1 /* Declarations for math functions.
2 Copyright (C) 1991-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
20 * ISO C99 Standard: 7.12 Mathematics <math.h>
30 /* Get machine-dependent vector math functions declarations. */
31 #include <bits/math-vector.h>
33 /* Get machine-dependent HUGE_VAL value (returned on overflow).
34 On all IEEE754 machines, this is +Infinity. */
35 #include <bits/huge_val.h>
37 # include <bits/huge_valf.h>
38 # include <bits/huge_vall.h>
40 /* Get machine-dependent INFINITY value. */
41 # include <bits/inf.h>
43 /* Get machine-dependent NAN value (returned for some domain errors). */
44 # include <bits/nan.h>
45 #endif /* __USE_ISOC99 */
47 /* Get general and ISO C99 specific information. */
48 #include <bits/mathdef.h>
50 /* The file <bits/mathcalls.h> contains the prototypes for all the
51 actual math functions. These macros are used for those prototypes,
52 so we can easily declare each function as both `name' and `__name',
53 and can declare the float versions `namef' and `__namef'. */
55 #define __SIMD_DECL(function) __CONCAT (__DECL_SIMD_, function)
57 #define __MATHCALL_VEC(function, suffix, args) \
58 __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
59 __MATHCALL (function, suffix, args)
61 #define __MATHDECL_VEC(type, function,suffix, args) \
62 __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
63 __MATHDECL(type, function,suffix, args)
65 #define __MATHCALL(function,suffix, args) \
66 __MATHDECL (_Mdouble_,function,suffix, args)
67 #define __MATHDECL(type, function,suffix, args) \
68 __MATHDECL_1(type, function,suffix, args); \
69 __MATHDECL_1(type, __CONCAT(__,function),suffix, args)
70 #define __MATHCALLX(function,suffix, args, attrib) \
71 __MATHDECLX (_Mdouble_,function,suffix, args, attrib)
72 #define __MATHDECLX(type, function,suffix, args, attrib) \
73 __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib); \
74 __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib)
75 #define __MATHDECL_1(type, function,suffix, args) \
76 extern type __MATH_PRECNAME(function,suffix) args __THROW
78 #define _Mdouble_ double
79 #define __MATH_PRECNAME(name,r) __CONCAT(name,r)
80 #define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_STD
81 #define _Mdouble_END_NAMESPACE __END_NAMESPACE_STD
82 #include <bits/mathcalls.h>
84 #undef _Mdouble_BEGIN_NAMESPACE
85 #undef _Mdouble_END_NAMESPACE
86 #undef __MATH_PRECNAME
91 /* Include the file of declarations again, this time using `float'
92 instead of `double' and appending f to each function name. */
95 # define _Mfloat_ float
97 # define _Mdouble_ _Mfloat_
98 # define __MATH_PRECNAME(name,r) name##f##r
99 # define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99
100 # define _Mdouble_END_NAMESPACE __END_NAMESPACE_C99
101 # include <bits/mathcalls.h>
103 # undef _Mdouble_BEGIN_NAMESPACE
104 # undef _Mdouble_END_NAMESPACE
105 # undef __MATH_PRECNAME
107 # if !(defined __NO_LONG_DOUBLE_MATH && defined _LIBC) \
108 || defined __LDBL_COMPAT \
109 || defined _LIBC_TEST
110 # ifdef __LDBL_COMPAT
113 extern float __nldbl_nexttowardf (float __x
, long double __y
)
114 __THROW
__attribute__ ((__const__
));
115 # ifdef __REDIRECT_NTH
116 extern float __REDIRECT_NTH (nexttowardf
, (float __x
, long double __y
),
118 __attribute__ ((__const__
));
119 extern double __REDIRECT_NTH (nexttoward
, (double __x
, long double __y
),
120 nextafter
) __attribute__ ((__const__
));
121 extern long double __REDIRECT_NTH (nexttowardl
,
122 (long double __x
, long double __y
),
123 nextafter
) __attribute__ ((__const__
));
128 # define __MATHDECL_2(type, function,suffix, args, alias) \
129 extern type __REDIRECT_NTH(__MATH_PRECNAME(function,suffix), \
131 # define __MATHDECL_1(type, function,suffix, args) \
132 __MATHDECL_2(type, function,suffix, args, __CONCAT(function,suffix))
135 /* Include the file of declarations again, this time using `long double'
136 instead of `double' and appending l to each function name. */
