src/gallium/drivers/nouveau/codegen/nv50_ir_target_nvc0.cpp

   1 /*
   2  * Copyright 2011 Christoph Bumiller
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include "codegen/nv50_ir_target_nvc0.h"
  24
  25 namespace nv50_ir {
  26
  27 Target *getTargetNVC0(unsigned int chipset)
  28 {
  29    return new TargetNVC0(chipset);
  30 }
  31
  32 TargetNVC0::TargetNVC0(unsigned int card) :
  33    Target(card < 0x110, false, card >= 0xe4)
  34 {
  35    chipset = card;
  36    initOpInfo();
  37 }
  38
  39 // BULTINS / LIBRARY FUNCTIONS:
  40
  41 // lazyness -> will just hardcode everything for the time being
  42
  43 #include "lib/gf100.asm.h"
  44 #include "lib/gk104.asm.h"
  45 #include "lib/gk110.asm.h"
  46
  47 void
  48 TargetNVC0::getBuiltinCode(const uint32_t **code, uint32_t *size) const
  49 {
  50    switch (chipset & ~0xf) {
  51    case 0xe0:
  52       if (chipset < NVISA_GK20A_CHIPSET) {
  53          *code = (const uint32_t *)&gk104_builtin_code[0];
  54          *size = sizeof(gk104_builtin_code);
  55          break;
  56       }
  57       /* fall-through for GK20A */
  58    case 0xf0:
  59    case 0x100:
  60       *code = (const uint32_t *)&gk110_builtin_code[0];
  61       *size = sizeof(gk110_builtin_code);
  62       break;
  63    default:
  64       *code = (const uint32_t *)&gf100_builtin_code[0];
  65       *size = sizeof(gf100_builtin_code);
  66       break;
  67    }
  68 }
  69
  70 uint32_t
  71 TargetNVC0::getBuiltinOffset(int builtin) const
  72 {
  73    assert(builtin < NVC0_BUILTIN_COUNT);
  74
  75    switch (chipset & ~0xf) {
  76    case 0xe0:
  77       if (chipset < NVISA_GK20A_CHIPSET)
  78          return gk104_builtin_offsets[builtin];
  79       /* fall-through for GK20A */
  80    case 0xf0:
  81    case 0x100:
  82       return gk110_builtin_offsets[builtin];
  83    default:
  84       return gf100_builtin_offsets[builtin];
  85    }
  86 }
  87
  88 struct opProperties
  89 {
  90    operation op;
  91    unsigned int mNeg   : 4;
  92    unsigned int mAbs   : 4;
  93    unsigned int mNot   : 4;
  94    unsigned int mSat   : 4;
  95    unsigned int fConst : 3;
  96    unsigned int fImmd  : 4; // last bit indicates if full immediate is suppoted
  97 };
  98
  99 static const struct opProperties _initProps[] =
 100 {
 101    //           neg  abs  not  sat  c[]  imm
 102    { OP_ADD,    0x3, 0x3, 0x0, 0x8, 0x2, 0x2 | 0x8 },
 103    { OP_SUB,    0x3, 0x3, 0x0, 0x0, 0x2, 0x2 | 0x8 },
 104    { OP_MUL,    0x3, 0x0, 0x0, 0x8, 0x2, 0x2 | 0x8 },
 105    { OP_MAX,    0x3, 0x3, 0x0, 0x0, 0x2, 0x2 },
 106    { OP_MIN,    0x3, 0x3, 0x0, 0x0, 0x2, 0x2 },
 107    { OP_MAD,    0x7, 0x0, 0x0, 0x8, 0x6, 0x2 }, // special c[] constraint
 108    { OP_FMA,    0x7, 0x0, 0x0, 0x8, 0x6, 0x2 }, // keep the same as OP_MAD
 109    { OP_SHLADD, 0x5, 0x0, 0x0, 0x0, 0x4, 0x6 },
 110    { OP_MADSP,  0x0, 0x0, 0x0, 0x0, 0x6, 0x2 },
 111    { OP_ABS,    0x0, 0x0, 0x0, 0x0, 0x1, 0x0 },
 112    { OP_NEG,    0x0, 0x1, 0x0, 0x0, 0x1, 0x0 },
