gcc/real.h

   1 /* Definitions of floating-point access for GNU compiler.
   2    Copyright (C) 1989-2017 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 it under
   7    the terms of the GNU General Public License as published by the Free
   8    Software Foundation; either version 3, or (at your option) any later
   9    version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14    for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_REAL_H
  21 #define GCC_REAL_H
  22
  23 /* An expanded form of the represented number.  */
  24
  25 /* Enumerate the special cases of numbers that we encounter.  */
  26 enum real_value_class {
  27   rvc_zero,
  28   rvc_normal,
  29   rvc_inf,
  30   rvc_nan
  31 };
  32
  33 #define SIGNIFICAND_BITS        (128 + HOST_BITS_PER_LONG)
  34 #define EXP_BITS                (32 - 6)
  35 #define MAX_EXP                 ((1 << (EXP_BITS - 1)) - 1)
  36 #define SIGSZ                   (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
  37 #define SIG_MSB                 ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
  38
  39 struct GTY(()) real_value {
  40   /* Use the same underlying type for all bit-fields, so as to make
  41      sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
  42      be miscomputed.  */
  43   unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
  44   unsigned int decimal : 1;
  45   unsigned int sign : 1;
  46   unsigned int signalling : 1;
  47   unsigned int canonical : 1;
  48   unsigned int uexp : EXP_BITS;
  49   unsigned long sig[SIGSZ];
  50 };
  51
  52 #define REAL_EXP(REAL) \
  53   ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
  54    - (1 << (EXP_BITS - 1)))
  55 #define SET_REAL_EXP(REAL, EXP) \
  56   ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
  57
  58 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
  59    needs to be a macro.  We do need to continue to have a structure tag
  60    so that other headers can forward declare it.  */
  61 #define REAL_VALUE_TYPE struct real_value
  62
  63 /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
  64    consecutive "w" slots.  Moreover, we've got to compute the number of "w"
  65    slots at preprocessor time, which means we can't use sizeof.  Guess.  */
  66
  67 #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
  68 #define REAL_WIDTH \
  69   (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
  70    + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
  71
  72 /* Verify the guess.  */
  73 extern char test_real_width
  74   [sizeof (REAL_VALUE_TYPE) <= REAL_WIDTH * sizeof (HOST_WIDE_INT) ? 1 : -1];
  75
  76 /* Calculate the format for CONST_DOUBLE.  We need as many slots as
  77    are necessary to overlay a REAL_VALUE_TYPE on them.  This could be
  78    as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
  79
  80    A number of places assume that there are always at least two 'w'
  81    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
  82
  83 #if REAL_WIDTH == 1
  84 # define CONST_DOUBLE_FORMAT     "ww"
  85 #else
  86 # if REAL_WIDTH == 2
  87 #  define CONST_DOUBLE_FORMAT    "ww"
  88 # else
  89 #  if REAL_WIDTH == 3
  90 #   define CONST_DOUBLE_FORMAT   "www"
  91 #  else
  92 #   if REAL_WIDTH == 4
  93 #    define CONST_DOUBLE_FORMAT  "wwww"
  94 #   else
  95 #    if REAL_WIDTH == 5
  96 #     define CONST_DOUBLE_FORMAT "wwwww"
  97 #    else
  98 #     if REAL_WIDTH == 6
  99 #      define CONST_DOUBLE_FORMAT "wwwwww"
 100 #     else
 101        #error "REAL_WIDTH > 6 not supported"
 102 #     endif
 103 #    endif
 104 #   endif
 105 #  endif
 106 # endif
 107 #endif
 108
 109
 110 /* Describes the properties of the specific target format in use.  */
 111 struct real_format
 112 {
 113   /* Move to and from the target bytes.  */
 114   void (*encode) (const struct real_format *, long *,
 115                   const REAL_VALUE_TYPE *);
 116   void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
 117                   const long *);
 118
 119   /* The radix of the exponent and digits of the significand.  */
 120   int b;
 121
 122   /* Size of the significand in digits of radix B.  */
 123   int p;
 124
 125   /* Size of the significant of a NaN, in digits of radix B.  */
 126   int pnan;
 127
 128   /* The minimum negative integer, x, such that b**(x-1) is normalized.  */
 129   int emin;
 130
 131   /* The maximum integer, x, such that b**(x-1) is representable.  */
