1 /* A GNU-like <math.h>.
3 Copyright (C) 2002-2003, 2007-2011 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program 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
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 #ifndef _@GUARD_PREFIX@_MATH_H
21 @PRAGMA_SYSTEM_HEADER@
25 /* The include_next requires a split double-inclusion guard. */
26 #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_MATH_H@
28 #ifndef _@GUARD_PREFIX@_MATH_H
29 #define _@GUARD_PREFIX@_MATH_H
32 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here. */
34 /* The definition of _GL_ARG_NONNULL is copied here. */
36 /* The definition of _GL_WARN_ON_USE is copied here. */
38 /* Helper macros to define a portability warning for the
39 classification macro FUNC called with VALUE. POSIX declares the
40 classification macros with an argument of real-floating (that is,
41 one of float, double, or long double). */
42 #define _GL_WARN_REAL_FLOATING_DECL(func) \
44 rpl_ ## func ## f (float f) \
49 rpl_ ## func ## d (double d) \
54 rpl_ ## func ## l (long double l) \
58 _GL_WARN_ON_USE (rpl_ ## func ## f, #func " is unportable - " \
59 "use gnulib module " #func " for portability"); \
60 _GL_WARN_ON_USE (rpl_ ## func ## d, #func " is unportable - " \
61 "use gnulib module " #func " for portability"); \
62 _GL_WARN_ON_USE (rpl_ ## func ## l, #func " is unportable - " \
63 "use gnulib module " #func " for portability")
64 #define _GL_WARN_REAL_FLOATING_IMPL(func, value) \
65 (sizeof (value) == sizeof (float) ? rpl_ ## func ## f (value) \
66 : sizeof (value) == sizeof (double) ? rpl_ ## func ## d (value) \
67 : rpl_ ## func ## l (value))
71 /* Pull in a function that fixes the 'int' to 'long double' conversion
73 _GL_EXTERN_C void _Qp_itoq (long double *, int);
74 static void (*_gl_math_fix_itold) (long double *, int) = _Qp_itoq;
78 /* POSIX allows platforms that don't support NAN. But all major
79 machines in the past 15 years have supported something close to
80 IEEE NaN, so we define this unconditionally. We also must define
81 it on platforms like Solaris 10, where NAN is present but defined
82 as a function pointer rather than a floating point constant. */
83 #if !defined NAN || @REPLACE_NAN@
84 # if !GNULIB_defined_NAN
86 /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler
87 choke on the expression 0.0 / 0.0. */
88 # if defined __DECC || defined _MSC_VER
92 static float zero = 0.0f;
97 # define NAN (0.0f / 0.0f)
99 # define GNULIB_defined_NAN 1
103 /* Solaris 10 defines HUGE_VAL, but as a function pointer rather
104 than a floating point constant. */
105 #if @REPLACE_HUGE_VAL@
107 # define HUGE_VAL (1.0 / 0.0)
