gcc/config/fp-bit.h

   1 /* Header file for fp-bit.c.  */
   2 /* Copyright (C) 2000, 2002, 2003, 2006, 2009, 2010
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef GCC_FP_BIT_H
  27 #define GCC_FP_BIT_H
  28
  29 /* Defining FINE_GRAINED_LIBRARIES allows one to select which routines
  30    from this file are compiled via additional -D options.
  31
  32    This avoids the need to pull in the entire fp emulation library
  33    when only a small number of functions are needed.
  34
  35    If FINE_GRAINED_LIBRARIES is not defined, then compile every
  36    suitable routine.  */
  37 #ifndef FINE_GRAINED_LIBRARIES
  38 #define L_pack_df
  39 #define L_unpack_df
  40 #define L_pack_sf
  41 #define L_unpack_sf
  42 #define L_addsub_sf
  43 #define L_addsub_df
  44 #define L_mul_sf
  45 #define L_mul_df
  46 #define L_div_sf
  47 #define L_div_df
  48 #define L_fpcmp_parts_sf
  49 #define L_fpcmp_parts_df
  50 #define L_compare_sf
  51 #define L_compare_df
  52 #define L_eq_sf
  53 #define L_eq_df
  54 #define L_ne_sf
  55 #define L_ne_df
  56 #define L_gt_sf
  57 #define L_gt_df
  58 #define L_ge_sf
  59 #define L_ge_df
  60 #define L_lt_sf
  61 #define L_lt_df
  62 #define L_le_sf
  63 #define L_le_df
  64 #define L_unord_sf
  65 #define L_unord_df
  66 #define L_usi_to_sf
  67 #define L_usi_to_df
  68 #define L_si_to_sf
  69 #define L_si_to_df
  70 #define L_sf_to_si
  71 #define L_df_to_si
  72 #define L_f_to_usi
  73 #define L_df_to_usi
  74 #define L_negate_sf
  75 #define L_negate_df
  76 #define L_make_sf
  77 #define L_make_df
  78 #define L_sf_to_df
  79 #define L_df_to_sf
  80 #ifdef FLOAT
  81 #define L_thenan_sf
  82 #else
  83 #define L_thenan_df
  84 #endif
  85 #endif /* ! FINE_GRAINED_LIBRARIES */
  86
  87 #if __LDBL_MANT_DIG__ == 113 || __LDBL_MANT_DIG__ == 106
  88 # if defined(TFLOAT) || defined(L_sf_to_tf) || defined(L_df_to_tf)
  89 #  define TMODES
  90 # endif
  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 floating point comparison.  This must
 107    match `__libgcc_cmp_return__' in GCC for the target.  */
 108 #ifndef CMPtype
 109 typedef int CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
 110 #endif
 111
 112 typedef unsigned int UHItype __attribute__ ((mode (HI)));
 113 typedef unsigned int USItype __attribute__ ((mode (SI)));
 114 typedef unsigned int UDItype __attribute__ ((mode (DI)));
 115 #ifdef TMODES
 116 typedef unsigned int UTItype __attribute__ ((mode (TI)));
 117 #endif
 118
 119 #define MAX_USI_INT  (~(USItype)0)
 120 #define MAX_SI_INT   ((SItype) (MAX_USI_INT >> 1))
 121 #define BITS_PER_SI  (4 * BITS_PER_UNIT)
 122 #ifdef TMODES
 123 #define MAX_UDI_INT  (~(UDItype)0)
 124 #define MAX_DI_INT   ((DItype) (MAX_UDI_INT >> 1))
 125 #define BITS_PER_DI  (8 * BITS_PER_UNIT)
 126 #endif
 127
 128 #ifdef FLOAT_ONLY
 129 #define NO_DI_MODE
 130 #endif
 131
 132 #ifdef TFLOAT
 133 # ifndef TMODES
 134 #  error "TFLOAT requires long double to have 113 bits of mantissa"
 135 # endif
 136
 137 #       define PREFIXFPDP tp
 138 #       define PREFIXSFDF tf
