sdcc/support/cpp/gcc/real.h

   1 /* Definitions of floating-point access for GNU compiler.
   2    Copyright (C) 1989-2022 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   /* 1 if number is decimal floating point.  */
  45   unsigned int decimal : 1;
  46   /* 1 if number is negative.  */
  47   unsigned int sign : 1;
  48   /* 1 if number is signalling.  */
  49   unsigned int signalling : 1;
  50   /* 1 if number is canonical
  51   All are generally used for handling cases in real.cc.  */
  52   unsigned int canonical : 1;
  53   /* unbiased exponent of the number.  */
  54   unsigned int uexp : EXP_BITS;
  55   /* significand of the number.  */
  56   unsigned long sig[SIGSZ];
  57 };
  58
  59 #define REAL_EXP(REAL) \
  60   ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
  61    - (1 << (EXP_BITS - 1)))
  62 #define SET_REAL_EXP(REAL, EXP) \
  63   ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
  64
  65 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
  66    needs to be a macro.  We do need to continue to have a structure tag
  67    so that other headers can forward declare it.  */
  68 #define REAL_VALUE_TYPE struct real_value
  69
  70 /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
  71    consecutive "w" slots.  Moreover, we've got to compute the number of "w"
  72    slots at preprocessor time, which means we can't use sizeof.  Guess.  */
  73
  74 #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
  75 #define REAL_WIDTH \
  76   (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
  77    + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
  78
  79
  80 // SDCC hack
  81 // #undef REAL_WIDTH
  82 // #define REAL_WIDTH 2
  83
  84 /* Verify the guess.  */
  85 extern char test_real_width
  86   [sizeof (REAL_VALUE_TYPE) <= REAL_WIDTH * sizeof (HOST_WIDE_INT) ? 1 : -1];
  87
  88 /* Calculate the format for CONST_DOUBLE.  We need as many slots as
  89    are necessary to overlay a REAL_VALUE_TYPE on them.  This could be
  90    as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
  91
  92    A number of places assume that there are always at least two 'w'
  93    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
  94
  95 #if REAL_WIDTH == 1
  96 # define CONST_DOUBLE_FORMAT     "ww"
  97 #else
  98 # if REAL_WIDTH == 2
  99 #  define CONST_DOUBLE_FORMAT    "ww"
 100 # else
 101 #  if REAL_WIDTH == 3
 102 #   define CONST_DOUBLE_FORMAT   "www"
 103 #  else
 104 #   if REAL_WIDTH == 4
 105 #    define CONST_DOUBLE_FORMAT  "wwww"
 106 #   else
 107 #    if REAL_WIDTH == 5
 108 #     define CONST_DOUBLE_FORMAT "wwwww"
 109 #    else
 110 #     if REAL_WIDTH == 6
 111 #      define CONST_DOUBLE_FORMAT "wwwwww"
 112 #     else
 113        #error "REAL_WIDTH > 6 not supported"
 114 #     endif
 115 #    endif
 116 #   endif
 117 #  endif
 118 # endif
 119 #endif
 120
 121
 122 /* Describes the properties of the specific target format in use.  */
 123 struct real_format
 124 {
 125   /* Move to and from the target bytes.  */
 126   void (*encode) (const struct real_format *, long *,
 127                   const REAL_VALUE_TYPE *);
 128   void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
 129                   const long *);
 130
 131   /* The radix of the exponent and digits of the significand.  */
 132   int b;
 133
 134   /* Size of the significand in digits of radix B.  */
 135   int p;
 136
 137   /* Size of the significant of a NaN, in digits of radix B.  */
 138   int pnan;
 139
 140   /* The minimum negative integer, x, such that b**(x-1) is normalized.  */
 141   int emin;
 142
 143   /* The maximum integer, x, such that b**(x-1) is representable.  */
 144   int emax;
 145
 146   /* The bit position of the sign bit, for determining whether a value
 147      is positive/negative, or -1 for a complex encoding.  */
 148   int signbit_ro;
 149
 150   /* The bit position of the sign bit, for changing the sign of a number,
 151      or -1 for a complex encoding.  */
 152   int signbit_rw;
 153
 154   /* If this is an IEEE interchange format, the number of bits in the
 155      format; otherwise, if it is an IEEE extended format, one more
 156      than the greatest number of bits in an interchange format it
 157      extends; otherwise 0.  Formats need not follow the IEEE 754-2008
 158      recommended practice regarding how signaling NaNs are identified,
 159      and may vary in the choice of default NaN, but must follow other
 160      IEEE practice regarding having NaNs, infinities and subnormal
 161      values, and the relation of minimum and maximum exponents, and,
 162      for interchange formats, the details of the encoding.  */
 163   int ieee_bits;
 164
 165   /* Default rounding mode for operations on this format.  */
 166   bool round_towards_zero;
 167   bool has_sign_dependent_rounding;
 168
 169   /* Properties of the format.  */
 170   bool has_nans;
 171   bool has_inf;
 172   bool has_denorm;
 173   bool has_signed_zero;
 174   bool qnan_msb_set;
 175   bool canonical_nan_lsbs_set;
 176   const char *name;
 177 };
 178
 179
 180 /* The target format used for each floating point mode.
