lib/Target/ARM/Thumb1InstrInfo.cpp

   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 "Thumb1InstrInfo.h"
  15 #include "ARM.h"
  16 #include "ARMMachineFunctionInfo.h"
  17 #include "llvm/CodeGen/MachineFrameInfo.h"
  18 #include "llvm/CodeGen/MachineInstrBuilder.h"
  19 #include "llvm/CodeGen/MachineRegisterInfo.h"
  20 #include "llvm/CodeGen/MachineMemOperand.h"
  21 #include "llvm/ADT/SmallVector.h"
  22 #include "llvm/MC/MCInst.h"
  23
  24 using namespace llvm;
  25
  26 Thumb1InstrInfo::Thumb1InstrInfo(const ARMSubtarget &STI)
  27   : ARMBaseInstrInfo(STI), RI(*this, STI) {
  28 }
  29
  30 /// getNoopForMachoTarget - Return the noop instruction to use for a noop.
  31 void Thumb1InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
  32   NopInst.setOpcode(ARM::tMOVr);
  33   NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
  34   NopInst.addOperand(MCOperand::CreateReg(ARM::R8));
  35   NopInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
  36   NopInst.addOperand(MCOperand::CreateReg(0));
  37 }
  38
  39 unsigned Thumb1InstrInfo::getUnindexedOpcode(unsigned Opc) const {
  40   return 0;
  41 }
  42
  43 void Thumb1InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
  44                                   MachineBasicBlock::iterator I, DebugLoc DL,
  45                                   unsigned DestReg, unsigned SrcReg,
  46                                   bool KillSrc) const {
  47   AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg)
  48     .addReg(SrcReg, getKillRegState(KillSrc)));
  49   assert(ARM::GPRRegClass.contains(DestReg, SrcReg) &&
  50          "Thumb1 can only copy GPR registers");
  51 }
  52
  53 void Thumb1InstrInfo::
  54 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
  55                     unsigned SrcReg, bool isKill, int FI,
  56                     const TargetRegisterClass *RC,
  57                     const TargetRegisterInfo *TRI) const {
  58   assert((RC == ARM::tGPRRegisterClass ||
  59           (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
  60            isARMLowRegister(SrcReg))) && "Unknown regclass!");
  61
  62   if (RC == ARM::tGPRRegisterClass ||
  63       (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
  64        isARMLowRegister(SrcReg))) {
  65     DebugLoc DL;
  66     if (I != MBB.end()) DL = I->getDebugLoc();
  67
  68     MachineFunction &MF = *MBB.getParent();
  69     MachineFrameInfo &MFI = *MF.getFrameInfo();
  70     MachineMemOperand *MMO =
  71       MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
  72                               MachineMemOperand::MOStore,
  73                               MFI.getObjectSize(FI),
  74                               MFI.getObjectAlignment(FI));
  75     AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tSTRspi))
  76                    .addReg(SrcReg, getKillRegState(isKill))
  77                    .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
  78   }
  79 }
  80
  81 void Thumb1InstrInfo::
  82 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
  83                      unsigned DestReg, int FI,
  84                      const TargetRegisterClass *RC,
  85                      const TargetRegisterInfo *TRI) const {
  86   assert((RC == ARM::tGPRRegisterClass ||
  87           (TargetRegisterInfo::isPhysicalRegister(DestReg) &&
  88            isARMLowRegister(DestReg))) && "Unknown regclass!");
  89
  90   if (RC == ARM::tGPRRegisterClass ||
  91       (TargetRegisterInfo::isPhysicalRegister(DestReg) &&
  92        isARMLowRegister(DestReg))) {
  93     DebugLoc DL;
  94     if (I != MBB.end()) DL = I->getDebugLoc();
  95
  96     MachineFunction &MF = *MBB.getParent();
  97     MachineFrameInfo &MFI = *MF.getFrameInfo();
  98     MachineMemOperand *MMO =
  99       MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
 100                               MachineMemOperand::MOLoad,
 101                               MFI.getObjectSize(FI),
 102                               MFI.getObjectAlignment(FI));
 103     AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::tLDRspi), DestReg)
 104                    .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
 105   }
 106 }