gcc/config/fp-bit.h

   1 /* Header file for fp-bit.c.  */
   2 /* Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files,
  22    some of which are compiled with GCC, to produce an executable,
  23    this library does not by itself cause the resulting executable
  24    to be covered by the GNU General Public License.
  25    This exception does not however invalidate any other reasons why
  26    the executable file might be covered by the GNU General Public License.  */
  27
  28 #ifndef GCC_FP_BIT_H
  29 #define GCC_FP_BIT_H
  30
  31 /* Defining FINE_GRAINED_LIBRARIES allows one to select which routines
  32    from this file are compiled via additional -D options.
  33
  34    This avoids the need to pull in the entire fp emulation library
  35    when only a small number of functions are needed.
  36
  37    If FINE_GRAINED_LIBRARIES is not defined, then compile every
  38    suitable routine.  */
  39 #ifndef FINE_GRAINED_LIBRARIES
  40 #define L_pack_df
  41 #define L_unpack_df
  42 #define L_pack_sf
  43 #define L_unpack_sf
  44 #define L_addsub_sf
  45 #define L_addsub_df
  46 #define L_mul_sf
  47 #define L_mul_df
  48 #define L_div_sf
  49 #define L_div_df
  50 #define L_fpcmp_parts_sf
  51 #define L_fpcmp_parts_df
  52 #define L_compare_sf
  53 #define L_compare_df
  54 #define L_eq_sf
  55 #define L_eq_df
  56 #define L_ne_sf
  57 #define L_ne_df
  58 #define L_gt_sf
  59 #define L_gt_df
  60 #define L_ge_sf
  61 #define L_ge_df
  62 #define L_lt_sf
  63 #define L_lt_df
  64 #define L_le_sf
  65 #define L_le_df
  66 #define L_unord_sf
  67 #define L_unord_df
  68 #define L_usi_to_sf
  69 #define L_usi_to_df
  70 #define L_si_to_sf
  71 #define L_si_to_df
  72 #define L_sf_to_si
  73 #define L_df_to_si
  74 #define L_f_to_usi
  75 #define L_df_to_usi
  76 #define L_negate_sf
  77 #define L_negate_df
  78 #define L_make_sf
  79 #define L_make_df
  80 #define L_sf_to_df
  81 #define L_df_to_sf
  82 #ifdef FLOAT
  83 #define L_thenan_sf
  84 #else
  85 #define L_thenan_df
  86 #endif
  87 #endif /* ! FINE_GRAINED_LIBRARIES */
  88
  89 #if __LDBL_MANT_DIG__ == 113 || __LDBL_MANT_DIG__ == 106
  90 # define TMODES
  91 #endif
  92
  93 typedef float SFtype __attribute__ ((mode (SF)));
  94 typedef float DFtype __attribute__ ((mode (DF)));
  95 #ifdef TMODES
  96 typedef float TFtype __attribute__ ((mode (TF)));
  97 #endif
  98
  99 typedef int HItype __attribute__ ((mode (HI)));
 100 typedef int SItype __attribute__ ((mode (SI)));
 101 typedef int DItype __attribute__ ((mode (DI)));
 102 #ifdef TMODES
 103 typedef int TItype __attribute__ ((mode (TI)));
 104 #endif
 105
 106 /* The type of the result of a fp compare */
 107 #ifndef CMPtype
 108 #define CMPtype SItype
 109 #endif
 110
 111 typedef unsigned int UHItype __attribute__ ((mode (HI)));
 112 typedef unsigned int USItype __attribute__ ((mode (SI)));
 113 typedef unsigned int UDItype __attribute__ ((mode (DI)));
 114 #ifdef TMODES
 115 typedef unsigned int UTItype __attribute__ ((mode (TI)));
 116 #endif
 117
 118 #define MAX_USI_INT  (~(USItype)0)
 119 #define MAX_SI_INT   ((SItype) (MAX_USI_INT >> 1))
 120 #define BITS_PER_SI  (4 * BITS_PER_UNIT)
 121 #ifdef TMODES
 122 #define MAX_UDI_INT  (~(UDItype)0)
 123 #define MAX_DI_INT   ((DItype) (MAX_UDI_INT >> 1))
 124 #define BITS_PER_DI  (8 * BITS_PER_UNIT)
 125 #endif
 126
 127 #ifdef FLOAT_ONLY
 128 #define NO_DI_MODE
 129 #endif
 130
 131 #ifdef TFLOAT
 132 # ifndef TMODES
 133 #  error "TFLOAT requires long double to have 113 bits of mantissa"
 134 # endif
 135
 136 #       define PREFIXFPDP tp
 137 #       define PREFIXSFDF tf
 138 #       define NGARDS 10L /* Is this right? */
 139 #       define GARDROUND 0x1ff
 140 #       define GARDMASK  0x3ff
 141 #       define GARDMSB   0x200
 142 #       define FRAC_NBITS 128
 143
 144 # if __LDBL_MANT_DIG__ == 113 /* IEEE quad */
 145 #       define EXPBITS 15
 146 #       define EXPBIAS 16383
