math/bits/mathcalls.h

   1 /* Prototype declarations for math functions; helper file for <math.h>.
   2    Copyright (C) 1996-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* NOTE: Because of the special way this file is used by <math.h>, this
  20    file must NOT be protected from multiple inclusion as header files
  21    usually are.
  22
  23    This file provides prototype declarations for the math functions.
  24    Most functions are declared using the macro:
  25
  26    __MATHCALL (NAME,[_r], (ARGS...));
  27
  28    This means there is a function `NAME' returning `double' and a function
  29    `NAMEf' returning `float'.  Each place `_Mdouble_' appears in the
  30    prototype, that is actually `double' in the prototype for `NAME' and
  31    `float' in the prototype for `NAMEf'.  Reentrant variant functions are
  32    called `NAME_r' and `NAMEf_r'.
  33
  34    Functions returning other types like `int' are declared using the macro:
  35
  36    __MATHDECL (TYPE, NAME,[_r], (ARGS...));
  37
  38    This is just like __MATHCALL but for a function returning `TYPE'
  39    instead of `_Mdouble_'.  In all of these cases, there is still
  40    both a `NAME' and a `NAMEf' that takes `float' arguments.
  41
  42    Note that there must be no whitespace before the argument passed for
  43    NAME, to make token pasting work with -traditional.  */
  44
  45 #ifndef _MATH_H
  46 # error "Never include <bits/mathcalls.h> directly; include <math.h> instead."
  47 #endif
  48
  49
  50 /* Trigonometric functions.  */
  51
  52 /* Arc cosine of X.  */
  53 __MATHCALL_VEC (acos,, (_Mdouble_ __x));
  54 /* Arc sine of X.  */
  55 __MATHCALL_VEC (asin,, (_Mdouble_ __x));
  56 /* Arc tangent of X.  */
  57 __MATHCALL_VEC (atan,, (_Mdouble_ __x));
  58 /* Arc tangent of Y/X.  */
  59 __MATHCALL (atan2,, (_Mdouble_ __y, _Mdouble_ __x));
  60
  61 /* Cosine of X.  */
  62 __MATHCALL_VEC (cos,, (_Mdouble_ __x));
  63 /* Sine of X.  */
  64 __MATHCALL_VEC (sin,, (_Mdouble_ __x));
  65 /* Tangent of X.  */
  66 __MATHCALL (tan,, (_Mdouble_ __x));
  67
  68 /* Hyperbolic functions.  */
  69
  70 /* Hyperbolic cosine of X.  */
  71 __MATHCALL_VEC (cosh,, (_Mdouble_ __x));
  72 /* Hyperbolic sine of X.  */
  73 __MATHCALL (sinh,, (_Mdouble_ __x));
  74 /* Hyperbolic tangent of X.  */
  75 __MATHCALL (tanh,, (_Mdouble_ __x));
  76
  77 #ifdef __USE_GNU
  78 /* Cosine and sine of X.  */
  79 __MATHDECL_VEC (void,sincos,,
  80                 (_Mdouble_ __x, _Mdouble_ *__sinx, _Mdouble_ *__cosx));
  81 #endif
  82
  83 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
  84 /* Hyperbolic arc cosine of X.  */
  85 __MATHCALL (acosh,, (_Mdouble_ __x));
  86 /* Hyperbolic arc sine of X.  */
  87 __MATHCALL (asinh,, (_Mdouble_ __x));
  88 /* Hyperbolic arc tangent of X.  */
  89 __MATHCALL (atanh,, (_Mdouble_ __x));
  90 #endif
  91
  92 /* Exponential and logarithmic functions.  */
  93
  94 /* Exponential function of X.  */
  95 __MATHCALL_VEC (exp,, (_Mdouble_ __x));
  96
  97 /* Break VALUE into a normalized fraction and an integral power of 2.  */
  98 __MATHCALL (frexp,, (_Mdouble_ __x, int *__exponent));
  99
 100 /* X times (two to the EXP power).  */
