| //===-- MipsSEInstrInfo.cpp - Mips32/64 Instruction Information -----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the Mips32/64 implementation of the TargetInstrInfo class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MipsSEInstrInfo.h" |
| #include "InstPrinter/MipsInstPrinter.h" |
| #include "MipsMachineFunction.h" |
| #include "MipsTargetMachine.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/TargetRegistry.h" |
| |
| using namespace llvm; |
| |
| MipsSEInstrInfo::MipsSEInstrInfo(const MipsSubtarget &STI) |
| : MipsInstrInfo(STI, STI.getRelocationModel() == Reloc::PIC_ ? Mips::B |
| : Mips::J), |
| RI() {} |
| |
| const MipsRegisterInfo &MipsSEInstrInfo::getRegisterInfo() const { |
| return RI; |
| } |
| |
| /// isLoadFromStackSlot - If the specified machine instruction is a direct |
| /// load from a stack slot, return the virtual or physical register number of |
| /// the destination along with the FrameIndex of the loaded stack slot. If |
| /// not, return 0. This predicate must return 0 if the instruction has |
| /// any side effects other than loading from the stack slot. |
| unsigned MipsSEInstrInfo::isLoadFromStackSlot(const MachineInstr *MI, |
| int &FrameIndex) const { |
| unsigned Opc = MI->getOpcode(); |
| |
| if ((Opc == Mips::LW) || (Opc == Mips::LD) || |
| (Opc == Mips::LWC1) || (Opc == Mips::LDC1) || (Opc == Mips::LDC164)) { |
| if ((MI->getOperand(1).isFI()) && // is a stack slot |
| (MI->getOperand(2).isImm()) && // the imm is zero |
| (isZeroImm(MI->getOperand(2)))) { |
| FrameIndex = MI->getOperand(1).getIndex(); |
| return MI->getOperand(0).getReg(); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /// isStoreToStackSlot - If the specified machine instruction is a direct |
| /// store to a stack slot, return the virtual or physical register number of |
| /// the source reg along with the FrameIndex of the loaded stack slot. If |
| /// not, return 0. This predicate must return 0 if the instruction has |
| /// any side effects other than storing to the stack slot. |
| unsigned MipsSEInstrInfo::isStoreToStackSlot(const MachineInstr *MI, |
| int &FrameIndex) const { |
| unsigned Opc = MI->getOpcode(); |
| |
| if ((Opc == Mips::SW) || (Opc == Mips::SD) || |
| (Opc == Mips::SWC1) || (Opc == Mips::SDC1) || (Opc == Mips::SDC164)) { |
| if ((MI->getOperand(1).isFI()) && // is a stack slot |
| (MI->getOperand(2).isImm()) && // the imm is zero |
| (isZeroImm(MI->getOperand(2)))) { |
| FrameIndex = MI->getOperand(1).getIndex(); |
| return MI->getOperand(0).getReg(); |
| } |
| } |
| return 0; |
| } |
| |
| void MipsSEInstrInfo::copyPhysReg(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, DebugLoc DL, |
| unsigned DestReg, unsigned SrcReg, |
| bool KillSrc) const { |
| unsigned Opc = 0, ZeroReg = 0; |
| bool isMicroMips = Subtarget.inMicroMipsMode(); |
| |
| if (Mips::GPR32RegClass.contains(DestReg)) { // Copy to CPU Reg. |
| if (Mips::GPR32RegClass.contains(SrcReg)) { |
| if (isMicroMips) |
| Opc = Mips::MOVE16_MM; |
| else |
| Opc = Mips::ADDu, ZeroReg = Mips::ZERO; |
