utils/PerfectShuffle/PerfectShuffle.cpp

   1 //===-- PerfectShuffle.cpp - Perfect Shuffle Generator --------------------===//
   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 // This file computes an optimal sequence of instructions for doing all shuffles
  11 // of two 4-element vectors.  With a release build and when configured to emit
  12 // an altivec instruction table, this takes about 30s to run on a 2.7Ghz
  13 // PowerPC G5.
  14 //
  15 //===----------------------------------------------------------------------===//
  16
  17 #include <iostream>
  18 #include <vector>
  19 #include <cassert>
  20 #include <cstdlib>
  21 struct Operator;
  22
  23 // Masks are 4-nibble hex numbers.  Values 0-7 in any nibble means that it takes
  24 // an element from that value of the input vectors.  A value of 8 means the
  25 // entry is undefined.
  26
  27 // Mask manipulation functions.
  28 static inline unsigned short MakeMask(unsigned V0, unsigned V1,
  29                                       unsigned V2, unsigned V3) {
  30   return (V0 << (3*4)) | (V1 << (2*4)) | (V2 << (1*4)) | (V3 << (0*4));
  31 }
  32
  33 /// getMaskElt - Return element N of the specified mask.
  34 static unsigned getMaskElt(unsigned Mask, unsigned Elt) {
  35   return (Mask >> ((3-Elt)*4)) & 0xF;
  36 }
  37
  38 static unsigned setMaskElt(unsigned Mask, unsigned Elt, unsigned NewVal) {
  39   unsigned FieldShift = ((3-Elt)*4);
  40   return (Mask & ~(0xF << FieldShift)) | (NewVal << FieldShift);
  41 }
  42
  43 // Reject elements where the values are 9-15.
  44 static bool isValidMask(unsigned short Mask) {
  45   unsigned short UndefBits = Mask & 0x8888;
  46   return (Mask & ((UndefBits >> 1)|(UndefBits>>2)|(UndefBits>>3))) == 0;
  47 }
  48
  49 /// hasUndefElements - Return true if any of the elements in the mask are undefs
  50 ///
  51 static bool hasUndefElements(unsigned short Mask) {
  52   return (Mask & 0x8888) != 0;
  53 }
  54
  55 /// isOnlyLHSMask - Return true if this mask only refers to its LHS, not
  56 /// including undef values..
  57 static bool isOnlyLHSMask(unsigned short Mask) {
  58   return (Mask & 0x4444) == 0;
  59 }
  60
  61 /// getLHSOnlyMask - Given a mask that refers to its LHS and RHS, modify it to
  62 /// refer to the LHS only (for when one argument value is passed into the same
  63 /// function twice).
  64 #if 0
  65 static unsigned short getLHSOnlyMask(unsigned short Mask) {
  66   return Mask & 0xBBBB;  // Keep only LHS and Undefs.
  67 }
  68 #endif
  69
  70 /// getCompressedMask - Turn a 16-bit uncompressed mask (where each elt uses 4
  71 /// bits) into a compressed 13-bit mask, where each elt is multiplied by 9.
  72 static unsigned getCompressedMask(unsigned short Mask) {
  73   return getMaskElt(Mask, 0)*9*9*9 + getMaskElt(Mask, 1)*9*9 +
  74          getMaskElt(Mask, 2)*9     + getMaskElt(Mask, 3);
  75 }
  76
  77 static void PrintMask(unsigned i, std::ostream &OS) {
  78   OS << "<" << (char)(getMaskElt(i, 0) == 8 ? 'u' : ('0'+getMaskElt(i, 0)))
  79      << "," << (char)(getMaskElt(i, 1) == 8 ? 'u' : ('0'+getMaskElt(i, 1)))
  80      << "," << (char)(getMaskElt(i, 2) == 8 ? 'u' : ('0'+getMaskElt(i, 2)))
  81      << "," << (char)(getMaskElt(i, 3) == 8 ? 'u' : ('0'+getMaskElt(i, 3)))
  82      << ">";
  83 }
  84
  85 /// ShuffleVal - This represents a shufflevector operation.
  86 struct ShuffleVal {
  87   unsigned Cost;  // Number of instrs used to generate this value.
