gas/config/atof-ieee.c

   1 /* atof_ieee.c - turn a Flonum into an IEEE floating point number
   2    Copyright 1987, 1992, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2005
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 #include "as.h"
  23
  24 /* Flonums returned here.  */
  25 extern FLONUM_TYPE generic_floating_point_number;
  26
  27 extern const char EXP_CHARS[];
  28 /* Precision in LittleNums.  */
  29 /* Don't count the gap in the m68k extended precision format.  */
  30 #define MAX_PRECISION  5
  31 #define F_PRECISION    2
  32 #define D_PRECISION    4
  33 #define X_PRECISION    5
  34 #define P_PRECISION    5
  35
  36 /* Length in LittleNums of guard bits.  */
  37 #define GUARD          2
  38
  39 #ifndef TC_LARGEST_EXPONENT_IS_NORMAL
  40 #define TC_LARGEST_EXPONENT_IS_NORMAL(PRECISION) 0
  41 #endif
  42
  43 static const unsigned long mask[] =
  44 {
  45   0x00000000,
  46   0x00000001,
  47   0x00000003,
  48   0x00000007,
  49   0x0000000f,
  50   0x0000001f,
  51   0x0000003f,
  52   0x0000007f,
  53   0x000000ff,
  54   0x000001ff,
  55   0x000003ff,
  56   0x000007ff,
  57   0x00000fff,
  58   0x00001fff,
  59   0x00003fff,
  60   0x00007fff,
  61   0x0000ffff,
  62   0x0001ffff,
  63   0x0003ffff,
  64   0x0007ffff,
  65   0x000fffff,
  66   0x001fffff,
  67   0x003fffff,
  68   0x007fffff,
  69   0x00ffffff,
  70   0x01ffffff,
  71   0x03ffffff,
  72   0x07ffffff,
  73   0x0fffffff,
  74   0x1fffffff,
  75   0x3fffffff,
  76   0x7fffffff,
  77   0xffffffff,
  78 };
  79 \f
  80 static int bits_left_in_littlenum;
  81 static int littlenums_left;
  82 static LITTLENUM_TYPE *littlenum_pointer;
  83
  84 static int
  85 next_bits (int number_of_bits)
  86 {
  87   int return_value;
  88
  89   if (!littlenums_left)
  90     return 0;
  91
  92   if (number_of_bits >= bits_left_in_littlenum)
  93     {
  94       return_value = mask[bits_left_in_littlenum] & *littlenum_pointer;
  95       number_of_bits -= bits_left_in_littlenum;
  96       return_value <<= number_of_bits;
  97
  98       if (--littlenums_left)
  99         {
 100           bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS - number_of_bits;
 101           --littlenum_pointer;
 102           return_value |=
 103             (*littlenum_pointer >> bits_left_in_littlenum)
 104             & mask[number_of_bits];
 105         }
 106     }
 107   else
 108     {
 109       bits_left_in_littlenum -= number_of_bits;
 110       return_value =
 111         mask[number_of_bits] & (*littlenum_pointer >> bits_left_in_littlenum);
 112     }
 113   return return_value;
 114 }
 115
 116 /* Num had better be less than LITTLENUM_NUMBER_OF_BITS.  */
 117
 118 static void
 119 unget_bits (int num)
 120 {
 121   if (!littlenums_left)
 122     {
 123       ++littlenum_pointer;
 124       ++littlenums_left;
 125       bits_left_in_littlenum = num;
 126     }
 127   else if (bits_left_in_littlenum + num > LITTLENUM_NUMBER_OF_BITS)
 128     {
 129       bits_left_in_littlenum =
 130         num - (LITTLENUM_NUMBER_OF_BITS - bits_left_in_littlenum);
 131       ++littlenum_pointer;
 132       ++littlenums_left;
 133     }
 134   else
 135     bits_left_in_littlenum += num;
 136 }
 137
 138 static void
 139 make_invalid_floating_point_number (LITTLENUM_TYPE *words)
 140 {
 141   as_bad (_("cannot create floating-point number"));
 142   /* Zero the leftmost bit.  */
 143   words[0] = (LITTLENUM_TYPE) ((unsigned) -1) >> 1;
 144   words[1] = (LITTLENUM_TYPE) -1;
 145   words[2] = (LITTLENUM_TYPE) -1;
 146   words[3] = (LITTLENUM_TYPE) -1;
 147   words[4] = (LITTLENUM_TYPE) -1;
 148   words[5] = (LITTLENUM_TYPE) -1;
 149 }
 150 \f
 151 /* Warning: This returns 16-bit LITTLENUMs.  It is up to the caller to
 152    figure out any alignment problems and to conspire for the
 153    bytes/word to be emitted in the right order.  Bigendians beware!  */
 154
 155 /* Note that atof-ieee always has X and P precisions enabled.  it is up
 156    to md_atof to filter them out if the target machine does not support
 157    them.  */
 158
 159 /* Returns pointer past text consumed.  */
 160
 161 char *
 162 atof_ieee (char *str,                   /* Text to convert to binary.  */
 163            int what_kind,               /* 'd', 'f', 'g', 'h'.  */
 164            LITTLENUM_TYPE *words)       /* Build the binary here.  */
 165 {
 166   /* Extra bits for zeroed low-order bits.
