src/gallium/drivers/nouveau/codegen/nv50_ir_target_nv50.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_nv50.h"
  24
  25 namespace nv50_ir {
  26
  27 Target *getTargetNV50(unsigned int chipset)
  28 {
  29    return new TargetNV50(chipset);
  30 }
  31
  32 TargetNV50::TargetNV50(unsigned int card) : Target(true, true, false)
  33 {
  34    chipset = card;
  35
  36    wposMask = 0;
  37    for (unsigned int i = 0; i <= SV_LAST; ++i)
  38       sysvalLocation[i] = ~0;
  39
  40    initOpInfo();
  41 }
  42
  43 #if 0
  44 // BULTINS / LIBRARY FUNCTIONS:
  45
  46 // TODO
  47 static const uint32_t nvc0_builtin_code[] =
  48 {
  49 };
  50
  51 static const uint16_t nvc0_builtin_offsets[NV50_BUILTIN_COUNT] =
  52 {
  53 };
  54 #endif
  55
  56 void
  57 TargetNV50::getBuiltinCode(const uint32_t **code, uint32_t *size) const
  58 {
  59    *code = NULL;
  60    *size = 0;
  61 }
  62
  63 uint32_t
  64 TargetNV50::getBuiltinOffset(int builtin) const
  65 {
  66    return 0;
  67 }
  68
  69 struct opProperties
  70 {
  71    operation op;
  72    unsigned int mNeg    : 4;
  73    unsigned int mAbs    : 4;
  74    unsigned int mNot    : 4;
  75    unsigned int mSat    : 4;
  76    unsigned int fConst  : 3;
  77    unsigned int fShared : 3;
  78    unsigned int fAttrib : 3;
  79    unsigned int fImm    : 3;
  80 };
  81
  82 static const struct opProperties _initProps[] =
  83 {
  84    //           neg  abs  not  sat  c[]  s[], a[], imm
  85    { OP_ADD,    0x3, 0x0, 0x0, 0x8, 0x2, 0x1, 0x1, 0x2 },
  86    { OP_SUB,    0x3, 0x0, 0x0, 0x8, 0x2, 0x1, 0x1, 0x2 },
  87    { OP_MUL,    0x3, 0x0, 0x0, 0x0, 0x2, 0x1, 0x1, 0x2 },
  88    { OP_MAX,    0x3, 0x3, 0x0, 0x0, 0x2, 0x1, 0x1, 0x0 },
  89    { OP_MIN,    0x3, 0x3, 0x0, 0x0, 0x2, 0x1, 0x1, 0x0 },
  90    { OP_MAD,    0x7, 0x0, 0x0, 0x8, 0x6, 0x1, 0x1, 0x0 }, // special constraint
  91    { OP_ABS,    0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x1, 0x0 },
  92    { OP_NEG,    0x0, 0x1, 0x0, 0x0, 0x0, 0x1, 0x1, 0x0 },
  93    { OP_CVT,    0x1, 0x1, 0x0, 0x8, 0x0, 0x1, 0x1, 0x0 },
  94    { OP_AND,    0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x2 },
  95    { OP_OR,     0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x2 },
  96    { OP_XOR,    0x0, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x2 },
  97    { OP_SHL,    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2 },
  98    { OP_SHR,    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2 },
  99    { OP_SET,    0x3, 0x3, 0x0, 0x0, 0x2, 0x1, 0x1, 0x0 },
 100    { OP_PREEX2, 0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 101    { OP_PRESIN, 0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 102    { OP_EX2,    0x0, 0x0, 0x0, 0x8, 0x0, 0x0, 0x0, 0x0 },
 103    { OP_LG2,    0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 104    { OP_RCP,    0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 105    { OP_RSQ,    0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 106    { OP_DFDX,   0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 107    { OP_DFDY,   0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 },
