1 //===-- MipsRegisterInfo.cpp - MIPS Register 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 MIPS implementation of the TargetRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "mips-reg-info"
16 #include "MipsRegisterInfo.h"
18 #include "MipsAnalyzeImmediate.h"
19 #include "MipsInstrInfo.h"
20 #include "MipsMachineFunction.h"
21 #include "MipsSubtarget.h"
22 #include "llvm/ADT/BitVector.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/CodeGen/MachineFrameInfo.h"
25 #include "llvm/CodeGen/MachineFunction.h"
26 #include "llvm/CodeGen/MachineInstrBuilder.h"
27 #include "llvm/CodeGen/ValueTypes.h"
28 #include "llvm/DebugInfo.h"
29 #include "llvm/IR/Constants.h"
30 #include "llvm/IR/Type.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/Debug.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/raw_ostream.h"
35 #include "llvm/Target/TargetFrameLowering.h"
36 #include "llvm/Target/TargetInstrInfo.h"
37 #include "llvm/Target/TargetMachine.h"
38 #include "llvm/Target/TargetOptions.h"
40 #define GET_REGINFO_TARGET_DESC
41 #include "MipsGenRegisterInfo.inc"
45 MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST)
46 : MipsGenRegisterInfo(Mips::RA), Subtarget(ST) {}
48 unsigned MipsRegisterInfo::getPICCallReg() { return Mips::T9; }
52 MipsRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
53 MachineFunction &MF) const {
54 switch (RC->getID()) {
57 case Mips::CPURegsRegClassID:
58 case Mips::CPU64RegsRegClassID:
59 case Mips::DSPRegsRegClassID: {
60 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
61 return 28 - TFI->hasFP(MF);
63 case Mips::FGR32RegClassID:
65 case Mips::AFGR64RegClassID:
67 case Mips::FGR64RegClassID:
72 //===----------------------------------------------------------------------===//
73 // Callee Saved Registers methods
74 //===----------------------------------------------------------------------===//
76 /// Mips Callee Saved Registers
77 const uint16_t* MipsRegisterInfo::
78 getCalleeSavedRegs(const MachineFunction *MF) const {
79 if (Subtarget.isSingleFloat())
80 return CSR_SingleFloatOnly_SaveList;
81 else if (!Subtarget.hasMips64())
82 return CSR_O32_SaveList;
83 else if (Subtarget.isABI_N32())
84 return CSR_N32_SaveList;
86 assert(Subtarget.isABI_N64());
87 return CSR_N64_SaveList;
91 MipsRegisterInfo::getCallPreservedMask(CallingConv::ID) const {
92 if (Subtarget.isSingleFloat())
93 return CSR_SingleFloatOnly_RegMask;
94 else if (!Subtarget.hasMips64())
95 return CSR_O32_RegMask;
96 else if (Subtarget.isABI_N32())
97 return CSR_N32_RegMask;
99 assert(Subtarget.isABI_N64());
100 return CSR_N64_RegMask;
103 BitVector MipsRegisterInfo::
104 getReservedRegs(const MachineFunction &MF) const {
105 static const uint16_t ReservedCPURegs[] = {
106 Mips::ZERO, Mips::K0, Mips::K1, Mips::SP
109 static const uint16_t ReservedCPU64Regs[] = {
110 Mips::ZERO_64, Mips::K0_64, Mips::K1_64, Mips::SP_64
113 BitVector Reserved(getNumRegs());
114 typedef TargetRegisterClass::const_iterator RegIter;
116 for (unsigned I = 0; I < array_lengthof(ReservedCPURegs); ++I)
117 Reserved.set(ReservedCPURegs[I]);
119 for (unsigned I = 0; I < array_lengthof(ReservedCPU64Regs); ++I)
120 Reserved.set(ReservedCPU64Regs[I]);
122 if (Subtarget.hasMips64()) {
123 // Reserve all registers in AFGR64.
124 for (RegIter Reg = Mips::AFGR64RegClass.begin(),
125 EReg = Mips::AFGR64RegClass.end(); Reg != EReg; ++Reg)
128 // Reserve all registers in FGR64.
129 for (RegIter Reg = Mips::FGR64RegClass.begin(),
130 EReg = Mips::FGR64RegClass.end(); Reg != EReg; ++Reg)
133 // Reserve FP if this function should have a dedicated frame pointer register.
134 if (MF.getTarget().getFrameLowering()->hasFP(MF)) {
135 if (Subtarget.inMips16Mode())
136 Reserved.set(Mips::S0);
138 Reserved.set(Mips::FP);
139 Reserved.set(Mips::FP_64);
143 // Reserve hardware registers.
144 Reserved.set(Mips::HWR29);
145 Reserved.set(Mips::HWR29_64);
147 // Reserve DSP control register.
148 Reserved.set(Mips::DSPCtrl);
150 // Reserve RA if in mips16 mode.
151 if (Subtarget.inMips16Mode()) {
152 Reserved.set(Mips::RA);
153 Reserved.set(Mips::RA_64);
156 // Reserve GP if small section is used.
157 if (Subtarget.useSmallSection()) {
158 Reserved.set(Mips::GP);
159 Reserved.set(Mips::GP_64);
166 MipsRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
171 MipsRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
175 // FrameIndex represent objects inside a abstract stack.
176 // We must replace FrameIndex with an stack/frame pointer
178 void MipsRegisterInfo::
179 eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
180 unsigned FIOperandNum, RegScavenger *RS) const {
181 MachineInstr &MI = *II;
182 MachineFunction &MF = *MI.getParent()->getParent();
184 DEBUG(errs() << "\nFunction : " << MF.getName() << "\n";
185 errs() << "<--------->\n" << MI);
187 int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
188 uint64_t stackSize = MF.getFrameInfo()->getStackSize();
189 int64_t spOffset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
191 DEBUG(errs() << "FrameIndex : " << FrameIndex << "\n"
192 << "spOffset : " << spOffset << "\n"
193 << "stackSize : " << stackSize << "\n");
195 eliminateFI(MI, FIOperandNum, FrameIndex, stackSize, spOffset);
198 unsigned MipsRegisterInfo::
199 getFrameRegister(const MachineFunction &MF) const {
200 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
201 bool IsN64 = Subtarget.isABI_N64();
203 if (Subtarget.inMips16Mode())
204 return TFI->hasFP(MF) ? Mips::S0 : Mips::SP;
206 return TFI->hasFP(MF) ? (IsN64 ? Mips::FP_64 : Mips::FP) :
207 (IsN64 ? Mips::SP_64 : Mips::SP);
211 unsigned MipsRegisterInfo::
212 getEHExceptionRegister() const {
213 llvm_unreachable("What is the exception register");
216 unsigned MipsRegisterInfo::
217 getEHHandlerRegister() const {
218 llvm_unreachable("What is the exception handler register");