 167      The 1st MAX_PRECISION are zeroed, the last contain flonum bits.  */
 168   static LITTLENUM_TYPE bits[MAX_PRECISION + MAX_PRECISION + GUARD];
 169   char *return_value;
 170   /* Number of 16-bit words in the format.  */
 171   int precision;
 172   long exponent_bits;
 173   FLONUM_TYPE save_gen_flonum;
 174
 175   /* We have to save the generic_floating_point_number because it
 176      contains storage allocation about the array of LITTLENUMs where
 177      the value is actually stored.  We will allocate our own array of
 178      littlenums below, but have to restore the global one on exit.  */
 179   save_gen_flonum = generic_floating_point_number;
 180
 181   return_value = str;
 182   generic_floating_point_number.low = bits + MAX_PRECISION;
 183   generic_floating_point_number.high = NULL;
 184   generic_floating_point_number.leader = NULL;
 185   generic_floating_point_number.exponent = 0;
 186   generic_floating_point_number.sign = '\0';
 187
 188   /* Use more LittleNums than seems necessary: the highest flonum may
 189      have 15 leading 0 bits, so could be useless.  */
 190
 191   memset (bits, '\0', sizeof (LITTLENUM_TYPE) * MAX_PRECISION);
 192
 193   switch (what_kind)
 194     {
 195     case 'f':
 196     case 'F':
 197     case 's':
 198     case 'S':
 199       precision = F_PRECISION;
 200       exponent_bits = 8;
 201       break;
 202
 203     case 'd':
 204     case 'D':
 205     case 'r':
 206     case 'R':
 207       precision = D_PRECISION;
 208       exponent_bits = 11;
 209       break;
 210
 211     case 'x':
 212     case 'X':
 213     case 'e':
 214     case 'E':
 215       precision = X_PRECISION;
 216       exponent_bits = 15;
 217       break;
 218
 219     case 'p':
 220     case 'P':
 221
 222       precision = P_PRECISION;
 223       exponent_bits = -1;
 224       break;
 225
 226     default:
 227       make_invalid_floating_point_number (words);
 228       return (NULL);
 229     }
 230
 231   generic_floating_point_number.high
 232     = generic_floating_point_number.low + precision - 1 + GUARD;
 233
 234   if (atof_generic (&return_value, ".", EXP_CHARS,
 235                     &generic_floating_point_number))
 236     {
 237       make_invalid_floating_point_number (words);
 238       return NULL;
 239     }
 240   gen_to_words (words, precision, exponent_bits);
 241
 242   /* Restore the generic_floating_point_number's storage alloc (and
 243      everything else).  */
 244   generic_floating_point_number = save_gen_flonum;
 245
 246   return return_value;
 247 }
 248
 249 /* Turn generic_floating_point_number into a real float/double/extended.  */
 250
 251 int
 252 gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
 253 {
 254   int return_value = 0;
 255
 256   long exponent_1;
 257   long exponent_2;
 258   long exponent_3;
 259   long exponent_4;
 260   int exponent_skippage;
 261   LITTLENUM_TYPE word1;
 262   LITTLENUM_TYPE *lp;
 263   LITTLENUM_TYPE *words_end;
 264
 265   words_end = words + precision;
 266 #ifdef TC_M68K
 267   if (precision == X_PRECISION)
 268     /* On the m68k the extended precision format has a gap of 16 bits
 269        between the exponent and the mantissa.  */
 270     words_end++;
 271 #endif
 272
 273   if (generic_floating_point_number.low > generic_floating_point_number.leader)
 274     {
 275       /* 0.0e0 seen.  */
 276       if (generic_floating_point_number.sign == '+')
 277         words[0] = 0x0000;
 278       else
 279         words[0] = 0x8000;
 280       memset (&words[1], '\0',
 281               (words_end - words - 1) * sizeof (LITTLENUM_TYPE));
 282       return return_value;