 132   int emax;
 133
 134   /* The bit position of the sign bit, for determining whether a value
 135      is positive/negative, or -1 for a complex encoding.  */
 136   int signbit_ro;
 137
 138   /* The bit position of the sign bit, for changing the sign of a number,
 139      or -1 for a complex encoding.  */
 140   int signbit_rw;
 141
 142   /* If this is an IEEE interchange format, the number of bits in the
 143      format; otherwise, if it is an IEEE extended format, one more
 144      than the greatest number of bits in an interchange format it
 145      extends; otherwise 0.  Formats need not follow the IEEE 754-2008
 146      recommended practice regarding how signaling NaNs are identified,
 147      and may vary in the choice of default NaN, but must follow other
 148      IEEE practice regarding having NaNs, infinities and subnormal
 149      values, and the relation of minimum and maximum exponents, and,
 150      for interchange formats, the details of the encoding.  */
 151   int ieee_bits;
 152
 153   /* Default rounding mode for operations on this format.  */
 154   bool round_towards_zero;
 155   bool has_sign_dependent_rounding;
 156
 157   /* Properties of the format.  */
 158   bool has_nans;
 159   bool has_inf;
 160   bool has_denorm;
 161   bool has_signed_zero;
 162   bool qnan_msb_set;
 163   bool canonical_nan_lsbs_set;
 164   const char *name;
 165 };
 166
 167
 168 /* The target format used for each floating point mode.
 169    Float modes are followed by decimal float modes, with entries for
 170    float modes indexed by (MODE - first float mode), and entries for
 171    decimal float modes indexed by (MODE - first decimal float mode) +
 172    the number of float modes.  */
 173 extern const struct real_format *
 174   real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1
 175                        + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1];
 176
 177 #define REAL_MODE_FORMAT(MODE)                                          \
 178   (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE)                     \
 179                         ? (((MODE) - MIN_MODE_DECIMAL_FLOAT)            \
 180                            + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1))     \
 181                         : GET_MODE_CLASS (MODE) == MODE_FLOAT           \
 182                         ? ((MODE) - MIN_MODE_FLOAT)                     \
 183                         : (gcc_unreachable (), 0)])
 184
 185 #define FLOAT_MODE_FORMAT(MODE) \
 186   (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \
 187                                                : GET_MODE_INNER (MODE)))
 188
 189 /* The following macro determines whether the floating point format is
 190    composite, i.e. may contain non-consecutive mantissa bits, in which
 191    case compile-time FP overflow may not model run-time overflow.  */
 192 #define MODE_COMPOSITE_P(MODE) \
 193   (FLOAT_MODE_P (MODE) \
 194    && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p)
 195
 196 /* Accessor macros for format properties.  */
 197 #define MODE_HAS_NANS(MODE) \
 198   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans)
 199 #define MODE_HAS_INFINITIES(MODE) \
 200   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf)
 201 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 202   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero)
 203 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
 204   (FLOAT_MODE_P (MODE) \
 205    && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
 206
 207 /* This class allows functions in this file to accept a floating-point
 208    format as either a mode or an explicit real_format pointer.  In the
 209    former case the mode must be VOIDmode (which means "no particular
 210    format") or must satisfy SCALAR_FLOAT_MODE_P.  */
 211 class format_helper
 212 {
 213 public:
 214   format_helper (const real_format *format) : m_format (format) {}
 215   format_helper (machine_mode m);
 216   const real_format *operator-> () const { return m_format; }
 217   operator const real_format *() const { return m_format; }
 218
 219   bool decimal_p () const { return m_format && m_format->b == 10; }
 220
 221 private:
 222   const real_format *m_format;
 223 };
 224
 225 inline format_helper::format_helper (machine_mode m)
 226   : m_format (m == VOIDmode ? 0 : REAL_MODE_FORMAT (m))