114 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
115 If x is zero: mantissa = x, exp = 0.
116 If x is infinite or NaN: mantissa = x, exp unspecified.
117 Store exp in *EXPPTR and return mantissa. */
120 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
121 # define frexp rpl_frexp
123 _GL_FUNCDECL_RPL (frexp, double, (double x, int *expptr) _GL_ARG_NONNULL ((2)));
124 _GL_CXXALIAS_RPL (frexp, double, (double x, int *expptr));
126 _GL_CXXALIAS_SYS (frexp, double, (double x, int *expptr));
128 _GL_CXXALIASWARN (frexp);
129 #elif defined GNULIB_POSIXCHECK
131 /* Assume frexp is always declared. */
132 _GL_WARN_ON_USE (frexp, "frexp is unportable - "
133 "use gnulib module frexp for portability");
138 # if !@HAVE_DECL_LOGB@
139 _GL_EXTERN_C double logb (double x);
141 #elif defined GNULIB_POSIXCHECK
143 # if HAVE_RAW_DECL_LOGB
144 _GL_WARN_ON_USE (logb, "logb is unportable - "
145 "use gnulib module logb for portability");
151 # if !@HAVE_ACOSL@ || !@HAVE_DECL_ACOSL@
152 _GL_FUNCDECL_SYS (acosl, long double, (long double x));
154 _GL_CXXALIAS_SYS (acosl, long double, (long double x));
155 _GL_CXXALIASWARN (acosl);
156 #elif defined GNULIB_POSIXCHECK
158 # if HAVE_RAW_DECL_ACOSL
159 _GL_WARN_ON_USE (acosl, "acosl is unportable - "
160 "use gnulib module mathl for portability");
166 # if !@HAVE_ASINL@ || !@HAVE_DECL_ASINL@
167 _GL_FUNCDECL_SYS (asinl, long double, (long double x));
169 _GL_CXXALIAS_SYS (asinl, long double, (long double x));
170 _GL_CXXALIASWARN (asinl);
171 #elif defined GNULIB_POSIXCHECK
173 # if HAVE_RAW_DECL_ASINL
174 _GL_WARN_ON_USE (asinl, "asinl is unportable - "
175 "use gnulib module mathl for portability");
181 # if !@HAVE_ATANL@ || !@HAVE_DECL_ATANL@
182 _GL_FUNCDECL_SYS (atanl, long double, (long double x));
184 _GL_CXXALIAS_SYS (atanl, long double, (long double x));
185 _GL_CXXALIASWARN (atanl);
186 #elif defined GNULIB_POSIXCHECK
188 # if HAVE_RAW_DECL_ATANL
189 _GL_WARN_ON_USE (atanl, "atanl is unportable - "
190 "use gnulib module mathl for portability");
197 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
199 # define ceilf rpl_ceilf
201 _GL_FUNCDECL_RPL (ceilf, float, (float x));
202 _GL_CXXALIAS_RPL (ceilf, float, (float x));
204 # if !@HAVE_DECL_CEILF@
205 _GL_FUNCDECL_SYS (ceilf, float, (float x));
207 _GL_CXXALIAS_SYS (ceilf, float, (float x));
209 _GL_CXXALIASWARN (ceilf);
210 #elif defined GNULIB_POSIXCHECK
212 # if HAVE_RAW_DECL_CEILF
213 _GL_WARN_ON_USE (ceilf, "ceilf is unportable - "
214 "use gnulib module ceilf for portability");
220 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
221 # define ceil rpl_ceil
223 _GL_FUNCDECL_RPL (ceil, double, (double x));
224 _GL_CXXALIAS_RPL (ceil, double, (double x));
226 _GL_CXXALIAS_SYS (ceil, double, (double x));
228 _GL_CXXALIASWARN (ceil);
233 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
235 # define ceill rpl_ceill
237 _GL_FUNCDECL_RPL (ceill, long double, (long double x));
238 _GL_CXXALIAS_RPL (ceill, long double, (long double x));
240 # if !@HAVE_DECL_CEILL@
241 _GL_FUNCDECL_SYS (ceill, long double, (long double x));
243 _GL_CXXALIAS_SYS (ceill, long double, (long double x));
245 _GL_CXXALIASWARN (ceill);
246 #elif defined GNULIB_POSIXCHECK
248 # if HAVE_RAW_DECL_CEILL
249 _GL_WARN_ON_USE (ceill, "ceill is unportable - "
250 "use gnulib module ceill for portability");
256 # if !@HAVE_COSL@ || !@HAVE_DECL_COSL@
257 _GL_FUNCDECL_SYS (cosl, long double, (long double x));
259 _GL_CXXALIAS_SYS (cosl, long double, (long double x));
260 _GL_CXXALIASWARN (cosl);
261 #elif defined GNULIB_POSIXCHECK
263 # if HAVE_RAW_DECL_COSL
264 _GL_WARN_ON_USE (cosl, "cosl is unportable - "
265 "use gnulib module mathl for portability");
271 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
272 _GL_FUNCDECL_SYS (expl, long double, (long double x));
274 _GL_CXXALIAS_SYS (expl, long double, (long double x));
275 _GL_CXXALIASWARN (expl);
276 #elif defined GNULIB_POSIXCHECK
278 # if HAVE_RAW_DECL_EXPL
279 _GL_WARN_ON_USE (expl, "expl is unportable - "
280 "use gnulib module mathl for portability");
286 # if @REPLACE_FLOORF@
287 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
289 # define floorf rpl_floorf
291 _GL_FUNCDECL_RPL (floorf, float, (float x));
292 _GL_CXXALIAS_RPL (floorf, float, (float x));
294 # if !@HAVE_DECL_FLOORF@
295 _GL_FUNCDECL_SYS (floorf, float, (float x));
297 _GL_CXXALIAS_SYS (floorf, float, (float x));