| } else if (Mips::CCRRegClass.contains(SrcReg)) |
| Opc = Mips::CFC1; |
| else if (Mips::FGR32RegClass.contains(SrcReg)) |
| Opc = Mips::MFC1; |
| else if (Mips::HI32RegClass.contains(SrcReg)) { |
| Opc = isMicroMips ? Mips::MFHI16_MM : Mips::MFHI; |
| SrcReg = 0; |
| } else if (Mips::LO32RegClass.contains(SrcReg)) { |
| Opc = isMicroMips ? Mips::MFLO16_MM : Mips::MFLO; |
| SrcReg = 0; |
| } else if (Mips::HI32DSPRegClass.contains(SrcReg)) |
| Opc = Mips::MFHI_DSP; |
| else if (Mips::LO32DSPRegClass.contains(SrcReg)) |
| Opc = Mips::MFLO_DSP; |
| else if (Mips::DSPCCRegClass.contains(SrcReg)) { |
| BuildMI(MBB, I, DL, get(Mips::RDDSP), DestReg).addImm(1 << 4) |
| .addReg(SrcReg, RegState::Implicit | getKillRegState(KillSrc)); |
| return; |
| } |
| else if (Mips::MSACtrlRegClass.contains(SrcReg)) |
| Opc = Mips::CFCMSA; |
| } |
| else if (Mips::GPR32RegClass.contains(SrcReg)) { // Copy from CPU Reg. |
| if (Mips::CCRRegClass.contains(DestReg)) |
| Opc = Mips::CTC1; |
| else if (Mips::FGR32RegClass.contains(DestReg)) |
| Opc = Mips::MTC1; |
| else if (Mips::HI32RegClass.contains(DestReg)) |
| Opc = Mips::MTHI, DestReg = 0; |
| else if (Mips::LO32RegClass.contains(DestReg)) |
| Opc = Mips::MTLO, DestReg = 0; |
| else if (Mips::HI32DSPRegClass.contains(DestReg)) |
| Opc = Mips::MTHI_DSP; |
| else if (Mips::LO32DSPRegClass.contains(DestReg)) |
| Opc = Mips::MTLO_DSP; |
| else if (Mips::DSPCCRegClass.contains(DestReg)) { |
| BuildMI(MBB, I, DL, get(Mips::WRDSP)) |
| .addReg(SrcReg, getKillRegState(KillSrc)).addImm(1 << 4) |
| .addReg(DestReg, RegState::ImplicitDefine); |
| return; |
| } |
| else if (Mips::MSACtrlRegClass.contains(DestReg)) |
| Opc = Mips::CTCMSA; |
| } |
| else if (Mips::FGR32RegClass.contains(DestReg, SrcReg)) |
| Opc = Mips::FMOV_S; |
| else if (Mips::AFGR64RegClass.contains(DestReg, SrcReg)) |
| Opc = Mips::FMOV_D32; |
| else if (Mips::FGR64RegClass.contains(DestReg, SrcReg)) |
| Opc = Mips::FMOV_D64; |
| else if (Mips::GPR64RegClass.contains(DestReg)) { // Copy to CPU64 Reg. |
| if (Mips::GPR64RegClass.contains(SrcReg)) |
| Opc = Mips::DADDu, ZeroReg = Mips::ZERO_64; |
| else if (Mips::HI64RegClass.contains(SrcReg)) |
| Opc = Mips::MFHI64, SrcReg = 0; |
| else if (Mips::LO64RegClass.contains(SrcReg)) |
| Opc = Mips::MFLO64, SrcReg = 0; |
| else if (Mips::FGR64RegClass.contains(SrcReg)) |
| Opc = Mips::DMFC1; |
| } |
| else if (Mips::GPR64RegClass.contains(SrcReg)) { // Copy from CPU64 Reg. |
| if (Mips::HI64RegClass.contains(DestReg)) |
| Opc = Mips::MTHI64, DestReg = 0; |
| else if (Mips::LO64RegClass.contains(DestReg)) |
| Opc = Mips::MTLO64, DestReg = 0; |
| else if (Mips::FGR64RegClass.contains(DestReg)) |
| Opc = Mips::DMTC1; |
| } |
| else if (Mips::MSA128BRegClass.contains(DestReg)) { // Copy to MSA reg |
| if (Mips::MSA128BRegClass.contains(SrcReg)) |
| Opc = Mips::MOVE_V; |
| } |
| |
| assert(Opc && "Cannot copy registers"); |
| |
| MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(Opc)); |
| |
| if (DestReg) |
| MIB.addReg(DestReg, RegState::Define); |
