->getMachineNode(Opc, dl, MVT::i32, Ops); } else { SDValue Ops[] = {CurDAG->getRegister(ARM::CPSR, MVT::i32), Src, CurDAG->getTargetConstant(Imm, dl, MVT::i32), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32)}; return CurDAG->getMachineNode(Opc, dl, MVT::i32, Ops); } }; if (Range->second == 0) { // 1. Mask includes the LSB -> Simply shift the top N bits off NewN = EmitShift(ARM::tLSLri, X, 31 - Range->first); ReplaceNode(And.getNode(), NewN); } else if (Range->first == 31) { // 2. Mask includes the MSB -> Simply shift the bottom N bits off NewN = EmitShift(ARM::tLSRri, X, Range->second); ReplaceNode(And.getNode(), NewN); } else if (Range->first == Range->second) { // 3. Only one bit is set. We can shift this into the sign bit and use a // PL/MI comparison. NewN = EmitShift(ARM::tLSLri, X, 31 - Range->first); ReplaceNode(And.getNode(), NewN); SwitchEQNEToPLMI = true; } else if (!Subtarget->hasV6T2Ops()) { // 4. Do a double shift to clear bottom and top bits, but only in // thumb-1 mode as in thumb-2 we can use UBFX. NewN = EmitShift(ARM::tLSLri, X, 31 - Range->first); NewN = EmitShift(ARM::tLSRri, SDValue(NewN, 0), Range->second + (31 - Range->first)); ReplaceNode(And.getNode(), NewN); } } void ARMDAGToDAGISel::Select(SDNode *N) { SDLoc dl(N); if (N->isMachineOpcode()) { N->setNodeId(-1); return; // Already selected. } switch (N->getOpcode()) { default: break; case ISD::WRITE_REGISTER: if (tryWriteRegister(N)) return; break; case ISD::READ_REGISTER: if (tryReadRegister(N)) return; break; case ISD::INLINEASM: if (tryInlineAsm(N)) return; break; case ISD::XOR: // Select special operations if XOR node forms integer ABS pattern if (tryABSOp(N)) return; // Other cases are autogenerated. break; case ISD::Constant: { unsigned Val = cast(N)->getZExtValue(); // If we can't materialize the constant we need to use a literal pool if (ConstantMaterializationCost(Val) > 2) { SDValue CPIdx = CurDAG->getTargetConstantPool( ConstantInt::get(Type::getInt32Ty(*CurDAG->getContext()), Val), TLI->getPointerTy(CurDAG->getDataLayout())); SDNode *ResNode; if (Subtarget->isThumb()) { SDValue Ops[] = { CPIdx, getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getEntryNode() }; ResNode = CurDAG->getMachineNode(ARM::tLDRpci, dl, MVT::i32, MVT::Other, Ops); } else { SDValue Ops[] = { CPIdx, CurDAG->getTargetConstant(0, dl, MVT::i32), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getEntryNode() }; ResNode = CurDAG->getMachineNode(ARM::LDRcp, dl, MVT::i32, MVT::Other, Ops); } // Annotate the Node with memory operand information so that MachineInstr // queries work properly. This e.g. gives the register allocation the // required information for rematerialization. MachineFunction& MF = CurDAG->getMachineFunction(); MachineSDNode::mmo_iterator MemOp = MF.allocateMemRefsArray(1); MemOp[0] = MF.getMachineMemOperand( MachinePointerInfo::getConstantPool(MF), MachineMemOperand::MOLoad, 4, 4); cast(ResNode)->setMemRefs(MemOp, MemOp+1); ReplaceNode(N, ResNode); return; } // Other cases are autogenerated. break; } case ISD::FrameIndex: { // Selects to ADDri FI, 0 which in turn will become ADDri SP, imm. int FI = cast(N)->getIndex(); SDValue TFI = CurDAG->getTargetFrameIndex( FI, TLI->getPointerTy(CurDAG->getDataLayout())); if (Subtarget->isThumb1Only()) { // Set the alignment of the frame object to 4, to avoid having to generate // more than one ADD MachineFrameInfo &MFI = MF->getFrameInfo(); if (MFI.getObjectAlignment(FI) < 4) MFI.setObjectAlignment(FI, 4); CurDAG->SelectNodeTo(N, ARM::tADDframe, MVT::i32, TFI, CurDAG->getTargetConstant(0, dl, MVT::i32)); return; } else { unsigned Opc = ((Subtarget->isThumb() && Subtarget->hasThumb2()) ? ARM::t2ADDri : ARM::ADDri); SDValue Ops[] = { TFI, CurDAG->getTargetConstant(0, dl, MVT::i32), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getRegister(0, MVT::i32) }; CurDAG->SelectNodeTo(N, Opc, MVT::i32, Ops); return; } } case ISD::SRL: if (tryV6T2BitfieldExtractOp(N, false)) return; break; case ISD::SIGN_EXTEND_INREG: case ISD::SRA: if (tryV6T2BitfieldExtractOp(N, true)) return; break; case ISD::MUL: if (Subtarget->isThumb1Only()) break; if (ConstantSDNode *C = dyn_cast(N->getOperand(1))) { unsigned RHSV = C->getZExtValue(); if (!RHSV) break; if (isPowerOf2_32(RHSV-1)) { // 2^n+1? unsigned ShImm = Log2_32(RHSV-1); if (ShImm >= 32) break; SDValue V = N->getOperand(0); ShImm = ARM_AM::getSORegOpc(ARM_AM::lsl, ShImm); SDValue ShImmOp = CurDAG->getTargetConstant(ShImm, dl, MVT::i32); SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); if (Subtarget->isThumb()) { SDValue Ops[] = { V, V, ShImmOp, getAL(CurDAG, dl), Reg0, Reg0 }; CurDAG->SelectNodeTo(N, ARM::t2ADDrs, MVT::i32, Ops); return; } else { SDValue Ops[] = { V, V, Reg0, ShImmOp, getAL(CurDAG, dl), Reg0, Reg0 }; CurDAG->SelectNodeTo(N, ARM::ADDrsi, MVT::i32, Ops); return; } } if (isPowerOf2_32(RHSV+1)) { // 2^n-1? unsigned ShImm = Log2_32(RHSV+1); if (ShImm >= 32) break; SDValue V = N->getOperand(0); ShImm = ARM_AM::getSORegOpc(ARM_AM::lsl, ShImm); SDValue ShImmOp = CurDAG->getTargetConstant(ShImm, dl, MVT::i32); SDValue Reg0 = CurDAG->getRegister(0, MVT::i32); if (Subtarget->isThumb()) { SDValue Ops[] = { V, V, ShImmOp, getAL(CurDAG, dl), Reg0, Reg0 }; CurDAG->SelectNodeTo(N, ARM::t2RSBrs, MVT::i32, Ops); return; } else { SDValue Ops[] = { V, V, Reg0, ShImmOp, getAL(CurDAG, dl), Reg0, Reg0 }; CurDAG->SelectNodeTo(N, ARM::RSBrsi, MVT::i32, Ops); return; } } } break; case ISD::AND: { // Check for unsigned bitfield extract if (tryV6T2BitfieldExtractOp(N, false)) return; // If an immediate is used in an AND node, it is possible that the immediate // can be more optimally materialized when negated. If this is the case we // can negate the immediate and use a BIC instead. auto *N1C = dyn_cast(N->getOperand(1)); if (N1C && N1C->hasOneUse() && Subtarget->isThumb()) { uint32_t Imm = (uint32_t) N1C->getZExtValue(); // In Thumb2 mode, an AND can take a 12-bit immediate. If this // immediate can be negated and fit in the immediate operand of // a t2BIC, don't do any manual transform here as this can be // handled by the generic ISel machinery. bool PreferImmediateEncoding = Subtarget->hasThumb2() && (is_t2_so_imm(Imm) || is_t2_so_imm_not(Imm)); if (!PreferImmediateEncoding && ConstantMaterializationCost(Imm) > ConstantMaterializationCost(~Imm)) { // The