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)
112 # if !@HAVE_ACOSL@ || !@HAVE_DECL_ACOSL@
113 _GL_FUNCDECL_SYS (acosl, long double, (long double x));
115 _GL_CXXALIAS_SYS (acosl, long double, (long double x));
116 _GL_CXXALIASWARN (acosl);
117 #elif defined GNULIB_POSIXCHECK
119 # if HAVE_RAW_DECL_ACOSL
120 _GL_WARN_ON_USE (acosl, "acosl is unportable - "
121 "use gnulib module mathl for portability");
127 # if !@HAVE_ASINL@ || !@HAVE_DECL_ASINL@
128 _GL_FUNCDECL_SYS (asinl, long double, (long double x));
130 _GL_CXXALIAS_SYS (asinl, long double, (long double x));
131 _GL_CXXALIASWARN (asinl);
132 #elif defined GNULIB_POSIXCHECK
134 # if HAVE_RAW_DECL_ASINL
135 _GL_WARN_ON_USE (asinl, "asinl is unportable - "
136 "use gnulib module mathl for portability");
142 # if !@HAVE_ATANL@ || !@HAVE_DECL_ATANL@
143 _GL_FUNCDECL_SYS (atanl, long double, (long double x));
145 _GL_CXXALIAS_SYS (atanl, long double, (long double x));
146 _GL_CXXALIASWARN (atanl);
147 #elif defined GNULIB_POSIXCHECK
149 # if HAVE_RAW_DECL_ATANL
150 _GL_WARN_ON_USE (atanl, "atanl is unportable - "
151 "use gnulib module mathl for portability");
158 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
160 # define ceilf rpl_ceilf
162 _GL_FUNCDECL_RPL (ceilf, float, (float x));
163 _GL_CXXALIAS_RPL (ceilf, float, (float x));
165 # if !@HAVE_DECL_CEILF@
166 _GL_FUNCDECL_SYS (ceilf, float, (float x));
168 _GL_CXXALIAS_SYS (ceilf, float, (float x));
170 _GL_CXXALIASWARN (ceilf);
171 #elif defined GNULIB_POSIXCHECK
173 # if HAVE_RAW_DECL_CEILF
174 _GL_WARN_ON_USE (ceilf, "ceilf is unportable - "
175 "use gnulib module ceilf for portability");
181 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
182 # define ceil rpl_ceil
184 _GL_FUNCDECL_RPL (ceil, double, (double x));
185 _GL_CXXALIAS_RPL (ceil, double, (double x));
187 _GL_CXXALIAS_SYS (ceil, double, (double x));
189 _GL_CXXALIASWARN (ceil);
194 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
196 # define ceill rpl_ceill
198 _GL_FUNCDECL_RPL (ceill, long double, (long double x));
199 _GL_CXXALIAS_RPL (ceill, long double, (long double x));
201 # if !@HAVE_DECL_CEILL@
202 _GL_FUNCDECL_SYS (ceill, long double, (long double x));
204 _GL_CXXALIAS_SYS (ceill, long double, (long double x));
206 _GL_CXXALIASWARN (ceill);
207 #elif defined GNULIB_POSIXCHECK
209 # if HAVE_RAW_DECL_CEILL
210 _GL_WARN_ON_USE (ceill, "ceill is unportable - "
211 "use gnulib module ceill for portability");
217 # if !@HAVE_COSL@ || !@HAVE_DECL_COSL@
218 _GL_FUNCDECL_SYS (cosl, long double, (long double x));
220 _GL_CXXALIAS_SYS (cosl, long double, (long double x));
221 _GL_CXXALIASWARN (cosl);
222 #elif defined GNULIB_POSIXCHECK
224 # if HAVE_RAW_DECL_COSL
225 _GL_WARN_ON_USE (cosl, "cosl is unportable - "
226 "use gnulib module mathl for portability");
232 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
233 _GL_FUNCDECL_SYS (expl, long double, (long double x));
235 _GL_CXXALIAS_SYS (expl, long double, (long double x));
236 _GL_CXXALIASWARN (expl);
237 #elif defined GNULIB_POSIXCHECK
239 # if HAVE_RAW_DECL_EXPL
240 _GL_WARN_ON_USE (expl, "expl is unportable - "
241 "use gnulib module mathl for portability");
249 _GL_FUNCDECL_SYS (fabsf, float, (float x));
251 _GL_CXXALIAS_SYS (fabsf, float, (float x));
252 _GL_CXXALIASWARN (fabsf);
253 #elif defined GNULIB_POSIXCHECK
255 # if HAVE_RAW_DECL_FABSF
256 _GL_WARN_ON_USE (fabsf, "fabsf is unportable - "
257 "use gnulib module fabsf for portability");
263 # if @REPLACE_FLOORF@
264 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
266 # define floorf rpl_floorf
268 _GL_FUNCDECL_RPL (floorf, float, (float x));
269 _GL_CXXALIAS_RPL (floorf, float, (float x));
271 # if !@HAVE_DECL_FLOORF@
272 _GL_FUNCDECL_SYS (floorf, float, (float x));
274 _GL_CXXALIAS_SYS (floorf, float, (float x));
276 _GL_CXXALIASWARN (floorf);
277 #elif defined GNULIB_POSIXCHECK
279 # if HAVE_RAW_DECL_FLOORF
280 _GL_WARN_ON_USE (floorf, "floorf is unportable - "
281 "use gnulib module floorf for portability");
287 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
288 # define floor rpl_floor
290 _GL_FUNCDECL_RPL (floor, double, (double x));
291 _GL_CXXALIAS_RPL (floor, double, (double x));
293 _GL_CXXALIAS_SYS (floor, double, (double x));
295 _GL_CXXALIASWARN (floor);
299 # if @REPLACE_FLOORL@
300 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
302 # define floorl rpl_floorl
304 _GL_FUNCDECL_RPL (floorl, long double, (long double x));
305 _GL_CXXALIAS_RPL (floorl, long double, (long double x));
307 # if !@HAVE_DECL_FLOORL@
308 _GL_FUNCDECL_SYS (floorl, long double, (long double x));
310 _GL_CXXALIAS_SYS (floorl, long double, (long double x));
312 _GL_CXXALIASWARN (floorl);
313 #elif defined GNULIB_POSIXCHECK
315 # if HAVE_RAW_DECL_FLOORL
316 _GL_WARN_ON_USE (floorl, "floorl is unportable - "
317 "use gnulib module floorl for portability");
325 _GL_FUNCDECL_SYS (fmodf, float, (float x, float y));
327 _GL_CXXALIAS_SYS (fmodf, float, (float x, float y));
328 _GL_CXXALIASWARN (fmodf);
329 #elif defined GNULIB_POSIXCHECK
331 # if HAVE_RAW_DECL_FMODF
332 _GL_WARN_ON_USE (fmodf, "fmodf is unportable - "
333 "use gnulib module fmodf for portability");
