MipsInstrFormats.td revision 0dad34a9bf850132e9ec84397f13604143c3aeff
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 223class SRA_FM<bits<6> funct, bit rotate> { 224 bits<5> rd; 225 bits<5> rt; 226 bits<5> shamt; 227 228 bits<32> Inst; 229 230 let Inst{31-26} = 0; 231 let Inst{25-22} = 0; 232 let Inst{21} = rotate; 233 let Inst{20-16} = rt; 234 let Inst{15-11} = rd; 235 let Inst{10-6} = shamt; 236 let Inst{5-0} = funct; 237} 238 239//===----------------------------------------------------------------------===// 240// 241// FLOATING POINT INSTRUCTION FORMATS 242// 243// opcode - operation code. 244// fs - src reg. 245// ft - dst reg (on a 2 regs instr) or src reg (on a 3 reg instr). 246// fd - dst reg, only used on 3 regs instr. 247// fmt - double or single precision. 248// funct - combined with opcode field give us an operation code. 249// 250//===----------------------------------------------------------------------===// 251 252//===----------------------------------------------------------------------===// 253// Format FI instruction class in Mips : <|opcode|base|ft|immediate|> 254//===----------------------------------------------------------------------===// 255 256class FFI<bits<6> op, dag outs, dag ins, string asmstr, list<dag> pattern>: 257 InstSE<outs, ins, asmstr, pattern, NoItinerary, FrmFI> 258{ 259 bits<5> ft; 260 bits<5> base; 261 bits<16> imm16; 262 263 let Opcode = op; 264 265 let Inst{25-21} = base; 266 let Inst{20-16} = ft; 267 let Inst{15-0} = imm16; 268} 269 270class ADDS_FM<bits<6> funct, bits<5> fmt> { 271 bits<5> fd; 272 bits<5> fs; 273 bits<5> ft; 274 275 bits<32> Inst; 276 277 let Inst{31-26} = 0x11; 278 let Inst{25-21} = fmt; 279 let Inst{20-16} = ft; 280 let Inst{15-11} = fs; 281 let Inst{10-6} = fd; 282 let Inst{5-0} = funct; 283} 284 285class ABSS_FM<bits<6> funct, bits<5> fmt> { 286 bits<5> fd; 287 bits<5> fs; 288 289 bits<32> Inst; 290 291 let Inst{31-26} = 0x11; 292 let Inst{25-21} = fmt; 293 let Inst{20-16} = 0; 294 let Inst{15-11} = fs; 295 let Inst{10-6} = fd; 296 let Inst{5-0} = funct; 297} 298 299class MFC1_FM<bits<5> funct> { 300 bits<5> rt; 301 bits<5> fs; 302 303 bits<32> Inst; 304 305 let Inst{31-26} = 0x11; 306 let Inst{25-21} = funct; 307 let Inst{20-16} = rt; 308 let Inst{15-11} = fs; 309 let Inst{10-0} = 0; 310} 311 312class LW_FM<bits<6> op> { 313 bits<5> rt; 314 bits<21> addr; 315 316 bits<32> Inst; 317 318 let Inst{31-26} = op; 319 let Inst{25-21} = addr{20-16}; 320 let Inst{20-16} = rt; 321 let Inst{15-0} = addr{15-0}; 322} 323 324class MADDS_FM<bits<3> funct, bits<3> fmt> { 325 bits<5> fd; 326 bits<5> fr; 327 bits<5> fs; 328 bits<5> ft; 329 330 bits<32> Inst; 331 332 let Inst{31-26} = 0x13; 333 let Inst{25-21} = fr; 334 let Inst{20-16} = ft; 335 let Inst{15-11} = fs; 336 let Inst{10-6} = fd; 337 let Inst{5-3} = funct; 338 let Inst{2-0} = fmt; 339} 340 341class LWXC1_FM<bits<6> funct> { 342 bits<5> fd; 343 bits<5> base; 344 bits<5> index; 345 346 bits<32> Inst; 347 348 let Inst{31-26} = 0x13; 349 let Inst{25-21} = base; 350 let Inst{20-16} = index; 351 let Inst{15-11} = 0; 352 let Inst{10-6} = fd; 353 let Inst{5-0} = funct; 354} 355 356class SWXC1_FM<bits<6> funct> { 357 bits<5> fs; 358 bits<5> base; 359 bits<5> index; 360 361 bits<32> Inst; 362 363 let Inst{31-26} = 0x13; 364 let Inst{25-21} = base; 365 let Inst{20-16} = index; 366 let Inst{15-11} = fs; 367 let Inst{10-6} = 0; 368 let Inst{5-0} = funct; 369} 370 371class BC1F_FM<bit nd, bit tf> { 372 bits<16> offset; 373 374 bits<32> Inst; 375 376 let Inst{31-26} = 0x11; 377 let Inst{25-21} = 0x8; 378 let Inst{20-18} = 0; // cc 379 let Inst{17} = nd; 380 let Inst{16} = tf; 381 let Inst{15-0} = offset; 382} 383 384class CEQS_FM<bits<5> fmt> { 385 bits<5> fs; 386 bits<5> ft; 387 bits<4> cond; 388 389 bits<32> Inst; 390 391 let Inst{31-26} = 0x11; 392 let Inst{25-21} = fmt; 393 let Inst{20-16} = ft; 394 let Inst{15-11} = fs; 395 let Inst{10-8} = 0; // cc 396 let Inst{7-4} = 0x3; 397 let Inst{3-0} = cond; 398} 399 400class CMov_I_F_FM<bits<6> funct, bits<5> fmt> { 401 bits<5> fd; 402 bits<5> fs; 403 bits<5> rt; 404 405 bits<32> Inst; 406 407 let Inst{31-26} = 0x11; 408 let Inst{25-21} = fmt; 409 let Inst{20-16} = rt; 410 let Inst{15-11} = fs; 411 let Inst{10-6} = fd; 412 let Inst{5-0} = funct; 413} 414 415class CMov_F_I_FM<bit tf> { 416 bits<5> rd; 417 bits<5> rs; 418 419 bits<32> Inst; 420 421 let Inst{31-26} = 0; 422 let Inst{25-21} = rs; 423 let Inst{20-18} = 0; // cc 424 let Inst{17} = 0; 425 let Inst{16} = tf; 426 let Inst{15-11} = rd; 427 let Inst{10-6} = 0; 428 let Inst{5-0} = 1; 429} 430 431class CMov_F_F_FM<bits<5> fmt, bit tf> { 432 bits<5> fd; 433 bits<5> fs; 434 435 bits<32> Inst; 436 437 let Inst{31-26} = 0x11; 438 let Inst{25-21} = fmt; 439 let Inst{20-18} = 0; // cc 440 let Inst{17} = 0; 441 let Inst{16} = tf; 442 let Inst{15-11} = fs; 443 let Inst{10-6} = fd; 444 let Inst{5-0} = 0x11; 445} 446