gcc/real.h

   1 /* Definitions of floating-point access for GNU compiler.
   2    Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
   3    2000, 2002, 2003, 2004, 2005, 2007, 2008 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    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_REAL_H
  22 #define GCC_REAL_H
  23
  24 #ifndef GENERATOR_FILE
  25 #include <gmp.h>
  26 #include <mpfr.h>
  27 #ifdef HAVE_mpc
  28 #include <mpc.h>
  29 # ifdef HAVE_mpc
  30 extern tree do_mpc_arg2 (tree, tree, tree, int, int (*)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t));
  31 # endif
  32 # if MPC_VERSION >= MPC_VERSION_NUM(0,6,1)
  33 #  define HAVE_mpc_pow
  34 # endif
  35 # if MPC_VERSION >= MPC_VERSION_NUM(0,7,1)
  36 #  define HAVE_mpc_arc
  37 # endif
  38 #endif
  39 #endif
  40 #include "machmode.h"
  41
  42 /* An expanded form of the represented number.  */
  43
  44 /* Enumerate the special cases of numbers that we encounter.  */
  45 enum real_value_class {
  46   rvc_zero,
  47   rvc_normal,
  48   rvc_inf,
  49   rvc_nan
  50 };
  51
  52 #define SIGNIFICAND_BITS        (128 + HOST_BITS_PER_LONG)
  53 #define EXP_BITS                (32 - 6)
  54 #define MAX_EXP                 ((1 << (EXP_BITS - 1)) - 1)
  55 #define SIGSZ                   (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
  56 #define SIG_MSB                 ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
  57
  58 struct GTY(()) real_value {
  59   /* Use the same underlying type for all bit-fields, so as to make
  60      sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
  61      be miscomputed.  */
  62   unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
  63   unsigned int decimal : 1;
  64   unsigned int sign : 1;
  65   unsigned int signalling : 1;
  66   unsigned int canonical : 1;
  67   unsigned int uexp : EXP_BITS;
  68   unsigned long sig[SIGSZ];
  69 };
  70
  71 #define REAL_EXP(REAL) \
  72   ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
  73    - (1 << (EXP_BITS - 1)))
  74 #define SET_REAL_EXP(REAL, EXP) \
  75   ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
  76
  77 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
  78    needs to be a macro.  We do need to continue to have a structure tag
  79    so that other headers can forward declare it.  */
  80 #define REAL_VALUE_TYPE struct real_value
  81
  82 /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
  83    consecutive "w" slots.  Moreover, we've got to compute the number of "w"
  84    slots at preprocessor time, which means we can't use sizeof.  Guess.  */
  85
  86 #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
  87 #define REAL_WIDTH \
  88   (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
  89    + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
  90
  91 /* Verify the guess.  */
  92 extern char test_real_width
  93   [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
  94
  95 /* Calculate the format for CONST_DOUBLE.  We need as many slots as
  96    are necessary to overlay a REAL_VALUE_TYPE on them.  This could be
  97    as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
  98
  99    A number of places assume that there are always at least two 'w'
 100    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
 101
 102 #if REAL_WIDTH == 1
 103 # define CONST_DOUBLE_FORMAT     "ww"
 104 #else
 105 # if REAL_WIDTH == 2
 106 #  define CONST_DOUBLE_FORMAT    "ww"
 107 # else
 108 #  if REAL_WIDTH == 3
 109 #   define CONST_DOUBLE_FORMAT   "www"
 110 #  else
 111 #   if REAL_WIDTH == 4
 112 #    define CONST_DOUBLE_FORMAT  "wwww"
 113 #   else
 114 #    if REAL_WIDTH == 5
 115 #     define CONST_DOUBLE_FORMAT "wwwww"
 116 #    else
 117 #     if REAL_WIDTH == 6
 118 #      define CONST_DOUBLE_FORMAT "wwwwww"
 119 #     else
 120        #error "REAL_WIDTH > 6 not supported"
 121 #     endif
 122 #    endif
 123 #   endif
 124 #  endif
 125 # endif
 126 #endif
 127
 128
 129 /* Describes the properties of the specific target format in use.  */
 130 struct real_format
 131 {
 132   /* Move to and from the target bytes.  */
 133   void (*encode) (const struct real_format *, long *,
 134                   const REAL_VALUE_TYPE *);
 135   void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
 136                   const long *);
 137
 138   /* The radix of the exponent and digits of the significand.  */
 139   int b;
 140
 141   /* Size of the significand in digits of radix B.  */
 142   int p;
 143
 144   /* Size of the significant of a NaN, in digits of radix B.  */
 145   int pnan;
 146
 147   /* The minimum negative integer, x, such that b**(x-1) is normalized.  */
 148   int emin;
 149
 150   /* The maximum integer, x, such that b**(x-1) is representable.  */
 151   int emax;
 152
 153   /* The bit position of the sign bit, for determining whether a value
 154      is positive/negative, or -1 for a complex encoding.  */
 155   int signbit_ro;
 156
 157   /* The bit position of the sign bit, for changing the sign of a number,
 158      or -1 for a complex encoding.  */
 159   int signbit_rw;
 160
 161   /* Default rounding mode for operations on this format.  */
 162   bool round_towards_zero;
 163   bool has_sign_dependent_rounding;
 164
 165   /* Properties of the format.  */
 166   bool has_nans;
 167   bool has_inf;
 168   bool has_denorm;
 169   bool has_signed_zero;
 170   bool qnan_msb_set;
 171   bool canonical_nan_lsbs_set;
 172 };
 173
 174
 175 /* The target format used for each floating point mode.
