ARMRegisterInfo.cpp revision b191e0ab51174cfb86502308f520f139daa9e4a0
17bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola//===- ARMRegisterInfo.cpp - ARM Register Information -----------*- C++ -*-===// 27bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// 37bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// The LLVM Compiler Infrastructure 47bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// 57bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// This file was developed by the "Instituto Nokia de Tecnologia" and 67bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// is distributed under the University of Illinois Open Source 77bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// License. See LICENSE.TXT for details. 87bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// 97bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola//===----------------------------------------------------------------------===// 107bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// 117bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// This file contains the ARM implementation of the MRegisterInfo class. 127bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola// 137bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola//===----------------------------------------------------------------------===// 147bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 157bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "ARM.h" 167bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "ARMRegisterInfo.h" 177bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "llvm/CodeGen/MachineInstrBuilder.h" 187bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "llvm/CodeGen/MachineFunction.h" 197bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "llvm/CodeGen/MachineFrameInfo.h" 207bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "llvm/CodeGen/MachineLocation.h" 217bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "llvm/Type.h" 22b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola#include "llvm/Target/TargetFrameInfo.h" 23b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola#include "llvm/Target/TargetMachine.h" 247ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola#include "llvm/Target/TargetOptions.h" 257bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "llvm/ADT/STLExtras.h" 267bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include <iostream> 277bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolausing namespace llvm; 287bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 297ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola// hasFP - Return true if the specified function should have a dedicated frame 307ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola// pointer register. This is true if the function has variable sized allocas or 317ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola// if frame pointer elimination is disabled. 327ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola// 337ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindolastatic bool hasFP(const MachineFunction &MF) { 347ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola const MachineFrameInfo *MFI = MF.getFrameInfo(); 357ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola return NoFramePointerElim || MFI->hasVarSizedObjects(); 367ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola} 377ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola 387bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolaARMRegisterInfo::ARMRegisterInfo() 397bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola : ARMGenRegisterInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP) { 407bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 417bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 427bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo:: 437bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolastoreRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 447bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola unsigned SrcReg, int FI, 457bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola const TargetRegisterClass *RC) const { 467bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola assert (RC == ARM::IntRegsRegisterClass); 477a53bd0890b0529c6dd95e97611dca7a8c4d6077Rafael Espindola BuildMI(MBB, I, ARM::str, 3).addReg(SrcReg).addImm(0).addFrameIndex(FI); 487bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 497bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 507bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo:: 517bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolaloadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 527bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola unsigned DestReg, int FI, 537bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola const TargetRegisterClass *RC) const { 547bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola assert (RC == ARM::IntRegsRegisterClass); 557a53bd0890b0529c6dd95e97611dca7a8c4d6077Rafael Espindola BuildMI(MBB, I, ARM::ldr, 2, DestReg).addImm(0).addFrameIndex(FI); 567bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 577bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 587bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo::copyRegToReg(MachineBasicBlock &MBB, 597bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola MachineBasicBlock::iterator I, 607bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola unsigned DestReg, unsigned SrcReg, 617bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola const TargetRegisterClass *RC) const { 62199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola assert(RC == ARM::IntRegsRegisterClass || 63199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola RC == ARM::FPRegsRegisterClass || 64199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola RC == ARM::DFPRegsRegisterClass); 65199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola 66199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola if (RC == ARM::IntRegsRegisterClass) 67199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola BuildMI(MBB, I, ARM::MOV, 3, DestReg).addReg(SrcReg).addImm(0) 68199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola .addImm(ARMShift::LSL); 69199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola else if (RC == ARM::FPRegsRegisterClass) 70199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola BuildMI(MBB, I, ARM::FCPYS, 1, DestReg).addReg(SrcReg); 71199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola else 72199dd67c50990a45876b871008cad0dad0f63b88Rafael Espindola BuildMI(MBB, I, ARM::FCPYD, 1, DestReg).addReg(SrcReg); 737bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 747bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 757bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolaMachineInstr *ARMRegisterInfo::foldMemoryOperand(MachineInstr* MI, 767bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola unsigned OpNum, 777bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola int FI) const { 787bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola return NULL; 797bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 807bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 810f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Chengconst unsigned* ARMRegisterInfo::getCalleeSaveRegs() const { 82ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola static const unsigned CalleeSaveRegs[] = { 83ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola ARM::R4, ARM::R5, ARM::R6, ARM::R7, 84ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola ARM::R8, ARM::R9, ARM::R10, ARM::R11, 85ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola ARM::R14, 0 86ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola }; 870f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Cheng return CalleeSaveRegs; 880f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Cheng} 890f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Cheng 900f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Chengconst TargetRegisterClass* const * 910f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan ChengARMRegisterInfo::getCalleeSaveRegClasses() const { 92ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola static const TargetRegisterClass * const CalleeSaveRegClasses[] = { 93ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola &ARM::IntRegsRegClass, &ARM::IntRegsRegClass, &ARM::IntRegsRegClass, &ARM::IntRegsRegClass, 94ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola &ARM::IntRegsRegClass, &ARM::IntRegsRegClass, &ARM::IntRegsRegClass, &ARM::IntRegsRegClass, 95ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola &ARM::IntRegsRegClass, 0 96ec46ea34dcc615558294e9e0dbd0dd0f2894f574Rafael Espindola }; 970f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Cheng return CalleeSaveRegClasses; 980f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Cheng} 990f3ac8d8d4ce23eb2ae6f9d850f389250874eea5Evan Cheng 1007bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo:: 1017bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolaeliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 1027bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola MachineBasicBlock::iterator I) const { 1037ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola if (hasFP(MF)) { 104b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola MachineInstr *Old = I; 105b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola unsigned Amount = Old->getOperand(0).getImmedValue(); 106b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola if (Amount != 0) { 107b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment(); 108b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola Amount = (Amount+Align-1)/Align*Align; 109b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola 110b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola if (Old->getOpcode() == ARM::ADJCALLSTACKDOWN) { 111b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola // sub sp, sp, amount 112b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola BuildMI(MBB, I, ARM::SUB, 2, ARM::R13).addReg(ARM::R13).addImm(Amount) 113b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola .addImm(0).addImm(ARMShift::LSL); 114b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola } else { 115b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola // add sp, sp, amount 116b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola assert(Old->getOpcode() == ARM::ADJCALLSTACKUP); 117b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola BuildMI(MBB, I, ARM::ADD, 2, ARM::R13).addReg(ARM::R13).addImm(Amount) 118b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola .addImm(0).addImm(ARMShift::LSL); 119b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola } 120b191e0ab51174cfb86502308f520f139daa9e4a0Rafael Espindola } 1217ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola } 1227bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola MBB.erase(I); 1237bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 1247bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 1257bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid 1267bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolaARMRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const { 12758421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola MachineInstr &MI = *II; 12858421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola MachineBasicBlock &MBB = *MI.getParent(); 12958421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola MachineFunction &MF = *MBB.getParent(); 13058421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 1317a53bd0890b0529c6dd95e97611dca7a8c4d6077Rafael Espindola assert (MI.getOpcode() == ARM::ldr || 132f3a335cedff423438789c593d58be068b124dc1eRafael Espindola MI.getOpcode() == ARM::str || 133f3a335cedff423438789c593d58be068b124dc1eRafael Espindola MI.getOpcode() == ARM::lea_addri); 13458421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 135a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola unsigned FrameIdx = 2; 136a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola unsigned OffIdx = 1; 13758421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 13858421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola int FrameIndex = MI.getOperand(FrameIdx).getFrameIndex(); 13958421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 1400d479ecbb132e324da27b674fea5b232115fe964Rafael Espindola int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) + 1410d479ecbb132e324da27b674fea5b232115fe964Rafael Espindola MI.getOperand(OffIdx).getImmedValue(); 14258421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 14358421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola unsigned StackSize = MF.getFrameInfo()->getStackSize(); 14458421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 14558421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola Offset += StackSize; 14658421d7d0847bbb5f4cc95c647726d55c45582c0Rafael Espindola 147a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola assert (Offset >= 0); 1487ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola unsigned BaseRegister = hasFP(MF) ? ARM::R11 : ARM::R13; 149a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola if (Offset < 4096) { 150a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola // Replace the FrameIndex with r13 1517ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola MI.getOperand(FrameIdx).ChangeToRegister(BaseRegister, false); 152a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola // Replace the ldr offset with Offset 153a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola MI.getOperand(OffIdx).ChangeToImmediate(Offset); 154a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola } else { 155a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola // Insert a set of r12 with the full address 156a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola // r12 = r13 + offset 157a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola MachineBasicBlock *MBB2 = MI.getParent(); 1587ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola BuildMI(*MBB2, II, ARM::ADD, 4, ARM::R12).addReg(BaseRegister) 1597ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola .addImm(Offset).addImm(0).addImm(ARMShift::LSL); 160a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola 161a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola // Replace the FrameIndex with r12 16209e460662a8d7328da1b938d5581a6ef3740b51dChris Lattner MI.getOperand(FrameIdx).ChangeToRegister(ARM::R12, false); 163a4e64359aafaf23e440e9dc171859daef1995f1bRafael Espindola } 1647bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 1657bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 1667bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo:: 1677bc59bc3952ad7842b1e079753deb32217a768a3Rafael EspindolaprocessFunctionBeforeFrameFinalized(MachineFunction &MF) const {} 1687bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 1697bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo::emitPrologue(MachineFunction &MF) const { 170355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola MachineBasicBlock &MBB = MF.front(); 17144819cb20ab8e84fc14ea1e6fc69fb797c70a50dRafael Espindola MachineBasicBlock::iterator MBBI = MBB.begin(); 172355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola MachineFrameInfo *MFI = MF.getFrameInfo(); 173355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola int NumBytes = (int) MFI->getStackSize(); 174355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola 1757ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola bool HasFP = hasFP(MF); 1767ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola 1771a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola if (MFI->hasCalls()) { 1781a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola // We reserve argument space for call sites in the function immediately on 1791a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola // entry to the current function. This eliminates the need for add/sub 1801a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola // brackets around call sites. 1811a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola NumBytes += MFI->getMaxCallFrameSize(); 1821a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola } 1831a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola 1847ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola if (HasFP) 1857ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola // Add space for storing the FP 1867ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola NumBytes += 4; 1877ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola 1881b5076887e32f9a16a1f65f3ce9abf11c31abcd7Rafael Espindola // Align to 8 bytes 1891b5076887e32f9a16a1f65f3ce9abf11c31abcd7Rafael Espindola NumBytes = ((NumBytes + 7) / 8) * 8; 1901b5076887e32f9a16a1f65f3ce9abf11c31abcd7Rafael Espindola 1911a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola MFI->setStackSize(NumBytes); 1921a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola 1931a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola //sub sp, sp, #NumBytes 1943ad5e5cf998841681e9d11e08eb82a94ddffd1f8Rafael Espindola BuildMI(MBB, MBBI, ARM::SUB, 4, ARM::R13).addReg(ARM::R13).addImm(NumBytes) 1953ad5e5cf998841681e9d11e08eb82a94ddffd1f8Rafael Espindola .addImm(0).addImm(ARMShift::LSL); 1967ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola 1977ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola if (HasFP) { 1987ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola BuildMI(MBB, MBBI, ARM::str, 3) 1997ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola .addReg(ARM::R11).addImm(0).addReg(ARM::R13); 2007ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola BuildMI(MBB, MBBI, ARM::MOV, 3, ARM::R11).addReg(ARM::R13).addImm(0). 2017ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola addImm(ARMShift::LSL); 2027ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola } 2037bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 2047bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 2057bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolavoid ARMRegisterInfo::emitEpilogue(MachineFunction &MF, 2067bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola MachineBasicBlock &MBB) const { 207355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola MachineBasicBlock::iterator MBBI = prior(MBB.end()); 208355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola assert(MBBI->getOpcode() == ARM::bx && 209355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola "Can only insert epilog into returning blocks"); 210355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola 211355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola MachineFrameInfo *MFI = MF.getFrameInfo(); 212355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola int NumBytes = (int) MFI->getStackSize(); 213355746359ebca83ccb5accab0f3ffd20f0374a35Rafael Espindola 2147ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola if (hasFP(MF)) { 2157ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola BuildMI(MBB, MBBI, ARM::MOV, 3, ARM::R13).addReg(ARM::R11).addImm(0). 2167ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola addImm(ARMShift::LSL); 2177ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola BuildMI(MBB, MBBI, ARM::ldr, 2, ARM::R11).addImm(0).addReg(ARM::R13); 2187ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola } 2197ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola 2201a009468175a6e123cc3f1e847c10e3e126a44dbRafael Espindola //add sp, sp, #NumBytes 2213ad5e5cf998841681e9d11e08eb82a94ddffd1f8Rafael Espindola BuildMI(MBB, MBBI, ARM::ADD, 4, ARM::R13).addReg(ARM::R13).addImm(NumBytes) 2223ad5e5cf998841681e9d11e08eb82a94ddffd1f8Rafael Espindola .addImm(0).addImm(ARMShift::LSL); 2237bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 2247bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 2257bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolaunsigned ARMRegisterInfo::getRARegister() const { 2267bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola return ARM::R14; 2277bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 2287bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 2297bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindolaunsigned ARMRegisterInfo::getFrameRegister(MachineFunction &MF) const { 2307ae68ab3bccb6ef2d0e4c489f0648dc5d37ae362Rafael Espindola return hasFP(MF) ? ARM::R11 : ARM::R13; 2317bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola} 2327bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 2337bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola#include "ARMGenRegisterInfo.inc" 2347bc59bc3952ad7842b1e079753deb32217a768a3Rafael Espindola 235