 139 #       define NGARDS 10L /* Is this right? */
 140 #       define GARDROUND 0x1ff
 141 #       define GARDMASK  0x3ff
 142 #       define GARDMSB   0x200
 143 #       define FRAC_NBITS 128
 144
 145 # if __LDBL_MANT_DIG__ == 113 /* IEEE quad */
 146 #       define EXPBITS 15
 147 #       define EXPBIAS 16383
 148 #       define EXPMAX (0x7fff)
 149 #       define QUIET_NAN ((TItype)0x8 << 108)
 150 #       define FRACHIGH  ((TItype)0x8 << 124)
 151 #       define FRACHIGH2 ((TItype)0xc << 124)
 152 #       define FRACBITS 112
 153 # endif
 154
 155 # if __LDBL_MANT_DIG__ == 106 /* IBM extended (double+double) */
 156 #       define EXPBITS 11
 157 #       define EXPBIAS 1023
 158 #       define EXPMAX (0x7ff)
 159 #       define QUIET_NAN ((TItype)0x8 << (48 + 64))
 160 #       define FRACHIGH  ((TItype)0x8 << 124)
 161 #       define FRACHIGH2 ((TItype)0xc << 124)
 162 #       define FRACBITS 105
 163 #       define HALFFRACBITS 52
 164 #       define HALFSHIFT 64
 165 # endif
 166
 167 #       define pack_d __pack_t
 168 #       define unpack_d __unpack_t
 169 #       define __fpcmp_parts __fpcmp_parts_t
 170         typedef UTItype fractype;
 171         typedef UDItype halffractype;
 172         typedef USItype qrtrfractype;
 173 #define qrtrfractype qrtrfractype
 174         typedef TFtype FLO_type;
 175         typedef TItype intfrac;
 176 #elif defined FLOAT
 177 #       define NGARDS    7L
 178 #       define GARDROUND 0x3f
 179 #       define GARDMASK  0x7f
 180 #       define GARDMSB   0x40
 181 #       define EXPBITS 8
 182 #       define EXPBIAS 127
 183 #       define FRACBITS 23
 184 #       define EXPMAX (0xff)
 185 #       define QUIET_NAN 0x100000L
 186 #       define FRAC_NBITS 32
 187 #       define FRACHIGH  0x80000000L
 188 #       define FRACHIGH2 0xc0000000L
 189 #       define pack_d __pack_f
 190 #       define unpack_d __unpack_f
 191 #       define __fpcmp_parts __fpcmp_parts_f
 192         typedef USItype fractype;
 193         typedef UHItype halffractype;
 194         typedef SFtype FLO_type;
 195         typedef SItype intfrac;
 196
 197 #else
 198 #       define PREFIXFPDP dp
 199 #       define PREFIXSFDF df
 200 #       define NGARDS 8L
 201 #       define GARDROUND 0x7f
 202 #       define GARDMASK  0xff
 203 #       define GARDMSB   0x80
 204 #       define EXPBITS 11
 205 #       define EXPBIAS 1023
 206 #       define FRACBITS 52
 207 #       define EXPMAX (0x7ff)
 208 #       define QUIET_NAN 0x8000000000000LL
 209 #       define FRAC_NBITS 64
 210 #       define FRACHIGH  0x8000000000000000LL
 211 #       define FRACHIGH2 0xc000000000000000LL
 212 #       define pack_d __pack_d
 213 #       define unpack_d __unpack_d
 214 #       define __fpcmp_parts __fpcmp_parts_d
 215         typedef UDItype fractype;
 216         typedef USItype halffractype;
 217         typedef DFtype FLO_type;
 218         typedef DItype intfrac;
 219 #endif /* FLOAT */
 220
 221 #ifdef TFLOAT
 222 #       define add              __addtf3
 223 #       define sub              __subtf3