| |
| if (SrcReg) |
| MIB.addReg(SrcReg, getKillRegState(KillSrc)); |
| |
| if (ZeroReg) |
| MIB.addReg(ZeroReg); |
| } |
| |
| void MipsSEInstrInfo:: |
| storeRegToStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| unsigned SrcReg, bool isKill, int FI, |
| const TargetRegisterClass *RC, const TargetRegisterInfo *TRI, |
| int64_t Offset) const { |
| DebugLoc DL; |
| if (I != MBB.end()) DL = I->getDebugLoc(); |
| MachineMemOperand *MMO = GetMemOperand(MBB, FI, MachineMemOperand::MOStore); |
| |
| unsigned Opc = 0; |
| |
| if (Mips::GPR32RegClass.hasSubClassEq(RC)) |
| Opc = Mips::SW; |
| else if (Mips::GPR64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::SD; |
| else if (Mips::ACC64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::STORE_ACC64; |
| else if (Mips::ACC64DSPRegClass.hasSubClassEq(RC)) |
| Opc = Mips::STORE_ACC64DSP; |
| else if (Mips::ACC128RegClass.hasSubClassEq(RC)) |
| Opc = Mips::STORE_ACC128; |
| else if (Mips::DSPCCRegClass.hasSubClassEq(RC)) |
| Opc = Mips::STORE_CCOND_DSP; |
| else if (Mips::FGR32RegClass.hasSubClassEq(RC)) |
| Opc = Mips::SWC1; |
| else if (Mips::AFGR64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::SDC1; |
| else if (Mips::FGR64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::SDC164; |
| else if (RC->hasType(MVT::v16i8)) |
| Opc = Mips::ST_B; |
| else if (RC->hasType(MVT::v8i16) || RC->hasType(MVT::v8f16)) |
| Opc = Mips::ST_H; |
| else if (RC->hasType(MVT::v4i32) || RC->hasType(MVT::v4f32)) |
| Opc = Mips::ST_W; |
| else if (RC->hasType(MVT::v2i64) || RC->hasType(MVT::v2f64)) |
| Opc = Mips::ST_D; |
| |
| assert(Opc && "Register class not handled!"); |
| BuildMI(MBB, I, DL, get(Opc)).addReg(SrcReg, getKillRegState(isKill)) |
| .addFrameIndex(FI).addImm(Offset).addMemOperand(MMO); |
| } |
| |
| void MipsSEInstrInfo:: |
| loadRegFromStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| unsigned DestReg, int FI, const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI, int64_t Offset) const { |
| DebugLoc DL; |
| if (I != MBB.end()) DL = I->getDebugLoc(); |
| MachineMemOperand *MMO = GetMemOperand(MBB, FI, MachineMemOperand::MOLoad); |
| unsigned Opc = 0; |
| |
| if (Mips::GPR32RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LW; |
| else if (Mips::GPR64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LD; |
| else if (Mips::ACC64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LOAD_ACC64; |
| else if (Mips::ACC64DSPRegClass.hasSubClassEq(RC)) |
| Opc = Mips::LOAD_ACC64DSP; |
| else if (Mips::ACC128RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LOAD_ACC128; |
| else if (Mips::DSPCCRegClass.hasSubClassEq(RC)) |
| Opc = Mips::LOAD_CCOND_DSP; |
| else if (Mips::FGR32RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LWC1; |
| else if (Mips::AFGR64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LDC1; |
| else if (Mips::FGR64RegClass.hasSubClassEq(RC)) |
| Opc = Mips::LDC164; |
| else if (RC->hasType(MVT::v16i8)) |
| Opc = Mips::LD_B; |
| else if (RC->hasType(MVT::v8i16) || RC->hasType(MVT::v8f16)) |