 283     }
 284
 285   /* NaN:  Do the right thing.  */
 286   if (generic_floating_point_number.sign == 0)
 287     {
 288       if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
 289         as_warn ("NaNs are not supported by this target\n");
 290       if (precision == F_PRECISION)
 291         {
 292           words[0] = 0x7fff;
 293           words[1] = 0xffff;
 294         }
 295       else if (precision == X_PRECISION)
 296         {
 297 #ifdef TC_M68K
 298           words[0] = 0x7fff;
 299           words[1] = 0;
 300           words[2] = 0xffff;
 301           words[3] = 0xffff;
 302           words[4] = 0xffff;
 303           words[5] = 0xffff;
 304 #else /* ! TC_M68K  */
 305 #ifdef TC_I386
 306           words[0] = 0xffff;
 307           words[1] = 0xc000;
 308           words[2] = 0;
 309           words[3] = 0;
 310           words[4] = 0;
 311 #else /* ! TC_I386  */
 312           abort ();
 313 #endif /* ! TC_I386  */
 314 #endif /* ! TC_M68K  */
 315         }
 316       else
 317         {
 318           words[0] = 0x7fff;
 319           words[1] = 0xffff;
 320           words[2] = 0xffff;
 321           words[3] = 0xffff;
 322         }
 323       return return_value;
 324     }
 325   else if (generic_floating_point_number.sign == 'P')
 326     {
 327       if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
 328         as_warn ("Infinities are not supported by this target\n");
 329
 330       /* +INF:  Do the right thing.  */
 331       if (precision == F_PRECISION)
 332         {
 333           words[0] = 0x7f80;
 334           words[1] = 0;
 335         }
 336       else if (precision == X_PRECISION)
 337         {
 338 #ifdef TC_M68K
 339           words[0] = 0x7fff;
 340           words[1] = 0;
 341           words[2] = 0;
 342           words[3] = 0;
 343           words[4] = 0;
 344           words[5] = 0;
 345 #else /* ! TC_M68K  */
 346 #ifdef TC_I386
 347           words[0] = 0x7fff;
 348           words[1] = 0x8000;
 349           words[2] = 0;
 350           words[3] = 0;
 351           words[4] = 0;
 352 #else /* ! TC_I386  */
 353           abort ();
 354 #endif /* ! TC_I386  */
 355 #endif /* ! TC_M68K  */
 356         }
 357       else
 358         {
 359           words[0] = 0x7ff0;
 360           words[1] = 0;
 361           words[2] = 0;
 362           words[3] = 0;
 363         }
 364       return return_value;
 365     }
 366   else if (generic_floating_point_number.sign == 'N')
 367     {
 368       if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
 369         as_warn ("Infinities are not supported by this target\n");
 370
 371       /* Negative INF.  */
 372       if (precision == F_PRECISION)
 373         {
 374           words[0] = 0xff80;
 375           words[1] = 0x0;
 376         }
 377       else if (precision == X_PRECISION)
 378         {
 379 #ifdef TC_M68K
 380           words[0] = 0xffff;
 381           words[1] = 0;
 382           words[2] = 0;
 383           words[3] = 0;
 384           words[4] = 0;
 385           words[5] = 0;
 386 #else /* ! TC_M68K  */
 387 #ifdef TC_I386
 388           words[0] = 0xffff;
 389           words[1] = 0x8000;
 390           words[2] = 0;
 391           words[3] = 0;
 392           words[4] = 0;
 393 #else /* ! TC_I386  */
 394           abort ();
 395 #endif /* ! TC_I386  */
 396 #endif /* ! TC_M68K  */
 397         }
 398       else
 399         {
 400           words[0] = 0xfff0;
 401           words[1] = 0x0;
 402           words[2] = 0x0;
 403           words[3] = 0x0;
 404         }
 405       return return_value;
 406     }
 407
 408   /* The floating point formats we support have:
 409      Bit 15 is sign bit.
 410      Bits 14:n are excess-whatever exponent.
 411      Bits n-1:0 (if any) are most significant bits of fraction.
 412      Bits 15:0 of the next word(s) are the next most significant bits.
 413
 414      So we need: number of bits of exponent, number of bits of
 415      mantissa.  */
 416   bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS;
 417   littlenum_pointer = generic_floating_point_number.leader;
 418   littlenums_left = (1
 419                      + generic_floating_point_number.leader
 420                      - generic_floating_point_number.low);
 421
 422   /* Seek (and forget) 1st significant bit.  */
 423   for (exponent_skippage = 0; !next_bits (1); ++exponent_skippage);;
 424   exponent_1 = (generic_floating_point_number.exponent
 425                 + generic_floating_point_number.leader
 426                 + 1
 427                 - generic_floating_point_number.low);
 428
 429   /* Radix LITTLENUM_RADIX, point just higher than
 430      generic_floating_point_number.leader.  */
 431   exponent_2 = exponent_1 * LITTLENUM_NUMBER_OF_BITS;
 432
 433   /* Radix 2.  */
 434   exponent_3 = exponent_2 - exponent_skippage;
 435
 436   /* Forget leading zeros, forget 1st bit.  */
 437   exponent_4 = exponent_3 + ((1 << (exponent_bits - 1)) - 2);
 438
 439   /* Offset exponent.  */
 440   lp = words;
 441
 442   /* Word 1.  Sign, exponent and perhaps high bits.  */
 443   word1 = ((generic_floating_point_number.sign == '+')
 444            ? 0
 445            : (1 << (LITTLENUM_NUMBER_OF_BITS - 1)));
 446
 447   /* Assume 2's complement integers.  */
 448   if (exponent_4 <= 0)
 449     {
 450       int prec_bits;
 451       int num_bits;
 452
 453       unget_bits (1);
 454       num_bits = -exponent_4;
 455       prec_bits =
 456         LITTLENUM_NUMBER_OF_BITS * precision - (exponent_bits + 1 + num_bits);
 457 #ifdef TC_I386
 458       if (precision == X_PRECISION && exponent_bits == 15)
 459         {
 460           /* On the i386 a denormalized extended precision float is
 461              shifted down by one, effectively decreasing the exponent
 462              bias by one.  */
 463           prec_bits -= 1;
 464           num_bits += 1;
 465         }
 466 #endif
 467
 468       if (num_bits >= LITTLENUM_NUMBER_OF_BITS - exponent_bits)
 469         {
 470           /* Bigger than one littlenum.  */
 471           num_bits -= (LITTLENUM_NUMBER_OF_BITS - 1) - exponent_bits;
 472           *lp++ = word1;
 473           if (num_bits + exponent_bits + 1
 474               > precision * LITTLENUM_NUMBER_OF_BITS)
 475             {
 476               /* Exponent overflow.  */
 477               make_invalid_floating_point_number (words);
 478               return return_value;
 479             }
 480 #ifdef TC_M68K
 481           if (precision == X_PRECISION && exponent_bits == 15)
 482             *lp++ = 0;
 483 #endif
 484           while (num_bits >= LITTLENUM_NUMBER_OF_BITS)
 485             {
 486               num_bits -= LITTLENUM_NUMBER_OF_BITS;
 487               *lp++ = 0;
 488             }
 489           if (num_bits)
 490             *lp++ = next_bits (LITTLENUM_NUMBER_OF_BITS - (num_bits));
 491         }
 492       else
 493         {
 494           if (precision == X_PRECISION && exponent_bits == 15)
 495             {
 496               *lp++ = word1;
 497 #ifdef TC_M68K
 498               *lp++ = 0;
 499 #endif
 500               *lp++ = next_bits (LITTLENUM_NUMBER_OF_BITS - num_bits);
 501             }
 502           else
 503             {
 504               word1 |= next_bits ((LITTLENUM_NUMBER_OF_BITS - 1)
 505                                   - (exponent_bits + num_bits));
 506               *lp++ = word1;
 507             }
 508         }
 509       while (lp < words_end)
 510         *lp++ = next_bits (LITTLENUM_NUMBER_OF_BITS);
 511
 512       /* Round the mantissa up, but don't change the number.  */
 513       if (next_bits (1))
 514         {
 515           --lp;
 516           if (prec_bits >= LITTLENUM_NUMBER_OF_BITS)
 517             {
 518               int n = 0;
 519               int tmp_bits;
 520
 521               n = 0;