 113    { OP_CVT,    0x1, 0x1, 0x0, 0x8, 0x1, 0x0 },
 114    { OP_CEIL,   0x1, 0x1, 0x0, 0x8, 0x1, 0x0 },
 115    { OP_FLOOR,  0x1, 0x1, 0x0, 0x8, 0x1, 0x0 },
 116    { OP_TRUNC,  0x1, 0x1, 0x0, 0x8, 0x1, 0x0 },
 117    { OP_AND,    0x0, 0x0, 0x3, 0x0, 0x2, 0x2 | 0x8 },
 118    { OP_OR,     0x0, 0x0, 0x3, 0x0, 0x2, 0x2 | 0x8 },
 119    { OP_XOR,    0x0, 0x0, 0x3, 0x0, 0x2, 0x2 | 0x8 },
 120    { OP_SHL,    0x0, 0x0, 0x0, 0x0, 0x2, 0x2 },
 121    { OP_SHR,    0x0, 0x0, 0x0, 0x0, 0x2, 0x2 },
 122    { OP_SET,    0x3, 0x3, 0x0, 0x0, 0x2, 0x2 },
 123    { OP_SLCT,   0x4, 0x0, 0x0, 0x0, 0x6, 0x2 }, // special c[] constraint
 124    { OP_PREEX2, 0x1, 0x1, 0x0, 0x0, 0x1, 0x1 },
 125    { OP_PRESIN, 0x1, 0x1, 0x0, 0x0, 0x1, 0x1 },
 126    { OP_COS,    0x1, 0x1, 0x0, 0x8, 0x0, 0x0 },
 127    { OP_SIN,    0x1, 0x1, 0x0, 0x8, 0x0, 0x0 },
 128    { OP_EX2,    0x1, 0x1, 0x0, 0x8, 0x0, 0x0 },
 129    { OP_LG2,    0x1, 0x1, 0x0, 0x8, 0x0, 0x0 },
 130    { OP_RCP,    0x1, 0x1, 0x0, 0x8, 0x0, 0x0 },
 131    { OP_RSQ,    0x1, 0x1, 0x0, 0x8, 0x0, 0x0 },
 132    { OP_DFDX,   0x1, 0x0, 0x0, 0x0, 0x0, 0x0 },
 133    { OP_DFDY,   0x1, 0x0, 0x0, 0x0, 0x0, 0x0 },
 134    { OP_CALL,   0x0, 0x0, 0x0, 0x0, 0x1, 0x0 },
 135    { OP_POPCNT, 0x0, 0x0, 0x3, 0x0, 0x2, 0x2 },
 136    { OP_INSBF,  0x0, 0x0, 0x0, 0x0, 0x6, 0x2 },
 137    { OP_EXTBF,  0x0, 0x0, 0x0, 0x0, 0x2, 0x2 },
 138    { OP_BFIND,  0x0, 0x0, 0x1, 0x0, 0x1, 0x1 },
 139    { OP_PERMT,  0x0, 0x0, 0x0, 0x0, 0x6, 0x2 },
 140    { OP_SET_AND, 0x3, 0x3, 0x0, 0x0, 0x2, 0x2 },
 141    { OP_SET_OR, 0x3, 0x3, 0x0, 0x0, 0x2, 0x2 },
 142    { OP_SET_XOR, 0x3, 0x3, 0x0, 0x0, 0x2, 0x2 },
 143    // saturate only:
 144    { OP_LINTERP, 0x0, 0x0, 0x0, 0x8, 0x0, 0x0 },
 145    { OP_PINTERP, 0x0, 0x0, 0x0, 0x8, 0x0, 0x0 },
 146    // nve4 ops:
 147    { OP_SULDB,   0x0, 0x0, 0x0, 0x0, 0x2, 0x0 },
 148    { OP_SUSTB,   0x0, 0x0, 0x0, 0x0, 0x2, 0x0 },
 149    { OP_SUSTP,   0x0, 0x0, 0x0, 0x0, 0x2, 0x0 },
 150    { OP_SUCLAMP, 0x0, 0x0, 0x0, 0x0, 0x2, 0x2 },
 151    { OP_SUBFM,   0x0, 0x0, 0x0, 0x0, 0x6, 0x2 },
 152    { OP_SUEAU,   0x0, 0x0, 0x0, 0x0, 0x6, 0x2 }
 153 };
 154
 155 void TargetNVC0::initOpInfo()
 156 {
 157    unsigned int i, j;
 158
 159    static const uint32_t commutative[(OP_LAST + 31) / 32] =
 160    {
 161       // ADD, MUL, MAD, FMA, AND, OR, XOR, MAX, MIN, SET_AND, SET_OR, SET_XOR,
 162       // SET, SELP, SLCT
 163       0x0ce0ca00, 0x0000007e, 0x00000000, 0x00000000
 164    };
 165
 166    static const uint32_t shortForm[(OP_LAST + 31) / 32] =
 167    {
 168       // ADD, MUL, MAD, FMA, AND, OR, XOR, MAX, MIN
 169       0x0ce0ca00, 0x00000000, 0x00000000, 0x00000000
 170    };
 171
 172    static const operation noDest[] =
 173    {
 174       OP_STORE, OP_WRSV, OP_EXPORT, OP_BRA, OP_CALL, OP_RET, OP_EXIT,
 175       OP_DISCARD, OP_CONT, OP_BREAK, OP_PRECONT, OP_PREBREAK, OP_PRERET,
 176       OP_JOIN, OP_JOINAT, OP_BRKPT, OP_MEMBAR, OP_EMIT, OP_RESTART,
 177       OP_QUADON, OP_QUADPOP, OP_TEXBAR, OP_SUSTB, OP_SUSTP, OP_SUREDP,
