diff options
Diffstat (limited to 'contrib/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp | 160 |
1 files changed, 113 insertions, 47 deletions
diff --git a/contrib/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp b/contrib/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp index 02931a3..69cb74c 100644 --- a/contrib/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp +++ b/contrib/llvm/lib/Target/Mips/MipsSEInstrInfo.cpp @@ -24,11 +24,10 @@ using namespace llvm; -MipsSEInstrInfo::MipsSEInstrInfo(MipsTargetMachine &tm) - : MipsInstrInfo(tm, - tm.getRelocationModel() == Reloc::PIC_ ? Mips::B : Mips::J), - RI(*tm.getSubtargetImpl()), - IsN64(tm.getSubtarget<MipsSubtarget>().isABI_N64()) {} +MipsSEInstrInfo::MipsSEInstrInfo(const MipsSubtarget &STI) + : MipsInstrInfo(STI, STI.getRelocationModel() == Reloc::PIC_ ? Mips::B + : Mips::J), + RI(STI), IsN64(STI.isABI_N64()) {} const MipsRegisterInfo &MipsSEInstrInfo::getRegisterInfo() const { return RI; @@ -84,19 +83,25 @@ void MipsSEInstrInfo::copyPhysReg(MachineBasicBlock &MBB, 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)) - Opc = Mips::ADDu, ZeroReg = Mips::ZERO; - else if (Mips::CCRRegClass.contains(SrcReg)) + 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 = Mips::MFHI, SrcReg = 0; - else if (Mips::LO32RegClass.contains(SrcReg)) - Opc = Mips::MFLO, SrcReg = 0; - else if (Mips::HI32DSPRegClass.contains(SrcReg)) + 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; @@ -259,18 +264,22 @@ loadRegFromStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 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, Mips::RET); + expandRetRA(MBB, MI); break; case Mips::PseudoMFHI: - expandPseudoMFHiLo(MBB, MI, Mips::MFHI); + Opc = isMicroMips ? Mips::MFHI16_MM : Mips::MFHI; + expandPseudoMFHiLo(MBB, MI, Opc); break; case Mips::PseudoMFLO: - expandPseudoMFHiLo(MBB, MI, Mips::MFLO); + Opc = isMicroMips ? Mips::MFLO16_MM : Mips::MFLO; + expandPseudoMFHiLo(MBB, MI, Opc); break; case Mips::PseudoMFHI64: expandPseudoMFHiLo(MBB, MI, Mips::MFHI64); @@ -350,7 +359,7 @@ unsigned MipsSEInstrInfo::getOppositeBranchOpc(unsigned Opc) const { void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const { - const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>(); + 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; @@ -358,7 +367,7 @@ void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount, 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, 0); + unsigned Reg = loadImmediate(Amount, MBB, I, DL, nullptr); BuildMI(MBB, I, DL, get(ADDu), SP).addReg(SP).addReg(Reg, RegState::Kill); } } @@ -370,7 +379,7 @@ MipsSEInstrInfo::loadImmediate(int64_t Imm, MachineBasicBlock &MBB, MachineBasicBlock::iterator II, DebugLoc DL, unsigned *NewImm) const { MipsAnalyzeImmediate AnalyzeImm; - const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>(); + 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; @@ -418,9 +427,12 @@ unsigned MipsSEInstrInfo::getAnalyzableBrOpc(unsigned Opc) const { } void MipsSEInstrInfo::expandRetRA(MachineBasicBlock &MBB, - MachineBasicBlock::iterator I, - unsigned Opc) const { - BuildMI(MBB, I, I->getDebugLoc(), get(Opc)).addReg(Mips::RA); + 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> @@ -481,7 +493,8 @@ void MipsSEInstrInfo::expandCvtFPInt(MachineBasicBlock &MBB, DebugLoc DL = I->getDebugLoc(); bool DstIsLarger, SrcIsLarger; - tie(DstIsLarger, SrcIsLarger) = compareOpndSize(CvtOpc, *MBB.getParent()); + std::tie(DstIsLarger, SrcIsLarger) = + compareOpndSize(CvtOpc, *MBB.getParent()); if (DstIsLarger) TmpReg = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo); @@ -505,9 +518,30 @@ void MipsSEInstrInfo::expandExtractElementF64(MachineBasicBlock &MBB, unsigned SubIdx = N ? Mips::sub_hi : Mips::sub_lo; unsigned SubReg = getRegisterInfo().getSubReg(SrcReg, SubIdx); - if (SubIdx == Mips::sub_hi && FP64) - BuildMI(MBB, I, dl, get(Mips::MFHC1), DstReg).addReg(SubReg); - else + // 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); } @@ -520,19 +554,49 @@ void MipsSEInstrInfo::expandBuildPairF64(MachineBasicBlock &MBB, DebugLoc dl = I->getDebugLoc(); const TargetRegisterInfo &TRI = getRegisterInfo(); - // For FP32 mode: - // mtc1 Lo, $fp - // mtc1 Hi, $fp + 1 - // For FP64 mode: + // 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 (FP64) - BuildMI(MBB, I, dl, get(Mips::MTHC1), TRI.getSubReg(DstReg, Mips::sub_hi)) - .addReg(HiReg); + 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); @@ -543,29 +607,31 @@ void MipsSEInstrInfo::expandEhReturn(MachineBasicBlock &MBB, // 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 - const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>(); - unsigned ADDU = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu; - unsigned JR = STI.isABI_N64() ? Mips::JR64 : Mips::JR; - unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP; - unsigned RA = STI.isABI_N64() ? Mips::RA_64 : Mips::RA; - unsigned T9 = STI.isABI_N64() ? Mips::T9_64 : Mips::T9; - unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO; + 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 + // jr $ra (via RetRA) + const TargetMachine &TM = MBB.getParent()->getTarget(); if (TM.getRelocationModel() == Reloc::PIC_) BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(ADDU), T9) - .addReg(TargetReg).addReg(ZERO); + .addReg(TargetReg) + .addReg(ZERO); BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(ADDU), RA) - .addReg(TargetReg).addReg(ZERO); + .addReg(TargetReg) + .addReg(ZERO); BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(ADDU), SP) - .addReg(SP).addReg(OffsetReg); - BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(JR)).addReg(RA); + .addReg(SP) + .addReg(OffsetReg); + expandRetRA(MBB, I); } -const MipsInstrInfo *llvm::createMipsSEInstrInfo(MipsTargetMachine &TM) { - return new MipsSEInstrInfo(TM); +const MipsInstrInfo *llvm::createMipsSEInstrInfo(const MipsSubtarget &STI) { + return new MipsSEInstrInfo(STI); } |