  88   Operator *Op;   // The Operation used to generate this value.
  89   unsigned short Arg0, Arg1;  // Input operands for this value.
  90
  91   ShuffleVal() : Cost(1000000) {}
  92 };
  93
  94
  95 /// ShufTab - This is the actual shuffle table that we are trying to generate.
  96 ///
  97 static ShuffleVal ShufTab[65536];
  98
  99 /// TheOperators - All of the operators that this target supports.
 100 static std::vector<Operator*> TheOperators;
 101
 102 /// Operator - This is a vector operation that is available for use.
 103 struct Operator {
 104   unsigned short ShuffleMask;
 105   unsigned short OpNum;
 106   const char *Name;
 107   unsigned Cost;
 108
 109   Operator(unsigned short shufflemask, const char *name, unsigned opnum,
 110            unsigned cost = 1)
 111     : ShuffleMask(shufflemask), OpNum(opnum), Name(name), Cost(cost) {
 112     TheOperators.push_back(this);
 113   }
 114   ~Operator() {
 115     assert(TheOperators.back() == this);
 116     TheOperators.pop_back();
 117   }
 118
 119   bool isOnlyLHSOperator() const {
 120     return isOnlyLHSMask(ShuffleMask);
 121   }
 122
 123   const char *getName() const { return Name; }
 124   unsigned getCost() const { return Cost; }
 125
 126   unsigned short getTransformedMask(unsigned short LHSMask, unsigned RHSMask) {
 127     // Extract the elements from LHSMask and RHSMask, as appropriate.
 128     unsigned Result = 0;
 129     for (unsigned i = 0; i != 4; ++i) {
 130       unsigned SrcElt = (ShuffleMask >> (4*i)) & 0xF;
 131       unsigned ResElt;
 132       if (SrcElt < 4)
 133         ResElt = getMaskElt(LHSMask, SrcElt);
 134       else if (SrcElt < 8)
 135         ResElt = getMaskElt(RHSMask, SrcElt-4);
 136       else {
 137         assert(SrcElt == 8 && "Bad src elt!");
 138         ResElt = 8;
 139       }
 140       Result |= ResElt << (4*i);
 141     }
 142     return Result;
 143   }
 144 };
 145
 146 static const char *getZeroCostOpName(unsigned short Op) {
 147   if (ShufTab[Op].Arg0 == 0x0123)
 148     return "LHS";
 149   else if (ShufTab[Op].Arg0 == 0x4567)
 150     return "RHS";
 151   else {
 152     assert(0 && "bad zero cost operation");
 153     abort();
 154   }
 155 }
 156
 157 static void PrintOperation(unsigned ValNo, unsigned short Vals[]) {
 158   unsigned short ThisOp = Vals[ValNo];
 159   std::cerr << "t" << ValNo;
 160   PrintMask(ThisOp, std::cerr);
 161   std::cerr << " = " << ShufTab[ThisOp].Op->getName() << "(";
 162
 163   if (ShufTab[ShufTab[ThisOp].Arg0].Cost == 0) {
 164     std::cerr << getZeroCostOpName(ShufTab[ThisOp].Arg0);
 165     PrintMask(ShufTab[ThisOp].Arg0, std::cerr);
 166   } else {
 167     // Figure out what tmp # it is.
 168     for (unsigned i = 0; ; ++i)
 169       if (Vals[i] == ShufTab[ThisOp].Arg0) {
 170         std::cerr << "t" << i;
 171         break;
 172       }
 173   }
 174
 175   if (!ShufTab[Vals[ValNo]].Op->isOnlyLHSOperator()) {
 176     std::cerr << ", ";
 177     if (ShufTab[ShufTab[ThisOp].Arg1].Cost == 0) {
 178       std::cerr << getZeroCostOpName(ShufTab[ThisOp].Arg1);
 179       PrintMask(ShufTab[ThisOp].Arg1, std::cerr);
 180     } else {
 181       // Figure out what tmp # it is.