| Opc = Mips::LD_H; |
| else if (RC->hasType(MVT::v4i32) || RC->hasType(MVT::v4f32)) |
| Opc = Mips::LD_W; |
| else if (RC->hasType(MVT::v2i64) || RC->hasType(MVT::v2f64)) |
| Opc = Mips::LD_D; |
| |
| assert(Opc && "Register class not handled!"); |
| BuildMI(MBB, I, DL, get(Opc), DestReg).addFrameIndex(FI).addImm(Offset) |
| .addMemOperand(MMO); |
| } |
| |
| bool MipsSEInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const { |
| MachineBasicBlock &MBB = *MI->getParent(); |
| bool isMicroMips = Subtarget.inMicroMipsMode(); |
| unsigned Opc; |
| |
| switch(MI->getDesc().getOpcode()) { |
| default: |
| return false; |
| case Mips::RetRA: |
| expandRetRA(MBB, MI); |
| break; |
| case Mips::PseudoMFHI: |
| Opc = isMicroMips ? Mips::MFHI16_MM : Mips::MFHI; |
| expandPseudoMFHiLo(MBB, MI, Opc); |
| break; |
| case Mips::PseudoMFLO: |
| Opc = isMicroMips ? Mips::MFLO16_MM : Mips::MFLO; |
| expandPseudoMFHiLo(MBB, MI, Opc); |
| break; |
| case Mips::PseudoMFHI64: |
| expandPseudoMFHiLo(MBB, MI, Mips::MFHI64); |
| break; |
| case Mips::PseudoMFLO64: |
| expandPseudoMFHiLo(MBB, MI, Mips::MFLO64); |
| break; |
| case Mips::PseudoMTLOHI: |
| expandPseudoMTLoHi(MBB, MI, Mips::MTLO, Mips::MTHI, false); |
| break; |
| case Mips::PseudoMTLOHI64: |
| expandPseudoMTLoHi(MBB, MI, Mips::MTLO64, Mips::MTHI64, false); |
| break; |
| case Mips::PseudoMTLOHI_DSP: |
| expandPseudoMTLoHi(MBB, MI, Mips::MTLO_DSP, Mips::MTHI_DSP, true); |
| break; |
| case Mips::PseudoCVT_S_W: |
| expandCvtFPInt(MBB, MI, Mips::CVT_S_W, Mips::MTC1, false); |
| break; |
| case Mips::PseudoCVT_D32_W: |
| expandCvtFPInt(MBB, MI, Mips::CVT_D32_W, Mips::MTC1, false); |
| break; |
| case Mips::PseudoCVT_S_L: |
| expandCvtFPInt(MBB, MI, Mips::CVT_S_L, Mips::DMTC1, true); |
| break; |
| case Mips::PseudoCVT_D64_W: |
| expandCvtFPInt(MBB, MI, Mips::CVT_D64_W, Mips::MTC1, true); |
| break; |
| case Mips::PseudoCVT_D64_L: |
| expandCvtFPInt(MBB, MI, Mips::CVT_D64_L, Mips::DMTC1, true); |
| break; |
| case Mips::BuildPairF64: |
| expandBuildPairF64(MBB, MI, false); |
| break; |
| case Mips::BuildPairF64_64: |
| expandBuildPairF64(MBB, MI, true); |
| break; |
| case Mips::ExtractElementF64: |
| expandExtractElementF64(MBB, MI, false); |
| break; |
| case Mips::ExtractElementF64_64: |
| expandExtractElementF64(MBB, MI, true); |
| break; |
| case Mips::MIPSeh_return32: |
| case Mips::MIPSeh_return64: |
| expandEhReturn(MBB, MI); |
| break; |
| } |
| |
| MBB.erase(MI); |
| return true; |
| } |
| |
| /// getOppositeBranchOpc - Return the inverse of the specified |
| /// opcode, e.g. turning BEQ to BNE. |
| unsigned MipsSEInstrInfo::getOppositeBranchOpc(unsigned Opc) const { |
| switch (Opc) { |
| default: llvm_unreachable("Illegal opcode!"); |
| case Mips::BEQ: return Mips::BNE; |
| case Mips::BNE: return Mips::BEQ; |
| case Mips::BGTZ: return Mips::BLEZ; |
| case Mips::BGEZ: return Mips::BLTZ; |
| case Mips::BLTZ: return Mips::BGEZ; |
| case Mips::BLEZ: return Mips::BGTZ; |
| case Mips::BEQ64: return Mips::BNE64; |