 178       OP_SUREDB, OP_BAR
 179    };
 180
 181    static const operation noPred[] =
 182    {
 183       OP_CALL, OP_PRERET, OP_QUADON, OP_QUADPOP,
 184       OP_JOINAT, OP_PREBREAK, OP_PRECONT, OP_BRKPT
 185    };
 186
 187    for (i = 0; i < DATA_FILE_COUNT; ++i)
 188       nativeFileMap[i] = (DataFile)i;
 189    nativeFileMap[FILE_ADDRESS] = FILE_GPR;
 190
 191    for (i = 0; i < OP_LAST; ++i) {
 192       opInfo[i].variants = NULL;
 193       opInfo[i].op = (operation)i;
 194       opInfo[i].srcTypes = 1 << (int)TYPE_F32;
 195       opInfo[i].dstTypes = 1 << (int)TYPE_F32;
 196       opInfo[i].immdBits = 0;
 197       opInfo[i].srcNr = operationSrcNr[i];
 198
 199       for (j = 0; j < opInfo[i].srcNr; ++j) {
 200          opInfo[i].srcMods[j] = 0;
 201          opInfo[i].srcFiles[j] = 1 << (int)FILE_GPR;
 202       }
 203       opInfo[i].dstMods = 0;
 204       opInfo[i].dstFiles = 1 << (int)FILE_GPR;
 205
 206       opInfo[i].hasDest = 1;
 207       opInfo[i].vector = (i >= OP_TEX && i <= OP_TEXCSAA);
 208       opInfo[i].commutative = (commutative[i / 32] >> (i % 32)) & 1;
 209       opInfo[i].pseudo = (i < OP_MOV);
 210       opInfo[i].predicate = !opInfo[i].pseudo;
 211       opInfo[i].flow = (i >= OP_BRA && i <= OP_JOIN);
 212       opInfo[i].minEncSize = (shortForm[i / 32] & (1 << (i % 32))) ? 4 : 8;
 213    }
 214    for (i = 0; i < sizeof(noDest) / sizeof(noDest[0]); ++i)
 215       opInfo[noDest[i]].hasDest = 0;
 216    for (i = 0; i < sizeof(noPred) / sizeof(noPred[0]); ++i)
 217       opInfo[noPred[i]].predicate = 0;
 218
 219    for (i = 0; i < sizeof(_initProps) / sizeof(_initProps[0]); ++i) {
 220       const struct opProperties *prop = &_initProps[i];
 221
 222       for (int s = 0; s < 3; ++s) {
 223          if (prop->mNeg & (1 << s))
 224             opInfo[prop->op].srcMods[s] |= NV50_IR_MOD_NEG;
 225          if (prop->mAbs & (1 << s))
 226             opInfo[prop->op].srcMods[s] |= NV50_IR_MOD_ABS;
 227          if (prop->mNot & (1 << s))
 228             opInfo[prop->op].srcMods[s] |= NV50_IR_MOD_NOT;
 229          if (prop->fConst & (1 << s))
 230             opInfo[prop->op].srcFiles[s] |= 1 << (int)FILE_MEMORY_CONST;
 231          if (prop->fImmd & (1 << s))
 232             opInfo[prop->op].srcFiles[s] |= 1 << (int)FILE_IMMEDIATE;
 233          if (prop->fImmd & 8)
 234             opInfo[prop->op].immdBits = 0xffffffff;
 235       }
 236       if (prop->mSat & 8)
 237          opInfo[prop->op].dstMods = NV50_IR_MOD_SAT;
 238    }
 239 }
 240
 241 unsigned int
 242 TargetNVC0::getFileSize(DataFile file) const
 243 {
 244    const unsigned int gprs = (chipset >= NVISA_GK20A_CHIPSET) ? 255 : 63;
 245    const unsigned int smregs = (chipset >= NVISA_GK104_CHIPSET) ? 65536 : 32768;
 246    switch (file) {
 247    case FILE_NULL:          return 0;
 248    case FILE_GPR:           return MIN2(gprs, smregs / threads);
 249    case FILE_PREDICATE:     return 7;
 250    case FILE_FLAGS:         return 1;
