MipsInstrFormats.td revision 7de001b97e1087b393efc90f7b10ffedd4f66fed
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, list<dag> pattern, 84 InstrItinClass itin = IIPseudo> : 85 MipsInst<outs, ins, "", pattern, itin, Pseudo> { 86 let isCodeGenOnly = 1; 87 let isPseudo = 1; 88} 89 90// Mips32/64 Pseudo Instruction Format 91class PseudoSE<dag outs, dag ins, list<dag> pattern, 92 InstrItinClass itin = IIPseudo>: 93 MipsPseudo<outs, ins, pattern, itin> { 94 let Predicates = [HasStdEnc]; 95} 96 97// Pseudo-instructions for alternate assembly syntax (never used by codegen). 98// These are aliases that require C++ handling to convert to the target 99// instruction, while InstAliases can be handled directly by tblgen. 100class MipsAsmPseudoInst<dag outs, dag ins, string asmstr>: 101 MipsInst<outs, ins, asmstr, [], IIPseudo, Pseudo> { 102 let isPseudo = 1; 103 let Pattern = []; 104} 105//===----------------------------------------------------------------------===// 106// Format R instruction class in Mips : <|opcode|rs|rt|rd|shamt|funct|> 107//===----------------------------------------------------------------------===// 108 109class FR<bits<6> op, bits<6> _funct, dag outs, dag ins, string asmstr, 110 list<dag> pattern, InstrItinClass itin>: 111 InstSE<outs, ins, asmstr, pattern, itin, FrmR> 112{ 113 bits<5> rd; 114 bits<5> rs; 115 bits<5> rt; 116 bits<5> shamt; 117 bits<6> funct; 118 119 let Opcode = op; 120 let funct = _funct; 121 122 let Inst{25-21} = rs; 123 let Inst{20-16} = rt; 124 let Inst{15-11} = rd; 125 let Inst{10-6} = shamt; 126 let Inst{5-0} = funct; 127} 128 129//===----------------------------------------------------------------------===// 130// Format I instruction class in Mips : <|opcode|rs|rt|immediate|> 131//===----------------------------------------------------------------------===// 132 133class FI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern, 134 InstrItinClass itin>: InstSE<outs, ins, asmstr, pattern, itin, FrmI> 135{ 136 bits<5> rt; 137 bits<5> rs; 138 bits<16> imm16; 139 140 let Opcode = op; 141 142 let Inst{25-21} = rs; 143 let Inst{20-16} = rt; 144 let Inst{15-0} = imm16; 145} 146 147class BranchBase<bits<6> op, dag outs, dag ins, string asmstr, 148 list<dag> pattern, InstrItinClass itin>: 149 InstSE<outs, ins, asmstr, pattern, itin, FrmI> 150{ 151 bits<5> rs; 152 bits<5> rt; 153 bits<16> imm16; 154 155 let Opcode = op; 156 157 let Inst{25-21} = rs; 158 let Inst{20-16} = rt; 159 let Inst{15-0} = imm16; 160} 161 162//===----------------------------------------------------------------------===// 163// Format J instruction class in Mips : <|opcode|address|> 164//===----------------------------------------------------------------------===// 165 166class FJ<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern, 167 InstrItinClass itin>: InstSE<outs, ins, asmstr, pattern, itin, FrmJ> 168{ 169 bits<26> addr; 170 171 let Opcode = op; 172 173 let Inst{25-0} = addr; 174} 175 176 //===----------------------------------------------------------------------===// 177// MFC instruction class in Mips : <|op|mf|rt|rd|0000000|sel|> 178//===----------------------------------------------------------------------===// 179class MFC3OP<bits<6> op, bits<5> _mfmt, dag outs, dag ins, string asmstr>: 180 InstSE<outs, ins, asmstr, [], NoItinerary, FrmFR> 181{ 182 bits<5> mfmt; 183 bits<5> rt; 184 bits<5> rd; 185 bits<3> sel; 186 187 let Opcode = op; 188 let mfmt = _mfmt; 189 190 let Inst{25-21} = mfmt; 