| case Mips::BNE64: return Mips::BEQ64; |
| case Mips::BGTZ64: return Mips::BLEZ64; |
| case Mips::BGEZ64: return Mips::BLTZ64; |
| case Mips::BLTZ64: return Mips::BGEZ64; |
| case Mips::BLEZ64: return Mips::BGTZ64; |
| case Mips::BC1T: return Mips::BC1F; |
| case Mips::BC1F: return Mips::BC1T; |
| case Mips::BEQZC_MM: return Mips::BNEZC_MM; |
| case Mips::BNEZC_MM: return Mips::BEQZC_MM; |
| } |
| } |
| |
| /// Adjust SP by Amount bytes. |
| void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount, |
| MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I) const { |
| const MipsSubtarget &STI = Subtarget; |
| DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc(); |
| unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu; |
| unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu; |
| |
| if (Amount == 0) |
| return; |
| |
| if (isInt<16>(Amount))// addi sp, sp, amount |
| BuildMI(MBB, I, DL, get(ADDiu), SP).addReg(SP).addImm(Amount); |
| else { // Expand immediate that doesn't fit in 16-bit. |
| unsigned Reg = loadImmediate(Amount, MBB, I, DL, nullptr); |
| BuildMI(MBB, I, DL, get(ADDu), SP).addReg(SP).addReg(Reg, RegState::Kill); |
| } |
| } |
| |
| /// This function generates the sequence of instructions needed to get the |
| /// result of adding register REG and immediate IMM. |
| unsigned |
| MipsSEInstrInfo::loadImmediate(int64_t Imm, MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator II, DebugLoc DL, |
| unsigned *NewImm) const { |
| MipsAnalyzeImmediate AnalyzeImm; |
| const MipsSubtarget &STI = Subtarget; |
| MachineRegisterInfo &RegInfo = MBB.getParent()->getRegInfo(); |
| unsigned Size = STI.isABI_N64() ? 64 : 32; |
| unsigned LUi = STI.isABI_N64() ? Mips::LUi64 : Mips::LUi; |
| unsigned ZEROReg = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO; |
| const TargetRegisterClass *RC = STI.isABI_N64() ? |
| &Mips::GPR64RegClass : &Mips::GPR32RegClass; |
| bool LastInstrIsADDiu = NewImm; |
| |
| const MipsAnalyzeImmediate::InstSeq &Seq = |
| AnalyzeImm.Analyze(Imm, Size, LastInstrIsADDiu); |
| MipsAnalyzeImmediate::InstSeq::const_iterator Inst = Seq.begin(); |
| |
| assert(Seq.size() && (!LastInstrIsADDiu || (Seq.size() > 1))); |
| |
| // The first instruction can be a LUi, which is different from other |
| // instructions (ADDiu, ORI and SLL) in that it does not have a register |
| // operand. |
| unsigned Reg = RegInfo.createVirtualRegister(RC); |
| |
| if (Inst->Opc == LUi) |
| BuildMI(MBB, II, DL, get(LUi), Reg).addImm(SignExtend64<16>(Inst->ImmOpnd)); |
| else |
| BuildMI(MBB, II, DL, get(Inst->Opc), Reg).addReg(ZEROReg) |
| .addImm(SignExtend64<16>(Inst->ImmOpnd)); |
| |
| // Build the remaining instructions in Seq. |
| for (++Inst; Inst != Seq.end() - LastInstrIsADDiu; ++Inst) |
| BuildMI(MBB, II, DL, get(Inst->Opc), Reg).addReg(Reg, RegState::Kill) |
| .addImm(SignExtend64<16>(Inst->ImmOpnd)); |
| |
| if (LastInstrIsADDiu) |
| *NewImm = Inst->ImmOpnd; |
| |
| return Reg; |
| } |
| |
| unsigned MipsSEInstrInfo::getAnalyzableBrOpc(unsigned Opc) const { |