 147 #       define EXPMAX (0x7fff)
 148 #       define QUIET_NAN ((TItype)0x8 << 108)
 149 #       define FRACHIGH  ((TItype)0x8 << 124)
 150 #       define FRACHIGH2 ((TItype)0xc << 124)
 151 #       define FRACBITS 112
 152 # endif
 153
 154 # if __LDBL_MANT_DIG__ == 106 /* IBM extended (double+double) */
 155 #       define EXPBITS 11
 156 #       define EXPBIAS 1023
 157 #       define EXPMAX (0x7ff)
 158 #       define QUIET_NAN ((TItype)0x8 << (48 + 64))
 159 #       define FRACHIGH  ((TItype)0x8 << 124)
 160 #       define FRACHIGH2 ((TItype)0xc << 124)
 161 #       define FRACBITS 105
 162 #       define HALFFRACBITS 52
 163 #       define HALFSHIFT 64
 164 # endif
 165
 166 #       define pack_d __pack_t
 167 #       define unpack_d __unpack_t
 168 #       define __fpcmp_parts __fpcmp_parts_t
 169         typedef UTItype fractype;
 170         typedef UDItype halffractype;
 171         typedef USItype qrtrfractype;
 172 #define qrtrfractype qrtrfractype
 173         typedef TFtype FLO_type;
 174         typedef TItype intfrac;
 175 #elif defined FLOAT
 176 #       define NGARDS    7L
 177 #       define GARDROUND 0x3f
 178 #       define GARDMASK  0x7f
 179 #       define GARDMSB   0x40
 180 #       define EXPBITS 8
 181 #       define EXPBIAS 127
 182 #       define FRACBITS 23
 183 #       define EXPMAX (0xff)
 184 #       define QUIET_NAN 0x100000L
 185 #       define FRAC_NBITS 32
 186 #       define FRACHIGH  0x80000000L
 187 #       define FRACHIGH2 0xc0000000L
 188 #       define pack_d __pack_f
 189 #       define unpack_d __unpack_f
 190 #       define __fpcmp_parts __fpcmp_parts_f
 191         typedef USItype fractype;
 192         typedef UHItype halffractype;
 193         typedef SFtype FLO_type;
 194         typedef SItype intfrac;
 195
 196 #else
 197 #       define PREFIXFPDP dp
 198 #       define PREFIXSFDF df
 199 #       define NGARDS 8L
 200 #       define GARDROUND 0x7f
 201 #       define GARDMASK  0xff
 202 #       define GARDMSB   0x80
 203 #       define EXPBITS 11
 204 #       define EXPBIAS 1023
 205 #       define FRACBITS 52
 206 #       define EXPMAX (0x7ff)
 207 #       define QUIET_NAN 0x8000000000000LL
 208 #       define FRAC_NBITS 64
 209 #       define FRACHIGH  0x8000000000000000LL
 210 #       define FRACHIGH2 0xc000000000000000LL
 211 #       define pack_d __pack_d
 212 #       define unpack_d __unpack_d
 213 #       define __fpcmp_parts __fpcmp_parts_d
 214         typedef UDItype fractype;
 215         typedef USItype halffractype;
 216         typedef DFtype FLO_type;
 217         typedef DItype intfrac;
 218 #endif /* FLOAT */
 219
 220 #ifdef US_SOFTWARE_GOFAST
 221 #       ifdef TFLOAT
 222 #               error "GOFAST TFmode not supported"
 223 #       elif defined FLOAT
 224 #               define add              fpadd
 225 #               define sub              fpsub
 226 #               define multiply         fpmul
 227 #               define divide           fpdiv
 228 #               define compare          fpcmp
 229 #               define _unord_f2        __unordsf2
 230 #               define usi_to_float     __floatunsisf
 231 #               define si_to_float      sitofp
 232 #               define float_to_si      fptosi
 233 #               define float_to_usi     fptoui
 234 #               define negate           __negsf2
 235 #               define sf_to_df         fptodp
 236 #               define sf_to_tf         __extendsftf2
 237 #       else
 238 #               define add              dpadd
 239 #               define sub              dpsub
 240 #               define multiply         dpmul
 241 #               define divide           dpdiv
 242 #               define compare          dpcmp
 243 #               define _unord_f2        __unorddf2
 244 #               define usi_to_float     __floatunsidf
 245 #               define si_to_float      litodp
 246 #               define float_to_si      dptoli