 101 __MATHCALL (ldexp,, (_Mdouble_ __x, int __exponent));
 102
 103 /* Natural logarithm of X.  */
 104 __MATHCALL_VEC (log,, (_Mdouble_ __x));
 105
 106 /* Base-ten logarithm of X.  */
 107 __MATHCALL (log10,, (_Mdouble_ __x));
 108
 109 /* Break VALUE into integral and fractional parts.  */
 110 __MATHCALL (modf,, (_Mdouble_ __x, _Mdouble_ *__iptr)) __nonnull ((2));
 111
 112 #if __GLIBC_USE (IEC_60559_FUNCS_EXT_C2X)
 113 /* Compute exponent to base ten.  */
 114 __MATHCALL_VEC (exp10,, (_Mdouble_ __x));
 115 #endif
 116
 117 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
 118 /* Return exp(X) - 1.  */
 119 __MATHCALL (expm1,, (_Mdouble_ __x));
 120
 121 /* Return log(1 + X).  */
 122 __MATHCALL (log1p,, (_Mdouble_ __x));
 123
 124 /* Return the base 2 signed integral exponent of X.  */
 125 __MATHCALL (logb,, (_Mdouble_ __x));
 126 #endif
 127
 128 #ifdef __USE_ISOC99
 129 /* Compute base-2 exponential of X.  */
 130 __MATHCALL_VEC (exp2,, (_Mdouble_ __x));
 131
 132 /* Compute base-2 logarithm of X.  */
 133 __MATHCALL (log2,, (_Mdouble_ __x));
 134 #endif
 135
 136
 137 /* Power functions.  */
 138
 139 /* Return X to the Y power.  */
 140 __MATHCALL_VEC (pow,, (_Mdouble_ __x, _Mdouble_ __y));
 141
 142 /* Return the square root of X.  */
 143 __MATHCALL (sqrt,, (_Mdouble_ __x));
 144
 145 #if defined __USE_XOPEN || defined __USE_ISOC99
 146 /* Return `sqrt(X*X + Y*Y)'.  */
 147 __MATHCALL_VEC (hypot,, (_Mdouble_ __x, _Mdouble_ __y));
 148 #endif
 149
 150 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
 151 /* Return the cube root of X.  */
 152 __MATHCALL (cbrt,, (_Mdouble_ __x));
 153 #endif
 154
 155
 156 /* Nearest integer, absolute value, and remainder functions.  */
 157
 158 /* Smallest integral value not less than X.  */
 159 __MATHCALLX (ceil,, (_Mdouble_ __x), (__const__));
 160
 161 /* Absolute value of X.  */
 162 __MATHCALLX (fabs,, (_Mdouble_ __x), (__const__));
 163
 164 /* Largest integer not greater than X.  */
 165 __MATHCALLX (floor,, (_Mdouble_ __x), (__const__));
 166
 167 /* Floating-point modulo remainder of X/Y.  */
 168 __MATHCALL (fmod,, (_Mdouble_ __x, _Mdouble_ __y));
 169
 170 #ifdef __USE_MISC
 171 # if ((!defined __cplusplus \
 172        || __cplusplus < 201103L /* isinf conflicts with C++11.  */ \
 173        || __MATH_DECLARING_DOUBLE == 0)) /* isinff or isinfl don't.  */ \
 174       && !__MATH_DECLARING_FLOATN
 175 /* Return 0 if VALUE is finite or NaN, +1 if it
 176    is +Infinity, -1 if it is -Infinity.  */
 177 __MATHDECL_ALIAS (int,isinf,, (_Mdouble_ __value), isinf)
 178   __attribute__ ((__const__));
 179 # endif
 180
 181 # if !__MATH_DECLARING_FLOATN
 182 /* Return nonzero if VALUE is finite and not NaN.  */
 183 __MATHDECL_ALIAS (int,finite,, (_Mdouble_ __value), finite)
 184   __attribute__ ((__const__));
 185
 186 /* Return the remainder of X/Y.  */
 187 __MATHCALL (drem,, (_Mdouble_ __x, _Mdouble_ __y));
 188
 189
 190 /* Return the fractional part of X after dividing out `ilogb (X)'.  */
 191 __MATHCALL (significand,, (_Mdouble_ __x));
 192 # endif
 193
 194 #endif /* Use misc.  */
 195
 196 #ifdef __USE_ISOC99
 197 /* Return X with its signed changed to Y's.  */
 198 __MATHCALLX (copysign,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 199 #endif
