| //===-- SparcInstrInfo.cpp - Sparc Instruction Information ----------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains the Sparc implementation of the TargetInstrInfo class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "SparcInstrInfo.h" |
| #include "Sparc.h" |
| #include "SparcMachineFunctionInfo.h" |
| #include "SparcSubtarget.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineInstrBuilder.h" |
| #include "llvm/CodeGen/MachineMemOperand.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/TargetRegistry.h" |
| |
| using namespace llvm; |
| |
| #define GET_INSTRINFO_CTOR_DTOR |
| #include "SparcGenInstrInfo.inc" |
| |
| // Pin the vtable to this file. |
| void SparcInstrInfo::anchor() {} |
| |
| SparcInstrInfo::SparcInstrInfo(SparcSubtarget &ST) |
| : SparcGenInstrInfo(SP::ADJCALLSTACKDOWN, SP::ADJCALLSTACKUP), RI(), |
| Subtarget(ST) {} |
| |
| /// 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 SparcInstrInfo::isLoadFromStackSlot(const MachineInstr &MI, |
| int &FrameIndex) const { |
| if (MI.getOpcode() == SP::LDri || MI.getOpcode() == SP::LDXri || |
| MI.getOpcode() == SP::LDFri || MI.getOpcode() == SP::LDDFri || |
| MI.getOpcode() == SP::LDQFri) { |
| if (MI.getOperand(1).isFI() && MI.getOperand(2).isImm() && |
| MI.getOperand(2).getImm() == 0) { |
| 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 SparcInstrInfo::isStoreToStackSlot(const MachineInstr &MI, |
| int &FrameIndex) const { |
| if (MI.getOpcode() == SP::STri || MI.getOpcode() == SP::STXri || |
| MI.getOpcode() == SP::STFri || MI.getOpcode() == SP::STDFri || |
| MI.getOpcode() == SP::STQFri) { |
| if (MI.getOperand(0).isFI() && MI.getOperand(1).isImm() && |
| MI.getOperand(1).getImm() == 0) { |
| FrameIndex = MI.getOperand(0).getIndex(); |
| return MI.getOperand(2).getReg(); |
| } |
| } |
| return 0; |
| } |
| |
| static bool IsIntegerCC(unsigned CC) |
| { |
| return (CC <= SPCC::ICC_VC); |
| } |
| |
| static SPCC::CondCodes GetOppositeBranchCondition(SPCC::CondCodes CC) |
| { |
| switch(CC) { |
| case SPCC::ICC_A: return SPCC::ICC_N; |
| case SPCC::ICC_N: return SPCC::ICC_A; |
| case SPCC::ICC_NE: return SPCC::ICC_E; |
| case SPCC::ICC_E: return SPCC::ICC_NE; |
| case SPCC::ICC_G: return SPCC::ICC_LE; |
| case SPCC::ICC_LE: return SPCC::ICC_G; |
| case SPCC::ICC_GE: return SPCC::ICC_L; |
| case SPCC::ICC_L: return SPCC::ICC_GE; |
| case SPCC::ICC_GU: return SPCC::ICC_LEU; |
| case SPCC::ICC_LEU: return SPCC::ICC_GU; |
| case SPCC::ICC_CC: return SPCC::ICC_CS; |
| case SPCC::ICC_CS: return SPCC::ICC_CC; |
| case SPCC::ICC_POS: return SPCC::ICC_NEG; |
| case SPCC::ICC_NEG: return SPCC::ICC_POS; |
| case SPCC::ICC_VC: return SPCC::ICC_VS; |
| case SPCC::ICC_VS: return SPCC::ICC_VC; |
| |
| case SPCC::FCC_A: return SPCC::FCC_N; |
| case SPCC::FCC_N: return SPCC::FCC_A; |
| case SPCC::FCC_U: return SPCC::FCC_O; |
| case SPCC::FCC_O: return SPCC::FCC_U; |
| case SPCC::FCC_G: return SPCC::FCC_ULE; |
| case SPCC::FCC_LE: return SPCC::FCC_UG; |
| case SPCC::FCC_UG: return SPCC::FCC_LE; |
| case SPCC::FCC_ULE: return SPCC::FCC_G; |
| case SPCC::FCC_L: return SPCC::FCC_UGE; |
| case SPCC::FCC_GE: return SPCC::FCC_UL; |
| case SPCC::FCC_UL: return SPCC::FCC_GE; |
| case SPCC::FCC_UGE: return SPCC::FCC_L; |
| case SPCC::FCC_LG: return SPCC::FCC_UE; |
| case SPCC::FCC_UE: return SPCC::FCC_LG; |
| case SPCC::FCC_NE: return SPCC::FCC_E; |
| case SPCC::FCC_E: return SPCC::FCC_NE; |
| |
| case SPCC::CPCC_A: return SPCC::CPCC_N; |
| case SPCC::CPCC_N: return SPCC::CPCC_A; |