 181    Float modes are followed by decimal float modes, with entries for
 182    float modes indexed by (MODE - first float mode), and entries for
 183    decimal float modes indexed by (MODE - first decimal float mode) +
 184    the number of float modes.  */
 185 extern const struct real_format *
 186   real_format_for_mode[NUM_MODE_FLOAT + NUM_MODE_DECIMAL_FLOAT];
 187
 188 #define REAL_MODE_FORMAT(MODE)                                          \
 189   (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE)                     \
 190                         ? (((MODE) - MIN_MODE_DECIMAL_FLOAT)            \
 191                            + NUM_MODE_FLOAT)                            \
 192                         : GET_MODE_CLASS (MODE) == MODE_FLOAT           \
 193                         ? ((MODE) - MIN_MODE_FLOAT)                     \
 194                         : (gcc_unreachable (), 0)])
 195
 196 #define FLOAT_MODE_FORMAT(MODE) \
 197   (REAL_MODE_FORMAT (as_a <scalar_float_mode> (GET_MODE_INNER (MODE))))
 198
 199 /* The following macro determines whether the floating point format is
 200    composite, i.e. may contain non-consecutive mantissa bits, in which
 201    case compile-time FP overflow may not model run-time overflow.  */
 202 #define MODE_COMPOSITE_P(MODE) \
 203   (FLOAT_MODE_P (MODE) \
 204    && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p)
 205
 206 /* Accessor macros for format properties.  */
 207 #define MODE_HAS_NANS(MODE) \
 208   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans)
 209 #define MODE_HAS_INFINITIES(MODE) \
 210   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf)
 211 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 212   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero)
 213 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
 214   (FLOAT_MODE_P (MODE) \
 215    && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
 216
 217 /* This class allows functions in this file to accept a floating-point
 218    format as either a mode or an explicit real_format pointer.  In the
 219    former case the mode must be VOIDmode (which means "no particular
 220    format") or must satisfy SCALAR_FLOAT_MODE_P.  */
 221 class format_helper
 222 {
 223 public:
 224   format_helper (const real_format *format) : m_format (format) {}
 225   template<typename T> format_helper (const T &);
 226   const real_format *operator-> () const { return m_format; }
 227   operator const real_format *() const { return m_format; }
 228
 229   bool decimal_p () const { return m_format && m_format->b == 10; }
 230   bool can_represent_integral_type_p (tree type) const;
 231
 232 private:
 233   const real_format *m_format;
 234 };
 235
 236 template<typename T>
 237 inline format_helper::format_helper (const T &m)
 238   : m_format (m == VOIDmode ? 0 : REAL_MODE_FORMAT (m))
 239 {}
 240
 241 /* Declare functions in real.cc.  */
 242
 243 /* True if the given mode has a NaN representation and the treatment of
 244    NaN operands is important.  Certain optimizations, such as folding
 245    x * 0 into 0, are not correct for NaN operands, and are normally
 246    disabled for modes with NaNs.  The user can ask for them to be
 247    done anyway using the -funsafe-math-optimizations switch.  */
 248 extern bool HONOR_NANS (machine_mode);
 249 extern bool HONOR_NANS (const_tree);
 250 extern bool HONOR_NANS (const_rtx);
 251
 252 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 253 extern bool HONOR_SNANS (machine_mode);
 254 extern bool HONOR_SNANS (const_tree);
 255 extern bool HONOR_SNANS (const_rtx);
 256
 257 /* As for HONOR_NANS, but true if the mode can represent infinity and
 258    the treatment of infinite values is important.  */
 259 extern bool HONOR_INFINITIES (machine_mode);
 260 extern bool HONOR_INFINITIES (const_tree);
 261 extern bool HONOR_INFINITIES (const_rtx);
 262
 263 /* Like HONOR_NANS, but true if the given mode distinguishes between
 264    positive and negative zero, and the sign of zero is important.  */
 265 extern bool HONOR_SIGNED_ZEROS (machine_mode);
 266 extern bool HONOR_SIGNED_ZEROS (const_tree);
 267 extern bool HONOR_SIGNED_ZEROS (const_rtx);
 268