299 _GL_CXXALIASWARN (floorf);
300 #elif defined GNULIB_POSIXCHECK
302 # if HAVE_RAW_DECL_FLOORF
303 _GL_WARN_ON_USE (floorf, "floorf is unportable - "
304 "use gnulib module floorf for portability");
310 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
311 # define floor rpl_floor
313 _GL_FUNCDECL_RPL (floor, double, (double x));
314 _GL_CXXALIAS_RPL (floor, double, (double x));
316 _GL_CXXALIAS_SYS (floor, double, (double x));
318 _GL_CXXALIASWARN (floor);
322 # if @REPLACE_FLOORL@
323 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
325 # define floorl rpl_floorl
327 _GL_FUNCDECL_RPL (floorl, long double, (long double x));
328 _GL_CXXALIAS_RPL (floorl, long double, (long double x));
330 # if !@HAVE_DECL_FLOORL@
331 _GL_FUNCDECL_SYS (floorl, long double, (long double x));
333 _GL_CXXALIAS_SYS (floorl, long double, (long double x));
335 _GL_CXXALIASWARN (floorl);
336 #elif defined GNULIB_POSIXCHECK
338 # if HAVE_RAW_DECL_FLOORL
339 _GL_WARN_ON_USE (floorl, "floorl is unportable - "
340 "use gnulib module floorl for portability");
348 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
349 If x is zero: mantissa = x, exp = 0.
350 If x is infinite or NaN: mantissa = x, exp unspecified.
351 Store exp in *EXPPTR and return mantissa. */
352 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
353 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
355 # define frexpl rpl_frexpl
357 _GL_FUNCDECL_RPL (frexpl, long double,
358 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
359 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
361 # if !@HAVE_DECL_FREXPL@
362 _GL_FUNCDECL_SYS (frexpl, long double,
363 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
366 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
369 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
370 _GL_CXXALIASWARN (frexpl);
372 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
374 # if HAVE_RAW_DECL_FREXPL
375 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
376 "use gnulib module frexpl for portability");
381 /* Return x * 2^exp. */
382 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
383 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
385 # define ldexpl rpl_ldexpl
387 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
388 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
390 # if !@HAVE_DECL_LDEXPL@
391 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
394 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
398 _GL_CXXALIASWARN (ldexpl);
400 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
402 # if HAVE_RAW_DECL_LDEXPL
403 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
404 "use gnulib module ldexpl for portability");
410 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
411 _GL_FUNCDECL_SYS (logl, long double, (long double x));
413 _GL_CXXALIAS_SYS (logl, long double, (long double x));
414 _GL_CXXALIASWARN (logl);
415 #elif defined GNULIB_POSIXCHECK
417 # if HAVE_RAW_DECL_LOGL
418 _GL_WARN_ON_USE (logl, "logl is unportable - "
419 "use gnulib module mathl for portability");
425 # if @REPLACE_ROUNDF@
426 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
428 # define roundf rpl_roundf
430 _GL_FUNCDECL_RPL (roundf, float, (float x));
431 _GL_CXXALIAS_RPL (roundf, float, (float x));
433 # if !@HAVE_DECL_ROUNDF@
434 _GL_FUNCDECL_SYS (roundf, float, (float x));
436 _GL_CXXALIAS_SYS (roundf, float, (float x));
438 _GL_CXXALIASWARN (roundf);
439 #elif defined GNULIB_POSIXCHECK
441 # if HAVE_RAW_DECL_ROUNDF
442 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
443 "use gnulib module roundf for portability");
449 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
451 # define round rpl_round
453 _GL_FUNCDECL_RPL (round, double, (double x));
454 _GL_CXXALIAS_RPL (round, double, (double x));
456 # if !@HAVE_DECL_ROUND@
457 _GL_FUNCDECL_SYS (round, double, (double x));
459 _GL_CXXALIAS_SYS (round, double, (double x));
461 _GL_CXXALIASWARN (round);
462 #elif defined GNULIB_POSIXCHECK
464 # if HAVE_RAW_DECL_ROUND
465 _GL_WARN_ON_USE (round, "round is unportable - "
466 "use gnulib module round for portability");
471 # if @REPLACE_ROUNDL@
472 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
474 # define roundl rpl_roundl
476 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
477 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
479 # if !@HAVE_DECL_ROUNDL@
