release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/lib/gcc/arm-brcm-linux-uclibcgnueabi/4.5.3/plugin/include/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, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it under
   9    the terms of the GNU General Public License as published by the Free
  10    Software Foundation; either version 3, or (at your option) any later
  11    version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16    for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_REAL_H
  23 #define GCC_REAL_H
  24
  25 #ifndef GENERATOR_FILE
  26 #include <gmp.h>
  27 #include <mpfr.h>
  28 #include <mpc.h>
  29 extern tree do_mpc_arg2 (tree, tree, tree, int, int (*)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t));
  30 #endif
  31 #include "machmode.h"
  32
  33 /* An expanded form of the represented number.  */
  34
  35 /* Enumerate the special cases of numbers that we encounter.  */
  36 enum real_value_class {
  37   rvc_zero,
  38   rvc_normal,
  39   rvc_inf,
  40   rvc_nan
  41 };
  42
  43 #define SIGNIFICAND_BITS        (128 + HOST_BITS_PER_LONG)
  44 #define EXP_BITS                (32 - 6)
  45 #define MAX_EXP                 ((1 << (EXP_BITS - 1)) - 1)
  46 #define SIGSZ                   (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
  47 #define SIG_MSB                 ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
  48
  49 struct GTY(()) real_value {
  50   /* Use the same underlying type for all bit-fields, so as to make
  51      sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
  52      be miscomputed.  */
  53   unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
  54   unsigned int decimal : 1;
  55   unsigned int sign : 1;
  56   unsigned int signalling : 1;
  57   unsigned int canonical : 1;
  58   unsigned int uexp : EXP_BITS;
  59   unsigned long sig[SIGSZ];
  60 };
  61
  62 #define REAL_EXP(REAL) \
  63   ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
  64    - (1 << (EXP_BITS - 1)))
  65 #define SET_REAL_EXP(REAL, EXP) \
  66   ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
  67
  68 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
  69    needs to be a macro.  We do need to continue to have a structure tag
  70    so that other headers can forward declare it.  */
  71 #define REAL_VALUE_TYPE struct real_value
  72
  73 /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
  74    consecutive "w" slots.  Moreover, we've got to compute the number of "w"
  75    slots at preprocessor time, which means we can't use sizeof.  Guess.  */
  76
  77 #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
  78 #define REAL_WIDTH \
  79   (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
  80    + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
  81
  82 /* Verify the guess.  */
  83 extern char test_real_width
  84   [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
  85
  86 /* Calculate the format for CONST_DOUBLE.  We need as many slots as
  87    are necessary to overlay a REAL_VALUE_TYPE on them.  This could be
  88    as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
  89
  90    A number of places assume that there are always at least two 'w'
  91    slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
  92
  93 #if REAL_WIDTH == 1
  94 # define CONST_DOUBLE_FORMAT     "ww"
  95 #else
  96 # if REAL_WIDTH == 2
  97 #  define CONST_DOUBLE_FORMAT    "ww"
  98 # else
  99 #  if REAL_WIDTH == 3
 100 #   define CONST_DOUBLE_FORMAT   "www"
 101 #  else
 102 #   if REAL_WIDTH == 4
 103 #    define CONST_DOUBLE_FORMAT  "wwww"
 104 #   else
 105 #    if REAL_WIDTH == 5
 106 #     define CONST_DOUBLE_FORMAT "wwwww"
 107 #    else
 108 #     if REAL_WIDTH == 6
 109 #      define CONST_DOUBLE_FORMAT "wwwwww"
 110 #     else
 111        #error "REAL_WIDTH > 6 not supported"
 112 #     endif
 113 #    endif
 114 #   endif
 115 #  endif
 116 # endif
 117 #endif
 118
 119
 120 /* Describes the properties of the specific target format in use.  */
 121 struct real_format
 122 {
 123   /* Move to and from the target bytes.  */
 124   void (*encode) (const struct real_format *, long *,
 125                   const REAL_VALUE_TYPE *);
 126   void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
 127                   const long *);
 128
 129   /* The radix of the exponent and digits of the significand.  */
 130   int b;
 131
 132   /* Size of the significand in digits of radix B.  */
 133   int p;
 134
 135   /* Size of the significant of a NaN, in digits of radix B.  */
 136   int pnan;
 137
 138   /* The minimum negative integer, x, such that b**(x-1) is normalized.  */
 139   int emin;
 140
 141   /* The maximum integer, x, such that b**(x-1) is representable.  */
 142   int emax;
 143
 144   /* The bit position of the sign bit, for determining whether a value
 145      is positive/negative, or -1 for a complex encoding.  */
 146   int signbit_ro;
 147
 148   /* The bit position of the sign bit, for changing the sign of a number,
 149      or -1 for a complex encoding.  */
 150   int signbit_rw;
 151
 152   /* Default rounding mode for operations on this format.  */
 153   bool round_towards_zero;
 154   bool has_sign_dependent_rounding;
 155
 156   /* Properties of the format.  */
 157   bool has_nans;
 158   bool has_inf;
 159   bool has_denorm;
 160   bool has_signed_zero;
 161   bool qnan_msb_set;
 162   bool canonical_nan_lsbs_set;
 163 };
 164
 165
 166 /* The target format used for each floating point mode.