current immediate costs more to materialize than a negated // immediate, so negate the immediate and use a BIC. SDValue NewImm = CurDAG->getConstant(~N1C->getZExtValue(), dl, MVT::i32); // If the new constant didn't exist before, reposition it in the topological // ordering so it is just before N. Otherwise, don't touch its location. if (NewImm->getNodeId() == -1) CurDAG->RepositionNode(N->getIterator(), NewImm.getNode()); if (!Subtarget->hasThumb2()) { SDValue Ops[] = {CurDAG->getRegister(ARM::CPSR, MVT::i32), N->getOperand(0), NewImm, getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32)}; ReplaceNode(N, CurDAG->getMachineNode(ARM::tBIC, dl, MVT::i32, Ops)); return; } else { SDValue Ops[] = {N->getOperand(0), NewImm, getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getRegister(0, MVT::i32)}; ReplaceNode(N, CurDAG->getMachineNode(ARM::t2BICrr, dl, MVT::i32, Ops)); return; } } } // (and (or x, c2), c1) and top 16-bits of c1 and c2 match, lower 16-bits // of c1 are 0xffff, and lower 16-bit of c2 are 0. That is, the top 16-bits // are entirely contributed by c2 and lower 16-bits are entirely contributed // by x. That's equal to (or (and x, 0xffff), (and c1, 0xffff0000)). // Select it to: "movt x, ((c1 & 0xffff) >> 16) EVT VT = N->getValueType(0); if (VT != MVT::i32) break; unsigned Opc = (Subtarget->isThumb() && Subtarget->hasThumb2()) ? ARM::t2MOVTi16 : (Subtarget->hasV6T2Ops() ? ARM::MOVTi16 : 0); if (!Opc) break; SDValue N0 = N->getOperand(0), N1 = N->getOperand(1); N1C = dyn_cast(N1); if (!N1C) break; if (N0.getOpcode() == ISD::OR && N0.getNode()->hasOneUse()) { SDValue N2 = N0.getOperand(1); ConstantSDNode *N2C = dyn_cast(N2); if (!N2C) break; unsigned N1CVal = N1C->getZExtValue(); unsigned N2CVal = N2C->getZExtValue(); if ((N1CVal & 0xffff0000U) == (N2CVal & 0xffff0000U) && (N1CVal & 0xffffU) == 0xffffU && (N2CVal & 0xffffU) == 0x0U) { SDValue Imm16 = CurDAG->getTargetConstant((N2CVal & 0xFFFF0000U) >> 16, dl, MVT::i32); SDValue Ops[] = { N0.getOperand(0), Imm16, getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32) }; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, VT, Ops)); return; } } break; } case ARMISD::UMAAL: { unsigned Opc = Subtarget->isThumb() ? ARM::t2UMAAL : ARM::UMAAL; SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32) }; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, MVT::i32, MVT::i32, Ops)); return; } case ARMISD::UMLAL:{ if (Subtarget->isThumb()) { SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32)}; ReplaceNode( N, CurDAG->getMachineNode(ARM::t2UMLAL, dl, MVT::i32, MVT::i32, Ops)); return; }else{ SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getRegister(0, MVT::i32) }; ReplaceNode(N, CurDAG->getMachineNode( Subtarget->hasV6Ops() ? ARM::UMLAL : ARM::UMLALv5, dl, MVT::i32, MVT::i32, Ops)); return; } } case ARMISD::SMLAL:{ if (Subtarget->isThumb()) { SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32)}; ReplaceNode( N, CurDAG->getMachineNode(ARM::t2SMLAL, dl, MVT::i32, MVT::i32, Ops)); return; }else{ SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getRegister(0, MVT::i32) }; ReplaceNode(N, CurDAG->getMachineNode( Subtarget->hasV6Ops() ? ARM::SMLAL : ARM::SMLALv5, dl, MVT::i32, MVT::i32, Ops)); return; } } case ARMISD::SUBE: { if (!Subtarget->hasV6Ops()) break; // Look for a pattern to match SMMLS // (sube a, (smul_loHi a, b), (subc 0, (smul_LOhi(a, b)))) if (N->getOperand(1).getOpcode() != ISD::SMUL_LOHI || N->getOperand(2).getOpcode() != ARMISD::SUBC || !SDValue(N, 1).use_empty()) break; if (Subtarget->isThumb()) assert(Subtarget->hasThumb2() && "This pattern should not be generated for Thumb"); SDValue SmulLoHi = N->getOperand(1); SDValue Subc = N->getOperand(2); auto *Zero = dyn_cast(Subc.getOperand(0)); if (!Zero || Zero->getZExtValue() != 0 || Subc.getOperand(1) != SmulLoHi.getValue(0) || N->getOperand(1) != SmulLoHi.getValue(1) || N->getOperand(2) != Subc.getValue(1)) break; unsigned Opc = Subtarget->isThumb2() ? ARM::t2SMMLS : ARM::SMMLS; SDValue Ops[] = { SmulLoHi.getOperand(0), SmulLoHi.getOperand(1), N->getOperand(0), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32) }; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, MVT::i32, Ops)); return; } case ISD::LOAD: { if (Subtarget->isThumb() && Subtarget->hasThumb2()) { if (tryT2IndexedLoad(N)) return; } else if (Subtarget->isThumb()) { if (tryT1IndexedLoad(N)) return; } else if (tryARMIndexedLoad(N)) return; // Other cases are autogenerated. break; } case ARMISD::BRCOND: { // Pattern: (ARMbrcond:void (bb:Other):$dst, (imm:i32):$cc) // Emits: (Bcc:void (bb:Other):$dst, (imm:i32):$cc) // Pattern complexity = 6 cost = 1 size = 0 // Pattern: (ARMbrcond:void (bb:Other):$dst, (imm:i32):$cc) // Emits: (tBcc:void (bb:Other):$dst, (imm:i32):$cc) // Pattern complexity = 6 cost = 1 size = 0 // Pattern: (ARMbrcond:void (bb:Other):$dst, (imm:i32):$cc) // Emits: (t2Bcc:void (bb:Other):$dst, (imm:i32):$cc) // Pattern complexity = 6 cost = 1 size = 0 unsigned Opc = Subtarget->isThumb() ? ((Subtarget->hasThumb2()) ? ARM::t2Bcc : ARM::tBcc) : ARM::Bcc; SDValue Chain = N->getOperand(0); SDValue N1 = N->getOperand(1); SDValue N2 = N->getOperand(2); SDValue N3 = N->getOperand(3); SDValue InFlag = N->getOperand(4); assert(N1.getOpcode() == ISD::BasicBlock); assert(N2.getOpcode() == ISD::Constant); assert(N3.getOpcode() == ISD::Register); unsigned CC = (unsigned) cast(N2)->getZExtValue(); if (InFlag.getOpcode() == ARMISD::CMPZ) { bool SwitchEQNEToPLMI; SelectCMPZ(InFlag.getNode(), SwitchEQNEToPLMI); InFlag = N->getOperand(4); if (SwitchEQNEToPLMI) { switch ((ARMCC::CondCodes)CC) { default: llvm_unreachable("CMPZ must be either NE or EQ!"); case ARMCC::NE: CC = (unsigned)ARMCC::MI; break; case ARMCC::EQ: CC = (unsigned)ARMCC::PL; break; } } } SDValue Tmp2 = CurDAG->getTargetConstant(CC, dl, MVT::i32); SDValue Ops[] = { N1, Tmp2, N3, Chain, InFlag }; SDNode *ResNode = CurDAG->getMachineNode(Opc, dl, MVT::Other, MVT::Glue, Ops); Chain = SDValue(ResNode, 0); if (N->getNumValues() == 2) { InFlag = SDValue(ResNode, 1); ReplaceUses(SDValue(N, 1), InFlag); } ReplaceUses(SDValue(N, 0), SDValue(Chain.getNode(), Chain.getResNo())); CurDAG->RemoveDeadNode(N); return; } case ARMISD::CMPZ: { // select (CMPZ X, #-C) -> (CMPZ (ADDS X, #C), #0) // This allows