 182       for (unsigned i = 0; ; ++i)
 183         if (Vals[i] == ShufTab[ThisOp].Arg1) {
 184           std::cerr << "t" << i;
 185           break;
 186         }
 187     }
 188   }
 189   std::cerr << ")  ";
 190 }
 191
 192 static unsigned getNumEntered() {
 193   unsigned Count = 0;
 194   for (unsigned i = 0; i != 65536; ++i)
 195     Count += ShufTab[i].Cost < 100;
 196   return Count;
 197 }
 198
 199 static void EvaluateOps(unsigned short Elt, unsigned short Vals[],
 200                         unsigned &NumVals) {
 201   if (ShufTab[Elt].Cost == 0) return;
 202
 203   // If this value has already been evaluated, it is free.  FIXME: match undefs.
 204   for (unsigned i = 0, e = NumVals; i != e; ++i)
 205     if (Vals[i] == Elt) return;
 206
 207   // Otherwise, get the operands of the value, then add it.
 208   unsigned Arg0 = ShufTab[Elt].Arg0, Arg1 = ShufTab[Elt].Arg1;
 209   if (ShufTab[Arg0].Cost)
 210     EvaluateOps(Arg0, Vals, NumVals);
 211   if (Arg0 != Arg1 && ShufTab[Arg1].Cost)
 212     EvaluateOps(Arg1, Vals, NumVals);
 213
 214   Vals[NumVals++] = Elt;
 215 }
 216
 217
 218 int main() {
 219   // Seed the table with accesses to the LHS and RHS.
 220   ShufTab[0x0123].Cost = 0;
 221   ShufTab[0x0123].Op = 0;
 222   ShufTab[0x0123].Arg0 = 0x0123;
 223   ShufTab[0x4567].Cost = 0;
 224   ShufTab[0x4567].Op = 0;
 225   ShufTab[0x4567].Arg0 = 0x4567;
 226
 227   // Seed the first-level of shuffles, shuffles whose inputs are the input to
 228   // the vectorshuffle operation.
 229   bool MadeChange = true;
 230   unsigned OpCount = 0;
 231   while (MadeChange) {
 232     MadeChange = false;
 233     ++OpCount;
 234     std::cerr << "Starting iteration #" << OpCount << " with "
 235               << getNumEntered() << " entries established.\n";
 236
 237     // Scan the table for two reasons: First, compute the maximum cost of any
 238     // operation left in the table.  Second, make sure that values with undefs
 239     // have the cheapest alternative that they match.
 240     unsigned MaxCost = ShufTab[0].Cost;
 241     for (unsigned i = 1; i != 0x8889; ++i) {
 242       if (!isValidMask(i)) continue;
 243       if (ShufTab[i].Cost > MaxCost)
 244         MaxCost = ShufTab[i].Cost;
 245
 246       // If this value has an undef, make it be computed the cheapest possible
 247       // way of any of the things that it matches.
 248       if (hasUndefElements(i)) {
 249         // This code is a little bit tricky, so here's the idea: consider some
 250         // permutation, like 7u4u.  To compute the lowest cost for 7u4u, we
 251         // need to take the minimum cost of all of 7[0-8]4[0-8], 81 entries.  If
 252         // there are 3 undefs, the number rises to 729 entries we have to scan,
 253         // and for the 4 undef case, we have to scan the whole table.
 254         //
 255         // Instead of doing this huge amount of scanning, we process the table
 256         // entries *in order*, and use the fact that 'u' is 8, larger than any
 257         // valid index.  Given an entry like 7u4u then, we only need to scan
 258         // 7[0-7]4u - 8 entries.  We can get away with this, because we already
 259         // know that each of 704u, 714u, 724u, etc contain the minimum value of
 260         // all of the 704[0-8], 714[0-8] and 724[0-8] entries respectively.
 261         unsigned UndefIdx;
 262         if (i & 0x8000)
 263           UndefIdx = 0;
 264         else if (i & 0x0800)
 265           UndefIdx = 1;
 266         else if (i & 0x0080)
 267           UndefIdx = 2;
 268         else if (i & 0x0008)
 269           UndefIdx = 3;
 270         else
 271           abort();
 272
 273         unsigned MinVal  = i;
 274         unsigned MinCost = ShufTab[i].Cost;
 275
 276         // Scan the 8 entries.
 277         for (unsigned j = 0; j != 8; ++j) {
 278           unsigned NewElt = setMaskElt(i, UndefIdx, j);
 279           if (ShufTab[NewElt].Cost < MinCost) {
 280             MinCost = ShufTab[NewElt].Cost;
 281             MinVal = NewElt;
 282           }
 283         }
 284
 285         // If we found something cheaper than what was here before, use it.