 167    Float modes are followed by decimal float modes, with entries for
 168    float modes indexed by (MODE - first float mode), and entries for
 169    decimal float modes indexed by (MODE - first decimal float mode) +
 170    the number of float modes.  */
 171 extern const struct real_format *
 172   real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1
 173                        + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1];
 174
 175 #define REAL_MODE_FORMAT(MODE)                                          \
 176   (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE)                     \
 177                         ? (((MODE) - MIN_MODE_DECIMAL_FLOAT)            \
 178                            + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1))     \
 179                         : ((MODE) - MIN_MODE_FLOAT)])
 180
 181 #define FLOAT_MODE_FORMAT(MODE) \
 182   (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \
 183                                                : GET_MODE_INNER (MODE)))
 184
 185 /* The following macro determines whether the floating point format is
 186    composite, i.e. may contain non-consecutive mantissa bits, in which
 187    case compile-time FP overflow may not model run-time overflow.  */
 188 #define MODE_COMPOSITE_P(MODE) \
 189   (FLOAT_MODE_P (MODE) \
 190    && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p)
 191
 192 /* Accessor macros for format properties.  */
 193 #define MODE_HAS_NANS(MODE) \
 194   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans)
 195 #define MODE_HAS_INFINITIES(MODE) \
 196   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf)
 197 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 198   (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero)
 199 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
 200   (FLOAT_MODE_P (MODE) \
 201    && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
 202
 203 /* True if the given mode has a NaN representation and the treatment of
 204    NaN operands is important.  Certain optimizations, such as folding
 205    x * 0 into 0, are not correct for NaN operands, and are normally
 206    disabled for modes with NaNs.  The user can ask for them to be
 207    done anyway using the -funsafe-math-optimizations switch.  */
 208 #define HONOR_NANS(MODE) \
 209   (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
 210
 211 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 212 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
 213
 214 /* As for HONOR_NANS, but true if the mode can represent infinity and
 215    the treatment of infinite values is important.  */
 216 #define HONOR_INFINITIES(MODE) \
 217   (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
 218
 219 /* Like HONOR_NANS, but true if the given mode distinguishes between
 220    positive and negative zero, and the sign of zero is important.  */
 221 #define HONOR_SIGNED_ZEROS(MODE) \
 222   (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
 223
 224 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 225    and the rounding mode is important.  */
 226 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
 227   (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
 228
 229 /* Declare functions in real.c.  */
 230
 231 /* Binary or unary arithmetic on tree_code.  */
 232 extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
 233                              const REAL_VALUE_TYPE *);
 234
 235 /* Compare reals by tree_code.  */
 236 extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 237
 238 /* Determine whether a floating-point value X is infinite.  */
 239 extern bool real_isinf (const REAL_VALUE_TYPE *);
 240
 241 /* Determine whether a floating-point value X is a NaN.  */
 242 extern bool real_isnan (const REAL_VALUE_TYPE *);
 243
 244 /* Determine whether a floating-point value X is finite.  */
 245 extern bool real_isfinite (const REAL_VALUE_TYPE *);
 246
 247 /* Determine whether a floating-point value X is negative.  */
 248 extern bool real_isneg (const REAL_VALUE_TYPE *);
 249
 250 /* Determine whether a floating-point value X is minus zero.  */
 251 extern bool real_isnegzero (const REAL_VALUE_TYPE *);
 252
 253 /* Compare two floating-point objects for bitwise identity.  */
 254 extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 255
 256 /* Extend or truncate to a new mode.  */
 257 extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode,
 258                           const REAL_VALUE_TYPE *);
 259
 260 /* Return true if truncating to NEW is exact.  */
 261 extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *);
 262
 263 /* Render R as a decimal floating point constant.  */
 264 extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
 265                              size_t, int);
 266
 267 /* Render R as a decimal floating point constant, rounded so as to be
 268    parsed back to the same value when interpreted in mode MODE.  */
 269 extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t,
 270                                       size_t, int, enum machine_mode);
 271
 272 /* Render R as a hexadecimal floating point constant.  */
 273 extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
 274                                  size_t, size_t, int);
 275
 276 /* Render R as an integer.  */