| return (Opc == Mips::BEQ || Opc == Mips::BNE || Opc == Mips::BGTZ || |
| Opc == Mips::BGEZ || Opc == Mips::BLTZ || Opc == Mips::BLEZ || |
| Opc == Mips::BEQ64 || Opc == Mips::BNE64 || Opc == Mips::BGTZ64 || |
| Opc == Mips::BGEZ64 || Opc == Mips::BLTZ64 || Opc == Mips::BLEZ64 || |
| Opc == Mips::BC1T || Opc == Mips::BC1F || Opc == Mips::B || |
| Opc == Mips::J || Opc == Mips::BEQZC_MM || Opc == Mips::BNEZC_MM) ? |
| Opc : 0; |
| } |
| |
| void MipsSEInstrInfo::expandRetRA(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I) const { |
| if (Subtarget.isGP64bit()) |
| BuildMI(MBB, I, I->getDebugLoc(), get(Mips::PseudoReturn64)) |
| .addReg(Mips::RA_64); |
| else |
| BuildMI(MBB, I, I->getDebugLoc(), get(Mips::PseudoReturn)).addReg(Mips::RA); |
| } |
| |
| std::pair<bool, bool> |
| MipsSEInstrInfo::compareOpndSize(unsigned Opc, |
| const MachineFunction &MF) const { |
| const MCInstrDesc &Desc = get(Opc); |
| assert(Desc.NumOperands == 2 && "Unary instruction expected."); |
| const MipsRegisterInfo *RI = &getRegisterInfo(); |
| unsigned DstRegSize = getRegClass(Desc, 0, RI, MF)->getSize(); |
| unsigned SrcRegSize = getRegClass(Desc, 1, RI, MF)->getSize(); |
| |
| return std::make_pair(DstRegSize > SrcRegSize, DstRegSize < SrcRegSize); |
| } |
| |
| void MipsSEInstrInfo::expandPseudoMFHiLo(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, |
| unsigned NewOpc) const { |
| BuildMI(MBB, I, I->getDebugLoc(), get(NewOpc), I->getOperand(0).getReg()); |
| } |
| |
| void MipsSEInstrInfo::expandPseudoMTLoHi(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, |
| unsigned LoOpc, |
| unsigned HiOpc, |
| bool HasExplicitDef) const { |
| // Expand |
| // lo_hi pseudomtlohi $gpr0, $gpr1 |
| // to these two instructions: |
| // mtlo $gpr0 |
| // mthi $gpr1 |
| |
| DebugLoc DL = I->getDebugLoc(); |
| const MachineOperand &SrcLo = I->getOperand(1), &SrcHi = I->getOperand(2); |
| MachineInstrBuilder LoInst = BuildMI(MBB, I, DL, get(LoOpc)); |
| MachineInstrBuilder HiInst = BuildMI(MBB, I, DL, get(HiOpc)); |
| LoInst.addReg(SrcLo.getReg(), getKillRegState(SrcLo.isKill())); |
| HiInst.addReg(SrcHi.getReg(), getKillRegState(SrcHi.isKill())); |
| |
| // Add lo/hi registers if the mtlo/hi instructions created have explicit |
| // def registers. |
| if (HasExplicitDef) { |
| unsigned DstReg = I->getOperand(0).getReg(); |
| unsigned DstLo = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo); |
| unsigned DstHi = getRegisterInfo().getSubReg(DstReg, Mips::sub_hi); |
| LoInst.addReg(DstLo, RegState::Define); |
| HiInst.addReg(DstHi, RegState::Define); |
| } |
| } |
| |
| void MipsSEInstrInfo::expandCvtFPInt(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, |
| unsigned CvtOpc, unsigned MovOpc, |
| bool IsI64) const { |
| const MCInstrDesc &CvtDesc = get(CvtOpc), &MovDesc = get(MovOpc); |
| const MachineOperand &Dst = I->getOperand(0), &Src = I->getOperand(1); |
| unsigned DstReg = Dst.getReg(), SrcReg = Src.getReg(), TmpReg = DstReg; |
| unsigned KillSrc = getKillRegState(Src.isKill()); |
| DebugLoc DL = I->getDebugLoc(); |