 227 {}
 228
 229 /* Declare functions in real.c.  */
 230
 231 /* True if the given mode has a NaN representation and the treatment of
 232    NaN operands is important.  Certain optimizations, such as folding
 233    x * 0 into 0, are not correct for NaN operands, and are normally
 234    disabled for modes with NaNs.  The user can ask for them to be
 235    done anyway using the -funsafe-math-optimizations switch.  */
 236 extern bool HONOR_NANS (machine_mode);
 237 extern bool HONOR_NANS (const_tree);
 238 extern bool HONOR_NANS (const_rtx);
 239
 240 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 241 extern bool HONOR_SNANS (machine_mode);
 242 extern bool HONOR_SNANS (const_tree);
 243 extern bool HONOR_SNANS (const_rtx);
 244
 245 /* As for HONOR_NANS, but true if the mode can represent infinity and
 246    the treatment of infinite values is important.  */
 247 extern bool HONOR_INFINITIES (machine_mode);
 248 extern bool HONOR_INFINITIES (const_tree);
 249 extern bool HONOR_INFINITIES (const_rtx);
 250
 251 /* Like HONOR_NANS, but true if the given mode distinguishes between
 252    positive and negative zero, and the sign of zero is important.  */
 253 extern bool HONOR_SIGNED_ZEROS (machine_mode);
 254 extern bool HONOR_SIGNED_ZEROS (const_tree);
 255 extern bool HONOR_SIGNED_ZEROS (const_rtx);
 256
 257 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 258    and the rounding mode is important.  */
 259 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (machine_mode);
 260 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_tree);
 261 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_rtx);
 262
 263 /* Binary or unary arithmetic on tree_code.  */
 264 extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
 265                              const REAL_VALUE_TYPE *);
 266
 267 /* Compare reals by tree_code.  */
 268 extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 269
 270 /* Determine whether a floating-point value X is infinite.  */
 271 extern bool real_isinf (const REAL_VALUE_TYPE *);
 272
 273 /* Determine whether a floating-point value X is a NaN.  */
 274 extern bool real_isnan (const REAL_VALUE_TYPE *);
 275
 276 /* Determine whether a floating-point value X is a signaling NaN.  */
 277 extern bool real_issignaling_nan (const REAL_VALUE_TYPE *);
 278
 279 /* Determine whether a floating-point value X is finite.  */
 280 extern bool real_isfinite (const REAL_VALUE_TYPE *);
 281
 282 /* Determine whether a floating-point value X is negative.  */
 283 extern bool real_isneg (const REAL_VALUE_TYPE *);
 284
 285 /* Determine whether a floating-point value X is minus zero.  */
 286 extern bool real_isnegzero (const REAL_VALUE_TYPE *);
 287
 288 /* Test relationships between reals.  */
 289 extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 290 extern bool real_equal (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 291 extern bool real_less (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 292
 293 /* Extend or truncate to a new format.  */
 294 extern void real_convert (REAL_VALUE_TYPE *, format_helper,
 295                           const REAL_VALUE_TYPE *);
 296
 297 /* Return true if truncating to NEW is exact.  */
 298 extern bool exact_real_truncate (format_helper, const REAL_VALUE_TYPE *);
 299
 300 /* Render R as a decimal floating point constant.  */
 301 extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
 302                              size_t, int);
 303
 304 /* Render R as a decimal floating point constant, rounded so as to be
 305    parsed back to the same value when interpreted in mode MODE.  */
 306 extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t,
 307                                       size_t, int, machine_mode);
 308
 309 /* Render R as a hexadecimal floating point constant.  */
 310 extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
 311                                  size_t, size_t, int);
 312
 313 /* Render R as an integer.  */
 314 extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
 315
 316 /* Initialize R from a decimal or hexadecimal string.  Return -1 if
 317    the value underflows, +1 if overflows, and 0 otherwise.  */
 318 extern int real_from_string (REAL_VALUE_TYPE *, const char *);
 319 /* Wrapper to allow different internal representation for decimal floats. */
 320 extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, format_helper);