 108 };
 109
 110 void TargetNV50::initOpInfo()
 111 {
 112    unsigned int i, j;
 113
 114    static const uint32_t commutative[(OP_LAST + 31) / 32] =
 115    {
 116       // ADD,MAD,MUL,AND,OR,XOR,MAX,MIN
 117       0x0670ca00, 0x0000003f, 0x00000000, 0x00000000
 118    };
 119    static const uint32_t shortForm[(OP_LAST + 31) / 32] =
 120    {
 121       // MOV,ADD,SUB,MUL,MAD,SAD,L/PINTERP,RCP,TEX,TXF
 122       0x00014e40, 0x00000040, 0x00000930, 0x00000000
 123    };
 124    static const operation noDestList[] =
 125    {
 126       OP_STORE, OP_WRSV, OP_EXPORT, OP_BRA, OP_CALL, OP_RET, OP_EXIT,
 127       OP_DISCARD, OP_CONT, OP_BREAK, OP_PRECONT, OP_PREBREAK, OP_PRERET,
 128       OP_JOIN, OP_JOINAT, OP_BRKPT, OP_MEMBAR, OP_EMIT, OP_RESTART,
 129       OP_QUADON, OP_QUADPOP, OP_TEXBAR, OP_SUSTB, OP_SUSTP, OP_SUREDP,
 130       OP_SUREDB, OP_BAR
 131    };
 132    static const operation noPredList[] =
 133    {
 134       OP_CALL, OP_PREBREAK, OP_PRERET, OP_QUADON, OP_QUADPOP, OP_JOINAT,
 135       OP_EMIT, OP_RESTART
 136    };
 137
 138    for (i = 0; i < DATA_FILE_COUNT; ++i)
 139       nativeFileMap[i] = (DataFile)i;
 140    nativeFileMap[FILE_PREDICATE] = FILE_FLAGS;
 141
 142    for (i = 0; i < OP_LAST; ++i) {
 143       opInfo[i].variants = NULL;
 144       opInfo[i].op = (operation)i;
 145       opInfo[i].srcTypes = 1 << (int)TYPE_F32;
 146       opInfo[i].dstTypes = 1 << (int)TYPE_F32;
 147       opInfo[i].immdBits = 0xffffffff;
 148       opInfo[i].srcNr = operationSrcNr[i];
 149
 150       for (j = 0; j < opInfo[i].srcNr; ++j) {
 151          opInfo[i].srcMods[j] = 0;
 152          opInfo[i].srcFiles[j] = 1 << (int)FILE_GPR;
 153       }
 154       opInfo[i].dstMods = 0;
 155       opInfo[i].dstFiles = 1 << (int)FILE_GPR;
 156
 157       opInfo[i].hasDest = 1;
 158       opInfo[i].vector = (i >= OP_TEX && i <= OP_TEXCSAA);
 159       opInfo[i].commutative = (commutative[i / 32] >> (i % 32)) & 1;
 160       opInfo[i].pseudo = (i < OP_MOV);
 161       opInfo[i].predicate = !opInfo[i].pseudo;
 162       opInfo[i].flow = (i >= OP_BRA && i <= OP_JOIN);
 163       opInfo[i].minEncSize = (shortForm[i / 32] & (1 << (i % 32))) ? 4 : 8;
 164    }
 165    for (i = 0; i < sizeof(noDestList) / sizeof(noDestList[0]); ++i)
 166       opInfo[noDestList[i]].hasDest = 0;
 167    for (i = 0; i < sizeof(noPredList) / sizeof(noPredList[0]); ++i)
 168       opInfo[noPredList[i]].predicate = 0;
 169
 170    for (i = 0; i < sizeof(_initProps) / sizeof(_initProps[0]); ++i) {
 171       const struct opProperties *prop = &_initProps[i];
 172
 173       for (int s = 0; s < 3; ++s) {
 174          if (prop->mNeg & (1 << s))
 175             opInfo[prop->op].srcMods[s] |= NV50_IR_MOD_NEG;
 176          if (prop->mAbs & (1 << s))
 177             opInfo[prop->op].srcMods[s] |= NV50_IR_MOD_ABS;
 178          if (prop->mNot & (1 << s))
 179             opInfo[prop->op].srcMods[s] |= NV50_IR_MOD_NOT;
 180          if (prop->fConst & (1 << s))
 181             opInfo[prop->op].srcFiles[s] |= 1 << (int)FILE_MEMORY_CONST;
 182          if (prop->fShared & (1 << s))