 247 #               define float_to_usi     dptoul
 248 #               define negate           __negdf2
 249 #               define df_to_sf         dptofp
 250 #               define df_to_tf         __extenddftf2
 251 #       endif /* FLOAT */
 252 #else
 253 #       ifdef TFLOAT
 254 #               define add              __addtf3
 255 #               define sub              __subtf3
 256 #               define multiply         __multf3
 257 #               define divide           __divtf3
 258 #               define compare          __cmptf2
 259 #               define _eq_f2           __eqtf2
 260 #               define _ne_f2           __netf2
 261 #               define _gt_f2           __gttf2
 262 #               define _ge_f2           __getf2
 263 #               define _lt_f2           __lttf2
 264 #               define _le_f2           __letf2
 265 #               define _unord_f2        __unordtf2
 266 #               define usi_to_float     __floatunsitf
 267 #               define si_to_float      __floatsitf
 268 #               define float_to_si      __fixtfsi
 269 #               define float_to_usi     __fixunstfsi
 270 #               define negate           __negtf2
 271 #               define tf_to_sf         __trunctfsf2
 272 #               define tf_to_df         __trunctfdf2
 273 #       elif defined FLOAT
 274 #               define add              __addsf3
 275 #               define sub              __subsf3
 276 #               define multiply         __mulsf3
 277 #               define divide           __divsf3
 278 #               define compare          __cmpsf2
 279 #               define _eq_f2           __eqsf2
 280 #               define _ne_f2           __nesf2
 281 #               define _gt_f2           __gtsf2
 282 #               define _ge_f2           __gesf2
 283 #               define _lt_f2           __ltsf2
 284 #               define _le_f2           __lesf2
 285 #               define _unord_f2        __unordsf2
 286 #               define usi_to_float     __floatunsisf
 287 #               define si_to_float      __floatsisf
 288 #               define float_to_si      __fixsfsi
 289 #               define float_to_usi     __fixunssfsi
 290 #               define negate           __negsf2
 291 #               define sf_to_df         __extendsfdf2
 292 #               define sf_to_tf         __extendsftf2
 293 #       else
 294 #               define add              __adddf3
 295 #               define sub              __subdf3
 296 #               define multiply         __muldf3
 297 #               define divide           __divdf3
 298 #               define compare          __cmpdf2
 299 #               define _eq_f2           __eqdf2
 300 #               define _ne_f2           __nedf2
 301 #               define _gt_f2           __gtdf2
 302 #               define _ge_f2           __gedf2
 303 #               define _lt_f2           __ltdf2
 304 #               define _le_f2           __ledf2
 305 #               define _unord_f2        __unorddf2
 306 #               define usi_to_float     __floatunsidf
 307 #               define si_to_float      __floatsidf
 308 #               define float_to_si      __fixdfsi
 309 #               define float_to_usi     __fixunsdfsi
 310 #               define negate           __negdf2
 311 #               define df_to_sf         __truncdfsf2
 312 #               define df_to_tf         __extenddftf2
 313 #       endif /* FLOAT */
 314 #endif /* US_SOFTWARE_GOFAST */
 315
 316 #ifndef INLINE
 317 #define INLINE __inline__
 318 #endif
 319
 320 /* Preserve the sticky-bit when shifting fractions to the right.  */
 321 #define LSHIFT(a, s) { a = (a >> s) | !!(a & (((fractype) 1 << s) - 1)); }
 322
 323 /* numeric parameters */
 324 /* F_D_BITOFF is the number of bits offset between the MSB of the mantissa
 325    of a float and of a double. Assumes there are only two float types.