 321
 322 extern long real_to_target (long *, const REAL_VALUE_TYPE *, format_helper);
 323
 324 extern void real_from_target (REAL_VALUE_TYPE *, const long *,
 325                               format_helper);
 326
 327 extern void real_inf (REAL_VALUE_TYPE *);
 328
 329 extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, format_helper);
 330
 331 extern void real_maxval (REAL_VALUE_TYPE *, int, machine_mode);
 332
 333 extern void real_2expN (REAL_VALUE_TYPE *, int, format_helper);
 334
 335 extern unsigned int real_hash (const REAL_VALUE_TYPE *);
 336
 337
 338 /* Target formats defined in real.c.  */
 339 extern const struct real_format ieee_single_format;
 340 extern const struct real_format mips_single_format;
 341 extern const struct real_format motorola_single_format;
 342 extern const struct real_format spu_single_format;
 343 extern const struct real_format ieee_double_format;
 344 extern const struct real_format mips_double_format;
 345 extern const struct real_format motorola_double_format;
 346 extern const struct real_format ieee_extended_motorola_format;
 347 extern const struct real_format ieee_extended_intel_96_format;
 348 extern const struct real_format ieee_extended_intel_96_round_53_format;
 349 extern const struct real_format ieee_extended_intel_128_format;
 350 extern const struct real_format ibm_extended_format;
 351 extern const struct real_format mips_extended_format;
 352 extern const struct real_format ieee_quad_format;
 353 extern const struct real_format mips_quad_format;
 354 extern const struct real_format vax_f_format;
 355 extern const struct real_format vax_d_format;
 356 extern const struct real_format vax_g_format;
 357 extern const struct real_format real_internal_format;
 358 extern const struct real_format decimal_single_format;
 359 extern const struct real_format decimal_double_format;
 360 extern const struct real_format decimal_quad_format;
 361 extern const struct real_format ieee_half_format;
 362 extern const struct real_format arm_half_format;
 363
 364
 365 /* ====================================================================== */
 366 /* Crap.  */
 367
 368 /* Determine whether a floating-point value X is infinite.  */
 369 #define REAL_VALUE_ISINF(x)             real_isinf (&(x))
 370
 371 /* Determine whether a floating-point value X is a NaN.  */
 372 #define REAL_VALUE_ISNAN(x)             real_isnan (&(x))
 373
 374 /* Determine whether a floating-point value X is a signaling NaN.  */
 375 #define REAL_VALUE_ISSIGNALING_NAN(x)  real_issignaling_nan (&(x))
 376
 377 /* Determine whether a floating-point value X is negative.  */
 378 #define REAL_VALUE_NEGATIVE(x)          real_isneg (&(x))
 379
 380 /* Determine whether a floating-point value X is minus zero.  */
 381 #define REAL_VALUE_MINUS_ZERO(x)        real_isnegzero (&(x))
 382
 383 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 384 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT)                       \
 385   real_to_target (OUT, &(IN),                                           \
 386                   mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
 387
 388 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
 389   real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
 390
 391 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 392 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
 393   ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
 394
 395 /* Real values to IEEE 754 decimal floats.  */
 396
 397 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 398 #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \
 399   real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0))
 400
 401 #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
 402   real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0))
 403
 404 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 405 #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \
 406   ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0)))
 407
 408 extern REAL_VALUE_TYPE real_value_truncate (format_helper, REAL_VALUE_TYPE);
 409
 410 extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *);
 411 extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *);
 412
 413 extern int significand_size (format_helper);
 414
 415 extern REAL_VALUE_TYPE real_from_string2 (const char *, format_helper);
 416
 417 #define REAL_VALUE_ATOF(s, m) \
