SparcRegisterInfo.cpp revision 930e4d96e8718abcb56212676c35e6f7ea0ab605
1f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org//===- SparcRegisterInfo.cpp - SPARC Register Information -------*- C++ -*-===// 2f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// 3f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// The LLVM Compiler Infrastructure 4f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// 5f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// This file is distributed under the University of Illinois Open Source 6f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// License. See LICENSE.TXT for details. 7f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// 8f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org//===----------------------------------------------------------------------===// 9f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// 10f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// This file contains the SPARC implementation of the TargetRegisterInfo class. 11f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org// 12f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org//===----------------------------------------------------------------------===// 13f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 14f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "Sparc.h" 15f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "SparcRegisterInfo.h" 16f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "SparcSubtarget.h" 17f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/CodeGen/MachineInstrBuilder.h" 18f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/CodeGen/MachineFunction.h" 19f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/CodeGen/MachineFrameInfo.h" 20f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/CodeGen/MachineLocation.h" 21f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/Support/ErrorHandling.h" 22f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/Target/TargetInstrInfo.h" 23f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/Type.h" 24f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/ADT/BitVector.h" 25f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org#include "llvm/ADT/STLExtras.h" 26f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgusing namespace llvm; 27f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 28f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgSparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st, 29f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org const TargetInstrInfo &tii) 30f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org : SparcGenRegisterInfo(SP::ADJCALLSTACKDOWN, SP::ADJCALLSTACKUP), 31f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Subtarget(st), TII(tii) { 32f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 33f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 34f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgconst unsigned* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) 35f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org const { 36f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org static const unsigned CalleeSavedRegs[] = { 0 }; 37f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return CalleeSavedRegs; 38f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 39f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 40f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgBitVector SparcRegisterInfo::getReservedRegs(const MachineFunction &MF) const { 41f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BitVector Reserved(getNumRegs()); 42f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G2); 43f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G3); 44f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G4); 45f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::O6); 46f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::I6); 47f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::I7); 48f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G0); 49f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G5); 50f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G6); 51f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Reserved.set(SP::G7); 52f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return Reserved; 53f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 54f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 55f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 56f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgconst TargetRegisterClass* const* 57f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgSparcRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const { 58f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org static const TargetRegisterClass * const CalleeSavedRegClasses[] = { 0 }; 59f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return CalleeSavedRegClasses; 60f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 61f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 62f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgbool SparcRegisterInfo::hasFP(const MachineFunction &MF) const { 63f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return false; 64f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 65f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 66f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgvoid SparcRegisterInfo:: 67f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgeliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 68f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineBasicBlock::iterator I) const { 69f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineInstr &MI = *I; 70f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org DebugLoc dl = MI.getDebugLoc(); 71f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org int Size = MI.getOperand(0).getImm(); 72f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (MI.getOpcode() == SP::ADJCALLSTACKDOWN) 73f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org Size = -Size; 74f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (Size) 75f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(MBB, I, dl, TII.get(SP::ADDri), SP::O6).addReg(SP::O6).addImm(Size); 76f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MBB.erase(I); 77f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 78f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 79f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgvoid SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, 809862697206250265c6bb37a4186b0a411c78de3bhbono@chromium.org int SPAdj, RegScavenger *RS) const { 819862697206250265c6bb37a4186b0a411c78de3bhbono@chromium.org assert(SPAdj == 0 && "Unexpected"); 82f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 83f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org unsigned i = 0; 84f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineInstr &MI = *II; 85f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org DebugLoc dl = MI.getDebugLoc(); 86f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org while (!MI.getOperand(i).isFI()) { 87f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org ++i; 88f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!"); 89f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } 90f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 91f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org int FrameIndex = MI.getOperand(i).getIndex(); 92f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 93f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Addressable stack objects are accessed using neg. offsets from %fp 94f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineFunction &MF = *MI.getParent()->getParent(); 95f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) + 96f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MI.getOperand(i+1).getImm(); 97f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 98f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Replace frame index with a frame pointer reference. 