| bool DstIsLarger, SrcIsLarger; |
| |
| std::tie(DstIsLarger, SrcIsLarger) = |
| compareOpndSize(CvtOpc, *MBB.getParent()); |
| |
| if (DstIsLarger) |
| TmpReg = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo); |
| |
| if (SrcIsLarger) |
| DstReg = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo); |
| |
| BuildMI(MBB, I, DL, MovDesc, TmpReg).addReg(SrcReg, KillSrc); |
| BuildMI(MBB, I, DL, CvtDesc, DstReg).addReg(TmpReg, RegState::Kill); |
| } |
| |
| void MipsSEInstrInfo::expandExtractElementF64(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, |
| bool FP64) const { |
| unsigned DstReg = I->getOperand(0).getReg(); |
| unsigned SrcReg = I->getOperand(1).getReg(); |
| unsigned N = I->getOperand(2).getImm(); |
| DebugLoc dl = I->getDebugLoc(); |
| |
| assert(N < 2 && "Invalid immediate"); |
| unsigned SubIdx = N ? Mips::sub_hi : Mips::sub_lo; |
| unsigned SubReg = getRegisterInfo().getSubReg(SrcReg, SubIdx); |
| |
| // FPXX on MIPS-II or MIPS32r1 should have been handled with a spill/reload |
| // in MipsSEFrameLowering.cpp. |
| assert(!(Subtarget.isABI_FPXX() && !Subtarget.hasMips32r2())); |
| |
| // FP64A (FP64 with nooddspreg) should have been handled with a spill/reload |
| // in MipsSEFrameLowering.cpp. |
| assert(!(Subtarget.isFP64bit() && !Subtarget.useOddSPReg())); |
| |
| if (SubIdx == Mips::sub_hi && Subtarget.hasMTHC1()) { |
| // FIXME: Strictly speaking MFHC1 only reads the top 32-bits however, we |
| // claim to read the whole 64-bits as part of a white lie used to |
| // temporarily work around a widespread bug in the -mfp64 support. |
| // The problem is that none of the 32-bit fpu ops mention the fact |
| // that they clobber the upper 32-bits of the 64-bit FPR. Fixing that |
| // requires a major overhaul of the FPU implementation which can't |
| // be done right now due to time constraints. |
| // MFHC1 is one of two instructions that are affected since they are |
| // the only instructions that don't read the lower 32-bits. |
| // We therefore pretend that it reads the bottom 32-bits to |
| // artificially create a dependency and prevent the scheduler |
| // changing the behaviour of the code. |
| BuildMI(MBB, I, dl, get(FP64 ? Mips::MFHC1_D64 : Mips::MFHC1_D32), DstReg) |
| .addReg(SrcReg); |
| } else |
| BuildMI(MBB, I, dl, get(Mips::MFC1), DstReg).addReg(SubReg); |
| } |
| |
| void MipsSEInstrInfo::expandBuildPairF64(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, |
| bool FP64) const { |
| unsigned DstReg = I->getOperand(0).getReg(); |
| unsigned LoReg = I->getOperand(1).getReg(), HiReg = I->getOperand(2).getReg(); |
| const MCInstrDesc& Mtc1Tdd = get(Mips::MTC1); |
| DebugLoc dl = I->getDebugLoc(); |
| const TargetRegisterInfo &TRI = getRegisterInfo(); |
| |
| // When mthc1 is available, use: |
| // mtc1 Lo, $fp |
| // mthc1 Hi, $fp |
| // |
| // Otherwise, for O32 FPXX ABI: |
| // spill + reload via ldc1 |
| // This case is handled by the frame lowering code. |
| // |
| // Otherwise, for FP32: |
| // mtc1 Lo, $fp |
| // mtc1 Hi, $fp + 1 |