 522               tmp_bits = prec_bits;
 523               while (tmp_bits > LITTLENUM_NUMBER_OF_BITS)
 524                 {
 525                   if (lp[n] != (LITTLENUM_TYPE) - 1)
 526                     break;
 527                   --n;
 528                   tmp_bits -= LITTLENUM_NUMBER_OF_BITS;
 529                 }
 530               if (tmp_bits > LITTLENUM_NUMBER_OF_BITS
 531                   || (lp[n] & mask[tmp_bits]) != mask[tmp_bits]
 532                   || (prec_bits != (precision * LITTLENUM_NUMBER_OF_BITS
 533                                     - exponent_bits - 1)
 534 #ifdef TC_I386
 535                       /* An extended precision float with only the integer
 536                          bit set would be invalid.  That must be converted
 537                          to the smallest normalized number.  */
 538                       && !(precision == X_PRECISION
 539                            && prec_bits == (precision * LITTLENUM_NUMBER_OF_BITS
 540                                             - exponent_bits - 2))
 541 #endif
 542                       ))
 543                 {
 544                   unsigned long carry;
 545
 546                   for (carry = 1; carry && (lp >= words); lp--)
 547                     {
 548                       carry = *lp + carry;
 549                       *lp = carry;
 550                       carry >>= LITTLENUM_NUMBER_OF_BITS;
 551                     }
 552                 }
 553               else
 554                 {
 555                   /* This is an overflow of the denormal numbers.  We
 556                      need to forget what we have produced, and instead
 557                      generate the smallest normalized number.  */
 558                   lp = words;
 559                   word1 = ((generic_floating_point_number.sign == '+')
 560                            ? 0
 561                            : (1 << (LITTLENUM_NUMBER_OF_BITS - 1)));
 562                   word1 |= (1
 563                             << ((LITTLENUM_NUMBER_OF_BITS - 1)
 564                                 - exponent_bits));
 565                   *lp++ = word1;
 566 #ifdef TC_I386
 567                   /* Set the integer bit in the extended precision format.
 568                      This cannot happen on the m68k where the mantissa
 569                      just overflows into the integer bit above.  */
 570                   if (precision == X_PRECISION)
 571                     *lp++ = 1 << (LITTLENUM_NUMBER_OF_BITS - 1);
 572 #endif
 573                   while (lp < words_end)
 574                     *lp++ = 0;
 575                 }
 576             }
 577           else
 578             *lp += 1;
 579         }
 580
 581       return return_value;
 582     }
 583   else if ((unsigned long) exponent_4 > mask[exponent_bits]
 584            || (! TC_LARGEST_EXPONENT_IS_NORMAL (precision)
 585                && (unsigned long) exponent_4 == mask[exponent_bits]))
 586     {
 587       /* Exponent overflow.  Lose immediately.  */
 588
 589       /* We leave return_value alone: admit we read the
 590          number, but return a floating exception
 591          because we can't encode the number.  */
 592       make_invalid_floating_point_number (words);
 593       return return_value;
 594     }
 595   else
 596     {
 597       word1 |= (exponent_4 << ((LITTLENUM_NUMBER_OF_BITS - 1) - exponent_bits))
 598         | next_bits ((LITTLENUM_NUMBER_OF_BITS - 1) - exponent_bits);
 599     }
 600
 601   *lp++ = word1;
 602
 603   /* X_PRECISION is special: on the 68k, it has 16 bits of zero in the
 604      middle.  Either way, it is then followed by a 1 bit.  */
 605   if (exponent_bits == 15 && precision == X_PRECISION)
 606     {
 607 #ifdef TC_M68K
 608       *lp++ = 0;
 609 #endif
 610       *lp++ = (1 << (LITTLENUM_NUMBER_OF_BITS - 1)
 611                | next_bits (LITTLENUM_NUMBER_OF_BITS - 1));
 612     }
 613
 614   /* The rest of the words are just mantissa bits.  */
 615   while (lp < words_end)
 616     *lp++ = next_bits (LITTLENUM_NUMBER_OF_BITS);
 617
 618   if (next_bits (1))
 619     {
 620       unsigned long carry;
 621       /* Since the NEXT bit is a 1, round UP the mantissa.