us to avoid materializing the expensive negative constant. // The CMPZ #0 is useless and will be peepholed away but we need to keep it // for its glue output. SDValue X = N->getOperand(0); auto *C = dyn_cast(N->getOperand(1).getNode()); if (C && C->getSExtValue() < 0 && Subtarget->isThumb()) { int64_t Addend = -C->getSExtValue(); SDNode *Add = nullptr; // ADDS can be better than CMN if the immediate fits in a // 16-bit ADDS, which means either [0,256) for tADDi8 or [0,8) for tADDi3. // Outside that range we can just use a CMN which is 32-bit but has a // 12-bit immediate range. if (Addend < 1<<8) { if (Subtarget->isThumb2()) { SDValue Ops[] = { X, CurDAG->getTargetConstant(Addend, dl, MVT::i32), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), CurDAG->getRegister(0, MVT::i32) }; Add = CurDAG->getMachineNode(ARM::t2ADDri, dl, MVT::i32, Ops); } else { unsigned Opc = (Addend < 1<<3) ? ARM::tADDi3 : ARM::tADDi8; SDValue Ops[] = {CurDAG->getRegister(ARM::CPSR, MVT::i32), X, CurDAG->getTargetConstant(Addend, dl, MVT::i32), getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32)}; Add = CurDAG->getMachineNode(Opc, dl, MVT::i32, Ops); } } if (Add) { SDValue Ops2[] = {SDValue(Add, 0), CurDAG->getConstant(0, dl, MVT::i32)}; CurDAG->MorphNodeTo(N, ARMISD::CMPZ, CurDAG->getVTList(MVT::Glue), Ops2); } } // Other cases are autogenerated. break; } case ARMISD::CMOV: { SDValue InFlag = N->getOperand(4); if (InFlag.getOpcode() == ARMISD::CMPZ) { bool SwitchEQNEToPLMI; SelectCMPZ(InFlag.getNode(), SwitchEQNEToPLMI); if (SwitchEQNEToPLMI) { SDValue ARMcc = N->getOperand(2); ARMCC::CondCodes CC = (ARMCC::CondCodes)cast(ARMcc)->getZExtValue(); switch (CC) { default: llvm_unreachable("CMPZ must be either NE or EQ!"); case ARMCC::NE: CC = ARMCC::MI; break; case ARMCC::EQ: CC = ARMCC::PL; break; } SDValue NewARMcc = CurDAG->getConstant((unsigned)CC, dl, MVT::i32); SDValue Ops[] = {N->getOperand(0), N->getOperand(1), NewARMcc, N->getOperand(3), N->getOperand(4)}; CurDAG->MorphNodeTo(N, ARMISD::CMOV, N->getVTList(), Ops); } } // Other cases are autogenerated. break; } case ARMISD::VZIP: { unsigned Opc = 0; EVT VT = N->getValueType(0); switch (VT.getSimpleVT().SimpleTy) { default: return; case MVT::v8i8: Opc = ARM::VZIPd8; break; case MVT::v4i16: Opc = ARM::VZIPd16; break; case MVT::v2f32: // vzip.32 Dd, Dm is a pseudo-instruction expanded to vtrn.32 Dd, Dm. case MVT::v2i32: Opc = ARM::VTRNd32; break; case MVT::v16i8: Opc = ARM::VZIPq8; break; case MVT::v8i16: Opc = ARM::VZIPq16; break; case MVT::v4f32: case MVT::v4i32: Opc = ARM::VZIPq32; break; } SDValue Pred = getAL(CurDAG, dl); SDValue PredReg = CurDAG->getRegister(0, MVT::i32); SDValue Ops[] = { N->getOperand(0), N->getOperand(1), Pred, PredReg }; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, VT, VT, Ops)); return; } case ARMISD::VUZP: { unsigned Opc = 0; EVT VT = N->getValueType(0); switch (VT.getSimpleVT().SimpleTy) { default: return; case MVT::v8i8: Opc = ARM::VUZPd8; break; case MVT::v4i16: Opc = ARM::VUZPd16; break; case MVT::v2f32: // vuzp.32 Dd, Dm is a pseudo-instruction expanded to vtrn.32 Dd, Dm. case MVT::v2i32: Opc = ARM::VTRNd32; break; case MVT::v16i8: Opc = ARM::VUZPq8; break; case MVT::v8i16: Opc = ARM::VUZPq16; break; case MVT::v4f32: case MVT::v4i32: Opc = ARM::VUZPq32; break; } SDValue Pred = getAL(CurDAG, dl); SDValue PredReg = CurDAG->getRegister(0, MVT::i32); SDValue Ops[] = { N->getOperand(0), N->getOperand(1), Pred, PredReg }; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, VT, VT, Ops)); return; } case ARMISD::VTRN: { unsigned Opc = 0; EVT VT = N->getValueType(0); switch (VT.getSimpleVT().SimpleTy) { default: return; case MVT::v8i8: Opc = ARM::VTRNd8; break; case MVT::v4i16: Opc = ARM::VTRNd16; break; case MVT::v2f32: case MVT::v2i32: Opc = ARM::VTRNd32; break; case MVT::v16i8: Opc = ARM::VTRNq8; break; case MVT::v8i16: Opc = ARM::VTRNq16; break; case MVT::v4f32: case MVT::v4i32: Opc = ARM::VTRNq32; break; } SDValue Pred = getAL(CurDAG, dl); SDValue PredReg = CurDAG->getRegister(0, MVT::i32); SDValue Ops[] = { N->getOperand(0), N->getOperand(1), Pred, PredReg }; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, VT, VT, Ops)); return; } case ARMISD::BUILD_VECTOR: { EVT VecVT = N->getValueType(0); EVT EltVT = VecVT.getVectorElementType(); unsigned NumElts = VecVT.getVectorNumElements(); if (EltVT == MVT::f64) { assert(NumElts == 2 && "unexpected type for BUILD_VECTOR"); ReplaceNode( N, createDRegPairNode(VecVT, N->getOperand(0), N->getOperand(1))); return; } assert(EltVT == MVT::f32 && "unexpected type for BUILD_VECTOR"); if (NumElts == 2) { ReplaceNode( N, createSRegPairNode(VecVT, N->getOperand(0), N->getOperand(1))); return; } assert(NumElts == 4 && "unexpected type for BUILD_VECTOR"); ReplaceNode(N, createQuadSRegsNode(VecVT, N->getOperand(0), N->getOperand(1), N->getOperand(2), N->getOperand(3))); return; } case ARMISD::VLD1DUP: { static const uint16_t DOpcodes[] = { ARM::VLD1DUPd8, ARM::VLD1DUPd16, ARM::VLD1DUPd32 }; static const uint16_t QOpcodes[] = { ARM::VLD1DUPq8, ARM::VLD1DUPq16, ARM::VLD1DUPq32 }; SelectVLDDup(N, false, 1, DOpcodes, QOpcodes); return; } case ARMISD::VLD2DUP: { static const uint16_t Opcodes[] = { ARM::VLD2DUPd8, ARM::VLD2DUPd16, ARM::VLD2DUPd32 }; SelectVLDDup(N, false, 2, Opcodes); return; } case ARMISD::VLD3DUP: { static const uint16_t Opcodes[] = { ARM::VLD3DUPd8Pseudo, ARM::VLD3DUPd16Pseudo, ARM::VLD3DUPd32Pseudo }; SelectVLDDup(N, false, 3, Opcodes); return; } case ARMISD::VLD4DUP: { static const uint16_t Opcodes[] = { ARM::VLD4DUPd8Pseudo, ARM::VLD4DUPd16Pseudo, ARM::VLD4DUPd32Pseudo }; SelectVLDDup(N, false, 4, Opcodes); return; } case ARMISD::VLD1DUP_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD1DUPd8wb_fixed, ARM::VLD1DUPd16wb_fixed, ARM::VLD1DUPd32wb_fixed }; static const uint16_t QOpcodes[] = { ARM::VLD1DUPq8wb_fixed, ARM::VLD1DUPq16wb_fixed, ARM::VLD1DUPq32wb_fixed }; SelectVLDDup(N, true, 1, DOpcodes, QOpcodes); return; } case ARMISD::VLD2DUP_UPD: { static const uint16_t Opcodes[] = { ARM::VLD2DUPd8wb_fixed, ARM::VLD2DUPd16wb_fixed, ARM::VLD2DUPd32wb_fixed }; SelectVLDDup(N, true, 2, Opcodes); return; } case ARMISD::VLD3DUP_UPD: { static const uint16_t Opcodes[] = { ARM::VLD3DUPd8Pseudo_UPD, ARM::VLD3DUPd16Pseudo_UPD, ARM::VLD3DUPd32Pseudo_UPD }; SelectVLDDup(N, true, 