| case SPCC::CPCC_3: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_2: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_23: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_1: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_13: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_12: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_123: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_0: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_03: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_02: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_023: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_01: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_013: LLVM_FALLTHROUGH; |
| case SPCC::CPCC_012: |
| // "Opposite" code is not meaningful, as we don't know |
| // what the CoProc condition means here. The cond-code will |
| // only be used in inline assembler, so this code should |
| // not be reached in a normal compilation pass. |
| llvm_unreachable("Meaningless inversion of co-processor cond code"); |
| } |
| llvm_unreachable("Invalid cond code"); |
| } |
| |
| static bool isUncondBranchOpcode(int Opc) { return Opc == SP::BA; } |
| |
| static bool isCondBranchOpcode(int Opc) { |
| return Opc == SP::FBCOND || Opc == SP::BCOND; |
| } |
| |
| static bool isIndirectBranchOpcode(int Opc) { |
| return Opc == SP::BINDrr || Opc == SP::BINDri; |
| } |
| |
| static void parseCondBranch(MachineInstr *LastInst, MachineBasicBlock *&Target, |
| SmallVectorImpl<MachineOperand> &Cond) { |
| Cond.push_back(MachineOperand::CreateImm(LastInst->getOperand(1).getImm())); |
| Target = LastInst->getOperand(0).getMBB(); |
| } |
| |
| bool SparcInstrInfo::analyzeBranch(MachineBasicBlock &MBB, |
| MachineBasicBlock *&TBB, |
| MachineBasicBlock *&FBB, |
| SmallVectorImpl<MachineOperand> &Cond, |
| bool AllowModify) const { |
| MachineBasicBlock::iterator I = MBB.getLastNonDebugInstr(); |
| if (I == MBB.end()) |
| return false; |
| |
| if (!isUnpredicatedTerminator(*I)) |
| return false; |
| |
| // Get the last instruction in the block. |
| MachineInstr *LastInst = &*I; |
| unsigned LastOpc = LastInst->getOpcode(); |
| |
| // If there is only one terminator instruction, process it. |
| if (I == MBB.begin() || !isUnpredicatedTerminator(*--I)) { |
| if (isUncondBranchOpcode(LastOpc)) { |
| TBB = LastInst->getOperand(0).getMBB(); |
| return false; |
| } |
| if (isCondBranchOpcode(LastOpc)) { |
| // Block ends with fall-through condbranch. |
| parseCondBranch(LastInst, TBB, Cond); |
| return false; |
| } |
| return true; // Can't handle indirect branch. |
| } |
| |
| // Get the instruction before it if it is a terminator. |
| MachineInstr *SecondLastInst = &*I; |
| unsigned SecondLastOpc = SecondLastInst->getOpcode(); |
| |
| // If AllowModify is true and the block ends with two or more unconditional |
| // branches, delete all but the first unconditional branch. |
| if (AllowModify && isUncondBranchOpcode(LastOpc)) { |
| while (isUncondBranchOpcode(SecondLastOpc)) { |
| LastInst->eraseFromParent(); |
| LastInst = SecondLastInst; |
| LastOpc = LastInst->getOpcode(); |
| if (I == MBB.begin() || !isUnpredicatedTerminator(*--I)) { |
| // Return now the only terminator is an unconditional branch. |
| TBB = LastInst->getOperand(0).getMBB(); |
| return false; |
| } else { |
| SecondLastInst = &*I; |
| SecondLastOpc = SecondLastInst->getOpcode(); |
| } |
| } |
| } |
| |
| // If there are three terminators, we don't know what sort of block this is. |
| if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(*--I)) |
| return true; |
| |