 183             opInfo[prop->op].srcFiles[s] |= 1 << (int)FILE_MEMORY_SHARED;
 184          if (prop->fAttrib & (1 << s))
 185             opInfo[prop->op].srcFiles[s] |= 1 << (int)FILE_SHADER_INPUT;
 186          if (prop->fImm & (1 << s))
 187             opInfo[prop->op].srcFiles[s] |= 1 << (int)FILE_IMMEDIATE;
 188       }
 189       if (prop->mSat & 8)
 190          opInfo[prop->op].dstMods = NV50_IR_MOD_SAT;
 191    }
 192
 193    if (chipset >= 0xa0)
 194       opInfo[OP_MUL].dstMods = NV50_IR_MOD_SAT;
 195 }
 196
 197 unsigned int
 198 TargetNV50::getFileSize(DataFile file) const
 199 {
 200    switch (file) {
 201    case FILE_NULL:          return 0;
 202    case FILE_GPR:           return 256; // in 16-bit units **
 203    case FILE_PREDICATE:     return 0;
 204    case FILE_FLAGS:         return 4;
 205    case FILE_ADDRESS:       return 4;
 206    case FILE_IMMEDIATE:     return 0;
 207    case FILE_MEMORY_CONST:  return 65536;
 208    case FILE_SHADER_INPUT:  return 0x200;
 209    case FILE_SHADER_OUTPUT: return 0x200;
 210    case FILE_MEMORY_GLOBAL: return 0xffffffff;
 211    case FILE_MEMORY_SHARED: return 16 << 10;
 212    case FILE_MEMORY_LOCAL:  return 48 << 10;
 213    case FILE_SYSTEM_VALUE:  return 16;
 214    default:
 215       assert(!"invalid file");
 216       return 0;
 217    }
 218    // ** only first 128 units encodable for 16-bit regs
 219 }
 220
 221 unsigned int
 222 TargetNV50::getFileUnit(DataFile file) const
 223 {
 224    if (file == FILE_GPR || file == FILE_ADDRESS)
 225       return 1;
 226    if (file == FILE_SYSTEM_VALUE)
 227       return 2;
 228    return 0;
 229 }
 230
 231 uint32_t
 232 TargetNV50::getSVAddress(DataFile shaderFile, const Symbol *sym) const
 233 {
 234    switch (sym->reg.data.sv.sv) {
 235    case SV_FACE:
 236       return 0x3fc;
 237    case SV_POSITION:
 238    {
 239       uint32_t addr = sysvalLocation[sym->reg.data.sv.sv];
 240       for (int c = 0; c < sym->reg.data.sv.index; ++c)
 241          if (wposMask & (1 << c))
 242             addr += 4;
 243       return addr;
 244    }
 245    case SV_PRIMITIVE_ID:
 246       return shaderFile == FILE_SHADER_INPUT ? 0x18 :
 247          sysvalLocation[sym->reg.data.sv.sv];
 248    case SV_NCTAID:
 249       return 0x8 + 2 * sym->reg.data.sv.index;
 250    case SV_CTAID:
 251       return 0xc + 2 * sym->reg.data.sv.index;
 252    case SV_NTID:
 253       return 0x2 + 2 * sym->reg.data.sv.index;
 254    case SV_TID:
 255       return 0;
 256    case SV_SAMPLE_POS:
 257       return 0; /* sample position is handled differently */
 258    default:
 259       return sysvalLocation[sym->reg.data.sv.sv];
 260    }
 261 }
 262
 263 // long:  rrr, arr, rcr, acr, rrc, arc, gcr, grr
 264 // short: rr, ar, rc, gr
 265 // immd:  ri, gi
 266 bool
 267 TargetNV50::insnCanLoad(const Instruction *i, int s,
 268                         const Instruction *ld) const
 269 {
 270    DataFile sf = ld->src(0).getFile();
 271
 272    // immediate 0 can be represented by GPR $r63/$r127
 273    if (sf == FILE_IMMEDIATE && ld->getSrc(0)->reg.data.u64 == 0)