 200
 201 #ifdef __USE_ISOC99
 202 /* Return representation of qNaN for double type.  */
 203 __MATHCALL (nan,, (const char *__tagb));
 204 #endif
 205
 206
 207 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
 208 # if ((!defined __cplusplus \
 209        || __cplusplus < 201103L /* isnan conflicts with C++11.  */ \
 210        || __MATH_DECLARING_DOUBLE == 0)) /* isnanf or isnanl don't.  */ \
 211       && !__MATH_DECLARING_FLOATN
 212 /* Return nonzero if VALUE is not a number.  */
 213 __MATHDECL_ALIAS (int,isnan,, (_Mdouble_ __value), isnan)
 214   __attribute__ ((__const__));
 215 # endif
 216 #endif
 217
 218 #if defined __USE_MISC || (defined __USE_XOPEN && __MATH_DECLARING_DOUBLE)
 219 /* Bessel functions.  */
 220 __MATHCALL (j0,, (_Mdouble_));
 221 __MATHCALL (j1,, (_Mdouble_));
 222 __MATHCALL (jn,, (int, _Mdouble_));
 223 __MATHCALL (y0,, (_Mdouble_));
 224 __MATHCALL (y1,, (_Mdouble_));
 225 __MATHCALL (yn,, (int, _Mdouble_));
 226 #endif
 227
 228
 229 #if defined __USE_XOPEN || defined __USE_ISOC99
 230 /* Error and gamma functions.  */
 231 __MATHCALL (erf,, (_Mdouble_));
 232 __MATHCALL (erfc,, (_Mdouble_));
 233 __MATHCALL (lgamma,, (_Mdouble_));
 234 #endif
 235
 236 #ifdef __USE_ISOC99
 237 /* True gamma function.  */
 238 __MATHCALL (tgamma,, (_Mdouble_));
 239 #endif
 240
 241 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
 242 # if !__MATH_DECLARING_FLOATN
 243 /* Obsolete alias for `lgamma'.  */
 244 __MATHCALL (gamma,, (_Mdouble_));
 245 # endif
 246 #endif
 247
 248 #ifdef __USE_MISC
 249 /* Reentrant version of lgamma.  This function uses the global variable
 250    `signgam'.  The reentrant version instead takes a pointer and stores
 251    the value through it.  */
 252 __MATHCALL (lgamma,_r, (_Mdouble_, int *__signgamp));
 253 #endif
 254
 255
 256 #if defined __USE_XOPEN_EXTENDED || defined __USE_ISOC99
 257 /* Return the integer nearest X in the direction of the
 258    prevailing rounding mode.  */
 259 __MATHCALL (rint,, (_Mdouble_ __x));
 260
 261 /* Return X + epsilon if X < Y, X - epsilon if X > Y.  */
 262 __MATHCALL (nextafter,, (_Mdouble_ __x, _Mdouble_ __y));
 263 # if defined __USE_ISOC99 && !defined __LDBL_COMPAT && !__MATH_DECLARING_FLOATN
 264 __MATHCALL (nexttoward,, (_Mdouble_ __x, long double __y));
 265 # endif
 266
 267 # if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) || __MATH_DECLARING_FLOATN
 268 /* Return X - epsilon.  */
 269 __MATHCALL (nextdown,, (_Mdouble_ __x));
 270 /* Return X + epsilon.  */
 271 __MATHCALL (nextup,, (_Mdouble_ __x));
 272 # endif
 273
 274 /* Return the remainder of integer divison X / Y with infinite precision.  */
 275 __MATHCALL (remainder,, (_Mdouble_ __x, _Mdouble_ __y));
 276
 277 # ifdef __USE_ISOC99
 278 /* Return X times (2 to the Nth power).  */
 279 __MATHCALL (scalbn,, (_Mdouble_ __x, int __n));
 280 # endif
 281
 282 /* Return the binary exponent of X, which must be nonzero.  */
 283 __MATHDECL (int,ilogb,, (_Mdouble_ __x));
 284 #endif
 285
 286 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) || __MATH_DECLARING_FLOATN
 287 /* Like ilogb, but returning long int.  */
 288 __MATHDECL (long int, llogb,, (_Mdouble_ __x));