138 # ifndef _Mlong_double_
139 # define _Mlong_double_ long double
141 # define _Mdouble_ _Mlong_double_
142 # define __MATH_PRECNAME(name,r) name##l##r
143 # define _Mdouble_BEGIN_NAMESPACE __BEGIN_NAMESPACE_C99
144 # define _Mdouble_END_NAMESPACE __END_NAMESPACE_C99
145 # define __MATH_DECLARE_LDOUBLE 1
146 # include <bits/mathcalls.h>
148 # undef _Mdouble_BEGIN_NAMESPACE
149 # undef _Mdouble_END_NAMESPACE
150 # undef __MATH_PRECNAME
152 # endif /* !(__NO_LONG_DOUBLE_MATH && _LIBC) || __LDBL_COMPAT */
154 #endif /* Use ISO C99. */
160 #if defined __USE_MISC || defined __USE_XOPEN
161 /* This variable is used by `gamma' and `lgamma'. */
166 /* ISO C99 defines some generic macros which work on any data type. */
169 /* Get the architecture specific values describing the floating-point
170 evaluation. The following symbols will get defined:
172 float_t floating-point type at least as wide as `float' used
173 to evaluate `float' expressions
174 double_t floating-point type at least as wide as `double' used
175 to evaluate `double' expressions
179 0 if `float_t' is `float' and `double_t' is `double'
180 1 if `float_t' and `double_t' are `double'
181 2 if `float_t' and `double_t' are `long double'
182 else `float_t' and `double_t' are unspecified
184 INFINITY representation of the infinity value of type `float'
189 If defined it indicates that the `fma' function
190 generally executes about as fast as a multiply and an add.
191 This macro is defined only iff the `fma' function is
192 implemented directly with a hardware multiply-add instructions.
194 FP_ILOGB0 Expands to a value returned by `ilogb (0.0)'.
195 FP_ILOGBNAN Expands to a value returned by `ilogb (NAN)'.
197 DECIMAL_DIG Number of decimal digits supported by conversion between
198 decimal and all internal floating-point formats.
202 /* All floating-point numbers can be put in one of these categories. */
209 # define FP_INFINITE 1
215 # define FP_SUBNORMAL 3
222 /* Return number of classification appropriate for X. */
223 # ifdef __NO_LONG_DOUBLE_MATH
224 # define fpclassify(x) \
225 (sizeof (x) == sizeof (float) ? __fpclassifyf (x) : __fpclassify (x))
227 # define fpclassify(x) \
228 (sizeof (x) == sizeof (float) \
229 ? __fpclassifyf (x) \
230 : sizeof (x) == sizeof (double) \
231 ? __fpclassify (x) : __fpclassifyl (x))
234 /* Return nonzero value if sign of X is negative. */
235 # ifdef __NO_LONG_DOUBLE_MATH
236 # define signbit(x) \
237 (sizeof (x) == sizeof (float) ? __signbitf (x) : __signbit (x))
239 # define signbit(x) \
240 (sizeof (x) == sizeof (float) \
242 : sizeof (x) == sizeof (double) \
243 ? __signbit (x) : __signbitl (x))
246 /* Return nonzero value if X is not +-Inf or NaN. */
247 # ifdef __NO_LONG_DOUBLE_MATH
248 # define isfinite(x) \
249 (sizeof (x) == sizeof (float) ? __finitef (x) : __finite (x))
251 # define isfinite(x) \
252 (sizeof (x) == sizeof (float) \
254 : sizeof (x) == sizeof (double) \
255 ? __finite (x) : __finitel (x))
258 /* Return nonzero value if X is neither zero, subnormal, Inf, nor NaN. */
259 # define isnormal(x) (fpclassify (x) == FP_NORMAL)
261 /* Return nonzero value if X is a NaN. We could use `fpclassify' but
262 we already have this functions `__isnan' and it is faster. */
263 # ifdef __NO_LONG_DOUBLE_MATH
265 (sizeof (x) == sizeof (float) ? __isnanf (x) : __isnan (x))
268 (sizeof (x) == sizeof (float) \
270 : sizeof (x) == sizeof (double) \
271 ? __isnan (x) : __isnanl (x))
274 /* Return nonzero value if X is positive or negative infinity. */
275 # ifdef __NO_LONG_DOUBLE_MATH
277 (sizeof (x) == sizeof (float) ? __isinff (x) : __isinf (x))
280 (sizeof (x) == sizeof (float) \
282 : sizeof (x) == sizeof (double) \
283 ? __isinf (x) : __isinfl (x))
286 /* Bitmasks for the math_errhandling macro. */
287 # define MATH_ERRNO 1 /* errno set by math functions. */
288 # define MATH_ERREXCEPT 2 /* Exceptions raised by math functions. */
290 /* By default all functions support both errno and exception handling.