 418   real_from_string2 (s, m)
 419
 420 #define CONST_DOUBLE_ATOF(s, m) \
 421   const_double_from_real_value (real_from_string2 (s, m), m)
 422
 423 #define REAL_VALUE_FIX(r) \
 424   real_to_integer (&(r))
 425
 426 /* ??? Not quite right.  */
 427 #define REAL_VALUE_UNSIGNED_FIX(r) \
 428   real_to_integer (&(r))
 429
 430 /* ??? These were added for Paranoia support.  */
 431
 432 /* Return floor log2(R).  */
 433 extern int real_exponent (const REAL_VALUE_TYPE *);
 434
 435 /* R = A * 2**EXP.  */
 436 extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
 437
 438 /* **** End of software floating point emulator interface macros **** */
 439 \f
 440 /* Constant real values 0, 1, 2, -1 and 0.5.  */
 441
 442 extern REAL_VALUE_TYPE dconst0;
 443 extern REAL_VALUE_TYPE dconst1;
 444 extern REAL_VALUE_TYPE dconst2;
 445 extern REAL_VALUE_TYPE dconstm1;
 446 extern REAL_VALUE_TYPE dconsthalf;
 447
 448 #define dconst_e() (*dconst_e_ptr ())
 449 #define dconst_third() (*dconst_third_ptr ())
 450 #define dconst_quarter() (*dconst_quarter_ptr ())
 451 #define dconst_sixth() (*dconst_sixth_ptr ())
 452 #define dconst_ninth() (*dconst_ninth_ptr ())
 453 #define dconst_sqrt2() (*dconst_sqrt2_ptr ())
 454
 455 /* Function to return the real value special constant 'e'.  */
 456 extern const REAL_VALUE_TYPE * dconst_e_ptr (void);
 457
 458 /* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n.  */
 459 extern const REAL_VALUE_TYPE *dconst_third_ptr (void);
 460 extern const REAL_VALUE_TYPE *dconst_quarter_ptr (void);
 461 extern const REAL_VALUE_TYPE *dconst_sixth_ptr (void);
 462 extern const REAL_VALUE_TYPE *dconst_ninth_ptr (void);
 463
 464 /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2).  */
 465 extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void);
 466
 467 /* Function to return a real value (not a tree node)
 468    from a given integer constant.  */
 469 REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
 470
 471 /* Return a CONST_DOUBLE with value R and mode M.  */
 472 extern rtx const_double_from_real_value (REAL_VALUE_TYPE, machine_mode);
 473
 474 /* Replace R by 1/R in the given format, if the result is exact.  */
 475 extern bool exact_real_inverse (format_helper, REAL_VALUE_TYPE *);
 476
 477 /* Return true if arithmetic on values in IMODE that were promoted
 478    from values in TMODE is equivalent to direct arithmetic on values
 479    in TMODE.  */
 480 bool real_can_shorten_arithmetic (machine_mode, machine_mode);
 481
 482 /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node.  */
 483 extern tree build_real (tree, REAL_VALUE_TYPE);
 484
 485 /* Likewise, but first truncate the value to the type.  */
 486 extern tree build_real_truncate (tree, REAL_VALUE_TYPE);
 487
 488 /* Calculate R as X raised to the integer exponent N in format FMT.  */
 489 extern bool real_powi (REAL_VALUE_TYPE *, format_helper,
 490                        const REAL_VALUE_TYPE *, HOST_WIDE_INT);
 491
 492 /* Standard round to integer value functions.  */
 493 extern void real_trunc (REAL_VALUE_TYPE *, format_helper,
 494                         const REAL_VALUE_TYPE *);
 495 extern void real_floor (REAL_VALUE_TYPE *, format_helper,
 496                         const REAL_VALUE_TYPE *);
 497 extern void real_ceil (REAL_VALUE_TYPE *, format_helper,
 498                        const REAL_VALUE_TYPE *);
 499 extern void real_round (REAL_VALUE_TYPE *, format_helper,
 500                         const REAL_VALUE_TYPE *);
 501
 502 /* Set the sign of R to the sign of X.  */
 503 extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 504
 505 /* Check whether the real constant value given is an integer.  */
 506 extern bool real_isinteger (const REAL_VALUE_TYPE *, format_helper);
 507 extern bool real_isinteger (const REAL_VALUE_TYPE *, HOST_WIDE_INT *);
 508
 509 /* Write into BUF the maximum representable finite floating-point
 510    number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
 511    float string.  BUF must be large enough to contain the result.  */
 512 extern void get_max_float (const struct real_format *, char *, size_t);
 513
 514 #ifndef GENERATOR_FILE
 515 /* real related routines.  */
 516 extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int);
 517 extern void real_from_integer (REAL_VALUE_TYPE *, format_helper,
 518                                const wide_int_ref &, signop);
 519 #endif
 520
 521 #endif /* ! GCC_REAL_H */