| // If the block ends with a B and a Bcc, handle it. |
| if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) { |
| parseCondBranch(SecondLastInst, TBB, Cond); |
| FBB = LastInst->getOperand(0).getMBB(); |
| return false; |
| } |
| |
| // If the block ends with two unconditional branches, handle it. The second |
| // one is not executed. |
| if (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) { |
| TBB = SecondLastInst->getOperand(0).getMBB(); |
| return false; |
| } |
| |
| // ...likewise if it ends with an indirect branch followed by an unconditional |
| // branch. |
| if (isIndirectBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) { |
| I = LastInst; |
| if (AllowModify) |
| I->eraseFromParent(); |
| return true; |
| } |
| |
| // Otherwise, can't handle this. |
| return true; |
| } |
| |
| unsigned SparcInstrInfo::insertBranch(MachineBasicBlock &MBB, |
| MachineBasicBlock *TBB, |
| MachineBasicBlock *FBB, |
| ArrayRef<MachineOperand> Cond, |
| const DebugLoc &DL, |
| int *BytesAdded) const { |
| assert(TBB && "insertBranch must not be told to insert a fallthrough"); |
| assert((Cond.size() == 1 || Cond.size() == 0) && |
| "Sparc branch conditions should have one component!"); |
| assert(!BytesAdded && "code size not handled"); |
| |
| if (Cond.empty()) { |
| assert(!FBB && "Unconditional branch with multiple successors!"); |
| BuildMI(&MBB, DL, get(SP::BA)).addMBB(TBB); |
| return 1; |
| } |
| |
| // Conditional branch |
| unsigned CC = Cond[0].getImm(); |
| |
| if (IsIntegerCC(CC)) |
| BuildMI(&MBB, DL, get(SP::BCOND)).addMBB(TBB).addImm(CC); |
| else |
| BuildMI(&MBB, DL, get(SP::FBCOND)).addMBB(TBB).addImm(CC); |
| if (!FBB) |
| return 1; |
| |
| BuildMI(&MBB, DL, get(SP::BA)).addMBB(FBB); |
| return 2; |
| } |
| |
| unsigned SparcInstrInfo::removeBranch(MachineBasicBlock &MBB, |
| int *BytesRemoved) const { |
| assert(!BytesRemoved && "code size not handled"); |
| |
| MachineBasicBlock::iterator I = MBB.end(); |
| unsigned Count = 0; |
| while (I != MBB.begin()) { |
| --I; |
| |
| if (I->isDebugInstr()) |
| continue; |
| |
| if (I->getOpcode() != SP::BA |
| && I->getOpcode() != SP::BCOND |
| && I->getOpcode() != SP::FBCOND) |
| break; // Not a branch |
| |
| I->eraseFromParent(); |
| I = MBB.end(); |
| ++Count; |
| } |
| return Count; |
| } |
| |
| bool SparcInstrInfo::reverseBranchCondition( |
| SmallVectorImpl<MachineOperand> &Cond) const { |
| assert(Cond.size() == 1); |
| SPCC::CondCodes CC = static_cast<SPCC::CondCodes>(Cond[0].getImm()); |
| Cond[0].setImm(GetOppositeBranchCondition(CC)); |
| return false; |
| } |
| |
| void SparcInstrInfo::copyPhysReg(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I, |
| const DebugLoc &DL, unsigned DestReg, |
| unsigned SrcReg, bool KillSrc) const { |
| unsigned numSubRegs = 0; |
| unsigned movOpc = 0; |
| const unsigned *subRegIdx = nullptr; |
| bool ExtraG0 = false; |
| |
| const unsigned DW_SubRegsIdx[] = { SP::sub_even, SP::sub_odd }; |
| const unsigned DFP_FP_SubRegsIdx[] = { SP::sub_even, SP::sub_odd }; |
| const unsigned QFP_DFP_SubRegsIdx[] = { SP::sub_even64, SP::sub_odd64 }; |
| const unsigned QFP_FP_SubRegsIdx[] = { SP::sub_even, SP::sub_odd, |
| SP::sub_odd64_then_sub_even, |
| SP::sub_odd64_then_sub_odd }; |
| |
| if (SP::IntRegsRegClass.contains(DestReg, SrcReg)) |
| BuildMI(MBB, I, DL, get(SP::ORrr), DestReg).addReg(SP::G0) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| else if (SP::IntPairRegClass.contains(DestReg, SrcReg)) { |
| subRegIdx = DW_SubRegsIdx; |
| numSubRegs = 2; |
| movOpc = SP::ORrr; |
| ExtraG0 = true; |