 286         if (i != MinVal) {
 287           MadeChange = true;
 288           ShufTab[i] = ShufTab[MinVal];
 289         }
 290       }
 291     }
 292
 293     for (unsigned LHS = 0; LHS != 0x8889; ++LHS) {
 294       if (!isValidMask(LHS)) continue;
 295       if (ShufTab[LHS].Cost > 1000) continue;
 296
 297       // If nothing involving this operand could possibly be cheaper than what
 298       // we already have, don't consider it.
 299       if (ShufTab[LHS].Cost + 1 >= MaxCost)
 300         continue;
 301
 302       for (unsigned opnum = 0, e = TheOperators.size(); opnum != e; ++opnum) {
 303         Operator *Op = TheOperators[opnum];
 304
 305         // Evaluate op(LHS,LHS)
 306         unsigned ResultMask = Op->getTransformedMask(LHS, LHS);
 307
 308         unsigned Cost = ShufTab[LHS].Cost + Op->getCost();
 309         if (Cost < ShufTab[ResultMask].Cost) {
 310           ShufTab[ResultMask].Cost = Cost;
 311           ShufTab[ResultMask].Op = Op;
 312           ShufTab[ResultMask].Arg0 = LHS;
 313           ShufTab[ResultMask].Arg1 = LHS;
 314           MadeChange = true;
 315         }
 316
 317         // If this is a two input instruction, include the op(x,y) cases.  If
 318         // this is a one input instruction, skip this.
 319         if (Op->isOnlyLHSOperator()) continue;
 320
 321         for (unsigned RHS = 0; RHS != 0x8889; ++RHS) {
 322           if (!isValidMask(RHS)) continue;
 323           if (ShufTab[RHS].Cost > 1000) continue;
 324
 325           // If nothing involving this operand could possibly be cheaper than
 326           // what we already have, don't consider it.
 327           if (ShufTab[RHS].Cost + 1 >= MaxCost)
 328             continue;
 329
 330
 331           // Evaluate op(LHS,RHS)
 332           unsigned ResultMask = Op->getTransformedMask(LHS, RHS);
 333
 334           if (ShufTab[ResultMask].Cost <= OpCount ||
 335               ShufTab[ResultMask].Cost <= ShufTab[LHS].Cost ||
 336               ShufTab[ResultMask].Cost <= ShufTab[RHS].Cost)
 337             continue;
 338
 339           // Figure out the cost to evaluate this, knowing that CSE's only need
 340           // to be evaluated once.
 341           unsigned short Vals[30];
 342           unsigned NumVals = 0;
 343           EvaluateOps(LHS, Vals, NumVals);
 344           EvaluateOps(RHS, Vals, NumVals);
 345
 346           unsigned Cost = NumVals + Op->getCost();
 347           if (Cost < ShufTab[ResultMask].Cost) {
 348             ShufTab[ResultMask].Cost = Cost;
 349             ShufTab[ResultMask].Op = Op;
 350             ShufTab[ResultMask].Arg0 = LHS;
 351             ShufTab[ResultMask].Arg1 = RHS;
 352             MadeChange = true;
 353           }
 354         }
 355       }
 356     }
 357   }
 358
 359   std::cerr << "Finished Table has " << getNumEntered()
 360             << " entries established.\n";
 361
 362   unsigned CostArray[10] = { 0 };
 363
 364   // Compute a cost histogram.
 365   for (unsigned i = 0; i != 65536; ++i) {
 366     if (!isValidMask(i)) continue;
 367     if (ShufTab[i].Cost > 9)
 368       ++CostArray[9];
 369     else
 370       ++CostArray[ShufTab[i].Cost];
 371   }
 372
 373   for (unsigned i = 0; i != 9; ++i)
 374     if (CostArray[i])
 375       std::cout << "// " << CostArray[i] << " entries have cost " << i << "\n";
 376   if (CostArray[9])
 377     std::cout << "// " << CostArray[9] << " entries have higher cost!\n";
 378
 379
 380   // Build up the table to emit.