| // |
| // The case where dmtc1 is available doesn't need to be handled here |
| // because it never creates a BuildPairF64 node. |
| |
| // FPXX on MIPS-II or MIPS32r1 should have been handled with a spill/reload |
| // in MipsSEFrameLowering.cpp. |
| assert(!(Subtarget.isABI_FPXX() && !Subtarget.hasMips32r2())); |
| |
| // FP64A (FP64 with nooddspreg) should have been handled with a spill/reload |
| // in MipsSEFrameLowering.cpp. |
| assert(!(Subtarget.isFP64bit() && !Subtarget.useOddSPReg())); |
| |
| BuildMI(MBB, I, dl, Mtc1Tdd, TRI.getSubReg(DstReg, Mips::sub_lo)) |
| .addReg(LoReg); |
| |
| if (Subtarget.hasMTHC1()) { |
| // FIXME: The .addReg(DstReg) is a white lie used to temporarily work |
| // around a widespread bug in the -mfp64 support. |
| // The problem is that none of the 32-bit fpu ops mention the fact |
| // that they clobber the upper 32-bits of the 64-bit FPR. Fixing that |
| // requires a major overhaul of the FPU implementation which can't |
| // be done right now due to time constraints. |
| // MTHC1 is one of two instructions that are affected since they are |
| // the only instructions that don't read the lower 32-bits. |
| // We therefore pretend that it reads the bottom 32-bits to |
| // artificially create a dependency and prevent the scheduler |
| // changing the behaviour of the code. |
| BuildMI(MBB, I, dl, get(FP64 ? Mips::MTHC1_D64 : Mips::MTHC1_D32), DstReg) |
| .addReg(DstReg) |
| .addReg(HiReg); |
| } else if (Subtarget.isABI_FPXX()) |
| llvm_unreachable("BuildPairF64 not expanded in frame lowering code!"); |
| else |
| BuildMI(MBB, I, dl, Mtc1Tdd, TRI.getSubReg(DstReg, Mips::sub_hi)) |
| .addReg(HiReg); |
| } |
| |
| void MipsSEInstrInfo::expandEhReturn(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I) const { |
| // This pseudo instruction is generated as part of the lowering of |
| // ISD::EH_RETURN. We convert it to a stack increment by OffsetReg, and |
| // indirect jump to TargetReg |
| unsigned ADDU = Subtarget.isABI_N64() ? Mips::DADDu : Mips::ADDu; |
| unsigned SP = Subtarget.isGP64bit() ? Mips::SP_64 : Mips::SP; |
| unsigned RA = Subtarget.isGP64bit() ? Mips::RA_64 : Mips::RA; |
| unsigned T9 = Subtarget.isGP64bit() ? Mips::T9_64 : Mips::T9; |
| unsigned ZERO = Subtarget.isGP64bit() ? Mips::ZERO_64 : Mips::ZERO; |
| unsigned OffsetReg = I->getOperand(0).getReg(); |
| unsigned TargetReg = I->getOperand(1).getReg(); |
| |
| // addu $ra, $v0, $zero |
| // addu $sp, $sp, $v1 |
| // jr $ra (via RetRA) |
| const TargetMachine &TM = MBB.getParent()->getTarget(); |
| if (TM.getRelocationModel() == Reloc::PIC_) |
| BuildMI(MBB, I, I->getDebugLoc(), get(ADDU), T9) |
| .addReg(TargetReg) |
| .addReg(ZERO); |
| BuildMI(MBB, I, I->getDebugLoc(), get(ADDU), RA) |
| .addReg(TargetReg) |
| .addReg(ZERO); |
| BuildMI(MBB, I, I->getDebugLoc(), get(ADDU), SP).addReg(SP).addReg(OffsetReg); |
| expandRetRA(MBB, I); |
| } |
| |
| const MipsInstrInfo *llvm::createMipsSEInstrInfo(const MipsSubtarget &STI) { |
| return new MipsSEInstrInfo(STI); |
| } |
