MipsRegisterInfo.cpp revision f99998a2b0a6c186b3a1b6ad7bfa488009a0c5f5
1//===-- MipsRegisterInfo.cpp - MIPS Register 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 MIPS implementation of the TargetRegisterInfo class. 11// 12//===----------------------------------------------------------------------===// 13 14#define DEBUG_TYPE "mips-reg-info" 15 16#include "MipsRegisterInfo.h" 17#include "Mips.h" 18#include "MipsAnalyzeImmediate.h" 19#include "MipsInstrInfo.h" 20#include "MipsSubtarget.h" 21#include "MipsMachineFunction.h" 22#include "llvm/Constants.h" 23#include "llvm/DebugInfo.h" 24#include "llvm/Type.h" 25#include "llvm/CodeGen/ValueTypes.h" 26#include "llvm/CodeGen/MachineInstrBuilder.h" 27#include "llvm/CodeGen/MachineFunction.h" 28#include "llvm/CodeGen/MachineFrameInfo.h" 29#include "llvm/Target/TargetFrameLowering.h" 30#include "llvm/Target/TargetMachine.h" 31#include "llvm/Target/TargetOptions.h" 32#include "llvm/Target/TargetInstrInfo.h" 33#include "llvm/Support/CommandLine.h" 34#include "llvm/Support/Debug.h" 35#include "llvm/Support/ErrorHandling.h" 36#include "llvm/Support/raw_ostream.h" 37#include "llvm/ADT/BitVector.h" 38#include "llvm/ADT/STLExtras.h" 39 40#define GET_REGINFO_TARGET_DESC 41#include "MipsGenRegisterInfo.inc" 42 43using namespace llvm; 44 45MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST) 46 : MipsGenRegisterInfo(Mips::RA), Subtarget(ST) {} 47 48unsigned MipsRegisterInfo::getPICCallReg() { return Mips::T9; } 49 50//===----------------------------------------------------------------------===// 51// Callee Saved Registers methods 52//===----------------------------------------------------------------------===// 53 54/// Mips Callee Saved Registers 55const uint16_t* MipsRegisterInfo:: 56getCalleeSavedRegs(const MachineFunction *MF) const { 57 if (Subtarget.isSingleFloat()) 58 return CSR_SingleFloatOnly_SaveList; 59 else if (!Subtarget.hasMips64()) 60 return CSR_O32_SaveList; 61 else if (Subtarget.isABI_N32()) 62 return CSR_N32_SaveList; 63 64 assert(Subtarget.isABI_N64()); 65 return CSR_N64_SaveList; 66} 67 68const uint32_t* 69MipsRegisterInfo::getCallPreservedMask(CallingConv::ID) const { 70 if (Subtarget.isSingleFloat()) 71 return CSR_SingleFloatOnly_RegMask; 72 else if (!Subtarget.hasMips64()) 73 return CSR_O32_RegMask; 74 else if (Subtarget.isABI_N32()) 75 return CSR_N32_RegMask; 76 77 assert(Subtarget.isABI_N64()); 78 return CSR_N64_RegMask; 79} 80 81BitVector MipsRegisterInfo:: 82getReservedRegs(const MachineFunction &MF) const { 83 static const uint16_t ReservedCPURegs[] = { 84 Mips::ZERO, Mips::AT, Mips::K0, Mips::K1, Mips::SP 85 }; 86 87 static const uint16_t ReservedCPU64Regs[] = { 88 Mips::ZERO_64, Mips::AT_64, Mips::K0_64, Mips::K1_64, Mips::SP_64 89 }; 90 91 BitVector Reserved(getNumRegs()); 92 typedef TargetRegisterClass::const_iterator RegIter; 93 94 for (unsigned I = 0; I < array_lengthof(ReservedCPURegs); ++I) 95 Reserved.set(ReservedCPURegs[I]); 96 97 if (Subtarget.hasMips64()) { 98 for (unsigned I = 0; I < array_lengthof(ReservedCPU64Regs); ++I) 99 Reserved.set(ReservedCPU64Regs[I]); 100 101 // Reserve all registers in AFGR64. 