| } else if (SP::FPRegsRegClass.contains(DestReg, SrcReg)) |
| BuildMI(MBB, I, DL, get(SP::FMOVS), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| else if (SP::DFPRegsRegClass.contains(DestReg, SrcReg)) { |
| if (Subtarget.isV9()) { |
| BuildMI(MBB, I, DL, get(SP::FMOVD), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| } else { |
| // Use two FMOVS instructions. |
| subRegIdx = DFP_FP_SubRegsIdx; |
| numSubRegs = 2; |
| movOpc = SP::FMOVS; |
| } |
| } else if (SP::QFPRegsRegClass.contains(DestReg, SrcReg)) { |
| if (Subtarget.isV9()) { |
| if (Subtarget.hasHardQuad()) { |
| BuildMI(MBB, I, DL, get(SP::FMOVQ), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| } else { |
| // Use two FMOVD instructions. |
| subRegIdx = QFP_DFP_SubRegsIdx; |
| numSubRegs = 2; |
| movOpc = SP::FMOVD; |
| } |
| } else { |
| // Use four FMOVS instructions. |
| subRegIdx = QFP_FP_SubRegsIdx; |
| numSubRegs = 4; |
| movOpc = SP::FMOVS; |
| } |
| } else if (SP::ASRRegsRegClass.contains(DestReg) && |
| SP::IntRegsRegClass.contains(SrcReg)) { |
| BuildMI(MBB, I, DL, get(SP::WRASRrr), DestReg) |
| .addReg(SP::G0) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| } else if (SP::IntRegsRegClass.contains(DestReg) && |
| SP::ASRRegsRegClass.contains(SrcReg)) { |
| BuildMI(MBB, I, DL, get(SP::RDASR), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| } else |
| llvm_unreachable("Impossible reg-to-reg copy"); |
| |
| if (numSubRegs == 0 || subRegIdx == nullptr || movOpc == 0) |
| return; |
| |
| const TargetRegisterInfo *TRI = &getRegisterInfo(); |
| MachineInstr *MovMI = nullptr; |
| |
| for (unsigned i = 0; i != numSubRegs; ++i) { |
| Register Dst = TRI->getSubReg(DestReg, subRegIdx[i]); |
| Register Src = TRI->getSubReg(SrcReg, subRegIdx[i]); |
| assert(Dst && Src && "Bad sub-register"); |
| |
| MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(movOpc), Dst); |
| if (ExtraG0) |
| MIB.addReg(SP::G0); |
| MIB.addReg(Src); |
| MovMI = MIB.getInstr(); |
| } |
| // Add implicit super-register defs and kills to the last MovMI. |
| MovMI->addRegisterDefined(DestReg, TRI); |
| if (KillSrc) |
| MovMI->addRegisterKilled(SrcReg, TRI); |
| } |
| |
| void SparcInstrInfo:: |
| storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| unsigned SrcReg, bool isKill, int FI, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const { |
| DebugLoc DL; |
| if (I != MBB.end()) DL = I->getDebugLoc(); |
| |
| MachineFunction *MF = MBB.getParent(); |
| const MachineFrameInfo &MFI = MF->getFrameInfo(); |
| MachineMemOperand *MMO = MF->getMachineMemOperand( |
| MachinePointerInfo::getFixedStack(*MF, FI), MachineMemOperand::MOStore, |
| MFI.getObjectSize(FI), MFI.getObjectAlignment(FI)); |
| |
| // On the order of operands here: think "[FrameIdx + 0] = SrcReg". |
| if (RC == &SP::I64RegsRegClass) |
| BuildMI(MBB, I, DL, get(SP::STXri)).addFrameIndex(FI).addImm(0) |
| .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO); |
| else if (RC == &SP::IntRegsRegClass) |
| BuildMI(MBB, I, DL, get(SP::STri)).addFrameIndex(FI).addImm(0) |
| .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO); |
| else if (RC == &SP::IntPairRegClass) |
| BuildMI(MBB, I, DL, get(SP::STDri)).addFrameIndex(FI).addImm(0) |
| .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO); |
| else if (RC == &SP::FPRegsRegClass) |
| BuildMI(MBB, I, DL, get(SP::STFri)).addFrameIndex(FI).addImm(0) |
| .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO); |
| else if (SP::DFPRegsRegClass.hasSubClassEq(RC)) |
| BuildMI(MBB, I, DL, get(SP::STDFri)).addFrameIndex(FI).addImm(0) |