 381   std::cout << "\n// This table is 6561*4 = 26244 bytes in size.\n";
 382   std::cout << "static const unsigned PerfectShuffleTable[6561+1] = {\n";
 383
 384   for (unsigned i = 0; i != 0x8889; ++i) {
 385     if (!isValidMask(i)) continue;
 386
 387     // CostSat - The cost of this operation saturated to two bits.
 388     unsigned CostSat = ShufTab[i].Cost;
 389     if (CostSat > 4) CostSat = 4;
 390     if (CostSat == 0) CostSat = 1;
 391     --CostSat;  // Cost is now between 0-3.
 392
 393     unsigned OpNum = ShufTab[i].Op ? ShufTab[i].Op->OpNum : 0;
 394     assert(OpNum < 16 && "Too few bits to encode operation!");
 395
 396     unsigned LHS = getCompressedMask(ShufTab[i].Arg0);
 397     unsigned RHS = getCompressedMask(ShufTab[i].Arg1);
 398
 399     // Encode this as 2 bits of saturated cost, 4 bits of opcodes, 13 bits of
 400     // LHS, and 13 bits of RHS = 32 bits.
 401     unsigned Val = (CostSat << 30) | (OpNum << 26) | (LHS << 13) | RHS;
 402
 403     std::cout << "  " << Val << "U,\t// ";
 404     PrintMask(i, std::cout);
 405     std::cout << ": Cost " << ShufTab[i].Cost;
 406     std::cout << " " << (ShufTab[i].Op ? ShufTab[i].Op->getName() : "copy");
 407     std::cout << " ";
 408     if (ShufTab[ShufTab[i].Arg0].Cost == 0) {
 409       std::cout << getZeroCostOpName(ShufTab[i].Arg0);
 410     } else {
 411       PrintMask(ShufTab[i].Arg0, std::cout);
 412     }
 413
 414     if (ShufTab[i].Op && !ShufTab[i].Op->isOnlyLHSOperator()) {
 415       std::cout << ", ";
 416       if (ShufTab[ShufTab[i].Arg1].Cost == 0) {
 417         std::cout << getZeroCostOpName(ShufTab[i].Arg1);
 418       } else {
 419         PrintMask(ShufTab[i].Arg1, std::cout);
 420       }
 421     }
 422     std::cout << "\n";
 423   }
 424   std::cout << "  0\n};\n";
 425
 426   if (0) {
 427     // Print out the table.
 428     for (unsigned i = 0; i != 0x8889; ++i) {
 429       if (!isValidMask(i)) continue;
 430       if (ShufTab[i].Cost < 1000) {
 431         PrintMask(i, std::cerr);
 432         std::cerr << " - Cost " << ShufTab[i].Cost << " - ";
 433
 434         unsigned short Vals[30];
 435         unsigned NumVals = 0;
 436         EvaluateOps(i, Vals, NumVals);
 437
 438         for (unsigned j = 0, e = NumVals; j != e; ++j)
 439           PrintOperation(j, Vals);
 440         std::cerr << "\n";
 441       }
 442     }
 443   }
 444 }
 445
 446
 447 #ifdef GENERATE_ALTIVEC
 448
 449 ///===---------------------------------------------------------------------===//
 450 /// The altivec instruction definitions.  This is the altivec-specific part of
 451 /// this file.
 452 ///===---------------------------------------------------------------------===//
 453
 454 // Note that the opcode numbers here must match those in the PPC backend.