480 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
482 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
484 _GL_CXXALIASWARN (roundl);
485 #elif defined GNULIB_POSIXCHECK
487 # if HAVE_RAW_DECL_ROUNDL
488 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
489 "use gnulib module roundl for portability");
495 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
496 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
498 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
499 _GL_CXXALIASWARN (sinl);
500 #elif defined GNULIB_POSIXCHECK
502 # if HAVE_RAW_DECL_SINL
503 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
504 "use gnulib module mathl for portability");
510 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
511 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
513 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
514 _GL_CXXALIASWARN (sqrtl);
515 #elif defined GNULIB_POSIXCHECK
517 # if HAVE_RAW_DECL_SQRTL
518 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
519 "use gnulib module mathl for portability");
525 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
526 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
528 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
529 _GL_CXXALIASWARN (tanl);
530 #elif defined GNULIB_POSIXCHECK
532 # if HAVE_RAW_DECL_TANL
533 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
534 "use gnulib module mathl for portability");
540 # if @REPLACE_TRUNCF@
541 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
542 # define truncf rpl_truncf
544 _GL_FUNCDECL_RPL (truncf, float, (float x));
545 _GL_CXXALIAS_RPL (truncf, float, (float x));
547 # if !@HAVE_DECL_TRUNCF@
548 _GL_FUNCDECL_SYS (truncf, float, (float x));
550 _GL_CXXALIAS_SYS (truncf, float, (float x));
552 _GL_CXXALIASWARN (truncf);
553 #elif defined GNULIB_POSIXCHECK
555 # if HAVE_RAW_DECL_TRUNCF
556 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
557 "use gnulib module truncf for portability");
563 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
564 # define trunc rpl_trunc
566 _GL_FUNCDECL_RPL (trunc, double, (double x));
567 _GL_CXXALIAS_RPL (trunc, double, (double x));
569 # if !@HAVE_DECL_TRUNC@
570 _GL_FUNCDECL_SYS (trunc, double, (double x));
572 _GL_CXXALIAS_SYS (trunc, double, (double x));
574 _GL_CXXALIASWARN (trunc);
575 #elif defined GNULIB_POSIXCHECK
577 # if HAVE_RAW_DECL_TRUNC
578 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
579 "use gnulib module trunc for portability");
584 # if @REPLACE_TRUNCL@
585 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
587 # define truncl rpl_truncl
589 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
590 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
592 # if !@HAVE_DECL_TRUNCL@
593 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
595 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
597 _GL_CXXALIASWARN (truncl);
598 #elif defined GNULIB_POSIXCHECK
600 # if HAVE_RAW_DECL_TRUNCL
601 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
602 "use gnulib module truncl for portability");
607 #if @GNULIB_ISFINITE@
608 # if @REPLACE_ISFINITE@
609 _GL_EXTERN_C int gl_isfinitef (float x);
610 _GL_EXTERN_C int gl_isfinited (double x);
611 _GL_EXTERN_C int gl_isfinitel (long double x);
613 # define isfinite(x) \
614 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
615 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
618 #elif defined GNULIB_POSIXCHECK
619 # if defined isfinite
620 _GL_WARN_REAL_FLOATING_DECL (isfinite);
622 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
629 _GL_EXTERN_C int gl_isinff (float x);
630 _GL_EXTERN_C int gl_isinfd (double x);
631 _GL_EXTERN_C int gl_isinfl (long double x);
634 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
635 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
638 #elif defined GNULIB_POSIXCHECK
640 _GL_WARN_REAL_FLOATING_DECL (isinf);
642 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
648 /* Test for NaN for 'float' numbers. */
650 /* The original <math.h> included above provides a declaration of isnan macro
651 or (older) isnanf function. */
653 /* GCC 4.0 and newer provides three built-ins for isnan. */
655 # define isnanf(x) __builtin_isnanf ((float)(x))
658 # define isnanf(x) isnan ((float)(x))
661 /* Test whether X is a NaN. */
663 # define isnanf rpl_isnanf
664 _GL_EXTERN_C int isnanf (float x);
669 /* Test for NaN for 'double' numbers.