 251    case FILE_ADDRESS:       return 0;
 252    case FILE_IMMEDIATE:     return 0;
 253    case FILE_MEMORY_CONST:  return 65536;
 254    case FILE_SHADER_INPUT:  return 0x400;
 255    case FILE_SHADER_OUTPUT: return 0x400;
 256    case FILE_MEMORY_BUFFER: return 0xffffffff;
 257    case FILE_MEMORY_GLOBAL: return 0xffffffff;
 258    case FILE_MEMORY_SHARED: return 16 << 10;
 259    case FILE_MEMORY_LOCAL:  return 48 << 10;
 260    case FILE_SYSTEM_VALUE:  return 32;
 261    default:
 262       assert(!"invalid file");
 263       return 0;
 264    }
 265 }
 266
 267 unsigned int
 268 TargetNVC0::getFileUnit(DataFile file) const
 269 {
 270    if (file == FILE_GPR || file == FILE_ADDRESS || file == FILE_SYSTEM_VALUE)
 271       return 2;
 272    return 0;
 273 }
 274
 275 uint32_t
 276 TargetNVC0::getSVAddress(DataFile shaderFile, const Symbol *sym) const
 277 {
 278    const int idx = sym->reg.data.sv.index;
 279    const SVSemantic sv = sym->reg.data.sv.sv;
 280
 281    const bool isInput = shaderFile == FILE_SHADER_INPUT;
 282    const bool kepler = getChipset() >= NVISA_GK104_CHIPSET;
 283
 284    switch (sv) {
 285    case SV_POSITION:       return 0x070 + idx * 4;
 286    case SV_INSTANCE_ID:    return 0x2f8;
 287    case SV_VERTEX_ID:      return 0x2fc;
 288    case SV_PRIMITIVE_ID:   return isInput ? 0x060 : 0x040;
 289    case SV_LAYER:          return 0x064;
 290    case SV_VIEWPORT_INDEX: return 0x068;
 291    case SV_POINT_SIZE:     return 0x06c;
 292    case SV_CLIP_DISTANCE:  return 0x2c0 + idx * 4;
 293    case SV_POINT_COORD:    return 0x2e0 + idx * 4;
 294    case SV_FACE:           return 0x3fc;
 295    case SV_TESS_OUTER:     return 0x000 + idx * 4;
 296    case SV_TESS_INNER:     return 0x010 + idx * 4;
 297    case SV_TESS_COORD:     return 0x2f0 + idx * 4;
 298    case SV_NTID:           return kepler ? (0x00 + idx * 4) : ~0;
 299    case SV_NCTAID:         return kepler ? (0x0c + idx * 4) : ~0;
 300    case SV_GRIDID:         return kepler ? 0x18 : ~0;
 301    case SV_WORK_DIM:       return 0x1c;
 302    case SV_SAMPLE_INDEX:   return 0;
 303    case SV_SAMPLE_POS:     return 0;
 304    case SV_SAMPLE_MASK:    return 0;
 305    case SV_BASEVERTEX:     return 0;
 306    case SV_BASEINSTANCE:   return 0;
 307    case SV_DRAWID:         return 0;
 308    default:
 309       return 0xffffffff;
 310    }
 311 }
 312
 313 bool
 314 TargetNVC0::insnCanLoad(const Instruction *i, int s,
 315                         const Instruction *ld) const
 316 {
 317    DataFile sf = ld->src(0).getFile();
 318
 319    // immediate 0 can be represented by GPR $r63/$r255
 320    if (sf == FILE_IMMEDIATE && ld->getSrc(0)->reg.data.u64 == 0)
 321       return (!i->isPseudo() &&
 322               !i->asTex() &&
 323               i->op != OP_EXPORT && i->op != OP_STORE);
 324
 325    if (s >= opInfo[i->op].srcNr)
 326       return false;
 327    if (!(opInfo[i->op].srcFiles[s] & (1 << (int)sf)))
 328       return false;
 329