 269 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 270    and the rounding mode is important.  */
 271 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (machine_mode);
 272 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_tree);
 273 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_rtx);
 274
 275 /* Binary or unary arithmetic on tree_code.  */
 276 extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
 277                              const REAL_VALUE_TYPE *);
 278
 279 /* Compare reals by tree_code.  */
 280 extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 281
 282 /* Determine whether a floating-point value X is infinite.  */
 283 extern bool real_isinf (const REAL_VALUE_TYPE *);
 284
 285 /* Determine whether a floating-point value X is a NaN.  */
 286 extern bool real_isnan (const REAL_VALUE_TYPE *);
 287
 288 /* Determine whether a floating-point value X is a signaling NaN.  */
 289 extern bool real_issignaling_nan (const REAL_VALUE_TYPE *);
 290
 291 /* Determine whether a floating-point value X is finite.  */
 292 extern bool real_isfinite (const REAL_VALUE_TYPE *);
 293
 294 /* Determine whether a floating-point value X is negative.  */
 295 extern bool real_isneg (const REAL_VALUE_TYPE *);
 296
 297 /* Determine whether a floating-point value X is minus zero.  */
 298 extern bool real_isnegzero (const REAL_VALUE_TYPE *);
 299
 300 /* Test relationships between reals.  */
 301 extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 302 extern bool real_equal (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 303 extern bool real_less (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 304
 305 /* Extend or truncate to a new format.  */
 306 extern void real_convert (REAL_VALUE_TYPE *, format_helper,
 307                           const REAL_VALUE_TYPE *);
 308
 309 /* Return true if truncating to NEW is exact.  */
 310 extern bool exact_real_truncate (format_helper, const REAL_VALUE_TYPE *);
 311
 312 /* Render R as a decimal floating point constant.  */
 313 extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
 314                              size_t, int);
 315
 316 /* Render R as a decimal floating point constant, rounded so as to be
 317    parsed back to the same value when interpreted in mode MODE.  */
 318 extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t,
 319                                       size_t, int, machine_mode);
 320
 321 /* Render R as a hexadecimal floating point constant.  */
 322 extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
 323                                  size_t, size_t, int);
 324
 325 /* Render R as an integer.  */
 326 extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
 327
 328 /* Initialize R from a decimal or hexadecimal string.  Return -1 if
 329    the value underflows, +1 if overflows, and 0 otherwise.  */
 330 extern int real_from_string (REAL_VALUE_TYPE *, const char *);
 331 /* Wrapper to allow different internal representation for decimal floats. */
 332 extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, format_helper);
 333
 334 extern long real_to_target (long *, const REAL_VALUE_TYPE *, format_helper);
 335
 336 extern void real_from_target (REAL_VALUE_TYPE *, const long *,
 337                               format_helper);
 338
 339 extern void real_inf (REAL_VALUE_TYPE *);
 340
 341 extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, format_helper);
 342
 343 extern void real_maxval (REAL_VALUE_TYPE *, int, machine_mode);
 344
 345 extern void real_2expN (REAL_VALUE_TYPE *, int, format_helper);
 346
 347 extern unsigned int real_hash (const REAL_VALUE_TYPE *);
 348
 349
 350 /* Target formats defined in real.cc.  */
 351 extern const struct real_format ieee_single_format;
 352 extern const struct real_format mips_single_format;
 353 extern const struct real_format motorola_single_format;
 354 extern const struct real_format spu_single_format;
 355 extern const struct real_format ieee_double_format;
 356 extern const struct real_format mips_double_format;
 357 extern const struct real_format motorola_double_format;
 358 extern const struct real_format ieee_extended_motorola_format;
 359 extern const struct real_format ieee_extended_intel_96_format;
