1 //===-- MipsMCInstLower.cpp - Convert Mips MachineInstr to MCInst ---------===//
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 code to lower Mips MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "MipsMCInstLower.h"
16 #include "MipsAsmPrinter.h"
17 #include "MipsInstrInfo.h"
18 #include "MCTargetDesc/MipsBaseInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstr.h"
21 #include "llvm/CodeGen/MachineOperand.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 #include "llvm/Target/Mangler.h"
29 MipsMCInstLower::MipsMCInstLower(MipsAsmPrinter &asmprinter)
30 : AsmPrinter(asmprinter) {}
32 void MipsMCInstLower::Initialize(Mangler *M, MCContext* C) {
37 MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
38 MachineOperandType MOTy,
39 unsigned Offset) const {
40 MCSymbolRefExpr::VariantKind Kind;
41 const MCSymbol *Symbol;
43 switch(MO.getTargetFlags()) {
44 default: llvm_unreachable("Invalid target flag!");
45 case MipsII::MO_NO_FLAG: Kind = MCSymbolRefExpr::VK_None; break;
46 case MipsII::MO_GPREL: Kind = MCSymbolRefExpr::VK_Mips_GPREL; break;
47 case MipsII::MO_GOT_CALL: Kind = MCSymbolRefExpr::VK_Mips_GOT_CALL; break;
48 case MipsII::MO_GOT16: Kind = MCSymbolRefExpr::VK_Mips_GOT16; break;
49 case MipsII::MO_GOT: Kind = MCSymbolRefExpr::VK_Mips_GOT; break;
50 case MipsII::MO_ABS_HI: Kind = MCSymbolRefExpr::VK_Mips_ABS_HI; break;
51 case MipsII::MO_ABS_LO: Kind = MCSymbolRefExpr::VK_Mips_ABS_LO; break;
52 case MipsII::MO_TLSGD: Kind = MCSymbolRefExpr::VK_Mips_TLSGD; break;
53 case MipsII::MO_TLSLDM: Kind = MCSymbolRefExpr::VK_Mips_TLSLDM; break;
54 case MipsII::MO_DTPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_HI; break;
55 case MipsII::MO_DTPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_LO; break;
56 case MipsII::MO_GOTTPREL: Kind = MCSymbolRefExpr::VK_Mips_GOTTPREL; break;
57 case MipsII::MO_TPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_TPREL_HI; break;
58 case MipsII::MO_TPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_TPREL_LO; break;
59 case MipsII::MO_GPOFF_HI: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_HI; break;
60 case MipsII::MO_GPOFF_LO: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_LO; break;
61 case MipsII::MO_GOT_DISP: Kind = MCSymbolRefExpr::VK_Mips_GOT_DISP; break;
62 case MipsII::MO_GOT_PAGE: Kind = MCSymbolRefExpr::VK_Mips_GOT_PAGE; break;
63 case MipsII::MO_GOT_OFST: Kind = MCSymbolRefExpr::VK_Mips_GOT_OFST; break;
67 case MachineOperand::MO_MachineBasicBlock:
68 Symbol = MO.getMBB()->getSymbol();
71 case MachineOperand::MO_GlobalAddress:
72 Symbol = Mang->getSymbol(MO.getGlobal());
73 Offset += MO.getOffset();
76 case MachineOperand::MO_BlockAddress:
77 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
78 Offset += MO.getOffset();
81 case MachineOperand::MO_ExternalSymbol:
82 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
83 Offset += MO.getOffset();
86 case MachineOperand::MO_JumpTableIndex:
87 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
90 case MachineOperand::MO_ConstantPoolIndex:
91 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
92 Offset += MO.getOffset();
96 llvm_unreachable("<unknown operand type>");
99 const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::Create(Symbol, Kind, *Ctx);
102 return MCOperand::CreateExpr(MCSym);
104 // Assume offset is never negative.
107 const MCConstantExpr *OffsetExpr = MCConstantExpr::Create(Offset, *Ctx);
108 const MCBinaryExpr *AddExpr = MCBinaryExpr::CreateAdd(MCSym, OffsetExpr, *Ctx);
109 return MCOperand::CreateExpr(AddExpr);
112 static void CreateMCInst(MCInst& Inst, unsigned Opc, const MCOperand& Opnd0,
113 const MCOperand& Opnd1,
114 const MCOperand& Opnd2 = MCOperand()) {
116 Inst.addOperand(Opnd0);
117 Inst.addOperand(Opnd1);
119 Inst.addOperand(Opnd2);
122 MCOperand MipsMCInstLower::LowerOperand(const MachineOperand& MO,
123 unsigned offset) const {
124 MachineOperandType MOTy = MO.getType();
127 default: llvm_unreachable("unknown operand type");
128 case MachineOperand::MO_Register:
129 // Ignore all implicit register operands.