 274       return (!i->isPseudo() &&
 275               !i->asTex() &&
 276               i->op != OP_EXPORT && i->op != OP_STORE);
 277
 278    if (sf == FILE_IMMEDIATE && (i->predSrc >= 0 || i->flagsDef >= 0))
 279       return false;
 280    if (s >= opInfo[i->op].srcNr)
 281       return false;
 282    if (!(opInfo[i->op].srcFiles[s] & (1 << (int)sf)))
 283       return false;
 284    if (s == 2 && i->src(1).getFile() != FILE_GPR)
 285       return false;
 286
 287    // NOTE: don't rely on flagsDef
 288    if (sf == FILE_IMMEDIATE)
 289       for (int d = 0; i->defExists(d); ++d)
 290          if (i->def(d).getFile() == FILE_FLAGS)
 291             return false;
 292
 293    unsigned mode = 0;
 294
 295    for (int z = 0; z < Target::operationSrcNr[i->op]; ++z) {
 296       DataFile zf = (z == s) ? sf : i->src(z).getFile();
 297       switch (zf) {
 298       case FILE_GPR:
 299          break;
 300       case FILE_MEMORY_SHARED:
 301       case FILE_SHADER_INPUT:
 302          mode |= 1 << (z * 2);
 303          break;
 304       case FILE_MEMORY_CONST:
 305          mode |= 2 << (z * 2);
 306          break;
 307       case FILE_IMMEDIATE:
 308          mode |= 3 << (z * 2);
 309       default:
 310          break;
 311       }
 312    }
 313
 314    switch (mode) {
 315    case 0x00:
 316    case 0x01:
 317    case 0x03:
 318    case 0x08:
 319    case 0x0c:
 320    case 0x20:
 321    case 0x21:
 322       break;
 323    case 0x09:
 324       // Shader inputs get transformed to p[] in geometry shaders, and those
 325       // aren't allowed to be used at the same time as c[].
 326       if (ld->bb->getProgram()->getType() == Program::TYPE_GEOMETRY)
 327          return false;
 328       break;
 329    case 0x0d:
 330       if (ld->bb->getProgram()->getType() != Program::TYPE_GEOMETRY)
 331          return false;
 332       break;
 333    default:
 334       return false;
 335    }
 336
 337    uint8_t ldSize;
 338
 339    if ((i->op == OP_MUL || i->op == OP_MAD) && !isFloatType(i->dType)) {
 340       // 32-bit MUL will be split into 16-bit MULs
 341       if (ld->src(0).isIndirect(0))
 342          return false;
 343       if (sf == FILE_IMMEDIATE)
 344          return false;
 345       if (i->subOp == NV50_IR_SUBOP_MUL_HIGH && sf == FILE_MEMORY_CONST)
 346          return false;
 347       ldSize = 2;
 348    } else {
 349       ldSize = typeSizeof(ld->dType);
 350    }
 351
 352    if (sf == FILE_IMMEDIATE)
 353       return ldSize <= 4;
 354
 355
 356    // Check if memory access is encodable:
 357
 358    if (ldSize < 4 && sf == FILE_SHADER_INPUT) // no < 4-byte aligned a[] access
 359       return false;
 360    if (ld->getSrc(0)->reg.data.offset > (int32_t)(127 * ldSize))
 361       return false;
 362
 363    if (ld->src(0).isIndirect(0)) {
 364       for (int z = 0; i->srcExists(z); ++z)
 365          if (i->src(z).isIndirect(0))
 366             return false;
 367
 368       // s[] access only possible in CP, $aX always applies
 369       if (sf == FILE_MEMORY_SHARED)
 370          return true;
 371       if (!ld->bb) // can't check type ...