 360 extern const struct real_format ieee_extended_intel_96_round_53_format;
 361 extern const struct real_format ieee_extended_intel_128_format;
 362 extern const struct real_format ibm_extended_format;
 363 extern const struct real_format mips_extended_format;
 364 extern const struct real_format ieee_quad_format;
 365 extern const struct real_format mips_quad_format;
 366 extern const struct real_format vax_f_format;
 367 extern const struct real_format vax_d_format;
 368 extern const struct real_format vax_g_format;
 369 extern const struct real_format real_internal_format;
 370 extern const struct real_format decimal_single_format;
 371 extern const struct real_format decimal_double_format;
 372 extern const struct real_format decimal_quad_format;
 373 extern const struct real_format ieee_half_format;
 374 extern const struct real_format arm_half_format;
 375 extern const struct real_format arm_bfloat_half_format;
 376
 377
 378 /* ====================================================================== */
 379 /* Crap.  */
 380
 381 /* Determine whether a floating-point value X is infinite.  */
 382 #define REAL_VALUE_ISINF(x)             real_isinf (&(x))
 383
 384 /* Determine whether a floating-point value X is a NaN.  */
 385 #define REAL_VALUE_ISNAN(x)             real_isnan (&(x))
 386
 387 /* Determine whether a floating-point value X is a signaling NaN.  */
 388 #define REAL_VALUE_ISSIGNALING_NAN(x)  real_issignaling_nan (&(x))
 389
 390 /* Determine whether a floating-point value X is negative.  */
 391 #define REAL_VALUE_NEGATIVE(x)          real_isneg (&(x))
 392
 393 /* Determine whether a floating-point value X is minus zero.  */
 394 #define REAL_VALUE_MINUS_ZERO(x)        real_isnegzero (&(x))
 395
 396 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 397 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT)                       \
 398   real_to_target (OUT, &(IN),                                           \
 399                   float_mode_for_size (LONG_DOUBLE_TYPE_SIZE).require ())
 400
 401 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
 402   real_to_target (OUT, &(IN), float_mode_for_size (64).require ())
 403
 404 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 405 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
 406   ((OUT) = real_to_target (NULL, &(IN), float_mode_for_size (32).require ()))
 407
 408 /* Real values to IEEE 754 decimal floats.  */
 409
 410 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 411 #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \
 412   real_to_target (OUT, &(IN), decimal_float_mode_for_size (128).require ())
 413
 414 #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
 415   real_to_target (OUT, &(IN), decimal_float_mode_for_size (64).require ())
 416
 417 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 418 #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \
 419   ((OUT) = real_to_target (NULL, &(IN), \
 420                            decimal_float_mode_for_size (32).require ()))
 421
 422 extern REAL_VALUE_TYPE real_value_truncate (format_helper, REAL_VALUE_TYPE);
 423
 424 extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *);
 425 extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *);
 426
 427 extern int significand_size (format_helper);
 428
 429 extern REAL_VALUE_TYPE real_from_string2 (const char *, format_helper);
 430
 431 #define REAL_VALUE_ATOF(s, m) \
 432   real_from_string2 (s, m)
 433
 434 #define CONST_DOUBLE_ATOF(s, m) \
 435   const_double_from_real_value (real_from_string2 (s, m), m)
 436
 437 #define REAL_VALUE_FIX(r) \
 438   real_to_integer (&(r))
 439
 440 /* ??? Not quite right.  */
 441 #define REAL_VALUE_UNSIGNED_FIX(r) \
 442   real_to_integer (&(r))
 443
 444 /* ??? These were added for Paranoia support.  */
 445
 446 /* Return floor log2(R).  */
 447 extern int real_exponent (const REAL_VALUE_TYPE *);
 448
 449 /* R = A * 2**EXP.  */
 450 extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
 451
 452 /* **** End of software floating point emulator interface macros **** */
 453 \f
 454 /* Constant real values 0, 1, 2, -1 and 0.5.  */
 455
 456 extern REAL_VALUE_TYPE dconst0;
 457 extern REAL_VALUE_TYPE dconst1;