 176    Float modes are followed by decimal float modes, with entries for
 177    float modes indexed by (MODE - first float mode), and entries for
 178    decimal float modes indexed by (MODE - first decimal float mode) +
 179    the number of float modes.  */
 180 extern const struct real_format *
 181   real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1
 182                        + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1];
 183
 184 #define REAL_MODE_FORMAT(MODE)                                          \
 185   (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE)                     \
 186                         ? (((MODE) - MIN_MODE_DECIMAL_FLOAT)            \
 187                            + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1))     \
 188                         : ((MODE) - MIN_MODE_FLOAT)])
 189
 190 #define FLOAT_MODE_FORMAT(MODE) \
 191   (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \
 192                                                : GET_MODE_INNER (MODE)))
 193
 194 /* The following macro determines whether the floating point format is
 195    composite, i.e. may contain non-consecutive mantissa bits, in which
 196    case compile-time FP overflow may not model run-time overflow.  */
 197 #define MODE_COMPOSITE_P(MODE) \
 198   (FLOAT_MODE_P (MODE) \
 199    && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p)
 200
 201 /* Accessor macros for format properties.  */
 202 #define MODE_HAS_NANS(MODE) \
 203   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans)
 204 #define MODE_HAS_INFINITIES(MODE) \
 205   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf)
 206 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 207   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero)
 208 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
 209   (FLOAT_MODE_P (MODE) \
 210    && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
 211
 212
 213 /* Declare functions in real.c.  */
 214
 215 /* Binary or unary arithmetic on tree_code.  */
 216 extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
 217                              const REAL_VALUE_TYPE *);
 218
 219 /* Compare reals by tree_code.  */
 220 extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 221
 222 /* Determine whether a floating-point value X is infinite.  */
 223 extern bool real_isinf (const REAL_VALUE_TYPE *);
 224
 225 /* Determine whether a floating-point value X is a NaN.  */
 226 extern bool real_isnan (const REAL_VALUE_TYPE *);
 227
 228 /* Determine whether a floating-point value X is finite.  */
 229 extern bool real_isfinite (const REAL_VALUE_TYPE *);
 230
 231 /* Determine whether a floating-point value X is negative.  */
 232 extern bool real_isneg (const REAL_VALUE_TYPE *);
 233
 234 /* Determine whether a floating-point value X is minus zero.  */
 235 extern bool real_isnegzero (const REAL_VALUE_TYPE *);
 236
 237 /* Compare two floating-point objects for bitwise identity.  */
 238 extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 239
 240 /* Extend or truncate to a new mode.  */
 241 extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode,
 242                           const REAL_VALUE_TYPE *);
 243
 244 /* Return true if truncating to NEW is exact.  */
 245 extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *);
 246
 247 /* Render R as a decimal floating point constant.  */
 248 extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
 249                              size_t, int);
 250
 251 /* Render R as a decimal floating point constant, rounded so as to be
 252    parsed back to the same value when interpreted in mode MODE.  */
 253 extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t,
 254                                       size_t, int, enum machine_mode);
 255
 256 /* Render R as a hexadecimal floating point constant.  */
 257 extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
 258                                  size_t, size_t, int);
 259
 260 /* Render R as an integer.  */
 261 extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
 262 extern void real_to_integer2 (HOST_WIDE_INT *, HOST_WIDE_INT *,
 263                               const REAL_VALUE_TYPE *);
 264
 265 /* Initialize R from a decimal or hexadecimal string.  Return -1 if
 266    the value underflows, +1 if overflows, and 0 otherwise.  */
 267 extern int real_from_string (REAL_VALUE_TYPE *, const char *);
 268 /* Wrapper to allow different internal representation for decimal floats. */
 269 extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, enum machine_mode);
 270
 271 /* Initialize R from an integer pair HIGH/LOW.  */
 272 extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode,
 273                                unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
 274
 275 extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *,