3, Opcodes); return; } case ARMISD::VLD4DUP_UPD: { static const uint16_t Opcodes[] = { ARM::VLD4DUPd8Pseudo_UPD, ARM::VLD4DUPd16Pseudo_UPD, ARM::VLD4DUPd32Pseudo_UPD }; SelectVLDDup(N, true, 4, Opcodes); return; } case ARMISD::VLD1_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD1d8wb_fixed, ARM::VLD1d16wb_fixed, ARM::VLD1d32wb_fixed, ARM::VLD1d64wb_fixed }; static const uint16_t QOpcodes[] = { ARM::VLD1q8wb_fixed, ARM::VLD1q16wb_fixed, ARM::VLD1q32wb_fixed, ARM::VLD1q64wb_fixed }; SelectVLD(N, true, 1, DOpcodes, QOpcodes, nullptr); return; } case ARMISD::VLD2_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD2d8wb_fixed, ARM::VLD2d16wb_fixed, ARM::VLD2d32wb_fixed, ARM::VLD1q64wb_fixed}; static const uint16_t QOpcodes[] = { ARM::VLD2q8PseudoWB_fixed, ARM::VLD2q16PseudoWB_fixed, ARM::VLD2q32PseudoWB_fixed }; SelectVLD(N, true, 2, DOpcodes, QOpcodes, nullptr); return; } case ARMISD::VLD3_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD3d8Pseudo_UPD, ARM::VLD3d16Pseudo_UPD, ARM::VLD3d32Pseudo_UPD, ARM::VLD1d64TPseudoWB_fixed}; static const uint16_t QOpcodes0[] = { ARM::VLD3q8Pseudo_UPD, ARM::VLD3q16Pseudo_UPD, ARM::VLD3q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VLD3q8oddPseudo_UPD, ARM::VLD3q16oddPseudo_UPD, ARM::VLD3q32oddPseudo_UPD }; SelectVLD(N, true, 3, DOpcodes, QOpcodes0, QOpcodes1); return; } case ARMISD::VLD4_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD4d8Pseudo_UPD, ARM::VLD4d16Pseudo_UPD, ARM::VLD4d32Pseudo_UPD, ARM::VLD1d64QPseudoWB_fixed}; static const uint16_t QOpcodes0[] = { ARM::VLD4q8Pseudo_UPD, ARM::VLD4q16Pseudo_UPD, ARM::VLD4q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VLD4q8oddPseudo_UPD, ARM::VLD4q16oddPseudo_UPD, ARM::VLD4q32oddPseudo_UPD }; SelectVLD(N, true, 4, DOpcodes, QOpcodes0, QOpcodes1); return; } case ARMISD::VLD2LN_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD2LNd8Pseudo_UPD, ARM::VLD2LNd16Pseudo_UPD, ARM::VLD2LNd32Pseudo_UPD }; static const uint16_t QOpcodes[] = { ARM::VLD2LNq16Pseudo_UPD, ARM::VLD2LNq32Pseudo_UPD }; SelectVLDSTLane(N, true, true, 2, DOpcodes, QOpcodes); return; } case ARMISD::VLD3LN_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD3LNd8Pseudo_UPD, ARM::VLD3LNd16Pseudo_UPD, ARM::VLD3LNd32Pseudo_UPD }; static const uint16_t QOpcodes[] = { ARM::VLD3LNq16Pseudo_UPD, ARM::VLD3LNq32Pseudo_UPD }; SelectVLDSTLane(N, true, true, 3, DOpcodes, QOpcodes); return; } case ARMISD::VLD4LN_UPD: { static const uint16_t DOpcodes[] = { ARM::VLD4LNd8Pseudo_UPD, ARM::VLD4LNd16Pseudo_UPD, ARM::VLD4LNd32Pseudo_UPD }; static const uint16_t QOpcodes[] = { ARM::VLD4LNq16Pseudo_UPD, ARM::VLD4LNq32Pseudo_UPD }; SelectVLDSTLane(N, true, true, 4, DOpcodes, QOpcodes); return; } case ARMISD::VST1_UPD: { static const uint16_t DOpcodes[] = { ARM::VST1d8wb_fixed, ARM::VST1d16wb_fixed, ARM::VST1d32wb_fixed, ARM::VST1d64wb_fixed }; static const uint16_t QOpcodes[] = { ARM::VST1q8wb_fixed, ARM::VST1q16wb_fixed, ARM::VST1q32wb_fixed, ARM::VST1q64wb_fixed }; SelectVST(N, true, 1, DOpcodes, QOpcodes, nullptr); return; } case ARMISD::VST2_UPD: { static const uint16_t DOpcodes[] = { ARM::VST2d8wb_fixed, ARM::VST2d16wb_fixed, ARM::VST2d32wb_fixed, ARM::VST1q64wb_fixed}; static const uint16_t QOpcodes[] = { ARM::VST2q8PseudoWB_fixed, ARM::VST2q16PseudoWB_fixed, ARM::VST2q32PseudoWB_fixed }; SelectVST(N, true, 2, DOpcodes, QOpcodes, nullptr); return; } case ARMISD::VST3_UPD: { static const uint16_t DOpcodes[] = { ARM::VST3d8Pseudo_UPD, ARM::VST3d16Pseudo_UPD, ARM::VST3d32Pseudo_UPD, ARM::VST1d64TPseudoWB_fixed}; static const uint16_t QOpcodes0[] = { ARM::VST3q8Pseudo_UPD, ARM::VST3q16Pseudo_UPD, ARM::VST3q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VST3q8oddPseudo_UPD, ARM::VST3q16oddPseudo_UPD, ARM::VST3q32oddPseudo_UPD }; SelectVST(N, true, 3, DOpcodes, QOpcodes0, QOpcodes1); return; } case ARMISD::VST4_UPD: { static const uint16_t DOpcodes[] = { ARM::VST4d8Pseudo_UPD, ARM::VST4d16Pseudo_UPD, ARM::VST4d32Pseudo_UPD, ARM::VST1d64QPseudoWB_fixed}; static const uint16_t QOpcodes0[] = { ARM::VST4q8Pseudo_UPD, ARM::VST4q16Pseudo_UPD, ARM::VST4q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VST4q8oddPseudo_UPD, ARM::VST4q16oddPseudo_UPD, ARM::VST4q32oddPseudo_UPD }; SelectVST(N, true, 4, DOpcodes, QOpcodes0, QOpcodes1); return; } case ARMISD::VST2LN_UPD: { static const uint16_t DOpcodes[] = { ARM::VST2LNd8Pseudo_UPD, ARM::VST2LNd16Pseudo_UPD, ARM::VST2LNd32Pseudo_UPD }; static const uint16_t QOpcodes[] = { ARM::VST2LNq16Pseudo_UPD, ARM::VST2LNq32Pseudo_UPD }; SelectVLDSTLane(N, false, true, 2, DOpcodes, QOpcodes); return; } case ARMISD::VST3LN_UPD: { static const uint16_t DOpcodes[] = { ARM::VST3LNd8Pseudo_UPD, ARM::VST3LNd16Pseudo_UPD, ARM::VST3LNd32Pseudo_UPD }; static const uint16_t QOpcodes[] = { ARM::VST3LNq16Pseudo_UPD, ARM::VST3LNq32Pseudo_UPD }; SelectVLDSTLane(N, false, true, 3, DOpcodes, QOpcodes); return; } case ARMISD::VST4LN_UPD: { static const uint16_t DOpcodes[] = { ARM::VST4LNd8Pseudo_UPD, ARM::VST4LNd16Pseudo_UPD, ARM::VST4LNd32Pseudo_UPD }; static const uint16_t QOpcodes[] = { ARM::VST4LNq16Pseudo_UPD, ARM::VST4LNq32Pseudo_UPD }; SelectVLDSTLane(N, false, true, 4, DOpcodes, QOpcodes); return; } case ISD::INTRINSIC_VOID: case ISD::INTRINSIC_W_CHAIN: { unsigned IntNo = cast(N->getOperand(1))->getZExtValue(); switch (IntNo) { default: break; case Intrinsic::arm_mrrc: case Intrinsic::arm_mrrc2: { SDLoc dl(N); SDValue Chain = N->getOperand(0); unsigned Opc; if (Subtarget->isThumb()) Opc = (IntNo == Intrinsic::arm_mrrc ? ARM::t2MRRC : ARM::t2MRRC2); else Opc = (IntNo == Intrinsic::arm_mrrc ? ARM::MRRC : ARM::MRRC2); SmallVector Ops; Ops.push_back(getI32Imm(cast(N->getOperand(2))->getZExtValue(), dl)); /* coproc */ Ops.push_back(getI32Imm(cast(N->getOperand(3))->getZExtValue(), dl)); /* opc */ Ops.push_back(getI32Imm(cast(N->getOperand(4))->getZExtValue(), dl)); /* CRm */ // The mrrc2 instruction in ARM doesn't allow predicates, the top 4 bits of the encoded // instruction will always be '1111' but it is possible in assembly language to specify // AL as a predicate to mrrc2 but it doesn't make any difference to the encoded instruction. if (Opc != ARM::MRRC2) { Ops.push_back(getAL(CurDAG, dl)); Ops.push_back(CurDAG->getRegister(0, MVT::i32)); } Ops.push_back(Chain); // Writes to two registers. const EVT