MipsInstrFormats.td revision ab48c503e231c9a3c9ccccbb57c0a3a7a4302a75
1//===-- MipsInstrFormats.td - Mips Instruction Formats -----*- tablegen -*-===// 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//===----------------------------------------------------------------------===// 11// Describe MIPS instructions format 12// 13// CPU INSTRUCTION FORMATS 14// 15// opcode - operation code. 16// rs - src reg. 17// rt - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr). 18// rd - dst reg, only used on 3 regs instr. 19// shamt - only used on shift instructions, contains the shift amount. 20// funct - combined with opcode field give us an operation code. 21// 22//===----------------------------------------------------------------------===// 23 24// Format specifies the encoding used by the instruction. This is part of the 25// ad-hoc solution used to emit machine instruction encodings by our machine 26// code emitter. 27class Format<bits<4> val> { 28 bits<4> Value = val; 29} 30 31def Pseudo : Format<0>; 32def FrmR : Format<1>; 33def FrmI : Format<2>; 34def FrmJ : Format<3>; 35def FrmFR : Format<4>; 36def FrmFI : Format<5>; 37def FrmOther : Format<6>; // Instruction w/ a custom format 38 39// Generic Mips Format 40class MipsInst<dag outs, dag ins, string asmstr, list<dag> pattern, 41 InstrItinClass itin, Format f>: Instruction 42{ 43 field bits<32> Inst; 44 Format Form = f; 45 46 let Namespace = "Mips"; 47 48 let Size = 4; 49 50 bits<6> Opcode = 0; 51 52 // Top 6 bits are the 'opcode' field 53 let Inst{31-26} = Opcode; 54 55 let OutOperandList = outs; 56 let InOperandList = ins; 57 58 let AsmString = asmstr; 59 let Pattern = pattern; 60 let Itinerary = itin; 61 62 // 63 // Attributes specific to Mips instructions... 64 // 65 bits<4> FormBits = Form.Value; 66 67 // TSFlags layout should be kept in sync with MipsInstrInfo.h. 68 let TSFlags{3-0} = FormBits; 69 70 let DecoderNamespace = "Mips"; 71 72 field bits<32> SoftFail = 0; 73} 74 75// Mips32/64 Instruction Format 76class InstSE<dag outs, dag ins, string asmstr, list<dag> pattern, 77 InstrItinClass itin, Format f>: 78 MipsInst<outs, ins, asmstr, pattern, itin, f> { 79 let Predicates = [HasStdEnc]; 80} 81 82// Mips Pseudo Instructions Format 83class MipsPseudo<dag outs, dag ins, string asmstr, list<dag> pattern>: 84 MipsInst<outs, ins, asmstr, pattern, IIPseudo, Pseudo> { 85 let isCodeGenOnly = 1; 86 let isPseudo = 1; 87} 88 89// Mips32/64 Pseudo Instruction Format 90class PseudoSE<dag outs, dag ins, string asmstr, list<dag> pattern>: 91 MipsPseudo<outs, ins, asmstr, pattern> { 92 let Predicates = [HasStdEnc]; 93} 94 95// Pseudo-instructions for alternate assembly syntax (never used by codegen). 96// These are aliases that require C++ handling to convert to the target 97// instruction, while InstAliases can be handled directly by tblgen. 98class MipsAsmPseudoInst<dag outs, dag ins, string asmstr>: 99 MipsInst<outs, ins, asmstr, [], IIPseudo, Pseudo> { 100 let isPseudo = 1; 101 let Pattern = []; 102} 103//===----------------------------------------------------------------------===// 104// Format R instruction class in Mips : <|opcode|rs|rt|rd|shamt|funct|> 105//===----------------------------------------------------------------------===// 106 107class FR<bits<6> op, bits<6> _funct, dag outs, dag ins, string asmstr, 108 list<dag> pattern, InstrItinClass itin>: 109 InstSE<outs, ins, asmstr, pattern, itin, FrmR> 110{ 111 bits<5> rd; 112 bits<5> rs; 113 bits<5> rt; 114 bits<5> shamt; 115 bits<6> funct; 116 117 let Opcode = op; 118 let funct = _funct; 119 120 let Inst{25-21} = rs; 121 let Inst{20-16} = rt; 122 let Inst{15-11} = rd; 123 let Inst{10-6} = shamt; 124 let Inst{5-0} = funct; 125} 126 127//===----------------------------------------------------------------------===// 128// Format I instruction class in Mips : <|opcode|rs|rt|immediate|> 129//===----------------------------------------------------------------------===// 130 131class FI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern, 132 InstrItinClass itin>: InstSE<outs, ins, asmstr, pattern, itin, FrmI> 133{ 134 bits<5> rt; 135 bits<5> rs; 136 bits<16> imm16; 137 138 let Opcode = op; 139 140 let Inst{25-21} = rs; 141 let Inst{20-16} = rt; 142 let Inst{15-0} = imm16; 143} 144 145class BranchBase<bits<6> op, dag outs, dag ins, string asmstr, 146 list<dag> pattern, InstrItinClass itin>: 147 InstSE<outs, ins, asmstr, pattern, itin, FrmI> 148{ 149 bits<5> rs; 150 bits<5> rt; 151 bits<16> imm16; 152 153 let Opcode = op; 154 155 let Inst{25-21} = rs; 156 let Inst{20-16} = rt; 157 let Inst{15-0} = imm16; 158} 159 160//===----------------------------------------------------------------------===// 161// Format J instruction class in Mips : <|opcode|address|> 162//===----------------------------------------------------------------------===// 163 164class FJ<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern, 165 InstrItinClass itin>: InstSE<outs, ins, asmstr, pattern, itin, FrmJ> 166{ 167 bits<26> addr; 168 169 let Opcode = op; 170 171 let Inst{25-0} = addr; 172} 173 174 //===----------------------------------------------------------------------===// 175// MFC instruction class in Mips : <|op|mf|rt|rd|0000000|sel|> 176//===----------------------------------------------------------------------===// 177class MFC3OP<bits<6> op, bits<5> _mfmt, dag outs, dag ins, string asmstr>: 178 InstSE<outs, ins, asmstr, [], NoItinerary, FrmFR> 179{ 180 bits<5> mfmt; 181 bits<5> rt; 182 bits<5> rd; 183 bits<3> sel; 184 185 let Opcode = op; 186 let mfmt = _mfmt; 187 188 let Inst{25-21} = mfmt; 189 let Inst{20-16} = rt; 190 let Inst{15-11} = rd; 191 let Inst{10-3} = 0; 192 let Inst{2-0} = sel; 193} 194 195class ADD_FM<bits<6> op, bits<6> funct> { 196 bits<5> rd; 197 bits<5> rs; 198 bits<5> rt; 199 200 bits<32> Inst; 201 202 let Inst{31-26} = op; 203 let Inst{25-21} = rs; 204 let Inst{20-16} = rt; 205 let Inst{15-11} = rd; 206 let Inst{10-6} = 0; 207 let Inst{5-0} = funct; 208} 209 210class ADDI_FM<bits<6> op> { 211 bits<5> rs; 212 bits<5> rt; 213 bits<16> imm16; 214 215 bits<32> Inst; 216 217 let Inst{31-26} = op; 218 let Inst{25-21} = rs; 219 let Inst{20-16} = rt; 220 let Inst{15-0} = imm16; 221} 222 223//===----------------------------------------------------------------------===// 224// 225// FLOATING POINT INSTRUCTION FORMATS 226// 227// opcode - operation code. 228// fs - src reg. 229// ft - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr). 230// fd - dst reg, only used on 3 regs instr. 231// fmt - double or single precision. 232// funct - combined with opcode field give us an operation code. 233// 234//===----------------------------------------------------------------------===// 235 236//===----------------------------------------------------------------------===// 237// Format FI instruction class in Mips : <|opcode|base|ft|immediate|> 238//===----------------------------------------------------------------------===// 239 240class FFI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern>: 241 InstSE<outs, ins, asmstr, pattern, NoItinerary, FrmFI> 242{ 243 bits<5> ft; 