 224 #       define multiply         __multf3
 225 #       define divide           __divtf3
 226 #       define compare          __cmptf2
 227 #       define _eq_f2           __eqtf2
 228 #       define _ne_f2           __netf2
 229 #       define _gt_f2           __gttf2
 230 #       define _ge_f2           __getf2
 231 #       define _lt_f2           __lttf2
 232 #       define _le_f2           __letf2
 233 #       define _unord_f2        __unordtf2
 234 #       define usi_to_float     __floatunsitf
 235 #       define si_to_float      __floatsitf
 236 #       define float_to_si      __fixtfsi
 237 #       define float_to_usi     __fixunstfsi
 238 #       define negate           __negtf2
 239 #       define tf_to_sf         __trunctfsf2
 240 #       define tf_to_df         __trunctfdf2
 241 #elif defined FLOAT
 242 #       define add              __addsf3
 243 #       define sub              __subsf3
 244 #       define multiply         __mulsf3
 245 #       define divide           __divsf3
 246 #       define compare          __cmpsf2
 247 #       define _eq_f2           __eqsf2
 248 #       define _ne_f2           __nesf2
 249 #       define _gt_f2           __gtsf2
 250 #       define _ge_f2           __gesf2
 251 #       define _lt_f2           __ltsf2
 252 #       define _le_f2           __lesf2
 253 #       define _unord_f2        __unordsf2
 254 #       define usi_to_float     __floatunsisf
 255 #       define si_to_float      __floatsisf
 256 #       define float_to_si      __fixsfsi
 257 #       define float_to_usi     __fixunssfsi
 258 #       define negate           __negsf2
 259 #       define sf_to_df         __extendsfdf2
 260 #       define sf_to_tf         __extendsftf2
 261 #else
 262 #       define add              __adddf3
 263 #       define sub              __subdf3
 264 #       define multiply         __muldf3
 265 #       define divide           __divdf3
 266 #       define compare          __cmpdf2
 267 #       define _eq_f2           __eqdf2
 268 #       define _ne_f2           __nedf2
 269 #       define _gt_f2           __gtdf2
 270 #       define _ge_f2           __gedf2
 271 #       define _lt_f2           __ltdf2
 272 #       define _le_f2           __ledf2
 273 #       define _unord_f2        __unorddf2
 274 #       define usi_to_float     __floatunsidf
 275 #       define si_to_float      __floatsidf
 276 #       define float_to_si      __fixdfsi
 277 #       define float_to_usi     __fixunsdfsi
 278 #       define negate           __negdf2
 279 #       define df_to_sf         __truncdfsf2
 280 #       define df_to_tf         __extenddftf2
 281 #endif /* FLOAT */
 282
 283 #ifndef INLINE
 284 #define INLINE __inline__
 285 #endif
 286
 287 /* Preserve the sticky-bit when shifting fractions to the right.  */
 288 #define LSHIFT(a, s) { a = (a >> s) | !!(a & (((fractype) 1 << s) - 1)); }
 289
 290 /* numeric parameters */
 291 /* F_D_BITOFF is the number of bits offset between the MSB of the mantissa
 292    of a float and of a double. Assumes there are only two float types.