 276                                 const struct real_format *);
 277 extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode);
 278
 279 extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *,
 280                                   const struct real_format *);
 281 extern void real_from_target (REAL_VALUE_TYPE *, const long *,
 282                               enum machine_mode);
 283
 284 extern void real_inf (REAL_VALUE_TYPE *);
 285
 286 extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
 287
 288 extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
 289
 290 extern void real_2expN (REAL_VALUE_TYPE *, int, enum machine_mode);
 291
 292 extern unsigned int real_hash (const REAL_VALUE_TYPE *);
 293
 294
 295 /* Target formats defined in real.c.  */
 296 extern const struct real_format ieee_single_format;
 297 extern const struct real_format mips_single_format;
 298 extern const struct real_format motorola_single_format;
 299 extern const struct real_format spu_single_format;
 300 extern const struct real_format ieee_double_format;
 301 extern const struct real_format mips_double_format;
 302 extern const struct real_format motorola_double_format;
 303 extern const struct real_format ieee_extended_motorola_format;
 304 extern const struct real_format ieee_extended_intel_96_format;
 305 extern const struct real_format ieee_extended_intel_96_round_53_format;
 306 extern const struct real_format ieee_extended_intel_128_format;
 307 extern const struct real_format ibm_extended_format;
 308 extern const struct real_format mips_extended_format;
 309 extern const struct real_format ieee_quad_format;
 310 extern const struct real_format mips_quad_format;
 311 extern const struct real_format vax_f_format;
 312 extern const struct real_format vax_d_format;
 313 extern const struct real_format vax_g_format;
 314 extern const struct real_format real_internal_format;
 315 extern const struct real_format decimal_single_format;
 316 extern const struct real_format decimal_double_format;
 317 extern const struct real_format decimal_quad_format;
 318 extern const struct real_format ieee_half_format;
 319 extern const struct real_format arm_half_format;
 320
 321
 322 /* ====================================================================== */
 323 /* Crap.  */
 324
 325 #define REAL_ARITHMETIC(value, code, d1, d2) \
 326   real_arithmetic (&(value), code, &(d1), &(d2))
 327
 328 #define REAL_VALUES_IDENTICAL(x, y)     real_identical (&(x), &(y))
 329 #define REAL_VALUES_EQUAL(x, y)         real_compare (EQ_EXPR, &(x), &(y))
 330 #define REAL_VALUES_LESS(x, y)          real_compare (LT_EXPR, &(x), &(y))
 331
 332 /* Determine whether a floating-point value X is infinite.  */
 333 #define REAL_VALUE_ISINF(x)             real_isinf (&(x))
 334
 335 /* Determine whether a floating-point value X is a NaN.  */
 336 #define REAL_VALUE_ISNAN(x)             real_isnan (&(x))
 337
 338 /* Determine whether a floating-point value X is negative.  */
 339 #define REAL_VALUE_NEGATIVE(x)          real_isneg (&(x))
 340
 341 /* Determine whether a floating-point value X is minus zero.  */
 342 #define REAL_VALUE_MINUS_ZERO(x)        real_isnegzero (&(x))
 343
 344 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 345 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT)                       \
 346   real_to_target (OUT, &(IN),                                           \
 347                   mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
 348
 349 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
 350   real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
 351
 352 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 353 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
 354   ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
 355
 356 #define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
 357   real_from_integer (&(r), mode, lo, hi, 0)
 358
 359 #define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
 360   real_from_integer (&(r), mode, lo, hi, 1)
 361
 362 /* Real values to IEEE 754 decimal floats.  */
 363
 364 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 365 #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \
 366   real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0))
 367
 368 #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
 369   real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0))
 370
 371 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 372 #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \
 373   ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0)))
 374
 375 extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode,
 376                                             REAL_VALUE_TYPE);
 377
 378 #define REAL_VALUE_TO_INT(plow, phigh, r) \
 379   real_to_integer2 (plow, phigh, &(r))
 380
 381 extern REAL_VALUE_TYPE real_arithmetic2 (int, const REAL_VALUE_TYPE *,