102 for (RegIter Reg = Mips::AFGR64RegClass.begin(), 103 EReg = Mips::AFGR64RegClass.end(); Reg != EReg; ++Reg) 104 Reserved.set(*Reg); 105 } else { 106 // Reserve all registers in CPU64Regs & FGR64. 107 for (RegIter Reg = Mips::CPU64RegsRegClass.begin(), 108 EReg = Mips::CPU64RegsRegClass.end(); Reg != EReg; ++Reg) 109 Reserved.set(*Reg); 110 111 for (RegIter Reg = Mips::FGR64RegClass.begin(), 112 EReg = Mips::FGR64RegClass.end(); Reg != EReg; ++Reg) 113 Reserved.set(*Reg); 114 } 115 // Reserve FP if this function should have a dedicated frame pointer register. 116 if (MF.getTarget().getFrameLowering()->hasFP(MF)) { 117 if (Subtarget.inMips16Mode()) 118 Reserved.set(Mips::S0); 119 else { 120 Reserved.set(Mips::FP); 121 Reserved.set(Mips::FP_64); 122 } 123 } 124 125 // Reserve hardware registers. 126 Reserved.set(Mips::HWR29); 127 Reserved.set(Mips::HWR29_64); 128 129 // Reserve DSP control register. 130 Reserved.set(Mips::DSPCtrl); 131 132 // Reserve RA if in mips16 mode. 133 if (Subtarget.inMips16Mode()) { 134 Reserved.set(Mips::RA); 135 Reserved.set(Mips::RA_64); 136 } 137 138 // Reserve GP if small section is used. 139 if (Subtarget.useSmallSection()) { 140 Reserved.set(Mips::GP); 141 Reserved.set(Mips::GP_64); 142 } 143 144 return Reserved; 145} 146 147bool 148MipsRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const { 149 return true; 150} 151 152bool 153MipsRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const { 154 return true; 155} 156 157// FrameIndex represent objects inside a abstract stack. 158// We must replace FrameIndex with an stack/frame pointer 159// direct reference. 160void MipsRegisterInfo:: 161eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, 162 RegScavenger *RS) const { 163 MachineInstr &MI = *II; 164 MachineFunction &MF = *MI.getParent()->getParent(); 165 166 unsigned i = 0; 167 while (!MI.getOperand(i).isFI()) { 168 ++i; 169 assert(i < MI.getNumOperands() && 170 "Instr doesn't have FrameIndex operand!"); 171 } 172 173 DEBUG(errs() << "\nFunction : " << MF.getName() << "\n"; 174 errs() << "<--------->\n" << MI); 175 176 int FrameIndex = MI.getOperand(i).getIndex(); 177 uint64_t stackSize = MF.getFrameInfo()->getStackSize(); 178 int64_t spOffset = MF.getFrameInfo()->getObjectOffset(FrameIndex); 179 180 DEBUG(errs() << "FrameIndex : " << FrameIndex << "\n" 181 << "spOffset : " << spOffset << "\n" 182 << "stackSize : " << stackSize << "\n"); 183 184 eliminateFI(MI, i, FrameIndex, stackSize, spOffset); 185} 186 187unsigned MipsRegisterInfo:: 188getFrameRegister(const MachineFunction &MF) const { 189 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); 190 bool IsN64 = Subtarget.isABI_N64(); 191 192 if (Subtarget.inMips16Mode()) 193 return TFI->hasFP(MF) ? Mips::S0 : Mips::SP; 194 else 195 return TFI->hasFP(MF) ? (IsN64 ? Mips::FP_64 : Mips::FP) : 196 (IsN64 ? Mips::SP_64 : Mips::SP); 197 198} 199 200unsigned MipsRegisterInfo:: 201getEHExceptionRegister() const { 202 llvm_unreachable("What is the exception register"); 203} 204 205unsigned MipsRegisterInfo:: 206getEHHandlerRegister() const { 207 llvm_unreachable("What is the exception handler register"); 208} 209