191 let Inst{20-16} = rt; 192 let Inst{15-11} = rd; 193 let Inst{10-3} = 0; 194 let Inst{2-0} = sel; 195} 196 197class ADD_FM<bits<6> op, bits<6> funct> { 198 bits<5> rd; 199 bits<5> rs; 200 bits<5> rt; 201 202 bits<32> Inst; 203 204 let Inst{31-26} = op; 205 let Inst{25-21} = rs; 206 let Inst{20-16} = rt; 207 let Inst{15-11} = rd; 208 let Inst{10-6} = 0; 209 let Inst{5-0} = funct; 210} 211 212class ADDI_FM<bits<6> op> { 213 bits<5> rs; 214 bits<5> rt; 215 bits<16> imm16; 216 217 bits<32> Inst; 218 219 let Inst{31-26} = op; 220 let Inst{25-21} = rs; 221 let Inst{20-16} = rt; 222 let Inst{15-0} = imm16; 223} 224 225class SRA_FM<bits<6> funct, bit rotate> { 226 bits<5> rd; 227 bits<5> rt; 228 bits<5> shamt; 229 230 bits<32> Inst; 231 232 let Inst{31-26} = 0; 233 let Inst{25-22} = 0; 234 let Inst{21} = rotate; 235 let Inst{20-16} = rt; 236 let Inst{15-11} = rd; 237 let Inst{10-6} = shamt; 238 let Inst{5-0} = funct; 239} 240 241class SRLV_FM<bits<6> funct, bit rotate> { 242 bits<5> rd; 243 bits<5> rt; 244 bits<5> rs; 245 246 bits<32> Inst; 247 248 let Inst{31-26} = 0; 249 let Inst{25-21} = rs; 250 let Inst{20-16} = rt; 251 let Inst{15-11} = rd; 252 let Inst{10-7} = 0; 253 let Inst{6} = rotate; 254 let Inst{5-0} = funct; 255} 256 257class BEQ_FM<bits<6> op> { 258 bits<5> rs; 259 bits<5> rt; 260 bits<16> offset; 261 262 bits<32> Inst; 263 264 let Inst{31-26} = op; 265 let Inst{25-21} = rs; 266 let Inst{20-16} = rt; 267 let Inst{15-0} = offset; 268} 269 270class BGEZ_FM<bits<6> op, bits<5> funct> { 271 bits<5> rs; 272 bits<16> offset; 273 274 bits<32> Inst; 275 276 let Inst{31-26} = op; 277 let Inst{25-21} = rs; 278 let Inst{20-16} = funct; 279 let Inst{15-0} = offset; 280} 281 282class B_FM { 283 bits<16> offset; 284 285 bits<32> Inst; 286 287 let Inst{31-26} = 4; 288 let Inst{25-21} = 0; 289 let Inst{20-16} = 0; 290 let Inst{15-0} = offset; 291} 292 293class SLTI_FM<bits<6> op> { 294 bits<5> rt; 295 bits<5> rs; 296 bits<16> imm16; 297 298 bits<32> Inst; 299 300 let Inst{31-26} = op; 301 let Inst{25-21} = rs; 302 let Inst{20-16} = rt; 303 let Inst{15-0} = imm16; 304} 305 306class MFLO_FM<bits<6> funct> { 307 bits<5> rd; 308 309 bits<32> Inst; 310 311 let Inst{31-26} = 0; 312 let Inst{25-16} = 0; 313 let Inst{15-11} = rd; 314 let Inst{10-6} = 0; 315 let Inst{5-0} = funct; 316} 317 318class MTLO_FM<bits<6> funct> { 319 bits<5> rs; 320 321 bits<32> Inst; 322 323 let Inst{31-26} = 0; 324 let Inst{25-21} = rs; 325 let Inst{20-6} = 0; 326 let Inst{5-0} = funct; 327} 328 329//===----------------------------------------------------------------------===// 330// 331// FLOATING POINT INSTRUCTION FORMATS 332// 333// opcode - operation code. 334// fs - src reg. 335// ft - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr). 336// fd - dst reg, only used on 3 regs instr. 337// fmt - double or single precision. 338// funct - combined with opcode field give us an operation code. 339// 340//===----------------------------------------------------------------------===// 341 342//===----------------------------------------------------------------------===// 343// Format FI instruction class in Mips : <|opcode|base|ft|immediate|> 344//===----------------------------------------------------------------------===// 345 346class FFI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern>: 347 InstSE<outs, ins, asmstr, pattern, NoItinerary, FrmFI> 348{ 349 bits<5> ft; 350 bits<5> base; 351 bits<16> imm16; 352 353 let Opcode = op; 354 355 let