 372          return false;
 373       Program::Type pt = ld->bb->getProgram()->getType();
 374
 375       // $aX applies to c[] only in VP, FP, GP if p[] is not accessed
 376       if (pt == Program::TYPE_COMPUTE)
 377          return false;
 378       if (pt == Program::TYPE_GEOMETRY) {
 379          if (sf == FILE_MEMORY_CONST)
 380             return i->src(s).getFile() != FILE_SHADER_INPUT;
 381          return sf == FILE_SHADER_INPUT;
 382       }
 383       return sf == FILE_MEMORY_CONST;
 384    }
 385    return true;
 386 }
 387
 388 bool
 389 TargetNV50::insnCanLoadOffset(const Instruction *i, int s, int offset) const
 390 {
 391    if (!i->src(s).isIndirect(0))
 392       return true;
 393    offset += i->src(s).get()->reg.data.offset;
 394    if (i->op == OP_LOAD || i->op == OP_STORE) {
 395       // There are some restrictions in theory, but in practice they're never
 396       // going to be hit. When we enable shared/global memory, this will
 397       // become more important.
 398       return true;
 399    }
 400    return offset >= 0 && offset <= (int32_t)(127 * i->src(s).get()->reg.size);
 401 }
 402
 403 bool
 404 TargetNV50::isAccessSupported(DataFile file, DataType ty) const
 405 {
 406    if (ty == TYPE_B96 || ty == TYPE_NONE)
 407       return false;
 408    if (typeSizeof(ty) > 4)
 409       return (file == FILE_MEMORY_LOCAL) || (file == FILE_MEMORY_GLOBAL);
 410    return true;
 411 }
 412
 413 bool
 414 TargetNV50::isOpSupported(operation op, DataType ty) const
 415 {
 416    if (ty == TYPE_F64 && chipset < 0xa0)
 417       return false;
 418
 419    switch (op) {
 420    case OP_PRERET:
 421       return chipset >= 0xa0;
 422    case OP_TXG:
 423       return chipset >= 0xa3 && chipset != 0xaa && chipset != 0xac;
 424    case OP_POW:
 425    case OP_SQRT:
 426    case OP_DIV:
 427    case OP_MOD:
 428    case OP_SET_AND:
 429    case OP_SET_OR:
 430    case OP_SET_XOR:
 431    case OP_SLCT:
 432    case OP_SELP:
 433    case OP_POPCNT:
 434    case OP_INSBF:
 435    case OP_EXTBF:
 436    case OP_EXIT: // want exit modifier instead (on NOP if required)
 437    case OP_MEMBAR:
 438       return false;
 439    case OP_SAD:
 440       return ty == TYPE_S32;
 441    case OP_SET:
 442       return !isFloatType(ty);
 443    default:
 444       return true;
 445    }
 446 }
 447
 448 bool
 449 TargetNV50::isModSupported(const Instruction *insn, int s, Modifier mod) const
 450 {
 451    if (!isFloatType(insn->dType)) {
 452       switch (insn->op) {
 453       case OP_ABS:
 454       case OP_NEG:
 455       case OP_CVT:
 456       case OP_CEIL:
 457       case OP_FLOOR:
 458       case OP_TRUNC:
 459       case OP_AND:
 460       case OP_OR:
 461       case OP_XOR:
 462          break;
 463       case OP_ADD:
 464          if (insn->src(s ? 0 : 1).mod.neg())
 465             return false;
 466          break;
 467       case OP_SUB:
 468          if (s == 0)
 469             return insn->src(1).mod.neg() ? false : true;
 470          break;
 471       case OP_SET:
 472          if (insn->sType != TYPE_F32)
 473             return false;
 474          break;
 475       default:
 476          return false;
 477       }
 478    }
 479    if (s >= opInfo[insn->op].srcNr || s >= 3)
 480       return false;
 481    return (mod & Modifier(opInfo[insn->op].srcMods[s])) == mod;
 482 }
 483
 484 bool
 485 TargetNV50::mayPredicate(const Instruction *insn, const Value *pred) const
 486 {
 487    if (insn->getPredicate() || insn->flagsSrc >= 0)
 488       return false;
 489    for (int s = 0; insn->srcExists(s); ++s)
 490       if (insn->src(s).getFile() == FILE_IMMEDIATE)
 491          return false;
 492    return opInfo[insn->op].predicate;
 493 }
 494
 495 bool
 496 TargetNV50::isSatSupported(const Instruction *insn) const
 497 {
 498    if (insn->op == OP_CVT)
 499       return true;
 500    if (insn->dType != TYPE_F32)
 501       return false;
 502    return opInfo[insn->op].dstMods & NV50_IR_MOD_SAT;
 503 }
 504
 505 int TargetNV50::getLatency(const Instruction *i) const
 506 {
 507    // TODO: tune these values
 508    if (i->op == OP_LOAD) {
 509       switch (i->src(0).getFile()) {
 510       case FILE_MEMORY_LOCAL:
 511       case FILE_MEMORY_GLOBAL:
 512          return 100; // really 400 to 800
 513       default:
 514          return 22;
 515       }
 516    }
 517    return 22;
 518 }
 519
 520 // These are "inverse" throughput values, i.e. the number of cycles required
 521 // to issue a specific instruction for a full warp (32 threads).