 458 extern REAL_VALUE_TYPE dconst2;
 459 extern REAL_VALUE_TYPE dconstm1;
 460 extern REAL_VALUE_TYPE dconsthalf;
 461
 462 #define dconst_e() (*dconst_e_ptr ())
 463 #define dconst_third() (*dconst_third_ptr ())
 464 #define dconst_quarter() (*dconst_quarter_ptr ())
 465 #define dconst_sixth() (*dconst_sixth_ptr ())
 466 #define dconst_ninth() (*dconst_ninth_ptr ())
 467 #define dconst_sqrt2() (*dconst_sqrt2_ptr ())
 468
 469 /* Function to return the real value special constant 'e'.  */
 470 extern const REAL_VALUE_TYPE * dconst_e_ptr (void);
 471
 472 /* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n.  */
 473 extern const REAL_VALUE_TYPE *dconst_third_ptr (void);
 474 extern const REAL_VALUE_TYPE *dconst_quarter_ptr (void);
 475 extern const REAL_VALUE_TYPE *dconst_sixth_ptr (void);
 476 extern const REAL_VALUE_TYPE *dconst_ninth_ptr (void);
 477
 478 /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2).  */
 479 extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void);
 480
 481 /* Function to return a real value (not a tree node)
 482    from a given integer constant.  */
 483 REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
 484
 485 /* Return a CONST_DOUBLE with value R and mode M.  */
 486 extern rtx const_double_from_real_value (REAL_VALUE_TYPE, machine_mode);
 487
 488 /* Replace R by 1/R in the given format, if the result is exact.  */
 489 extern bool exact_real_inverse (format_helper, REAL_VALUE_TYPE *);
 490
 491 /* Return true if arithmetic on values in IMODE that were promoted
 492    from values in TMODE is equivalent to direct arithmetic on values
 493    in TMODE.  */
 494 bool real_can_shorten_arithmetic (machine_mode, machine_mode);
 495
 496 /* In tree.cc: wrap up a REAL_VALUE_TYPE in a tree node.  */
 497 extern tree build_real (tree, REAL_VALUE_TYPE);
 498
 499 /* Likewise, but first truncate the value to the type.  */
 500 extern tree build_real_truncate (tree, REAL_VALUE_TYPE);
 501
 502 /* Calculate R as X raised to the integer exponent N in format FMT.  */
 503 extern bool real_powi (REAL_VALUE_TYPE *, format_helper,
 504                        const REAL_VALUE_TYPE *, HOST_WIDE_INT);
 505
 506 /* Standard round to integer value functions.  */
 507 extern void real_trunc (REAL_VALUE_TYPE *, format_helper,
 508                         const REAL_VALUE_TYPE *);
 509 extern void real_floor (REAL_VALUE_TYPE *, format_helper,
 510                         const REAL_VALUE_TYPE *);
 511 extern void real_ceil (REAL_VALUE_TYPE *, format_helper,
 512                        const REAL_VALUE_TYPE *);
 513 extern void real_round (REAL_VALUE_TYPE *, format_helper,
 514                         const REAL_VALUE_TYPE *);
 515 extern void real_roundeven (REAL_VALUE_TYPE *, format_helper,
 516                             const REAL_VALUE_TYPE *);
 517
 518 /* Set the sign of R to the sign of X.  */
 519 extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 520
 521 /* Check whether the real constant value given is an integer.  */
 522 extern bool real_isinteger (const REAL_VALUE_TYPE *, format_helper);
 523 extern bool real_isinteger (const REAL_VALUE_TYPE *, HOST_WIDE_INT *);
 524
 525 /* Calculate nextafter (X, Y) in format FMT.  */
 526 extern bool real_nextafter (REAL_VALUE_TYPE *, format_helper,
 527                             const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 528
 529 /* Write into BUF the maximum representable finite floating-point
 530    number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
 531    float string.  BUF must be large enough to contain the result.  */
 532 extern void get_max_float (const struct real_format *, char *, size_t, bool);
 533
 534 #if 0 // sdcpp ndef GENERATOR_FILE
 535 /* real related routines.  */
 536 extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int);
 537 extern void real_from_integer (REAL_VALUE_TYPE *, format_helper,
 538                                const wide_int_ref &, signop);
 539 #endif
 540
 541 /* Fills r with the largest value such that 1 + r*r won't overflow.
 542    This is used in both sin (atan (x)) and cos (atan(x)) optimizations. */
 543 extern void build_sinatan_real (REAL_VALUE_TYPE *, tree);
 544
 545 #endif /* ! GCC_REAL_H */