291 In gcc's fast math mode and if inline functions are defined this
292 might not be true. */
293 # ifndef __FAST_MATH__
294 # define math_errhandling (MATH_ERRNO | MATH_ERREXCEPT)
297 #endif /* Use ISO C99. */
300 /* Return nonzero value if X is a signaling NaN. */
301 # ifdef __NO_LONG_DOUBLE_MATH
302 # define issignaling(x) \
303 (sizeof (x) == sizeof (float) ? __issignalingf (x) : __issignaling (x))
305 # define issignaling(x) \
306 (sizeof (x) == sizeof (float) \
307 ? __issignalingf (x) \
308 : sizeof (x) == sizeof (double) \
309 ? __issignaling (x) : __issignalingl (x))
311 #endif /* Use GNU. */
314 /* Support for various different standard error handling behaviors. */
317 _IEEE_
= -1, /* According to IEEE 754/IEEE 854. */
318 _SVID_
, /* According to System V, release 4. */
319 _XOPEN_
, /* Nowadays also Unix98. */
321 _ISOC_
/* Actually this is ISO C99. */
324 /* This variable can be changed at run-time to any of the values above to
325 affect floating point error handling behavior (it may also be necessary
326 to change the hardware FPU exception settings). */
327 extern _LIB_VERSION_TYPE _LIB_VERSION
;
332 /* In SVID error handling, `matherr' is called with this description
333 of the exceptional condition.
335 We have a problem when using C++ since `exception' is a reserved
351 extern int matherr (struct __exception
*__exc
) throw ();
353 extern int matherr (struct exception
*__exc
);
356 # define X_TLOSS 1.41484755040568800000e+16
358 /* Types of exceptions in the `type' field. */
366 /* SVID mode specifies returning this large value instead of infinity. */
367 # define HUGE 3.40282347e+38F
372 /* X/Open wants another strange constant. */
373 # define MAXFLOAT 3.40282347e+38F
379 /* Some useful constants. */
380 #if defined __USE_MISC || defined __USE_XOPEN
381 # define M_E 2.7182818284590452354 /* e */
382 # define M_LOG2E 1.4426950408889634074 /* log_2 e */
383 # define M_LOG10E 0.43429448190325182765 /* log_10 e */
384 # define M_LN2 0.69314718055994530942 /* log_e 2 */
385 # define M_LN10 2.30258509299404568402 /* log_e 10 */
386 # define M_PI 3.14159265358979323846 /* pi */
387 # define M_PI_2 1.57079632679489661923 /* pi/2 */
388 # define M_PI_4 0.78539816339744830962 /* pi/4 */
389 # define M_1_PI 0.31830988618379067154 /* 1/pi */
390 # define M_2_PI 0.63661977236758134308 /* 2/pi */
391 # define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi) */
392 # define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
393 # define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
396 /* The above constants are not adequate for computation using `long double's.