 622          The cunning design of these hidden-1 floats permits
 623          us to let the mantissa overflow into the exponent, and
 624          it 'does the right thing'. However, we lose if the
 625          highest-order bit of the lowest-order word flips.
 626          Is that clear?  */
 627
 628       /* #if (sizeof(carry)) < ((sizeof(bits[0]) * BITS_PER_CHAR) + 2)
 629          Please allow at least 1 more bit in carry than is in a LITTLENUM.
 630          We need that extra bit to hold a carry during a LITTLENUM carry
 631          propagation. Another extra bit (kept 0) will assure us that we
 632          don't get a sticky sign bit after shifting right, and that
 633          permits us to propagate the carry without any masking of bits.
 634          #endif */
 635       for (carry = 1, lp--; carry; lp--)
 636         {
 637           carry = *lp + carry;
 638           *lp = carry;
 639           carry >>= LITTLENUM_NUMBER_OF_BITS;
 640           if (lp == words)
 641             break;
 642         }
 643       if (precision == X_PRECISION && exponent_bits == 15)
 644         {
 645           /* Extended precision numbers have an explicit integer bit
 646              that we may have to restore.  */
 647           if (lp == words)
 648             {
 649 #ifdef TC_M68K
 650               /* On the m68k there is a gap of 16 bits.  We must
 651                  explicitly propagate the carry into the exponent.  */
 652               words[0] += words[1];
 653               words[1] = 0;
 654               lp++;
 655 #endif
 656               /* Put back the integer bit.  */
 657               lp[1] |= 1 << (LITTLENUM_NUMBER_OF_BITS - 1);
 658             }
 659         }
 660       if ((word1 ^ *words) & (1 << (LITTLENUM_NUMBER_OF_BITS - 1)))
 661         {
 662           /* We leave return_value alone: admit we read the number,
 663              but return a floating exception because we can't encode
 664              the number.  */
 665           *words &= ~(1 << (LITTLENUM_NUMBER_OF_BITS - 1));
 666         }
 667     }
 668   return return_value;
 669 }
 670
 671 #ifdef TEST
 672 char *
 673 print_gen (gen)
 674      FLONUM_TYPE *gen;
 675 {
 676   FLONUM_TYPE f;
 677   LITTLENUM_TYPE arr[10];
 678   double dv;
 679   float fv;
 680   static char sbuf[40];
 681
 682   if (gen)
 683     {
 684       f = generic_floating_point_number;
 685       generic_floating_point_number = *gen;
 686     }
 687   gen_to_words (&arr[0], 4, 11);
 688   memcpy (&dv, &arr[0], sizeof (double));
 689   sprintf (sbuf, "%x %x %x %x %.14G   ", arr[0], arr[1], arr[2], arr[3], dv);
 690   gen_to_words (&arr[0], 2, 8);
 691   memcpy (&fv, &arr[0], sizeof (float));
 692   sprintf (sbuf + strlen (sbuf), "%x %x %.12g\n", arr[0], arr[1], fv);
 693
 694   if (gen)
 695     generic_floating_point_number = f;
 696
 697   return (sbuf);
 698 }
 699
 700 #endif