 455 enum {
 456   OP_COPY = 0,   // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
 457   OP_VMRGHW,
 458   OP_VMRGLW,
 459   OP_VSPLTISW0,
 460   OP_VSPLTISW1,
 461   OP_VSPLTISW2,
 462   OP_VSPLTISW3,
 463   OP_VSLDOI4,
 464   OP_VSLDOI8,
 465   OP_VSLDOI12
 466 };
 467
 468 struct vmrghw : public Operator {
 469   vmrghw() : Operator(0x0415, "vmrghw", OP_VMRGHW) {}
 470 } the_vmrghw;
 471
 472 struct vmrglw : public Operator {
 473   vmrglw() : Operator(0x2637, "vmrglw", OP_VMRGLW) {}
 474 } the_vmrglw;
 475
 476 template<unsigned Elt>
 477 struct vspltisw : public Operator {
 478   vspltisw(const char *N, unsigned Opc)
 479     : Operator(MakeMask(Elt, Elt, Elt, Elt), N, Opc) {}
 480 };
 481
 482 vspltisw<0> the_vspltisw0("vspltisw0", OP_VSPLTISW0);
 483 vspltisw<1> the_vspltisw1("vspltisw1", OP_VSPLTISW1);
 484 vspltisw<2> the_vspltisw2("vspltisw2", OP_VSPLTISW2);
 485 vspltisw<3> the_vspltisw3("vspltisw3", OP_VSPLTISW3);
 486
 487 template<unsigned N>
 488 struct vsldoi : public Operator {
 489   vsldoi(const char *Name, unsigned Opc)
 490     : Operator(MakeMask(N&7, (N+1)&7, (N+2)&7, (N+3)&7), Name, Opc) {
 491   }
 492 };
 493
 494 vsldoi<1> the_vsldoi1("vsldoi4" , OP_VSLDOI4);
 495 vsldoi<2> the_vsldoi2("vsldoi8" , OP_VSLDOI8);
 496 vsldoi<3> the_vsldoi3("vsldoi12", OP_VSLDOI12);
 497
 498 #endif
 499
 500 #define GENERATE_NEON
 501
 502 #ifdef GENERATE_NEON
 503 enum {
 504   OP_COPY = 0,   // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
 505   OP_VREV,
 506   OP_VDUP0,
 507   OP_VDUP1,
 508   OP_VDUP2,
 509   OP_VDUP3,
 510   OP_VEXT1,
 511   OP_VEXT2,
 512   OP_VEXT3,
 513   OP_VUZPL, // VUZP, left result
 514   OP_VUZPR, // VUZP, right result
 515   OP_VZIPL, // VZIP, left result
 516   OP_VZIPR, // VZIP, right result
 517   OP_VTRNL, // VTRN, left result
 518   OP_VTRNR  // VTRN, right result
 519 };
 520
 521 struct vrev : public Operator {
 522   vrev() : Operator(0x1032, "vrev", OP_VREV) {}
 523 } the_vrev;
 524
 525 template<unsigned Elt>
 526 struct vdup : public Operator {
 527   vdup(const char *N, unsigned Opc)
 528     : Operator(MakeMask(Elt, Elt, Elt, Elt), N, Opc) {}
 529 };
 530
 531 vdup<0> the_vdup0("vdup0", OP_VDUP0);
 532 vdup<1> the_vdup1("vdup1", OP_VDUP1);
 533 vdup<2> the_vdup2("vdup2", OP_VDUP2);
 534 vdup<3> the_vdup3("vdup3", OP_VDUP3);
 535
 536 template<unsigned N>
 537 struct vext : public Operator {
 538   vext(const char *Name, unsigned Opc)
 539     : Operator(MakeMask(N&7, (N+1)&7, (N+2)&7, (N+3)&7), Name, Opc) {
 540   }
 541 };
 542
 543 vext<1> the_vext1("vext1", OP_VEXT1);
 544 vext<2> the_vext2("vext2", OP_VEXT2);
 545 vext<3> the_vext3("vext3", OP_VEXT3);
 546
 547 struct vuzpl : public Operator {
 548   vuzpl() : Operator(0x1032, "vuzpl", OP_VUZPL, 2) {}
 549 } the_vuzpl;
 550
 551 struct vuzpr : public Operator {
 552   vuzpr() : Operator(0x4602, "vuzpr", OP_VUZPR, 2) {}
 553 } the_vuzpr;
 554
 555 struct vzipl : public Operator {
 556   vzipl() : Operator(0x6273, "vzipl", OP_VZIPL, 2) {}
 557 } the_vzipl;
 558
 559 struct vzipr : public Operator {
 560   vzipr() : Operator(0x4051, "vzipr", OP_VZIPR, 2) {}
 561 } the_vzipr;
 562
 563 struct vtrnl : public Operator {
 564   vtrnl() : Operator(0x5173, "vtrnl", OP_VTRNL, 2) {}
 565 } the_vtrnl;
 566
 567 struct vtrnr : public Operator {
 568   vtrnr() : Operator(0x4062, "vtrnr", OP_VTRNR, 2) {}
 569 } the_vtrnr;
 570
 571 #endif