 326    (double::FRAC_BITS+double::NGARDS-(float::FRAC_BITS-float::NGARDS))
 327  */
 328 #define F_D_BITOFF (52+8-(23+7))
 329
 330 #ifdef TMODES
 331 # define F_T_BITOFF (__LDBL_MANT_DIG__-1+10-(23+7))
 332 # define D_T_BITOFF (__LDBL_MANT_DIG__-1+10-(52+8))
 333 #endif
 334
 335
 336 #define NORMAL_EXPMIN (-(EXPBIAS)+1)
 337 #define IMPLICIT_1 ((fractype)1<<(FRACBITS+NGARDS))
 338 #define IMPLICIT_2 ((fractype)1<<(FRACBITS+1+NGARDS))
 339
 340 /* common types */
 341
 342 typedef enum
 343 {
 344   CLASS_SNAN,
 345   CLASS_QNAN,
 346   CLASS_ZERO,
 347   CLASS_NUMBER,
 348   CLASS_INFINITY
 349 } fp_class_type;
 350
 351 typedef struct
 352 {
 353 #ifdef SMALL_MACHINE
 354   char class;
 355   unsigned char sign;
 356   short normal_exp;
 357 #else
 358   fp_class_type class;
 359   unsigned int sign;
 360   int normal_exp;
 361 #endif
 362
 363   union
 364     {
 365       fractype ll;
 366       halffractype l[2];
 367     } fraction;
 368 } fp_number_type;
 369
 370 typedef union
 371 {
 372   FLO_type value;
 373   fractype value_raw;
 374
 375 #ifndef FLOAT
 376 # ifdef qrtrfractype
 377   qrtrfractype qwords[4];
 378 # else
 379   halffractype words[2];
 380 # endif
 381 #endif
 382
 383 #ifdef FLOAT_BIT_ORDER_MISMATCH
 384   struct
 385     {
 386       fractype fraction:FRACBITS __attribute__ ((packed));
 387       unsigned int exp:EXPBITS __attribute__ ((packed));
 388       unsigned int sign:1 __attribute__ ((packed));
 389     }
 390   bits;
 391 #endif
 392
 393 #ifdef _DEBUG_BITFLOAT
 394   struct
 395     {
 396       unsigned int sign:1 __attribute__ ((packed));
 397       unsigned int exp:EXPBITS __attribute__ ((packed));
 398       fractype fraction:FRACBITS __attribute__ ((packed));
 399     }
 400   bits_big_endian;
 401
 402   struct
 403     {
 404       fractype fraction:FRACBITS __attribute__ ((packed));
 405       unsigned int exp:EXPBITS __attribute__ ((packed));
 406       unsigned int sign:1 __attribute__ ((packed));
 407     }
 408   bits_little_endian;
 409 #endif
 410 }
 411 FLO_union_type;
 412
 413 /* Prototypes */
 414
 415 #if defined(L_pack_df) || defined(L_pack_sf) || defined(L_pack_tf)
 416 extern FLO_type pack_d (fp_number_type *);
 417 #endif
 418
 419 extern void unpack_d (FLO_union_type *, fp_number_type *);
 420
 421 #if defined(L_addsub_sf) || defined(L_addsub_df) || defined(L_addsub_tf)
 422 extern FLO_type add (FLO_type, FLO_type);
 423 extern FLO_type sub (FLO_type, FLO_type);
 424 #endif
 425
 426 #if defined(L_mul_sf) || defined(L_mul_df) || defined(L_mul_tf)
 427 extern FLO_type multiply (FLO_type, FLO_type);
 428 #endif
 429
 430 #if defined(L_div_sf) || defined(L_div_df) || defined(L_div_tf)
 431 extern FLO_type divide (FLO_type, FLO_type);
 432 #endif
 433
 434 extern int __fpcmp_parts (fp_number_type *, fp_number_type *);
 435
 436 #if defined(L_compare_sf) || defined(L_compare_df) || defined(L_compare_tf)
 437 extern CMPtype compare (FLO_type, FLO_type);
 438 #endif
 439
 440 #ifndef US_SOFTWARE_GOFAST
 441
 442 #if defined(L_eq_sf) || defined(L_eq_df) || defined(L_eq_tf)