670 This function is a gnulib extension, unlike isnan() which applied only
671 to 'double' numbers earlier but now is a type-generic macro. */
673 /* The original <math.h> included above provides a declaration of isnan
676 /* GCC 4.0 and newer provides three built-ins for isnan. */
678 # define isnand(x) __builtin_isnan ((double)(x))
681 # define isnand(x) isnan ((double)(x))
684 /* Test whether X is a NaN. */
686 # define isnand rpl_isnand
687 _GL_EXTERN_C int isnand (double x);
692 /* Test for NaN for 'long double' numbers. */
694 /* The original <math.h> included above provides a declaration of isnan
695 macro or (older) isnanl function. */
697 /* GCC 4.0 and newer provides three built-ins for isnan. */
699 # define isnanl(x) __builtin_isnanl ((long double)(x))
702 # define isnanl(x) isnan ((long double)(x))
705 /* Test whether X is a NaN. */
707 # define isnanl rpl_isnanl
708 _GL_EXTERN_C int isnanl (long double x);
712 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
715 /* We can't just use the isnanf macro (e.g.) as exposed by
716 isnanf.h (e.g.) here, because those may end up being macros
717 that recursively expand back to isnan. So use the gnulib
718 replacements for them directly. */
719 # if @HAVE_ISNANF@ && __GNUC__ >= 4
720 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
722 _GL_EXTERN_C int rpl_isnanf (float x);
723 # define gl_isnan_f(x) rpl_isnanf (x)
725 # if @HAVE_ISNAND@ && __GNUC__ >= 4
726 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
728 _GL_EXTERN_C int rpl_isnand (double x);
729 # define gl_isnan_d(x) rpl_isnand (x)
731 # if @HAVE_ISNANL@ && __GNUC__ >= 4
732 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
734 _GL_EXTERN_C int rpl_isnanl (long double x);
735 # define gl_isnan_l(x) rpl_isnanl (x)
739 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
740 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
745 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
746 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
747 __builtin_isnanf ((float)(x)))
749 /* Ensure isnan is a macro. */
753 #elif defined GNULIB_POSIXCHECK
755 _GL_WARN_REAL_FLOATING_DECL (isnan);
757 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
763 # if @REPLACE_SIGNBIT_USING_GCC@
765 /* GCC 4.0 and newer provides three built-ins for signbit. */
766 # define signbit(x) \
767 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
768 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
769 __builtin_signbitf (x))
771 # if @REPLACE_SIGNBIT@
773 _GL_EXTERN_C int gl_signbitf (float arg);
774 _GL_EXTERN_C int gl_signbitd (double arg);
775 _GL_EXTERN_C int gl_signbitl (long double arg);
776 # if __GNUC__ >= 2 && !__STRICT_ANSI__
777 # define _GL_NUM_UINT_WORDS(type) \
778 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
779 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
780 # define gl_signbitf_OPTIMIZED_MACRO
781 # define gl_signbitf(arg) \
782 ({ union { float _value; \
783 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
786 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
789 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
790 # define gl_signbitd_OPTIMIZED_MACRO
791 # define gl_signbitd(arg) \
792 ({ union { double _value; \
793 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
796 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
799 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
800 # define gl_signbitl_OPTIMIZED_MACRO
801 # define gl_signbitl(arg) \
802 ({ union { long double _value; \
803 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
806 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
810 # define signbit(x) \
811 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
812 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
815 #elif defined GNULIB_POSIXCHECK
817 _GL_WARN_REAL_FLOATING_DECL (signbit);
819 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
824 #endif /* _@GUARD_PREFIX@_MATH_H */
825 #endif /* _@GUARD_PREFIX@_MATH_H */