130 if (MO.isImplicit()) break;
131 return MCOperand::CreateReg(MO.getReg());
132 case MachineOperand::MO_Immediate:
133 return MCOperand::CreateImm(MO.getImm() + offset);
134 case MachineOperand::MO_MachineBasicBlock:
135 case MachineOperand::MO_GlobalAddress:
136 case MachineOperand::MO_ExternalSymbol:
137 case MachineOperand::MO_JumpTableIndex:
138 case MachineOperand::MO_ConstantPoolIndex:
139 case MachineOperand::MO_BlockAddress:
140 return LowerSymbolOperand(MO, MOTy, offset);
141 case MachineOperand::MO_RegisterMask:
148 void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
149 OutMI.setOpcode(MI->getOpcode());
151 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
152 const MachineOperand &MO = MI->getOperand(i);
153 MCOperand MCOp = LowerOperand(MO);
156 OutMI.addOperand(MCOp);
160 void MipsMCInstLower::LowerUnalignedLoadStore(const MachineInstr *MI,
163 unsigned Opc = MI->getOpcode();
164 MCInst Instr1, Instr2, Instr3, Move;
166 bool TwoInstructions = false;
168 assert(MI->getNumOperands() == 3);
169 assert(MI->getOperand(0).isReg());
170 assert(MI->getOperand(1).isReg());
172 MCOperand Target = LowerOperand(MI->getOperand(0));
173 MCOperand Base = LowerOperand(MI->getOperand(1));
174 MCOperand ATReg = MCOperand::CreateReg(Mips::AT);
175 MCOperand ZeroReg = MCOperand::CreateReg(Mips::ZERO);
177 MachineOperand UnLoweredName = MI->getOperand(2);
178 MCOperand Name = LowerOperand(UnLoweredName);
180 Move.setOpcode(Mips::ADDu);
181 Move.addOperand(Target);
182 Move.addOperand(ATReg);
183 Move.addOperand(ZeroReg);
187 // FIXME: only works for little endian right now
188 MCOperand AdjName = LowerOperand(UnLoweredName, 3);
189 if (Base.getReg() == (Target.getReg())) {
190 Instr1.setOpcode(Mips::LWL);
191 Instr1.addOperand(ATReg);
192 Instr1.addOperand(Base);
193 Instr1.addOperand(AdjName);
194 Instr2.setOpcode(Mips::LWR);
195 Instr2.addOperand(ATReg);
196 Instr2.addOperand(Base);
197 Instr2.addOperand(Name);
200 TwoInstructions = true;
201 Instr1.setOpcode(Mips::LWL);
202 Instr1.addOperand(Target);
203 Instr1.addOperand(Base);
204 Instr1.addOperand(AdjName);
205 Instr2.setOpcode(Mips::LWR);
206 Instr2.addOperand(Target);
207 Instr2.addOperand(Base);
208 Instr2.addOperand(Name);
213 // FIXME: only works for little endian right now
214 MCOperand AdjName = LowerOperand(UnLoweredName, 1);
215 Instr1.setOpcode(Mips::LBu);
216 Instr1.addOperand(ATReg);
217 Instr1.addOperand(Base);
218 Instr1.addOperand(AdjName);
219 Instr2.setOpcode(Mips::LBu);
220 Instr2.addOperand(Target);
221 Instr2.addOperand(Base);
222 Instr2.addOperand(Name);
223 Instr3.setOpcode(Mips::INS);
224 Instr3.addOperand(Target);
225 Instr3.addOperand(ATReg);
226 Instr3.addOperand(MCOperand::CreateImm(0x8));
227 Instr3.addOperand(MCOperand::CreateImm(0x18));
232 // FIXME: only works for little endian right now
233 assert (Base.getReg() != Target.getReg());
234 TwoInstructions = true;
235 MCOperand AdjName = LowerOperand(UnLoweredName, 3);
236 Instr1.setOpcode(Mips::SWL);
237 Instr1.addOperand(Target);
238 Instr1.addOperand(Base);
239 Instr1.addOperand(AdjName);
240 Instr2.setOpcode(Mips::SWR);
241 Instr2.addOperand(Target);
242 Instr2.addOperand(Base);
243 Instr2.addOperand(Name);
247 MCOperand AdjName = LowerOperand(UnLoweredName, 1);
248 Instr1.setOpcode(Mips::SB);
249 Instr1.addOperand(Target);
250 Instr1.addOperand(Base);
251 Instr1.addOperand(Name);
252 Instr2.setOpcode(Mips::SRL);
253 Instr2.addOperand(ATReg);
254 Instr2.addOperand(Target);
255 Instr2.addOperand(MCOperand::CreateImm(8));
256 Instr3.setOpcode(Mips::SB);
257 Instr3.addOperand(ATReg);
258 Instr3.addOperand(Base);
259 Instr3.addOperand(AdjName);
263 // FIXME: need to add others
264 llvm_unreachable("unaligned instruction not processed");
267 MCInsts.push_back(Instr1);
268 MCInsts.push_back(Instr2);
269 if (!TwoInstructions) MCInsts.push_back(Instr3);
272 // Create the following two instructions:
273 // "lui $2, %hi(_gp_disp)"
274 // "addiu $2, $2, %lo(_gp_disp)"
275 void MipsMCInstLower::LowerSETGP01(SmallVector<MCInst, 4>& MCInsts) {
276 MCOperand RegOpnd = MCOperand::CreateReg(Mips::V0);
277 StringRef SymName("_gp_disp");
278 const MCSymbol *Sym = Ctx->GetOrCreateSymbol(SymName);
279 const MCSymbolRefExpr *MCSym;
281 MCSym = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_Mips_ABS_HI, *Ctx);
282 MCOperand SymHi = MCOperand::CreateExpr(MCSym);
283 MCSym = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_Mips_ABS_LO, *Ctx);
284 MCOperand SymLo = MCOperand::CreateExpr(MCSym);
288 CreateMCInst(MCInsts[0], Mips::LUi, RegOpnd, SymHi);
289 CreateMCInst(MCInsts[1], Mips::ADDiu, RegOpnd, RegOpnd, SymLo);