99f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (Offset >= -4096 && Offset <= 4095) { 100f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // If the offset is small enough to fit in the immediate field, directly 101f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // encode it. 102f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MI.getOperand(i).ChangeToRegister(SP::I6, false); 103f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MI.getOperand(i+1).ChangeToImmediate(Offset); 104f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } else { 105f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to 106f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // scavenge a register here instead of reserving G1 all of the time. 107f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org unsigned OffHi = (unsigned)Offset >> 10U; 108f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi); 109f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Emit G1 = G1 + I6 110f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1) 111f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org .addReg(SP::I6); 112f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Insert: G1+%lo(offset) into the user. 113f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MI.getOperand(i).ChangeToRegister(SP::G1, false); 114f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MI.getOperand(i+1).ChangeToImmediate(Offset & ((1 << 10)-1)); 115f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } 116f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 117f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 118f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgvoid SparcRegisterInfo:: 119f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgprocessFunctionBeforeFrameFinalized(MachineFunction &MF) const {} 120f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 121f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgvoid SparcRegisterInfo::emitPrologue(MachineFunction &MF) const { 122f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineBasicBlock &MBB = MF.front(); 123f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineFrameInfo *MFI = MF.getFrameInfo(); 124f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineBasicBlock::iterator MBBI = MBB.begin(); 125f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org DebugLoc dl = (MBBI != MBB.end() ? 126f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MBBI->getDebugLoc() : DebugLoc::getUnknownLoc()); 127f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 128f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Get the number of bytes to allocate from the FrameInfo 129f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org int NumBytes = (int) MFI->getStackSize(); 130f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 131f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Emit the correct save instruction based on the number of bytes in 132f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // the frame. Minimum stack frame size according to V8 ABI is: 133f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // 16 words for register window spill 134f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // 1 word for address of returned aggregate-value 135f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // + 6 words for passing parameters on the stack 136f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // ---------- 137f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // 23 words * 4 bytes per word = 92 bytes 138f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org NumBytes += 92; 139f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 140f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Round up to next doubleword boundary -- a double-word boundary 141f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // is required by the ABI. 142f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org NumBytes = (NumBytes + 7) & ~7; 143f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org NumBytes = -NumBytes; 144f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 145f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org if (NumBytes >= -4096) { 146f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(MBB, MBBI, dl, TII.get(SP::SAVEri), SP::O6) 147f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org .addReg(SP::O6).addImm(NumBytes); 148f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } else { 149f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Emit this the hard way. This clobbers G1 which we always know is 150f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // available here. 151f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org unsigned OffHi = (unsigned)NumBytes >> 10U; 152f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(MBB, MBBI, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi); 153f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org // Emit G1 = G1 + I6 154f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(MBB, MBBI, dl, TII.get(SP::ORri), SP::G1) 155f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org .addReg(SP::G1).addImm(NumBytes & ((1 << 10)-1)); 156f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(MBB, MBBI, dl, TII.get(SP::SAVErr), SP::O6) 157f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org .addReg(SP::O6).addReg(SP::G1); 158f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org } 159f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 160f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 161f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgvoid SparcRegisterInfo::emitEpilogue(MachineFunction &MF, 162f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineBasicBlock &MBB) const { 163f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org MachineBasicBlock::iterator MBBI = prior(MBB.end()); 164f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org DebugLoc dl = MBBI->getDebugLoc(); 165f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org assert(MBBI->getOpcode() == SP::RETL && 166f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org "Can only put epilog before 'retl' instruction!"); 167f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org BuildMI(MBB, MBBI, dl, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0) 168f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org .addReg(SP::G0); 169f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 170f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 171f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgunsigned SparcRegisterInfo::getRARegister() const { 172f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return SP::I7; 173f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 174f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 175f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgunsigned SparcRegisterInfo::getFrameRegister(MachineFunction &MF) const { 176f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org return SP::I6; 177f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org} 178f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.org 179f0c4f33a4aa0760ba0e12a254b69d996442c9c5hbono@chromium.orgunsigned SparcRegisterInfo::getEHExceptionRegister() const { 180 llvm_unreachable("What is the exception register"); 181 return 0; 182} 183 184unsigned SparcRegisterInfo::getEHHandlerRegister() const { 185 llvm_unreachable("What is the exception handler register"); 186 return 0; 187} 188 189int SparcRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const { 190 return SparcGenRegisterInfo::getDwarfRegNumFull(RegNum, 0); 191} 192 193#include "SparcGenRegisterInfo.inc" 194 195