 293    (double::FRAC_BITS+double::NGARDS-(float::FRAC_BITS-float::NGARDS))
 294  */
 295 #define F_D_BITOFF (52+8-(23+7))
 296
 297 #ifdef TMODES
 298 # define F_T_BITOFF (__LDBL_MANT_DIG__-1+10-(23+7))
 299 # define D_T_BITOFF (__LDBL_MANT_DIG__-1+10-(52+8))
 300 #endif
 301
 302
 303 #define NORMAL_EXPMIN (-(EXPBIAS)+1)
 304 #define IMPLICIT_1 ((fractype)1<<(FRACBITS+NGARDS))
 305 #define IMPLICIT_2 ((fractype)1<<(FRACBITS+1+NGARDS))
 306
 307 /* common types */
 308
 309 typedef enum
 310 {
 311   CLASS_SNAN,
 312   CLASS_QNAN,
 313   CLASS_ZERO,
 314   CLASS_NUMBER,
 315   CLASS_INFINITY
 316 } fp_class_type;
 317
 318 typedef struct
 319 {
 320 #ifdef SMALL_MACHINE
 321   char class;
 322   unsigned char sign;
 323   short normal_exp;
 324 #else
 325   fp_class_type class;
 326   unsigned int sign;
 327   int normal_exp;
 328 #endif
 329
 330   union
 331     {
 332       fractype ll;
 333       halffractype l[2];
 334     } fraction;
 335 } fp_number_type;
 336
 337 typedef union
 338 {
 339   FLO_type value;
 340   fractype value_raw;
 341
 342 #ifndef FLOAT
 343 # ifdef qrtrfractype
 344   qrtrfractype qwords[4];
 345 # else
 346   halffractype words[2];
 347 # endif
 348 #endif
 349
 350 #ifdef FLOAT_BIT_ORDER_MISMATCH
 351   struct
 352     {
 353       fractype fraction:FRACBITS __attribute__ ((packed));
 354       unsigned int exp:EXPBITS __attribute__ ((packed));
 355       unsigned int sign:1 __attribute__ ((packed));
 356     }
 357   bits;
 358 #endif
 359
 360 #ifdef _DEBUG_BITFLOAT
 361   struct
 362     {
 363       unsigned int sign:1 __attribute__ ((packed));
 364       unsigned int exp:EXPBITS __attribute__ ((packed));
 365       fractype fraction:FRACBITS __attribute__ ((packed));
 366     }
 367   bits_big_endian;
 368
 369   struct
 370     {
 371       fractype fraction:FRACBITS __attribute__ ((packed));
 372       unsigned int exp:EXPBITS __attribute__ ((packed));
 373       unsigned int sign:1 __attribute__ ((packed));
 374     }
 375   bits_little_endian;
 376 #endif
 377 }
 378 FLO_union_type;
 379
 380 /* Prototypes.  */
 381
 382 #if defined(L_pack_df) || defined(L_pack_sf) || defined(L_pack_tf)
 383 extern FLO_type pack_d (const fp_number_type *);
 384 #endif
 385
 386 extern void unpack_d (FLO_union_type *, fp_number_type *);
 387
 388 #if defined(L_addsub_sf) || defined(L_addsub_df) || defined(L_addsub_tf)
 389 extern FLO_type add (FLO_type, FLO_type);
 390 extern FLO_type sub (FLO_type, FLO_type);
 391 #endif
 392
 393 #if defined(L_mul_sf) || defined(L_mul_df) || defined(L_mul_tf)
 394 extern FLO_type multiply (FLO_type, FLO_type);
 395 #endif
 396
 397 #if defined(L_div_sf) || defined(L_div_df) || defined(L_div_tf)
 398 extern FLO_type divide (FLO_type, FLO_type);
 399 #endif
 400
 401 extern int __fpcmp_parts (fp_number_type *, fp_number_type *);
 402
 403 #if defined(L_compare_sf) || defined(L_compare_df) || defined(L_compare_tf)
 404 extern CMPtype compare (FLO_type, FLO_type);