RetType[] = {MVT::i32, MVT::i32, MVT::Other}; ReplaceNode(N, CurDAG->getMachineNode(Opc, dl, RetType, Ops)); return; } case Intrinsic::arm_ldaexd: case Intrinsic::arm_ldrexd: { SDLoc dl(N); SDValue Chain = N->getOperand(0); SDValue MemAddr = N->getOperand(2); bool isThumb = Subtarget->isThumb() && Subtarget->hasV8MBaselineOps(); bool IsAcquire = IntNo == Intrinsic::arm_ldaexd; unsigned NewOpc = isThumb ? (IsAcquire ? ARM::t2LDAEXD : ARM::t2LDREXD) : (IsAcquire ? ARM::LDAEXD : ARM::LDREXD); // arm_ldrexd returns a i64 value in {i32, i32} std::vector ResTys; if (isThumb) { ResTys.push_back(MVT::i32); ResTys.push_back(MVT::i32); } else ResTys.push_back(MVT::Untyped); ResTys.push_back(MVT::Other); // Place arguments in the right order. SDValue Ops[] = {MemAddr, getAL(CurDAG, dl), CurDAG->getRegister(0, MVT::i32), Chain}; SDNode *Ld = CurDAG->getMachineNode(NewOpc, dl, ResTys, Ops); // Transfer memoperands. MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); cast(Ld)->setMemRefs(MemOp, MemOp + 1); // Remap uses. SDValue OutChain = isThumb ? SDValue(Ld, 2) : SDValue(Ld, 1); if (!SDValue(N, 0).use_empty()) { SDValue Result; if (isThumb) Result = SDValue(Ld, 0); else { SDValue SubRegIdx = CurDAG->getTargetConstant(ARM::gsub_0, dl, MVT::i32); SDNode *ResNode = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG, dl, MVT::i32, SDValue(Ld, 0), SubRegIdx); Result = SDValue(ResNode,0); } ReplaceUses(SDValue(N, 0), Result); } if (!SDValue(N, 1).use_empty()) { SDValue Result; if (isThumb) Result = SDValue(Ld, 1); else { SDValue SubRegIdx = CurDAG->getTargetConstant(ARM::gsub_1, dl, MVT::i32); SDNode *ResNode = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG, dl, MVT::i32, SDValue(Ld, 0), SubRegIdx); Result = SDValue(ResNode,0); } ReplaceUses(SDValue(N, 1), Result); } ReplaceUses(SDValue(N, 2), OutChain); CurDAG->RemoveDeadNode(N); return; } case Intrinsic::arm_stlexd: case Intrinsic::arm_strexd: { SDLoc dl(N); SDValue Chain = N->getOperand(0); SDValue Val0 = N->getOperand(2); SDValue Val1 = N->getOperand(3); SDValue MemAddr = N->getOperand(4); // Store exclusive double return a i32 value which is the return status // of the issued store. const EVT ResTys[] = {MVT::i32, MVT::Other}; bool isThumb = Subtarget->isThumb() && Subtarget->hasThumb2(); // Place arguments in the right order. SmallVector Ops; if (isThumb) { Ops.push_back(Val0); Ops.push_back(Val1); } else // arm_strexd uses GPRPair. Ops.push_back(SDValue(createGPRPairNode(MVT::Untyped, Val0, Val1), 0)); Ops.push_back(MemAddr); Ops.push_back(getAL(CurDAG, dl)); Ops.push_back(CurDAG->getRegister(0, MVT::i32)); Ops.push_back(Chain); bool IsRelease = IntNo == Intrinsic::arm_stlexd; unsigned NewOpc = isThumb ? (IsRelease ? ARM::t2STLEXD : ARM::t2STREXD) : (IsRelease ? ARM::STLEXD : ARM::STREXD); SDNode *St = CurDAG->getMachineNode(NewOpc, dl, ResTys, Ops); // Transfer memoperands. MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1); MemOp[0] = cast(N)->getMemOperand(); cast(St)->setMemRefs(MemOp, MemOp + 1); ReplaceNode(N, St); return; } case Intrinsic::arm_neon_vld1: { static const uint16_t DOpcodes[] = { ARM::VLD1d8, ARM::VLD1d16, ARM::VLD1d32, ARM::VLD1d64 }; static const uint16_t QOpcodes[] = { ARM::VLD1q8, ARM::VLD1q16, ARM::VLD1q32, ARM::VLD1q64}; SelectVLD(N, false, 1, DOpcodes, QOpcodes, nullptr); return; } case Intrinsic::arm_neon_vld2: { static const uint16_t DOpcodes[] = { ARM::VLD2d8, ARM::VLD2d16, ARM::VLD2d32, ARM::VLD1q64 }; static const uint16_t QOpcodes[] = { ARM::VLD2q8Pseudo, ARM::VLD2q16Pseudo, ARM::VLD2q32Pseudo }; SelectVLD(N, false, 2, DOpcodes, QOpcodes, nullptr); return; } case Intrinsic::arm_neon_vld3: { static const uint16_t DOpcodes[] = { ARM::VLD3d8Pseudo, ARM::VLD3d16Pseudo, ARM::VLD3d32Pseudo, ARM::VLD1d64TPseudo }; static const uint16_t QOpcodes0[] = { ARM::VLD3q8Pseudo_UPD, ARM::VLD3q16Pseudo_UPD, ARM::VLD3q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VLD3q8oddPseudo, ARM::VLD3q16oddPseudo, ARM::VLD3q32oddPseudo }; SelectVLD(N, false, 3, DOpcodes, QOpcodes0, QOpcodes1); return; } case Intrinsic::arm_neon_vld4: { static const uint16_t DOpcodes[] = { ARM::VLD4d8Pseudo, ARM::VLD4d16Pseudo, ARM::VLD4d32Pseudo, ARM::VLD1d64QPseudo }; static const uint16_t QOpcodes0[] = { ARM::VLD4q8Pseudo_UPD, ARM::VLD4q16Pseudo_UPD, ARM::VLD4q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VLD4q8oddPseudo, ARM::VLD4q16oddPseudo, ARM::VLD4q32oddPseudo }; SelectVLD(N, false, 4, DOpcodes, QOpcodes0, QOpcodes1); return; } case Intrinsic::arm_neon_vld2lane: { static const uint16_t DOpcodes[] = { ARM::VLD2LNd8Pseudo, ARM::VLD2LNd16Pseudo, ARM::VLD2LNd32Pseudo }; static const uint16_t QOpcodes[] = { ARM::VLD2LNq16Pseudo, ARM::VLD2LNq32Pseudo }; SelectVLDSTLane(N, true, false, 2, DOpcodes, QOpcodes); return; } case Intrinsic::arm_neon_vld3lane: { static const uint16_t DOpcodes[] = { ARM::VLD3LNd8Pseudo, ARM::VLD3LNd16Pseudo, ARM::VLD3LNd32Pseudo }; static const uint16_t QOpcodes[] = { ARM::VLD3LNq16Pseudo, ARM::VLD3LNq32Pseudo }; SelectVLDSTLane(N, true, false, 3, DOpcodes, QOpcodes); return; } case Intrinsic::arm_neon_vld4lane: { static const uint16_t DOpcodes[] = { ARM::VLD4LNd8Pseudo, ARM::VLD4LNd16Pseudo, ARM::VLD4LNd32Pseudo }; static const uint16_t QOpcodes[] = { ARM::VLD4LNq16Pseudo, ARM::VLD4LNq32Pseudo }; SelectVLDSTLane(N, true, false, 4, DOpcodes, QOpcodes); return; } case Intrinsic::arm_neon_vst1: { static const uint16_t DOpcodes[] = { ARM::VST1d8, ARM::VST1d16, ARM::VST1d32, ARM::VST1d64 }; static const uint16_t QOpcodes[] = { ARM::VST1q8, ARM::VST1q16, ARM::VST1q32, ARM::VST1q64 }; SelectVST(N, false, 1, DOpcodes, QOpcodes, nullptr); return; } case Intrinsic::arm_neon_vst2: { static const uint16_t DOpcodes[] = { ARM::VST2d8, ARM::VST2d16, ARM::VST2d32, ARM::VST1q64 }; static const uint16_t QOpcodes[] = { ARM::VST2q8Pseudo, ARM::VST2q16Pseudo, ARM::VST2q32Pseudo }; SelectVST(N, false, 2, DOpcodes, QOpcodes, nullptr); return; } case Intrinsic::arm_neon_vst3: { static const uint16_t DOpcodes[] = { ARM::VST3d8Pseudo, ARM::VST3d16Pseudo, ARM::VST3d32Pseudo, ARM::VST1d64TPseudo }; static const uint16_t QOpcodes0[] = { ARM::VST3q8Pseudo_UPD, ARM::VST3q16Pseudo_UPD, ARM::VST3q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VST3q8oddPseudo, ARM::VST3q16oddPseudo, ARM::VST3q32oddPseudo }; SelectVST(N, false, 