 289 #endif
 290
 291 #ifdef __USE_ISOC99
 292 /* Return X times (2 to the Nth power).  */
 293 __MATHCALL (scalbln,, (_Mdouble_ __x, long int __n));
 294
 295 /* Round X to integral value in floating-point format using current
 296    rounding direction, but do not raise inexact exception.  */
 297 __MATHCALL (nearbyint,, (_Mdouble_ __x));
 298
 299 /* Round X to nearest integral value, rounding halfway cases away from
 300    zero.  */
 301 __MATHCALLX (round,, (_Mdouble_ __x), (__const__));
 302
 303 /* Round X to the integral value in floating-point format nearest but
 304    not larger in magnitude.  */
 305 __MATHCALLX (trunc,, (_Mdouble_ __x), (__const__));
 306
 307 /* Compute remainder of X and Y and put in *QUO a value with sign of x/y
 308    and magnitude congruent `mod 2^n' to the magnitude of the integral
 309    quotient x/y, with n >= 3.  */
 310 __MATHCALL (remquo,, (_Mdouble_ __x, _Mdouble_ __y, int *__quo));
 311
 312
 313 /* Conversion functions.  */
 314
 315 /* Round X to nearest integral value according to current rounding
 316    direction.  */
 317 __MATHDECL (long int,lrint,, (_Mdouble_ __x));
 318 __extension__
 319 __MATHDECL (long long int,llrint,, (_Mdouble_ __x));
 320
 321 /* Round X to nearest integral value, rounding halfway cases away from
 322    zero.  */
 323 __MATHDECL (long int,lround,, (_Mdouble_ __x));
 324 __extension__
 325 __MATHDECL (long long int,llround,, (_Mdouble_ __x));
 326
 327
 328 /* Return positive difference between X and Y.  */
 329 __MATHCALL (fdim,, (_Mdouble_ __x, _Mdouble_ __y));
 330
 331 # if !__MATH_DECLARING_FLOATN || defined __USE_GNU || !__GLIBC_USE (ISOC2X)
 332 /* Return maximum numeric value from X and Y.  */
 333 __MATHCALLX (fmax,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 334
 335 /* Return minimum numeric value from X and Y.  */
 336 __MATHCALLX (fmin,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 337 # endif
 338
 339 /* Multiply-add function computed as a ternary operation.  */
 340 __MATHCALL (fma,, (_Mdouble_ __x, _Mdouble_ __y, _Mdouble_ __z));
 341 #endif /* Use ISO C99.  */
 342
 343 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) || __MATH_DECLARING_FLOATN
 344 /* Round X to nearest integer value, rounding halfway cases to even.  */
 345 __MATHCALLX (roundeven,, (_Mdouble_ __x), (__const__));
 346
 347 /* Round X to nearest signed integer value, not raising inexact, with
 348    control of rounding direction and width of result.  */
 349 __MATHDECL (__intmax_t, fromfp,, (_Mdouble_ __x, int __round,
 350                                   unsigned int __width));
 351
 352 /* Round X to nearest unsigned integer value, not raising inexact,
 353    with control of rounding direction and width of result.  */
 354 __MATHDECL (__uintmax_t, ufromfp,, (_Mdouble_ __x, int __round,
 355                                     unsigned int __width));
 356
 357 /* Round X to nearest signed integer value, raising inexact for
 358    non-integers, with control of rounding direction and width of
 359    result.  */
 360 __MATHDECL (__intmax_t, fromfpx,, (_Mdouble_ __x, int __round,
 361                                    unsigned int __width));
 362
 363 /* Round X to nearest unsigned integer value, raising inexact for