 330    // indirect loads can only be done by OP_LOAD/VFETCH/INTERP on nvc0
 331    if (ld->src(0).isIndirect(0))
 332       return false;
 333    // these are implemented using shf.r and shf.l which can't load consts
 334    if ((i->op == OP_SHL || i->op == OP_SHR) && typeSizeof(i->sType) == 8 &&
 335        sf == FILE_MEMORY_CONST)
 336       return false;
 337
 338    for (int k = 0; i->srcExists(k); ++k) {
 339       if (i->src(k).getFile() == FILE_IMMEDIATE) {
 340          if (k == 2 && i->op == OP_SUCLAMP) // special case
 341             continue;
 342          if (k == 1 && i->op == OP_SHLADD) // special case
 343             continue;
 344          if (i->getSrc(k)->reg.data.u64 != 0)
 345             return false;
 346       } else
 347       if (i->src(k).getFile() != FILE_GPR &&
 348           i->src(k).getFile() != FILE_PREDICATE &&
 349           i->src(k).getFile() != FILE_FLAGS) {
 350          return false;
 351       }
 352    }
 353
 354    // not all instructions support full 32 bit immediates
 355    if (sf == FILE_IMMEDIATE) {
 356       Storage &reg = ld->getSrc(0)->asImm()->reg;
 357
 358       if (opInfo[i->op].immdBits != 0xffffffff || typeSizeof(i->sType) > 4) {
 359          switch (i->sType) {
 360          case TYPE_F64:
 361             if (reg.data.u64 & 0x00000fffffffffffULL)
 362                return false;
 363             break;
 364          case TYPE_F32:
 365             if (reg.data.u32 & 0xfff)
 366                return false;
 367             break;
 368          case TYPE_S32:
 369          case TYPE_U32:
 370             // with u32, 0xfffff counts as 0xffffffff as well
 371             if (reg.data.s32 > 0x7ffff || reg.data.s32 < -0x80000)
 372                return false;
 373             break;
 374          case TYPE_U8:
 375          case TYPE_S8:
 376          case TYPE_U16:
 377          case TYPE_S16:
 378          case TYPE_F16:
 379             break;
 380          default:
 381             return false;
 382          }
 383       } else
 384       if (i->op == OP_ADD && i->sType == TYPE_F32) {
 385          // add f32 LIMM cannot saturate
 386          if (i->saturate && (reg.data.u32 & 0xfff))
 387             return false;
 388       }
 389    }
 390
 391    return true;
 392 }
 393
 394 bool
 395 TargetNVC0::insnCanLoadOffset(const Instruction *insn, int s, int offset) const
 396 {
 397    const ValueRef& ref = insn->src(s);
 398    if (ref.getFile() == FILE_MEMORY_CONST &&
 399        (insn->op != OP_LOAD || insn->subOp != NV50_IR_SUBOP_LDC_IS))
 400       return offset >= -0x8000 && offset < 0x8000;
 401    return true;
 402 }
 403
 404 bool
 405 TargetNVC0::isAccessSupported(DataFile file, DataType ty) const
 406 {
 407    if (ty == TYPE_NONE)
 408       return false;
 409    if (file == FILE_MEMORY_CONST) {
 410       if (getChipset() >= NVISA_GM107_CHIPSET)
 411          return typeSizeof(ty) <= 4;
 412       else
 413       if (getChipset() >= NVISA_GK104_CHIPSET) // wrong encoding ?