3, DOpcodes, QOpcodes0, QOpcodes1); return; } case Intrinsic::arm_neon_vst4: { static const uint16_t DOpcodes[] = { ARM::VST4d8Pseudo, ARM::VST4d16Pseudo, ARM::VST4d32Pseudo, ARM::VST1d64QPseudo }; static const uint16_t QOpcodes0[] = { ARM::VST4q8Pseudo_UPD, ARM::VST4q16Pseudo_UPD, ARM::VST4q32Pseudo_UPD }; static const uint16_t QOpcodes1[] = { ARM::VST4q8oddPseudo, ARM::VST4q16oddPseudo, ARM::VST4q32oddPseudo }; SelectVST(N, false, 4, DOpcodes, QOpcodes0, QOpcodes1); return; } case Intrinsic::arm_neon_vst2lane: { static const uint16_t DOpcodes[] = { ARM::VST2LNd8Pseudo, ARM::VST2LNd16Pseudo, ARM::VST2LNd32Pseudo }; static const uint16_t QOpcodes[] = { ARM::VST2LNq16Pseudo, ARM::VST2LNq32Pseudo }; SelectVLDSTLane(N, false, false, 2, DOpcodes, QOpcodes); return; } case Intrinsic::arm_neon_vst3lane: { static const uint16_t DOpcodes[] = { ARM::VST3LNd8Pseudo, ARM::VST3LNd16Pseudo, ARM::VST3LNd32Pseudo }; static const uint16_t QOpcodes[] = { ARM::VST3LNq16Pseudo, ARM::VST3LNq32Pseudo }; SelectVLDSTLane(N, false, false, 3, DOpcodes, QOpcodes); return; } case Intrinsic::arm_neon_vst4lane: { static const uint16_t DOpcodes[] = { ARM::VST4LNd8Pseudo, ARM::VST4LNd16Pseudo, ARM::VST4LNd32Pseudo }; static const uint16_t QOpcodes[] = { ARM::VST4LNq16Pseudo, ARM::VST4LNq32Pseudo }; SelectVLDSTLane(N, false, false, 4, DOpcodes, QOpcodes); return; } } break; } case ISD::ATOMIC_CMP_SWAP: SelectCMP_SWAP(N); return; } SelectCode(N); } // Inspect a register string of the form // cp::c:c: (32bit) or // cp::c (64bit) inspect the fields of the string // and obtain the integer operands from them, adding these operands to the // provided vector. static void getIntOperandsFromRegisterString(StringRef RegString, SelectionDAG *CurDAG, const SDLoc &DL, std::vector &Ops) { SmallVector Fields; RegString.split(Fields, ':'); if (Fields.size() > 1) { bool AllIntFields = true; for (StringRef Field : Fields) { // Need to trim out leading 'cp' characters and get the integer field. unsigned IntField; AllIntFields &= !Field.trim("CPcp").getAsInteger(10, IntField); Ops.push_back(CurDAG->getTargetConstant(IntField, DL, MVT::i32)); } assert(AllIntFields && "Unexpected non-integer value in special register string."); } } // Maps a Banked Register string to its mask value. The mask value returned is // for use in the MRSbanked / MSRbanked instruction nodes as the Banked Register // mask operand, which expresses which register is to be used, e.g. r8, and in // which mode it is to be used, e.g. usr. Returns -1 to signify that the string // was invalid. static inline int getBankedRegisterMask(StringRef RegString) { auto TheReg = ARMBankedReg::lookupBankedRegByName(RegString.lower()); if (!TheReg) return -1; return TheReg->Encoding; } // The flags here are common to those allowed for apsr in the A class cores and // those allowed for the special registers in the M class cores. Returns a // value representing which flags were present, -1 if invalid. static inline int getMClassFlagsMask(StringRef Flags) { return StringSwitch(Flags) .Case("", 0x2) // no flags means nzcvq for psr registers, and 0x2 is // correct when flags are not permitted .Case("g", 0x1) .Case("nzcvq", 0x2) .Case("nzcvqg", 0x3) .Default(-1); } // Maps MClass special registers string to its value for use in the // t2MRS_M/t2MSR_M instruction nodes as the SYSm value operand. // Returns -1 to signify that the string was invalid. static int getMClassRegisterMask(StringRef Reg, const ARMSubtarget *Subtarget) { auto TheReg = ARMSysReg::lookupMClassSysRegByName(Reg); const FeatureBitset &FeatureBits = Subtarget->getFeatureBits(); if (!TheReg || !TheReg->hasRequiredFeatures(FeatureBits)) return -1; return (int)(TheReg->Encoding & 0xFFF); // SYSm value } static int getARClassRegisterMask(StringRef Reg, StringRef Flags) { // The mask operand contains the special register (R Bit) in bit 4, whether // the register is spsr (R bit is 1) or one of cpsr/apsr (R bit is 0), and // bits 3-0 contains the fields to be accessed in the special register, set by // the flags provided with the register. int Mask = 0; if (Reg == "apsr") { // The flags permitted for apsr are the same flags that are allowed in // M class registers. We get the flag value and then shift the flags into // the correct place to combine with the mask. Mask = getMClassFlagsMask(Flags); if (Mask == -1) return -1; return Mask << 2; } if (Reg != "cpsr" && Reg != "spsr") { return -1; } // This is the same as if the flags were "fc" if (Flags.empty() || Flags == "all") return Mask | 0x9; // Inspect the supplied flags string and set the bits in the mask for // the relevant and valid flags allowed for cpsr and spsr. for (char Flag : Flags) { int FlagVal; switch (Flag) { case 'c': FlagVal = 0x1; break; case 'x': FlagVal = 0x2; break; case 's': FlagVal = 0x4; break; case 'f': FlagVal = 0x8; break; default: FlagVal = 0; } // This avoids allowing strings where the same flag bit appears twice. if (!FlagVal || (Mask & FlagVal)) return -1; Mask |= FlagVal; } // If the register is spsr then we need to set the R bit. if (Reg == "spsr") Mask |= 0x10; return Mask; } // Lower the read_register intrinsic to ARM specific DAG nodes // using the supplied metadata string to select the instruction node to use // and the registers/masks to construct as operands for the node. bool ARMDAGToDAGISel::tryReadRegister(SDNode *N){ const MDNodeSDNode *MD = dyn_cast(N->getOperand(1)); const MDString *RegString = dyn_cast(MD->getMD()->getOperand(0)); bool IsThumb2 = Subtarget->isThumb2(); SDLoc DL(N); std::vector Ops; getIntOperandsFromRegisterString(RegString->getString(), CurDAG, DL, Ops); if (!Ops.empty()) { // If the special register string was constructed of fields (as defined // in the ACLE) then need to lower to MRC node (32 bit) or // MRRC node(64 bit), we can make the distinction based on the number of // operands we have. unsigned Opcode; SmallVector ResTypes; if (Ops.size() == 5){ Opcode = IsThumb2 ? ARM::t2MRC : ARM::MRC; ResTypes.append({ MVT::i32, MVT::Other }); } else { assert(Ops.size() == 3 && "Invalid number of fields in special register string."); Opcode = IsThumb2 ? ARM::t2MRRC : ARM::MRRC; ResTypes.append({ MVT::i32, MVT::i32, MVT::Other }); } Ops.push_back(getAL(CurDAG, DL)); Ops.push_back(CurDAG->getRegister(0, MVT::i32)); Ops.push_back(N->getOperand(0)); ReplaceNode(N, CurDAG->getMachineNode(Opcode, DL, ResTypes, Ops)); return