 364    non-integers, with control of rounding direction and width of
 365    result.  */
 366 __MATHDECL (__uintmax_t, ufromfpx,, (_Mdouble_ __x, int __round,
 367                                      unsigned int __width));
 368
 369 /* Canonicalize floating-point representation.  */
 370 __MATHDECL_1 (int, canonicalize,, (_Mdouble_ *__cx, const _Mdouble_ *__x));
 371 #endif
 372
 373 #if (__GLIBC_USE (IEC_60559_BFP_EXT)                            \
 374      || (__MATH_DECLARING_FLOATN                                \
 375          && (defined __USE_GNU || !__GLIBC_USE (ISOC2X))))
 376 /* Return value with maximum magnitude.  */
 377 __MATHCALLX (fmaxmag,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 378
 379 /* Return value with minimum magnitude.  */
 380 __MATHCALLX (fminmag,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 381 #endif
 382
 383 #if __GLIBC_USE (ISOC2X)
 384 /* Return maximum value from X and Y.  */
 385 __MATHCALLX (fmaximum,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 386
 387 /* Return minimum value from X and Y.  */
 388 __MATHCALLX (fminimum,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 389
 390 /* Return maximum numeric value from X and Y.  */
 391 __MATHCALLX (fmaximum_num,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 392
 393 /* Return minimum numeric value from X and Y.  */
 394 __MATHCALLX (fminimum_num,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 395
 396 /* Return value with maximum magnitude.  */
 397 __MATHCALLX (fmaximum_mag,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 398
 399 /* Return value with minimum magnitude.  */
 400 __MATHCALLX (fminimum_mag,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 401
 402 /* Return numeric value with maximum magnitude.  */
 403 __MATHCALLX (fmaximum_mag_num,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 404
 405 /* Return numeric value with minimum magnitude.  */
 406 __MATHCALLX (fminimum_mag_num,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
 407 #endif
 408
 409 #if __GLIBC_USE (IEC_60559_EXT) || __MATH_DECLARING_FLOATN
 410 /* Total order operation.  */
 411 __MATHDECL_1 (int, totalorder,, (const _Mdouble_ *__x,
 412                                  const _Mdouble_ *__y))
 413      __attribute_pure__;
 414
 415 /* Total order operation on absolute values.  */
 416 __MATHDECL_1 (int, totalordermag,, (const _Mdouble_ *__x,
 417                                     const _Mdouble_ *__y))
 418      __attribute_pure__;
 419
 420 /* Get NaN payload.  */
 421 __MATHCALL (getpayload,, (const _Mdouble_ *__x));
 422
 423 /* Set quiet NaN payload.  */
 424 __MATHDECL_1 (int, setpayload,, (_Mdouble_ *__x, _Mdouble_ __payload));
 425
 426 /* Set signaling NaN payload.  */
 427 __MATHDECL_1 (int, setpayloadsig,, (_Mdouble_ *__x, _Mdouble_ __payload));
 428 #endif
 429
 430 #if (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
 431                             && __MATH_DECLARING_DOUBLE    \
 432                             && !defined __USE_XOPEN2K8))  \
 433      && !__MATH_DECLARING_FLOATN
 434 /* Return X times (2 to the Nth power).  */
 435 __MATHCALL (scalb,, (_Mdouble_ __x, _Mdouble_ __n));
 436 #endif