 414          return typeSizeof(ty) <= 8;
 415    }
 416    if (ty == TYPE_B96)
 417       return false;
 418    return true;
 419 }
 420
 421 bool
 422 TargetNVC0::isOpSupported(operation op, DataType ty) const
 423 {
 424    if (op == OP_SAD && ty != TYPE_S32 && ty != TYPE_U32)
 425       return false;
 426    if (op == OP_POW || op == OP_SQRT || op == OP_DIV || op == OP_MOD)
 427       return false;
 428    return true;
 429 }
 430
 431 bool
 432 TargetNVC0::isModSupported(const Instruction *insn, int s, Modifier mod) const
 433 {
 434    if (!isFloatType(insn->dType)) {
 435       switch (insn->op) {
 436       case OP_ABS:
 437       case OP_NEG:
 438       case OP_CVT:
 439       case OP_CEIL:
 440       case OP_FLOOR:
 441       case OP_TRUNC:
 442       case OP_AND:
 443       case OP_OR:
 444       case OP_XOR:
 445       case OP_POPCNT:
 446       case OP_BFIND:
 447          break;
 448       case OP_SET:
 449          if (insn->sType != TYPE_F32)
 450             return false;
 451          break;
 452       case OP_ADD:
 453          if (mod.abs())
 454             return false;
 455          if (insn->src(s ? 0 : 1).mod.neg())
 456             return false;
 457          break;
 458       case OP_SUB:
 459          if (s == 0)
 460             return insn->src(1).mod.neg() ? false : true;
 461          break;
 462       case OP_SHLADD:
 463          if (s == 1)
 464             return false;
 465          if (insn->src(s ? 0 : 2).mod.neg())
 466             return false;
 467          break;
 468       default:
 469          return false;
 470       }
 471    }
 472    if (s >= opInfo[insn->op].srcNr || s >= 3)
 473       return false;
 474    return (mod & Modifier(opInfo[insn->op].srcMods[s])) == mod;
 475 }
 476
 477 bool
 478 TargetNVC0::mayPredicate(const Instruction *insn, const Value *pred) const
 479 {
 480    if (insn->getPredicate())
 481       return false;
 482    return opInfo[insn->op].predicate;
 483 }
 484
 485 bool
 486 TargetNVC0::isSatSupported(const Instruction *insn) const
 487 {
 488    if (insn->op == OP_CVT)
 489       return true;
 490    if (!(opInfo[insn->op].dstMods & NV50_IR_MOD_SAT))
 491       return false;
 492
 493    if (insn->dType == TYPE_U32)
 494       return (insn->op == OP_ADD) || (insn->op == OP_MAD);
 495
 496    // add f32 LIMM cannot saturate
 497    if (insn->op == OP_ADD && insn->sType == TYPE_F32) {
 498       if (insn->getSrc(1)->asImm() &&
 499           insn->getSrc(1)->reg.data.u32 & 0xfff)
 500          return false;
 501    }
 502
 503    return insn->dType == TYPE_F32;
 504 }
 505
 506 bool
 507 TargetNVC0::isPostMultiplySupported(operation op, float f, int& e) const
 508 {
 509    if (op != OP_MUL)
 510       return false;
 511    f = fabsf(f);
 512    e = static_cast<int>(log2f(f));
 513    if (e < -3 || e > 3)
 514       return false;
 515    return f == exp2f(static_cast<float>(e));
 516 }
 517
 518 // TODO: better values
 519 // this could be more precise, e.g. depending on the issue-to-read/write delay
 520 // of the depending instruction, but it's good enough
 521 int TargetNVC0::getLatency(const Instruction *i) const
 522 {
 523    if (chipset >= 0xe4) {
 524       if (i->dType == TYPE_F64 || i->sType == TYPE_F64)
 525          return 20;
 526       switch (i->op) {
 527       case OP_LINTERP:
 528       case OP_PINTERP:
 529          return 15;
 530       case OP_LOAD:
 531          if (i->src(0).getFile() == FILE_MEMORY_CONST)
 532             return 9;
 533          // fall through
 534       case OP_VFETCH:
 535          return 24;
 536       default:
 537          if (Target::getOpClass(i->op) == OPCLASS_TEXTURE)
 538             return 17;
 539          if (i->op == OP_MUL && i->dType != TYPE_F32)
 540             return 15;
 541          return 9;
 542       }
 543    } else {
 544       if (i->op == OP_LOAD) {
 545          if (i->cache == CACHE_CV)
 546             return 700;
 547          return 48;
 548       }
 549       return 24;
 550    }
 551    return 32;
 552 }
 553
 554 // These are "inverse" throughput values, i.e. the number of cycles required
 555 // to issue a specific instruction for a full warp (32 threads).