true; } std::string SpecialReg = RegString->getString().lower(); int BankedReg = getBankedRegisterMask(SpecialReg); if (BankedReg != -1) { Ops = { CurDAG->getTargetConstant(BankedReg, DL, MVT::i32), getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode( N, CurDAG->getMachineNode(IsThumb2 ? ARM::t2MRSbanked : ARM::MRSbanked, DL, MVT::i32, MVT::Other, Ops)); return true; } // The VFP registers are read by creating SelectionDAG nodes with opcodes // corresponding to the register that is being read from. So we switch on the // string to find which opcode we need to use. unsigned Opcode = StringSwitch(SpecialReg) .Case("fpscr", ARM::VMRS) .Case("fpexc", ARM::VMRS_FPEXC) .Case("fpsid", ARM::VMRS_FPSID) .Case("mvfr0", ARM::VMRS_MVFR0) .Case("mvfr1", ARM::VMRS_MVFR1) .Case("mvfr2", ARM::VMRS_MVFR2) .Case("fpinst", ARM::VMRS_FPINST) .Case("fpinst2", ARM::VMRS_FPINST2) .Default(0); // If an opcode was found then we can lower the read to a VFP instruction. if (Opcode) { if (!Subtarget->hasVFP2()) return false; if (Opcode == ARM::VMRS_MVFR2 && !Subtarget->hasFPARMv8()) return false; Ops = { getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode(N, CurDAG->getMachineNode(Opcode, DL, MVT::i32, MVT::Other, Ops)); return true; } // If the target is M Class then need to validate that the register string // is an acceptable value, so check that a mask can be constructed from the // string. if (Subtarget->isMClass()) { int SYSmValue = getMClassRegisterMask(SpecialReg, Subtarget); if (SYSmValue == -1) return false; SDValue Ops[] = { CurDAG->getTargetConstant(SYSmValue, DL, MVT::i32), getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode( N, CurDAG->getMachineNode(ARM::t2MRS_M, DL, MVT::i32, MVT::Other, Ops)); return true; } // Here we know the target is not M Class so we need to check if it is one // of the remaining possible values which are apsr, cpsr or spsr. if (SpecialReg == "apsr" || SpecialReg == "cpsr") { Ops = { getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode(N, CurDAG->getMachineNode(IsThumb2 ? ARM::t2MRS_AR : ARM::MRS, DL, MVT::i32, MVT::Other, Ops)); return true; } if (SpecialReg == "spsr") { Ops = { getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode( N, CurDAG->getMachineNode(IsThumb2 ? ARM::t2MRSsys_AR : ARM::MRSsys, DL, MVT::i32, MVT::Other, Ops)); return true; } return false; } // Lower the write_register intrinsic to ARM specific DAG nodes // using the supplied metadata string to select the instruction node to use // and the registers/masks to use in the nodes bool ARMDAGToDAGISel::tryWriteRegister(SDNode *N){ const MDNodeSDNode *MD = dyn_cast(N->getOperand(1)); const MDString *RegString = dyn_cast(MD->getMD()->getOperand(0)); bool IsThumb2 = Subtarget->isThumb2(); SDLoc DL(N); std::vector Ops; getIntOperandsFromRegisterString(RegString->getString(), CurDAG, DL, Ops); if (!Ops.empty()) { // If the special register string was constructed of fields (as defined // in the ACLE) then need to lower to MCR node (32 bit) or // MCRR node(64 bit), we can make the distinction based on the number of // operands we have. unsigned Opcode; if (Ops.size() == 5) { Opcode = IsThumb2 ? ARM::t2MCR : ARM::MCR; Ops.insert(Ops.begin()+2, N->getOperand(2)); } else { assert(Ops.size() == 3 && "Invalid number of fields in special register string."); Opcode = IsThumb2 ? ARM::t2MCRR : ARM::MCRR; SDValue WriteValue[] = { N->getOperand(2), N->getOperand(3) }; Ops.insert(Ops.begin()+2, WriteValue, WriteValue+2); } Ops.push_back(getAL(CurDAG, DL)); Ops.push_back(CurDAG->getRegister(0, MVT::i32)); Ops.push_back(N->getOperand(0)); ReplaceNode(N, CurDAG->getMachineNode(Opcode, DL, MVT::Other, Ops)); return true; } std::string SpecialReg = RegString->getString().lower(); int BankedReg = getBankedRegisterMask(SpecialReg); if (BankedReg != -1) { Ops = { CurDAG->getTargetConstant(BankedReg, DL, MVT::i32), N->getOperand(2), getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode( N, CurDAG->getMachineNode(IsThumb2 ? ARM::t2MSRbanked : ARM::MSRbanked, DL, MVT::Other, Ops)); return true; } // The VFP registers are written to by creating SelectionDAG nodes with // opcodes corresponding to the register that is being written. So we switch // on the string to find which opcode we need to use. unsigned Opcode = StringSwitch(SpecialReg) .Case("fpscr", ARM::VMSR) .Case("fpexc", ARM::VMSR_FPEXC) .Case("fpsid", ARM::VMSR_FPSID) .Case("fpinst", ARM::VMSR_FPINST) .Case("fpinst2", ARM::VMSR_FPINST2) .Default(0); if (Opcode) { if (!Subtarget->hasVFP2()) return false; Ops = { N->getOperand(2), getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode(N, CurDAG->getMachineNode(Opcode, DL, MVT::Other, Ops)); return true; } std::pair Fields; Fields = StringRef(SpecialReg).rsplit('_'); std::string Reg = Fields.first.str(); StringRef Flags = Fields.second; // If the target was M Class then need to validate the special register value // and retrieve the mask for use in the instruction node. if (Subtarget->isMClass()) { int SYSmValue = getMClassRegisterMask(SpecialReg, Subtarget); if (SYSmValue == -1) return false; SDValue Ops[] = { CurDAG->getTargetConstant(SYSmValue, DL, MVT::i32), N->getOperand(2), getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode(N, CurDAG->getMachineNode(ARM::t2MSR_M, DL, MVT::Other, Ops)); return true; } // We then check to see if a valid mask can be constructed for one of the // register string values permitted for the A and R class cores. These values // are apsr, spsr and cpsr; these are also valid on older cores. int Mask = getARClassRegisterMask(Reg, Flags); if (Mask != -1) { Ops = { CurDAG->getTargetConstant(Mask, DL, MVT::i32), N->getOperand(2), getAL(CurDAG, DL), CurDAG->getRegister(0, MVT::i32), N->getOperand(0) }; ReplaceNode(N, CurDAG->getMachineNode(IsThumb2 ? ARM::t2MSR_AR : ARM::MSR, DL, MVT::Other, Ops)); return true; } return false; } bool ARMDAGToDAGISel::tryInlineAsm(SDNode *N){ std::vector AsmNodeOperands; unsigned Flag, Kind; bool Changed = false; unsigned NumOps = N->getNumOperands(); // Normally, i64 data is bounded to two arbitrary GRPs for "%r" constraint. // However, some instrstions (e.g. ldrexd/strexd in ARM mode) require // (even/even+1) GPRs and use %n and %Hn to refer to the individual