 522 //
 523 // Assuming we have more than 1 warp in flight, a higher issue latency results
 524 // in a lower result latency since the MP will have spent more time with other
 525 // warps.
 526 // This also helps to determine the number of cycles between instructions in
 527 // a single warp.
 528 //
 529 int TargetNV50::getThroughput(const Instruction *i) const
 530 {
 531    // TODO: tune these values
 532    if (i->dType == TYPE_F32) {
 533       switch (i->op) {
 534       case OP_RCP:
 535       case OP_RSQ:
 536       case OP_LG2:
 537       case OP_SIN:
 538       case OP_COS:
 539       case OP_PRESIN:
 540       case OP_PREEX2:
 541          return 16;
 542       default:
 543          return 4;
 544       }
 545    } else
 546    if (i->dType == TYPE_U32 || i->dType == TYPE_S32) {
 547       return 4;
 548    } else
 549    if (i->dType == TYPE_F64) {
 550       return 32;
 551    } else {
 552       return 1;
 553    }
 554 }
 555
 556 static void
 557 recordLocation(uint16_t *locs, uint8_t *masks,
 558                const struct nv50_ir_varying *var)
 559 {
 560    uint16_t addr = var->slot[0] * 4;
 561
 562    switch (var->sn) {
 563    case TGSI_SEMANTIC_POSITION: locs[SV_POSITION] = addr; break;
 564    case TGSI_SEMANTIC_INSTANCEID: locs[SV_INSTANCE_ID] = addr; break;
 565    case TGSI_SEMANTIC_VERTEXID: locs[SV_VERTEX_ID] = addr; break;
 566    case TGSI_SEMANTIC_PRIMID: locs[SV_PRIMITIVE_ID] = addr; break;
 567    case TGSI_SEMANTIC_LAYER: locs[SV_LAYER] = addr; break;
 568    case TGSI_SEMANTIC_VIEWPORT_INDEX: locs[SV_VIEWPORT_INDEX] = addr; break;
 569    default:
 570       break;
 571    }
 572    if (var->sn == TGSI_SEMANTIC_POSITION && masks)
 573       masks[0] = var->mask;
 574 }
 575
 576 void
 577 TargetNV50::parseDriverInfo(const struct nv50_ir_prog_info *info)
 578 {
 579    unsigned int i;
 580    for (i = 0; i < info->numOutputs; ++i)
 581       recordLocation(sysvalLocation, NULL, &info->out[i]);
 582    for (i = 0; i < info->numInputs; ++i)
 583       recordLocation(sysvalLocation, &wposMask, &info->in[i]);
 584    for (i = 0; i < info->numSysVals; ++i)
 585       recordLocation(sysvalLocation, NULL, &info->sv[i]);
 586
 587    if (sysvalLocation[SV_POSITION] >= 0x200) {
 588       // not assigned by driver, but we need it internally
 589       wposMask = 0x8;
 590       sysvalLocation[SV_POSITION] = 0;
 591    }
 592 }
 593
 594 } // namespace nv50_ir