397 Therefore we provide as an extension constants with similar names as a
398 GNU extension. Provide enough digits for the 128-bit IEEE quad. */
400 # define M_El 2.718281828459045235360287471352662498L /* e */
401 # define M_LOG2El 1.442695040888963407359924681001892137L /* log_2 e */
402 # define M_LOG10El 0.434294481903251827651128918916605082L /* log_10 e */
403 # define M_LN2l 0.693147180559945309417232121458176568L /* log_e 2 */
404 # define M_LN10l 2.302585092994045684017991454684364208L /* log_e 10 */
405 # define M_PIl 3.141592653589793238462643383279502884L /* pi */
406 # define M_PI_2l 1.570796326794896619231321691639751442L /* pi/2 */
407 # define M_PI_4l 0.785398163397448309615660845819875721L /* pi/4 */
408 # define M_1_PIl 0.318309886183790671537767526745028724L /* 1/pi */
409 # define M_2_PIl 0.636619772367581343075535053490057448L /* 2/pi */
410 # define M_2_SQRTPIl 1.128379167095512573896158903121545172L /* 2/sqrt(pi) */
411 # define M_SQRT2l 1.414213562373095048801688724209698079L /* sqrt(2) */
412 # define M_SQRT1_2l 0.707106781186547524400844362104849039L /* 1/sqrt(2) */
416 /* When compiling in strict ISO C compatible mode we must not use the
417 inline functions since they, among other things, do not set the
418 `errno' variable correctly. */
419 #if defined __STRICT_ANSI__ && !defined __NO_MATH_INLINES
420 # define __NO_MATH_INLINES 1
423 #if defined __USE_ISOC99 && __GNUC_PREREQ(2,97)
424 /* ISO C99 defines some macros to compare number while taking care for
425 unordered numbers. Many FPUs provide special instructions to support
426 these operations. Generic support in GCC for these as builtins went
427 in before 3.0.0, but not all cpus added their patterns. We define
428 versions that use the builtins here, and <bits/mathinline.h> will
429 undef/redefine as appropriate for the specific GCC version in use. */
430 # define isgreater(x, y) __builtin_isgreater(x, y)
431 # define isgreaterequal(x, y) __builtin_isgreaterequal(x, y)
432 # define isless(x, y) __builtin_isless(x, y)
433 # define islessequal(x, y) __builtin_islessequal(x, y)
434 # define islessgreater(x, y) __builtin_islessgreater(x, y)
435 # define isunordered(u, v) __builtin_isunordered(u, v)
438 /* Get machine-dependent inline versions (if there are any). */
439 #ifdef __USE_EXTERN_INLINES
440 # include <bits/mathinline.h>
443 /* Define special entry points to use when the compiler got told to
444 only expect finite results. */
445 #if defined __FINITE_MATH_ONLY__ && __FINITE_MATH_ONLY__ > 0
446 # include <bits/math-finite.h>
450 /* If we've still got undefined comparison macros, provide defaults. */
452 /* Return nonzero value if X is greater than Y. */
454 # define isgreater(x, y) \
456 ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y); \
457 !isunordered (__x, __y) && __x > __y; }))
460 /* Return nonzero value if X is greater than or equal to Y. */
461 # ifndef isgreaterequal
462 # define isgreaterequal(x, y) \
464 ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y); \
465 !isunordered (__x, __y) && __x >= __y; }))
468 /* Return nonzero value if X is less than Y. */
470 # define isless(x, y) \
472 ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y); \
473 !isunordered (__x, __y) && __x < __y; }))
476 /* Return nonzero value if X is less than or equal to Y. */
478 # define islessequal(x, y) \
480 ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y); \
481 !isunordered (__x, __y) && __x <= __y; }))
484 /* Return nonzero value if either X is less than Y or Y is less than X. */
485 # ifndef islessgreater
486 # define islessgreater(x, y) \
488 ({ __typeof__(x) __x = (x); __typeof__(y) __y = (y); \
489 !isunordered (__x, __y) && (__x < __y || __y < __x); }))
492 /* Return nonzero value if arguments are unordered. */
494 # define isunordered(u, v) \
496 ({ __typeof__(u) __u = (u); __typeof__(v) __v = (v); \
497 fpclassify (__u) == FP_NAN || fpclassify (__v) == FP_NAN; }))