regs // respectively. Since there is no constraint to explicitly specify a // reg pair, we use GPRPair reg class for "%r" for 64-bit data. For Thumb, // the 64-bit data may be referred by H, Q, R modifiers, so we still pack // them into a GPRPair. SDLoc dl(N); SDValue Glue = N->getGluedNode() ? N->getOperand(NumOps-1) : SDValue(nullptr,0); SmallVector OpChanged; // Glue node will be appended late. for(unsigned i = 0, e = N->getGluedNode() ? NumOps - 1 : NumOps; i < e; ++i) { SDValue op = N->getOperand(i); AsmNodeOperands.push_back(op); if (i < InlineAsm::Op_FirstOperand) continue; if (ConstantSDNode *C = dyn_cast(N->getOperand(i))) { Flag = C->getZExtValue(); Kind = InlineAsm::getKind(Flag); } else continue; // Immediate operands to inline asm in the SelectionDAG are modeled with // two operands. The first is a constant of value InlineAsm::Kind_Imm, and // the second is a constant with the value of the immediate. If we get here // and we have a Kind_Imm, skip the next operand, and continue. if (Kind == InlineAsm::Kind_Imm) { SDValue op = N->getOperand(++i); AsmNodeOperands.push_back(op); continue; } unsigned NumRegs = InlineAsm::getNumOperandRegisters(Flag); if (NumRegs) OpChanged.push_back(false); unsigned DefIdx = 0; bool IsTiedToChangedOp = false; // If it's a use that is tied with a previous def, it has no // reg class constraint. if (Changed && InlineAsm::isUseOperandTiedToDef(Flag, DefIdx)) IsTiedToChangedOp = OpChanged[DefIdx]; // Memory operands to inline asm in the SelectionDAG are modeled with two // operands: a constant of value InlineAsm::Kind_Mem followed by the input // operand. If we get here and we have a Kind_Mem, skip the next operand (so // it doesn't get misinterpreted), and continue. We do this here because // it's important to update the OpChanged array correctly before moving on. if (Kind == InlineAsm::Kind_Mem) { SDValue op = N->getOperand(++i); AsmNodeOperands.push_back(op); continue; } if (Kind != InlineAsm::Kind_RegUse && Kind != InlineAsm::Kind_RegDef && Kind != InlineAsm::Kind_RegDefEarlyClobber) continue; unsigned RC; bool HasRC = InlineAsm::hasRegClassConstraint(Flag, RC); if ((!IsTiedToChangedOp && (!HasRC || RC != ARM::GPRRegClassID)) || NumRegs != 2) continue; assert((i+2 < NumOps) && "Invalid number of operands in inline asm"); SDValue V0 = N->getOperand(i+1); SDValue V1 = N->getOperand(i+2); unsigned Reg0 = cast(V0)->getReg(); unsigned Reg1 = cast(V1)->getReg(); SDValue PairedReg; MachineRegisterInfo &MRI = MF->getRegInfo(); if (Kind == InlineAsm::Kind_RegDef || Kind == InlineAsm::Kind_RegDefEarlyClobber) { // Replace the two GPRs with 1 GPRPair and copy values from GPRPair to // the original GPRs. unsigned GPVR = MRI.createVirtualRegister(&ARM::GPRPairRegClass); PairedReg = CurDAG->getRegister(GPVR, MVT::Untyped); SDValue Chain = SDValue(N,0); SDNode *GU = N->getGluedUser(); SDValue RegCopy = CurDAG->getCopyFromReg(Chain, dl, GPVR, MVT::Untyped, Chain.getValue(1)); // Extract values from a GPRPair reg and copy to the original GPR reg. SDValue Sub0 = CurDAG->getTargetExtractSubreg(ARM::gsub_0, dl, MVT::i32, RegCopy); SDValue Sub1 = CurDAG->getTargetExtractSubreg(ARM::gsub_1, dl, MVT::i32, RegCopy); SDValue T0 = CurDAG->getCopyToReg(Sub0, dl, Reg0, Sub0, RegCopy.getValue(1)); SDValue T1 = CurDAG->getCopyToReg(Sub1, dl, Reg1, Sub1, T0.getValue(1)); // Update the original glue user. std::vector Ops(GU->op_begin(), GU->op_end()-1); Ops.push_back(T1.getValue(1)); CurDAG->UpdateNodeOperands(GU, Ops); } else { // For Kind == InlineAsm::Kind_RegUse, we first copy two GPRs into a // GPRPair and then pass the GPRPair to the inline asm. SDValue Chain = AsmNodeOperands[InlineAsm::Op_InputChain]; // As REG_SEQ doesn't take RegisterSDNode, we copy them first. SDValue T0 = CurDAG->getCopyFromReg(Chain, dl, Reg0, MVT::i32, Chain.getValue(1)); SDValue T1 = CurDAG->getCopyFromReg(Chain, dl, Reg1, MVT::i32, T0.getValue(1)); SDValue Pair = SDValue(createGPRPairNode(MVT::Untyped, T0, T1), 0); // Copy REG_SEQ into a GPRPair-typed VR and replace the original two // i32 VRs of inline asm with it. unsigned GPVR = MRI.createVirtualRegister(&ARM::GPRPairRegClass); PairedReg = CurDAG->getRegister(GPVR, MVT::Untyped); Chain = CurDAG->getCopyToReg(T1, dl, GPVR, Pair, T1.getValue(1)); AsmNodeOperands[InlineAsm::Op_InputChain] = Chain; Glue = Chain.getValue(1); } Changed = true; if(PairedReg.getNode()) { OpChanged[OpChanged.size() -1 ] = true; Flag = InlineAsm::getFlagWord(Kind, 1 /* RegNum*/); if (IsTiedToChangedOp) Flag = InlineAsm::getFlagWordForMatchingOp(Flag, DefIdx); else Flag = InlineAsm::getFlagWordForRegClass(Flag, ARM::GPRPairRegClassID); // Replace the current flag. AsmNodeOperands[AsmNodeOperands.size() -1] = CurDAG->getTargetConstant( Flag, dl, MVT::i32); // Add the new register node and skip the original two GPRs. AsmNodeOperands.push_back(PairedReg); // Skip the next two GPRs. i += 2; } } if (Glue.getNode()) AsmNodeOperands.push_back(Glue); if (!Changed) return false; SDValue New = CurDAG->getNode(ISD::INLINEASM, SDLoc(N), CurDAG->getVTList(MVT::Other, MVT::Glue), AsmNodeOperands); New->setNodeId(-1); ReplaceNode(N, New.getNode()); return true; } bool ARMDAGToDAGISel:: SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID, std::vector &OutOps) { switch(ConstraintID) { default: llvm_unreachable("Unexpected asm memory constraint"); case InlineAsm::Constraint_i: // FIXME: It seems strange that 'i' is needed here since it's supposed to // be an immediate and not a memory constraint. LLVM_FALLTHROUGH; case InlineAsm::Constraint_m: case InlineAsm::Constraint_o: case InlineAsm::Constraint_Q: case InlineAsm::Constraint_Um: case InlineAsm::Constraint_Un: case InlineAsm::Constraint_Uq: case InlineAsm::Constraint_Us: case InlineAsm::Constraint_Ut: case InlineAsm::Constraint_Uv: case InlineAsm::Constraint_Uy: // Require the address to be in a register. That is safe for all ARM // variants and it is hard to do anything much smarter without knowing // how the operand is used. OutOps.push_back(Op); return false; } return true; } /// createARMISelDag - This pass converts a legalized DAG into a /// ARM-specific DAG, ready for instruction scheduling. /// FunctionPass *llvm::createARMISelDag(ARMBaseTargetMachine &TM, CodeGenOpt::Level OptLevel) { return new ARMDAGToDAGISel(TM, OptLevel); }