1 //===-- Thumb1InstrInfo.cpp - Thumb-1 Instruction Information -------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the Thumb-1 implementation of the TargetInstrInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "ARMSubtarget.h" 15 #include "Thumb1InstrInfo.h" 16 #include "llvm/CodeGen/MachineFrameInfo.h" 17 #include "llvm/CodeGen/MachineInstrBuilder.h" 18 #include "llvm/CodeGen/MachineMemOperand.h" 19 #include "llvm/CodeGen/MachineRegisterInfo.h" 20 #include "llvm/MC/MCInst.h" 21 22 using namespace llvm; 23 24 Thumb1InstrInfo::Thumb1InstrInfo(const ARMSubtarget &STI) 25 : ARMBaseInstrInfo(STI), RI() {} 26 27 /// getNoopForMachoTarget - Return the noop instruction to use for a noop. 28 void Thumb1InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const { 29 NopInst.setOpcode(ARM::tMOVr); 30 NopInst.addOperand(MCOperand::createReg(ARM::R8)); 31 NopInst.addOperand(MCOperand::createReg(ARM::R8)); 32 NopInst.addOperand(MCOperand::createImm(ARMCC::AL)); 33 NopInst.addOperand(MCOperand::createReg(0)); 34 } 35 36 unsigned Thumb1InstrInfo::getUnindexedOpcode(unsigned Opc) const { 37 return 0; 38 } 39 40 void Thumb1InstrInfo::copyPhysReg(MachineBasicBlock &MBB, 41 MachineBasicBlock::iterator I, DebugLoc DL, 42 unsigned DestReg, unsigned SrcReg, 43 bool KillSrc) const { 44 // Need to check the arch. 45 MachineFunction &MF = *MBB.getParent(); 46 const ARMSubtarget &st = MF.getSubtarget<ARMSubtarget>(); 47 48 assert(ARM::GPRRegClass.contains(DestReg, SrcReg) && 49 "Thumb1 can only copy GPR registers"); 50 51 if (st.hasV6Ops() || ARM::hGPRRegClass.contains(SrcReg) 52 || !ARM::tGPRRegClass.contains(DestReg)) 53 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg) 54 .addReg(SrcReg, getKillRegState(KillSrc))); 55 else { 56 // FIXME: The performance consequences of this are going to be atrocious. 57 // Some things to try that should be better: 58 // * 'mov hi, $src; mov $dst, hi', with hi as either r10 or r11 59 // * 'movs $dst, $src' if cpsr isn't live 60 // See: http://lists.llvm.org/pipermail/llvm-dev/2014-August/075998.html 61 62 // 'MOV lo, lo' is unpredictable on < v6, so use the stack to do it 63 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tPUSH))) 64 .addReg(SrcReg, getKillRegState(KillSrc)); 65 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tPOP))) 66 .addReg(DestReg, getDefRegState(true)); 67 } 68 } 69 70 void Thumb1InstrInfo:: 71 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 72 unsigned SrcReg, bool isKill, int FI, 73 const TargetRegisterClass *RC, 74 const TargetRegisterInfo *TRI) const { 75 assert((RC == &ARM::tGPRRegClass || 76 (TargetRegisterInfo::isPhysicalRegister(SrcReg) && 77 isARMLowRegister(SrcReg))) && "Unknown regclass!"); 78 79 if (RC == &ARM::tGPRRegClass || 80 (TargetRegisterInfo::isPhysicalRegister(SrcReg) && 81 isARMLowRegister(SrcReg))) { 82 DebugLoc DL; 83 if (I != MBB.end()) DL = I->getDebugLoc(); 84 85 MachineFunction &MF = *MBB.getParent(); 86 MachineFrameInfo &MFI = *MF.getFrameInfo(); 87 MachineMemOperand *MMO = MF.getMachineMemOperand( 88 MachinePointerInfo::getFixedStack(MF, FI), MachineMemOperand::MOStore, 89 MFI.getObjectSize(FI), MFI.getObjectAlignment(FI)); 90 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSTRspi)) 91 .addReg(SrcReg, getKillRegState(isKill)) 92 .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); 93 } 94 } 95 96 void Thumb1InstrInfo:: 97 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 98 unsigned DestReg, int FI, 99 const TargetRegisterClass *RC, 100 const TargetRegisterInfo *TRI) const { 101 assert((RC == &ARM::tGPRRegClass || 102 (TargetRegisterInfo::isPhysicalRegister(DestReg) && 103 isARMLowRegister(DestReg))) && "Unknown regclass!"); 104 105 if (RC == &ARM::tGPRRegClass || 106 (TargetRegisterInfo::isPhysicalRegister(DestReg) && 107 isARMLowRegister(DestReg))) { 108 DebugLoc DL; 109 if (I != MBB.end()) DL = I->getDebugLoc(); 110 111 MachineFunction &MF = *MBB.getParent(); 112 MachineFrameInfo &MFI = *MF.getFrameInfo(); 113 MachineMemOperand *MMO = MF.getMachineMemOperand( 114 MachinePointerInfo::getFixedStack(MF, FI), MachineMemOperand::MOLoad, 115 MFI.getObjectSize(FI), MFI.getObjectAlignment(FI)); 116 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tLDRspi), DestReg) 117 .addFrameIndex(FI).addImm(0).addMemOperand(MMO)); 118 } 119 } 120 121 void 122 Thumb1InstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI, 123 Reloc::Model RM) const { 124 if (RM == Reloc::PIC_) 125 expandLoadStackGuardBase(MI, ARM::tLDRLIT_ga_pcrel, ARM::tLDRi, RM); 126 else 127 expandLoadStackGuardBase(MI, ARM::tLDRLIT_ga_abs, ARM::tLDRi, RM); 128 } 129