 277 extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
 278 extern void real_to_integer2 (HOST_WIDE_INT *, HOST_WIDE_INT *,
 279                               const REAL_VALUE_TYPE *);
 280
 281 /* Initialize R from a decimal or hexadecimal string.  Return -1 if
 282    the value underflows, +1 if overflows, and 0 otherwise.  */
 283 extern int real_from_string (REAL_VALUE_TYPE *, const char *);
 284 /* Wrapper to allow different internal representation for decimal floats. */
 285 extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, enum machine_mode);
 286
 287 /* Initialize R from an integer pair HIGH/LOW.  */
 288 extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode,
 289                                unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
 290
 291 extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *,
 292                                 const struct real_format *);
 293 extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode);
 294
 295 extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *,
 296                                   const struct real_format *);
 297 extern void real_from_target (REAL_VALUE_TYPE *, const long *,
 298                               enum machine_mode);
 299
 300 extern void real_inf (REAL_VALUE_TYPE *);
 301
 302 extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
 303
 304 extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
 305
 306 extern void real_2expN (REAL_VALUE_TYPE *, int, enum machine_mode);
 307
 308 extern unsigned int real_hash (const REAL_VALUE_TYPE *);
 309
 310
 311 /* Target formats defined in real.c.  */
 312 extern const struct real_format ieee_single_format;
 313 extern const struct real_format mips_single_format;
 314 extern const struct real_format motorola_single_format;
 315 extern const struct real_format spu_single_format;
 316 extern const struct real_format ieee_double_format;
 317 extern const struct real_format mips_double_format;
 318 extern const struct real_format motorola_double_format;
 319 extern const struct real_format ieee_extended_motorola_format;
 320 extern const struct real_format ieee_extended_intel_96_format;
 321 extern const struct real_format ieee_extended_intel_96_round_53_format;
 322 extern const struct real_format ieee_extended_intel_128_format;
 323 extern const struct real_format ibm_extended_format;
 324 extern const struct real_format mips_extended_format;
 325 extern const struct real_format ieee_quad_format;
 326 extern const struct real_format mips_quad_format;
 327 extern const struct real_format vax_f_format;
 328 extern const struct real_format vax_d_format;
 329 extern const struct real_format vax_g_format;
 330 extern const struct real_format real_internal_format;
 331 extern const struct real_format decimal_single_format;
 332 extern const struct real_format decimal_double_format;
 333 extern const struct real_format decimal_quad_format;
 334 extern const struct real_format ieee_half_format;
 335 extern const struct real_format arm_half_format;
 336
 337
 338 /* ====================================================================== */
 339 /* Crap.  */
 340
 341 #define REAL_ARITHMETIC(value, code, d1, d2) \
 342   real_arithmetic (&(value), code, &(d1), &(d2))
 343
 344 #define REAL_VALUES_IDENTICAL(x, y)     real_identical (&(x), &(y))
 345 #define REAL_VALUES_EQUAL(x, y)         real_compare (EQ_EXPR, &(x), &(y))
 346 #define REAL_VALUES_LESS(x, y)          real_compare (LT_EXPR, &(x), &(y))
 347
 348 /* Determine whether a floating-point value X is infinite.  */
 349 #define REAL_VALUE_ISINF(x)             real_isinf (&(x))
 350
 351 /* Determine whether a floating-point value X is a NaN.  */
 352 #define REAL_VALUE_ISNAN(x)             real_isnan (&(x))
 353
 354 /* Determine whether a floating-point value X is negative.  */
 355 #define REAL_VALUE_NEGATIVE(x)          real_isneg (&(x))
 356
 357 /* Determine whether a floating-point value X is minus zero.  */
 358 #define REAL_VALUE_MINUS_ZERO(x)        real_isnegzero (&(x))
 359
 360 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 361 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT)                       \
 362   real_to_target (OUT, &(IN),                                           \
 363                   mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
 364
 365 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
 366   real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
 367
 368 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 369 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
 370   ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
 371
 372 #define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
 373   real_from_integer (&(r), mode, lo, hi, 0)
 374
 375 #define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
 376   real_from_integer (&(r), mode, lo, hi, 1)
 377
 378 /* Real values to IEEE 754 decimal floats.  */
 379
 380 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 381 #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \
 382   real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0))
 383
 384 #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
 385   real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0))
 386
 387 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 388 #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \
 389   ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0)))
 390
 391 extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode,
 392                                             REAL_VALUE_TYPE);
 393
 394 #define REAL_VALUE_TO_INT(plow, phigh, r) \
 395   real_to_integer2 (plow, phigh, &(r))
 396
 397 extern REAL_VALUE_TYPE real_arithmetic2 (int, const REAL_VALUE_TYPE *,
 398                                          const REAL_VALUE_TYPE *);
 399
 400 #define REAL_VALUE_NEGATE(X) \
 401   real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
 402
 403 #define REAL_VALUE_ABS(X) \
 404   real_arithmetic2 (ABS_EXPR, &(X), NULL)
 405
 406 extern int significand_size (enum machine_mode);
 407
 408 extern REAL_VALUE_TYPE real_from_string2 (const char *, enum machine_mode);
 409
 410 #define REAL_VALUE_ATOF(s, m) \
 411   real_from_string2 (s, m)
 412
 413 #define CONST_DOUBLE_ATOF(s, m) \
 414   CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
 415
 416 #define REAL_VALUE_FIX(r) \
 417   real_to_integer (&(r))
 418
 419 /* ??? Not quite right.  */
 420 #define REAL_VALUE_UNSIGNED_FIX(r) \
 421   real_to_integer (&(r))
 422
 423 /* ??? These were added for Paranoia support.  */
 424
 425 /* Return floor log2(R).  */
 426 extern int real_exponent (const REAL_VALUE_TYPE *);
 427
 428 /* R = A * 2**EXP.  */
 429 extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
 430
 431 /* **** End of software floating point emulator interface macros **** */
 432 \f
 433 /* Constant real values 0, 1, 2, -1 and 0.5.  */
 434
 435 extern REAL_VALUE_TYPE dconst0;
 436 extern REAL_VALUE_TYPE dconst1;
 437 extern REAL_VALUE_TYPE dconst2;
 438 extern REAL_VALUE_TYPE dconstm1;
 439 extern REAL_VALUE_TYPE dconsthalf;
 440
 441 #define dconst_e()  (*dconst_e_ptr ())
 442 #define dconst_third()  (*dconst_third_ptr ())
 443 #define dconst_sqrt2()  (*dconst_sqrt2_ptr ())
 444
 445 /* Function to return the real value special constant 'e'.  */
 446 extern const REAL_VALUE_TYPE * dconst_e_ptr (void);
 447
 448 /* Returns the special REAL_VALUE_TYPE corresponding to 1/3.  */
 449 extern const REAL_VALUE_TYPE * dconst_third_ptr (void);
 450
 451 /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2).  */
 452 extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void);
 453
 454 /* Function to return a real value (not a tree node)
 455    from a given integer constant.  */
 456 REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
 457
 458 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
 459 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
 460   ((to) = *CONST_DOUBLE_REAL_VALUE (from))
 461
 462 /* Return a CONST_DOUBLE with value R and mode M.  */
 463 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
 464   const_double_from_real_value (r, m)
 465 extern rtx const_double_from_real_value (REAL_VALUE_TYPE, enum machine_mode);
 466
 467 /* Replace R by 1/R in the given machine mode, if the result is exact.  */
 468 extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *);
 469
 470 /* Return true if arithmetic on values in IMODE that were promoted
 471    from values in TMODE is equivalent to direct arithmetic on values
 472    in TMODE.  */
 473 bool real_can_shorten_arithmetic (enum machine_mode, enum machine_mode);
 474
 475 /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node.  */
 476 extern tree build_real (tree, REAL_VALUE_TYPE);
 477
 478 /* Calculate R as the square root of X in the given machine mode.  */
 479 extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode,
 480                        const REAL_VALUE_TYPE *);
 481
 482 /* Calculate R as X raised to the integer exponent N in mode MODE.  */
 483 extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode,
 484                        const REAL_VALUE_TYPE *, HOST_WIDE_INT);
 485
 486 /* Standard round to integer value functions.  */
 487 extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode,
 488                         const REAL_VALUE_TYPE *);
 489 extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode,
 490                         const REAL_VALUE_TYPE *);
 491 extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode,
 492                        const REAL_VALUE_TYPE *);
 493 extern void real_round (REAL_VALUE_TYPE *, enum machine_mode,
 494                         const REAL_VALUE_TYPE *);
 495
 496 /* Set the sign of R to the sign of X.  */
 497 extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
 498
 499 #ifndef GENERATOR_FILE
 500 /* Convert between MPFR and REAL_VALUE_TYPE.  The caller is
 501    responsible for initializing and clearing the MPFR parameter.  */
 502
 503 extern void real_from_mpfr (REAL_VALUE_TYPE *, mpfr_srcptr, tree, mp_rnd_t);
 504 extern void mpfr_from_real (mpfr_ptr, const REAL_VALUE_TYPE *, mp_rnd_t);
 505 #endif
 506
 507 /* Check whether the real constant value given is an integer.  */
 508 extern bool real_isinteger (const REAL_VALUE_TYPE *c, enum machine_mode mode);
 509
 510 /* Write into BUF the maximum representable finite floating-point
 511    number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
 512    float string.  BUF must be large enough to contain the result.  */
 513 extern void get_max_float (const struct real_format *, char *, size_t);
 514 #endif /* ! GCC_REAL_H */