Inst{25-21} = base; 356 let Inst{20-16} = ft; 357 let Inst{15-0} = imm16; 358} 359 360class ADDS_FM<bits<6> funct, bits<5> fmt> { 361 bits<5> fd; 362 bits<5> fs; 363 bits<5> ft; 364 365 bits<32> Inst; 366 367 let Inst{31-26} = 0x11; 368 let Inst{25-21} = fmt; 369 let Inst{20-16} = ft; 370 let Inst{15-11} = fs; 371 let Inst{10-6} = fd; 372 let Inst{5-0} = funct; 373} 374 375class ABSS_FM<bits<6> funct, bits<5> fmt> { 376 bits<5> fd; 377 bits<5> fs; 378 379 bits<32> Inst; 380 381 let Inst{31-26} = 0x11; 382 let Inst{25-21} = fmt; 383 let Inst{20-16} = 0; 384 let Inst{15-11} = fs; 385 let Inst{10-6} = fd; 386 let Inst{5-0} = funct; 387} 388 389class MFC1_FM<bits<5> funct> { 390 bits<5> rt; 391 bits<5> fs; 392 393 bits<32> Inst; 394 395 let Inst{31-26} = 0x11; 396 let Inst{25-21} = funct; 397 let Inst{20-16} = rt; 398 let Inst{15-11} = fs; 399 let Inst{10-0} = 0; 400} 401 402class LW_FM<bits<6> op> { 403 bits<5> rt; 404 bits<21> addr; 405 406 bits<32> Inst; 407 408 let Inst{31-26} = op; 409 let Inst{25-21} = addr{20-16}; 410 let Inst{20-16} = rt; 411 let Inst{15-0} = addr{15-0}; 412} 413 414class MADDS_FM<bits<3> funct, bits<3> fmt> { 415 bits<5> fd; 416 bits<5> fr; 417 bits<5> fs; 418 bits<5> ft; 419 420 bits<32> Inst; 421 422 let Inst{31-26} = 0x13; 423 let Inst{25-21} = fr; 424 let Inst{20-16} = ft; 425 let Inst{15-11} = fs; 426 let Inst{10-6} = fd; 427 let Inst{5-3} = funct; 428 let Inst{2-0} = fmt; 429} 430 431class LWXC1_FM<bits<6> funct> { 432 bits<5> fd; 433 bits<5> base; 434 bits<5> index; 435 436 bits<32> Inst; 437 438 let Inst{31-26} = 0x13; 439 let Inst{25-21} = base; 440 let Inst{20-16} = index; 441 let Inst{15-11} = 0; 442 let Inst{10-6} = fd; 443 let Inst{5-0} = funct; 444} 445 446class SWXC1_FM<bits<6> funct> { 447 bits<5> fs; 448 bits<5> base; 449 bits<5> index; 450 451 bits<32> Inst; 452 453 let Inst{31-26} = 0x13; 454 let Inst{25-21} = base; 455 let Inst{20-16} = index; 456 let Inst{15-11} = fs; 457 let Inst{10-6} = 0; 458 let Inst{5-0} = funct; 459} 460 461class BC1F_FM<bit nd, bit tf> { 462 bits<16> offset; 463 464 bits<32> Inst; 465 466 let Inst{31-26} = 0x11; 467 let Inst{25-21} = 0x8; 468 let Inst{20-18} = 0; // cc 469 let Inst{17} = nd; 470 let Inst{16} = tf; 471 let Inst{15-0} = offset; 472} 473 474class CEQS_FM<bits<5> fmt> { 475 bits<5> fs; 476 bits<5> ft; 477 bits<4> cond; 478 479 bits<32> Inst; 480 481 let Inst{31-26} = 0x11; 482 let Inst{25-21} = fmt; 483 let Inst{20-16} = ft; 484 let Inst{15-11} = fs; 485 let Inst{10-8} = 0; // cc 486 let Inst{7-4} = 0x3; 487 let Inst{3-0} = cond; 488} 489 490class CMov_I_F_FM<bits<6> funct, bits<5> fmt> { 491 bits<5> fd; 492 bits<5> fs; 493 bits<5> rt; 494 495 bits<32> Inst; 496 497 let Inst{31-26} = 0x11; 498 let Inst{25-21} = fmt; 499 let Inst{20-16} = rt; 500 let Inst{15-11} = fs; 501 let Inst{10-6} = fd; 502 let Inst{5-0} = funct; 503} 504 505class CMov_F_I_FM<bit tf> { 506 bits<5> rd; 507 bits<5> rs; 508 509 bits<32> Inst; 510 511 let Inst{31-26} = 0; 512 let Inst{25-21} = rs; 513 let Inst{20-18} = 0; // cc 514 let Inst{17} = 0; 515 let Inst{16} = tf; 516 let Inst{15-11} = rd; 517 let Inst{10-6} = 0; 518 let Inst{5-0} = 1; 519} 520 521class CMov_F_F_FM<bits<5> fmt, bit tf> { 522 bits<5> fd; 523 bits<5> fs; 524 525 bits<32> Inst; 526 527 let Inst{31-26} = 0x11; 528 let Inst{25-21} = fmt; 529 let Inst{20-18} = 0; // cc 530 let Inst{17} = 0; 531 let Inst{16} = tf; 532 let Inst{15-11} = fs; 533 let Inst{10-6} = fd; 534 let Inst{5-0} = 0x11; 535} 536