 556 //
 557 // Assuming we have more than 1 warp in flight, a higher issue latency results
 558 // in a lower result latency since the MP will have spent more time with other
 559 // warps.
 560 // This also helps to determine the number of cycles between instructions in
 561 // a single warp.
 562 //
 563 int TargetNVC0::getThroughput(const Instruction *i) const
 564 {
 565    // TODO: better values
 566    if (i->dType == TYPE_F32) {
 567       switch (i->op) {
 568       case OP_ADD:
 569       case OP_MUL:
 570       case OP_MAD:
 571       case OP_FMA:
 572          return 1;
 573       case OP_CVT:
 574       case OP_CEIL:
 575       case OP_FLOOR:
 576       case OP_TRUNC:
 577       case OP_SET:
 578       case OP_SLCT:
 579       case OP_MIN:
 580       case OP_MAX:
 581          return 2;
 582       case OP_RCP:
 583       case OP_RSQ:
 584       case OP_LG2:
 585       case OP_SIN:
 586       case OP_COS:
 587       case OP_PRESIN:
 588       case OP_PREEX2:
 589       default:
 590          return 8;
 591       }
 592    } else
 593    if (i->dType == TYPE_U32 || i->dType == TYPE_S32) {
 594       switch (i->op) {
 595       case OP_ADD:
 596       case OP_AND:
 597       case OP_OR:
 598       case OP_XOR:
 599       case OP_NOT:
 600          return 1;
 601       case OP_MUL:
 602       case OP_MAD:
 603       case OP_CVT:
 604       case OP_SET:
 605       case OP_SLCT:
 606       case OP_SHL:
 607       case OP_SHR:
 608       case OP_NEG:
 609       case OP_ABS:
 610       case OP_MIN:
 611       case OP_MAX:
 612       default:
 613          return 2;
 614       }
 615    } else
 616    if (i->dType == TYPE_F64) {
 617       return 2;
 618    } else {
 619       return 1;
 620    }
 621 }
 622
 623 bool TargetNVC0::canDualIssue(const Instruction *a, const Instruction *b) const
 624 {
 625    const OpClass clA = operationClass[a->op];
 626    const OpClass clB = operationClass[b->op];
 627
 628    if (getChipset() >= 0xe4) {
 629       // not texturing
 630       // not if the 2nd instruction isn't necessarily executed
 631       if (clA == OPCLASS_TEXTURE || clA == OPCLASS_FLOW)
 632          return false;
 633
 634       // Check that a and b don't write to the same sources, nor that b reads
 635       // anything that a writes.
 636       if (!a->canCommuteDefDef(b) || !a->canCommuteDefSrc(b))
 637          return false;
 638
 639       // anything with MOV
 640       if (a->op == OP_MOV || b->op == OP_MOV)
 641          return true;
 642       if (clA == clB) {
 643          switch (clA) {
 644          // there might be more
 645          case OPCLASS_COMPARE:
 646             if ((a->op == OP_MIN || a->op == OP_MAX) &&
 647                 (b->op == OP_MIN || b->op == OP_MAX))
 648                break;
 649             return false;
 650          case OPCLASS_ARITH:
 651             break;
 652          default:
 653             return false;
 654          }
 655          // only F32 arith or integer additions
 656          return (a->dType == TYPE_F32 || a->op == OP_ADD ||
 657                  b->dType == TYPE_F32 || b->op == OP_ADD);
 658       }
 659       // nothing with TEXBAR
 660       if (a->op == OP_TEXBAR || b->op == OP_TEXBAR)
 661          return false;
 662       // no loads and stores accessing the same space
 663       if ((clA == OPCLASS_LOAD && clB == OPCLASS_STORE) ||
 664           (clB == OPCLASS_LOAD && clA == OPCLASS_STORE))
 665          if (a->src(0).getFile() == b->src(0).getFile())
 666             return false;
 667       // no > 32-bit ops
 668       if (typeSizeof(a->dType) > 4 || typeSizeof(b->dType) > 4 ||
 669           typeSizeof(a->sType) > 4 || typeSizeof(b->sType) > 4)
 670          return false;
 671       return true;
 672    } else {
 673       return false; // info not needed (yet)
 674    }
 675 }
 676
 677 } // namespace nv50_ir