244 bits<5> base; 245 bits<16> imm16; 246 247 let Opcode = op; 248 249 let Inst{25-21} = base; 250 let Inst{20-16} = ft; 251 let Inst{15-0} = imm16; 252} 253 254class ADDS_FM<bits<6> funct, bits<5> fmt> { 255 bits<5> fd; 256 bits<5> fs; 257 bits<5> ft; 258 259 bits<32> Inst; 260 261 let Inst{31-26} = 0x11; 262 let Inst{25-21} = fmt; 263 let Inst{20-16} = ft; 264 let Inst{15-11} = fs; 265 let Inst{10-6} = fd; 266 let Inst{5-0} = funct; 267} 268 269class ABSS_FM<bits<6> funct, bits<5> fmt> { 270 bits<5> fd; 271 bits<5> fs; 272 273 bits<32> Inst; 274 275 let Inst{31-26} = 0x11; 276 let Inst{25-21} = fmt; 277 let Inst{20-16} = 0; 278 let Inst{15-11} = fs; 279 let Inst{10-6} = fd; 280 let Inst{5-0} = funct; 281} 282 283class MFC1_FM<bits<5> funct> { 284 bits<5> rt; 285 bits<5> fs; 286 287 bits<32> Inst; 288 289 let Inst{31-26} = 0x11; 290 let Inst{25-21} = funct; 291 let Inst{20-16} = rt; 292 let Inst{15-11} = fs; 293 let Inst{10-0} = 0; 294} 295 296class LW_FM<bits<6> op> { 297 bits<5> rt; 298 bits<21> addr; 299 300 bits<32> Inst; 301 302 let Inst{31-26} = op; 303 let Inst{25-21} = addr{20-16}; 304 let Inst{20-16} = rt; 305 let Inst{15-0} = addr{15-0}; 306} 307 308class MADDS_FM<bits<3> funct, bits<3> fmt> { 309 bits<5> fd; 310 bits<5> fr; 311 bits<5> fs; 312 bits<5> ft; 313 314 bits<32> Inst; 315 316 let Inst{31-26} = 0x13; 317 let Inst{25-21} = fr; 318 let Inst{20-16} = ft; 319 let Inst{15-11} = fs; 320 let Inst{10-6} = fd; 321 let Inst{5-3} = funct; 322 let Inst{2-0} = fmt; 323} 324 325class LWXC1_FM<bits<6> funct> { 326 bits<5> fd; 327 bits<5> base; 328 bits<5> index; 329 330 bits<32> Inst; 331 332 let Inst{31-26} = 0x13; 333 let Inst{25-21} = base; 334 let Inst{20-16} = index; 335 let Inst{15-11} = 0; 336 let Inst{10-6} = fd; 337 let Inst{5-0} = funct; 338} 339 340class SWXC1_FM<bits<6> funct> { 341 bits<5> fs; 342 bits<5> base; 343 bits<5> index; 344 345 bits<32> Inst; 346 347 let Inst{31-26} = 0x13; 348 let Inst{25-21} = base; 349 let Inst{20-16} = index; 350 let Inst{15-11} = fs; 351 let Inst{10-6} = 0; 352 let Inst{5-0} = funct; 353} 354 355class BC1F_FM<bit nd, bit tf> { 356 bits<16> offset; 357 358 bits<32> Inst; 359 360 let Inst{31-26} = 0x11; 361 let Inst{25-21} = 0x8; 362 let Inst{20-18} = 0; // cc 363 let Inst{17} = nd; 364 let Inst{16} = tf; 365 let Inst{15-0} = offset; 366} 367 368class CEQS_FM<bits<5> fmt> { 369 bits<5> fs; 370 bits<5> ft; 371 bits<4> cond; 372 373 bits<32> Inst; 374 375 let Inst{31-26} = 0x11; 376 let Inst{25-21} = fmt; 377 let Inst{20-16} = ft; 378 let Inst{15-11} = fs; 379 let Inst{10-8} = 0; // cc 380 let Inst{7-4} = 0x3; 381 let Inst{3-0} = cond; 382} 383 384class CMov_I_F_FM<bits<6> funct, bits<5> fmt> { 385 bits<5> fd; 386 bits<5> fs; 387 bits<5> rt; 388 389 bits<32> Inst; 390 391 let Inst{31-26} = 0x11; 392 let Inst{25-21} = fmt; 393 let Inst{20-16} = rt; 394 let Inst{15-11} = fs; 395 let Inst{10-6} = fd; 396 let Inst{5-0} = funct; 397} 398 399class CMov_F_I_FM<bit tf> { 400 bits<5> rd; 401 bits<5> rs; 402 403 bits<32> Inst; 404 405 let Inst{31-26} = 0; 406 let Inst{25-21} = rs; 407 let Inst{20-18} = 0; // cc 408 let Inst{17} = 0; 409 let Inst{16} = tf; 410 let Inst{15-11} = rd; 411 let Inst{10-6} = 0; 412 let Inst{5-0} = 1; 413} 414 415class CMov_F_F_FM<bits<5> fmt, bit tf> { 416 bits<5> fd; 417 bits<5> fs; 418 419 bits<32> Inst; 420 421 let Inst{31-26} = 0x11; 422 let Inst{25-21} = fmt; 423 let Inst{20-18} = 0; // cc 424 let Inst{17} = 0; 425 let Inst{16} = tf; 426 let Inst{15-11} = fs; 427 let Inst{10-6} = fd; 428 let Inst{5-0} = 0x11; 429} 430