| .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO); |
| else if (SP::QFPRegsRegClass.hasSubClassEq(RC)) |
| // Use STQFri irrespective of its legality. If STQ is not legal, it will be |
| // lowered into two STDs in eliminateFrameIndex. |
| BuildMI(MBB, I, DL, get(SP::STQFri)).addFrameIndex(FI).addImm(0) |
| .addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO); |
| else |
| llvm_unreachable("Can't store this register to stack slot"); |
| } |
| |
| void SparcInstrInfo:: |
| loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, |
| unsigned DestReg, int FI, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const { |
| DebugLoc DL; |
| if (I != MBB.end()) DL = I->getDebugLoc(); |
| |
| MachineFunction *MF = MBB.getParent(); |
| const MachineFrameInfo &MFI = MF->getFrameInfo(); |
| MachineMemOperand *MMO = MF->getMachineMemOperand( |
| MachinePointerInfo::getFixedStack(*MF, FI), MachineMemOperand::MOLoad, |
| MFI.getObjectSize(FI), MFI.getObjectAlignment(FI)); |
| |
| if (RC == &SP::I64RegsRegClass) |
| BuildMI(MBB, I, DL, get(SP::LDXri), DestReg).addFrameIndex(FI).addImm(0) |
| .addMemOperand(MMO); |
| else if (RC == &SP::IntRegsRegClass) |
| BuildMI(MBB, I, DL, get(SP::LDri), DestReg).addFrameIndex(FI).addImm(0) |
| .addMemOperand(MMO); |
| else if (RC == &SP::IntPairRegClass) |
| BuildMI(MBB, I, DL, get(SP::LDDri), DestReg).addFrameIndex(FI).addImm(0) |
| .addMemOperand(MMO); |
| else if (RC == &SP::FPRegsRegClass) |
| BuildMI(MBB, I, DL, get(SP::LDFri), DestReg).addFrameIndex(FI).addImm(0) |
| .addMemOperand(MMO); |
| else if (SP::DFPRegsRegClass.hasSubClassEq(RC)) |
| BuildMI(MBB, I, DL, get(SP::LDDFri), DestReg).addFrameIndex(FI).addImm(0) |
| .addMemOperand(MMO); |
| else if (SP::QFPRegsRegClass.hasSubClassEq(RC)) |
| // Use LDQFri irrespective of its legality. If LDQ is not legal, it will be |
| // lowered into two LDDs in eliminateFrameIndex. |
| BuildMI(MBB, I, DL, get(SP::LDQFri), DestReg).addFrameIndex(FI).addImm(0) |
| .addMemOperand(MMO); |
| else |
| llvm_unreachable("Can't load this register from stack slot"); |
| } |
| |
| unsigned SparcInstrInfo::getGlobalBaseReg(MachineFunction *MF) const |
| { |
| SparcMachineFunctionInfo *SparcFI = MF->getInfo<SparcMachineFunctionInfo>(); |
| unsigned GlobalBaseReg = SparcFI->getGlobalBaseReg(); |
| if (GlobalBaseReg != 0) |
| return GlobalBaseReg; |
| |
| // Insert the set of GlobalBaseReg into the first MBB of the function |
| MachineBasicBlock &FirstMBB = MF->front(); |
| MachineBasicBlock::iterator MBBI = FirstMBB.begin(); |
| MachineRegisterInfo &RegInfo = MF->getRegInfo(); |
| |
| const TargetRegisterClass *PtrRC = |
| Subtarget.is64Bit() ? &SP::I64RegsRegClass : &SP::IntRegsRegClass; |
| GlobalBaseReg = RegInfo.createVirtualRegister(PtrRC); |
| |
| DebugLoc dl; |
| |
| BuildMI(FirstMBB, MBBI, dl, get(SP::GETPCX), GlobalBaseReg); |
| SparcFI->setGlobalBaseReg(GlobalBaseReg); |
| return GlobalBaseReg; |
| } |
| |
| bool SparcInstrInfo::expandPostRAPseudo(MachineInstr &MI) const { |
| switch (MI.getOpcode()) { |
| case TargetOpcode::LOAD_STACK_GUARD: { |
| assert(Subtarget.isTargetLinux() && |
| "Only Linux target is expected to contain LOAD_STACK_GUARD"); |
| // offsetof(tcbhead_t, stack_guard) from sysdeps/sparc/nptl/tls.h in glibc. |
| const int64_t Offset = Subtarget.is64Bit() ? 0x28 : 0x14; |
| MI.setDesc(get(Subtarget.is64Bit() ? SP::LDXri : SP::LDri)); |
| MachineInstrBuilder(*MI.getParent()->getParent(), MI) |
| .addReg(SP::G7) |
| .addImm(Offset); |
| return true; |
| } |
| } |
| return false; |
| } |