 443 extern CMPtype _eq_f2 (FLO_type, FLO_type);
 444 #endif
 445
 446 #if defined(L_ne_sf) || defined(L_ne_df) || defined(L_ne_tf)
 447 extern CMPtype _ne_f2 (FLO_type, FLO_type);
 448 #endif
 449
 450 #if defined(L_gt_sf) || defined(L_gt_df) || defined(L_gt_tf)
 451 extern CMPtype _gt_f2 (FLO_type, FLO_type);
 452 #endif
 453
 454 #if defined(L_ge_sf) || defined(L_ge_df) || defined(L_ge_tf)
 455 extern CMPtype _ge_f2 (FLO_type, FLO_type);
 456 #endif
 457
 458 #if defined(L_lt_sf) || defined(L_lt_df) || defined(L_lt_tf)
 459 extern CMPtype _lt_f2 (FLO_type, FLO_type);
 460 #endif
 461
 462 #if defined(L_le_sf) || defined(L_le_df) || defined(L_le_tf)
 463 extern CMPtype _le_f2 (FLO_type, FLO_type);
 464 #endif
 465
 466 #if defined(L_unord_sf) || defined(L_unord_df) || defined(L_unord_tf)
 467 extern CMPtype _unord_f2 (FLO_type, FLO_type);
 468 #endif
 469
 470 #endif /* ! US_SOFTWARE_GOFAST */
 471
 472 #if defined(L_si_to_sf) || defined(L_si_to_df) || defined(L_si_to_tf)
 473 extern FLO_type si_to_float (SItype);
 474 #endif
 475
 476 #if defined(L_sf_to_si) || defined(L_df_to_si) || defined(L_tf_to_si)
 477 extern SItype float_to_si (FLO_type);
 478 #endif
 479
 480 #if defined(L_sf_to_usi) || defined(L_df_to_usi) || defined(L_tf_to_usi)
 481 #if defined(US_SOFTWARE_GOFAST) || defined(L_tf_to_usi)
 482 extern USItype float_to_usi (FLO_type);
 483 #endif
 484 #endif
 485
 486 #if defined(L_usi_to_sf) || defined(L_usi_to_df) || defined(L_usi_to_tf)
 487 extern FLO_type usi_to_float (USItype);
 488 #endif
 489
 490 #if defined(L_negate_sf) || defined(L_negate_df) || defined(L_negate_tf)
 491 extern FLO_type negate (FLO_type);
 492 #endif
 493
 494 #ifdef FLOAT
 495 #if defined(L_make_sf)
 496 extern SFtype __make_fp (fp_class_type, unsigned int, int, USItype);
 497 #endif
 498 #ifndef FLOAT_ONLY
 499 extern DFtype __make_dp (fp_class_type, unsigned int, int, UDItype);
 500 #if defined(L_sf_to_df)
 501 extern DFtype sf_to_df (SFtype);
 502 #endif
 503 #if defined(L_sf_to_tf) && defined(TMODES)
 504 extern TFtype sf_to_tf (SFtype);
 505 #endif
 506 #endif /* ! FLOAT_ONLY */
 507 #endif /* FLOAT */
 508
 509 #ifndef FLOAT
 510 extern SFtype __make_fp (fp_class_type, unsigned int, int, USItype);
 511 #if defined(L_make_df)
 512 extern DFtype __make_dp (fp_class_type, unsigned int, int, UDItype);
 513 #endif
 514 #if defined(L_df_to_sf)
 515 extern SFtype df_to_sf (DFtype);
 516 #endif
 517 #if defined(L_df_to_tf) && defined(TMODES)
 518 extern TFtype df_to_tf (DFtype);
 519 #endif
 520 #endif /* ! FLOAT */
 521
 522 #ifdef TMODES
 523 extern DFtype __make_dp (fp_class_type, unsigned int, int, UDItype);
 524 extern TFtype __make_tp (fp_class_type, unsigned int, int, UTItype);
 525 #ifdef TFLOAT
 526 #if defined(L_tf_to_sf)
 527 extern SFtype tf_to_sf (TFtype);
 528 #endif
 529 #if defined(L_tf_to_df)
 530 extern DFtype tf_to_df (TFtype);
 531 #endif
 532 #if defined(L_di_to_tf)
 533 extern TFtype di_to_df (DItype);
 534 #endif
 535 #endif /* TFLOAT */
 536 #endif /* TMODES */
 537
 538 #endif /* ! GCC_FP_BIT_H */