 405 #endif
 406
 407 #if defined(L_eq_sf) || defined(L_eq_df) || defined(L_eq_tf)
 408 extern CMPtype _eq_f2 (FLO_type, FLO_type);
 409 #endif
 410
 411 #if defined(L_ne_sf) || defined(L_ne_df) || defined(L_ne_tf)
 412 extern CMPtype _ne_f2 (FLO_type, FLO_type);
 413 #endif
 414
 415 #if defined(L_gt_sf) || defined(L_gt_df) || defined(L_gt_tf)
 416 extern CMPtype _gt_f2 (FLO_type, FLO_type);
 417 #endif
 418
 419 #if defined(L_ge_sf) || defined(L_ge_df) || defined(L_ge_tf)
 420 extern CMPtype _ge_f2 (FLO_type, FLO_type);
 421 #endif
 422
 423 #if defined(L_lt_sf) || defined(L_lt_df) || defined(L_lt_tf)
 424 extern CMPtype _lt_f2 (FLO_type, FLO_type);
 425 #endif
 426
 427 #if defined(L_le_sf) || defined(L_le_df) || defined(L_le_tf)
 428 extern CMPtype _le_f2 (FLO_type, FLO_type);
 429 #endif
 430
 431 #if defined(L_unord_sf) || defined(L_unord_df) || defined(L_unord_tf)
 432 extern CMPtype _unord_f2 (FLO_type, FLO_type);
 433 #endif
 434
 435 #if defined(L_si_to_sf) || defined(L_si_to_df) || defined(L_si_to_tf)
 436 extern FLO_type si_to_float (SItype);
 437 #endif
 438
 439 #if defined(L_sf_to_si) || defined(L_df_to_si) || defined(L_tf_to_si)
 440 extern SItype float_to_si (FLO_type);
 441 #endif
 442
 443 #if defined(L_tf_to_usi)
 444 extern USItype float_to_usi (FLO_type);
 445 #endif
 446
 447 #if defined(L_usi_to_sf) || defined(L_usi_to_df) || defined(L_usi_to_tf)
 448 extern FLO_type usi_to_float (USItype);
 449 #endif
 450
 451 #if defined(L_negate_sf) || defined(L_negate_df) || defined(L_negate_tf)
 452 extern FLO_type negate (FLO_type);
 453 #endif
 454
 455 #ifdef FLOAT
 456 #if defined(L_make_sf)
 457 extern SFtype __make_fp (fp_class_type, unsigned int, int, USItype);
 458 #endif
 459 #ifndef FLOAT_ONLY
 460 extern DFtype __make_dp (fp_class_type, unsigned int, int, UDItype);
 461 #if defined(L_sf_to_df)
 462 extern DFtype sf_to_df (SFtype);
 463 #endif
 464 #if defined(L_sf_to_tf) && defined(TMODES)
 465 extern TFtype sf_to_tf (SFtype);
 466 #endif
 467 #endif /* ! FLOAT_ONLY */
 468 #endif /* FLOAT */
 469
 470 #ifndef FLOAT
 471 extern SFtype __make_fp (fp_class_type, unsigned int, int, USItype);
 472 #if defined(L_make_df)
 473 extern DFtype __make_dp (fp_class_type, unsigned int, int, UDItype);
 474 #endif
 475 #if defined(L_df_to_sf)
 476 extern SFtype df_to_sf (DFtype);
 477 #endif
 478 #if defined(L_df_to_tf) && defined(TMODES)
 479 extern TFtype df_to_tf (DFtype);
 480 #endif
 481 #endif /* ! FLOAT */
 482
 483 #ifdef TMODES
 484 extern DFtype __make_dp (fp_class_type, unsigned int, int, UDItype);
 485 extern TFtype __make_tp (fp_class_type, unsigned int, int, UTItype);
 486 #ifdef TFLOAT
 487 #if defined(L_tf_to_sf)
 488 extern SFtype tf_to_sf (TFtype);
 489 #endif
 490 #if defined(L_tf_to_df)
 491 extern DFtype tf_to_df (TFtype);
 492 #endif
 493 #if defined(L_di_to_tf)
 494 extern TFtype di_to_df (DItype);
 495 #endif
 496 #endif /* TFLOAT */
 497 #endif /* TMODES */
 498
 499 #endif /* ! GCC_FP_BIT_H */