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