 382                                          const REAL_VALUE_TYPE *);
 383
 384 #define REAL_VALUE_NEGATE(X) \
 385   real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
 386
 387 #define REAL_VALUE_ABS(X) \
 388   real_arithmetic2 (ABS_EXPR, &(X), NULL)
 389
 390 extern int significand_size (enum machine_mode);
 391
 392 extern REAL_VALUE_TYPE real_from_string2 (const char *, enum machine_mode);
 393
 394 #define REAL_VALUE_ATOF(s, m) \
 395   real_from_string2 (s, m)
 396
 397 #define CONST_DOUBLE_ATOF(s, m) \
 398   CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
 399
 400 #define REAL_VALUE_FIX(r) \
 401   real_to_integer (&(r))
 402
 403 /* ??? Not quite right.  */
 404 #define REAL_VALUE_UNSIGNED_FIX(r) \
 405   real_to_integer (&(r))
 406
 407 /* ??? These were added for Paranoia support.  */
 408
 409 /* Return floor log2(R).  */
 410 extern int real_exponent (const REAL_VALUE_TYPE *);
 411
 412 /* R = A * 2**EXP.  */
 413 extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
 414
 415 /* **** End of software floating point emulator interface macros **** */
 416 \f
 417 /* Constant real values 0, 1, 2, -1 and 0.5.  */
 418
 419 extern REAL_VALUE_TYPE dconst0;
 420 extern REAL_VALUE_TYPE dconst1;
 421 extern REAL_VALUE_TYPE dconst2;
 422 extern REAL_VALUE_TYPE dconstm1;
 423 extern REAL_VALUE_TYPE dconsthalf;
 424
 425 #define dconst_e()  (*dconst_e_ptr ())
 426 #define dconst_third()  (*dconst_third_ptr ())
 427 #define dconst_sqrt2()  (*dconst_sqrt2_ptr ())
 428
 429 /* Function to return the real value special constant 'e'.  */
 430 extern const REAL_VALUE_TYPE * dconst_e_ptr (void);
 431
 432 /* Returns the special REAL_VALUE_TYPE corresponding to 1/3.  */
 433 extern const REAL_VALUE_TYPE * dconst_third_ptr (void);
 434
 435 /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2).  */
 436 extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void);
 437
 438 /* Function to return a real value (not a tree node)
 439    from a given integer constant.  */
 440 REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
 441
 442 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
 443 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
 444   ((to) = *CONST_DOUBLE_REAL_VALUE (from))
 445
 446 /* Return a CONST_DOUBLE with value R and mode M.  */
 447 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
 448   const_double_from_real_value (r, m)
 449 extern rtx const_double_from_real_value (REAL_VALUE_TYPE, enum machine_mode);
 450
 451 /* Replace R by 1/R in the given machine mode, if the result is exact.  */
 452 extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *);
 453
 454 /* Return true if arithmetic on values in IMODE that were promoted
 455    from values in TMODE is equivalent to direct arithmetic on values
 456    in TMODE.  */
 457 bool real_can_shorten_arithmetic (enum machine_mode, enum machine_mode);
 458
 459 /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node.  */
 460 extern tree build_real (tree, REAL_VALUE_TYPE);
 461
 462 /* Calculate R as the square root of X in the given machine mode.  */
 463 extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode,
 464                        const REAL_VALUE_TYPE *);
 465
 466 /* Calculate R as X raised to the integer exponent N in mode MODE.  */
 467 extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode,
 468                        const REAL_VALUE_TYPE *, HOST_WIDE_INT);
 469
 470 /* Standard round to integer value functions.  */
 471 extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode,
 472                         const REAL_VALUE_TYPE *);
 473 extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode,
 474                         const REAL_VALUE_TYPE *);
 475 extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode,
 476                        const REAL_VALUE_TYPE *);
 477 extern void real_round (REAL_VALUE_TYPE *, enum machine_mode,
 478                         const REAL_VALUE_TYPE *);
 479
 480 /* Set the sign of R to the sign of X.  */
 481 extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 482
 483 #ifndef GENERATOR_FILE
 484 /* Convert between MPFR and REAL_VALUE_TYPE.  The caller is
 485    responsible for initializing and clearing the MPFR parameter.  */
 486
 487 extern void real_from_mpfr (REAL_VALUE_TYPE *, mpfr_srcptr, tree, mp_rnd_t);
 488 extern void mpfr_from_real (mpfr_ptr, const REAL_VALUE_TYPE *, mp_rnd_t);
 489 #endif
 490
 491 /* Check whether the real constant value given is an integer.  */
 492 extern bool real_isinteger (const REAL_VALUE_TYPE *c, enum machine_mode mode);
 493
 494 /* Write into BUF the maximum representable finite floating-point
 495    number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
 496    float string.  BUF must be large enough to contain the result.  */
 497 extern void get_max_float (const struct real_format *, char *, size_t);
 498 #endif /* ! GCC_REAL_H */