341 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
342 If x is zero: mantissa = x, exp = 0.
343 If x is infinite or NaN: mantissa = x, exp unspecified.
344 Store exp in *EXPPTR and return mantissa. */
346 # if @REPLACE_FREXPF@
347 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
349 # define frexpf rpl_frexpf
351 _GL_FUNCDECL_RPL (frexpf, float, (float x, int *expptr) _GL_ARG_NONNULL ((2)));
352 _GL_CXXALIAS_RPL (frexpf, float, (float x, int *expptr));
356 _GL_FUNCDECL_SYS (frexpf, float, (float x, int *expptr) _GL_ARG_NONNULL ((2)));
358 _GL_CXXALIAS_SYS (frexpf, float, (float x, int *expptr));
360 _GL_CXXALIASWARN (frexpf);
361 #elif defined GNULIB_POSIXCHECK
363 # if HAVE_RAW_DECL_FREXPF
364 _GL_WARN_ON_USE (frexpf, "frexpf is unportable - "
365 "use gnulib module frexpf for portability");
372 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
373 If x is zero: mantissa = x, exp = 0.
374 If x is infinite or NaN: mantissa = x, exp unspecified.
375 Store exp in *EXPPTR and return mantissa. */
378 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
379 # define frexp rpl_frexp
381 _GL_FUNCDECL_RPL (frexp, double, (double x, int *expptr) _GL_ARG_NONNULL ((2)));
382 _GL_CXXALIAS_RPL (frexp, double, (double x, int *expptr));
384 _GL_CXXALIAS_SYS (frexp, double, (double x, int *expptr));
386 _GL_CXXALIASWARN (frexp);
387 #elif defined GNULIB_POSIXCHECK
389 /* Assume frexp is always declared. */
390 _GL_WARN_ON_USE (frexp, "frexp is unportable - "
391 "use gnulib module frexp for portability");
397 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
398 If x is zero: mantissa = x, exp = 0.
399 If x is infinite or NaN: mantissa = x, exp unspecified.
400 Store exp in *EXPPTR and return mantissa. */
401 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
402 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
404 # define frexpl rpl_frexpl
406 _GL_FUNCDECL_RPL (frexpl, long double,
407 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
408 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
410 # if !@HAVE_DECL_FREXPL@
411 _GL_FUNCDECL_SYS (frexpl, long double,
412 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
415 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
418 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
419 _GL_CXXALIASWARN (frexpl);
421 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
423 # if HAVE_RAW_DECL_FREXPL
424 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
425 "use gnulib module frexpl for portability");
430 /* Return x * 2^exp. */
434 _GL_FUNCDECL_SYS (ldexpf, float, (float x, int exp));
436 _GL_CXXALIAS_SYS (ldexpf, float, (float x, int exp));
437 _GL_CXXALIASWARN (ldexpf);
438 #elif defined GNULIB_POSIXCHECK
440 # if HAVE_RAW_DECL_LDEXPF
441 _GL_WARN_ON_USE (ldexpf, "ldexpf is unportable - "
442 "use gnulib module ldexpf for portability");
446 /* Return x * 2^exp. */
447 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
448 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
450 # define ldexpl rpl_ldexpl
452 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
453 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
455 # if !@HAVE_DECL_LDEXPL@
456 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
459 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
463 _GL_CXXALIASWARN (ldexpl);
465 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
467 # if HAVE_RAW_DECL_LDEXPL
468 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
469 "use gnulib module ldexpl for portability");
475 # if !@HAVE_DECL_LOGB@
476 _GL_EXTERN_C double logb (double x);
478 #elif defined GNULIB_POSIXCHECK
480 # if HAVE_RAW_DECL_LOGB
481 _GL_WARN_ON_USE (logb, "logb is unportable - "
482 "use gnulib module logb for portability");
488 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
489 _GL_FUNCDECL_SYS (logl, long double, (long double x));
491 _GL_CXXALIAS_SYS (logl, long double, (long double x));
492 _GL_CXXALIASWARN (logl);
493 #elif defined GNULIB_POSIXCHECK
495 # if HAVE_RAW_DECL_LOGL
496 _GL_WARN_ON_USE (logl, "logl is unportable - "
497 "use gnulib module mathl for portability");
505 _GL_FUNCDECL_SYS (modff, float, (float x, float *iptr) _GL_ARG_NONNULL ((2)));
507 _GL_CXXALIAS_SYS (modff, float, (float x, float *iptr));
508 _GL_CXXALIASWARN (modff);
509 #elif defined GNULIB_POSIXCHECK
511 # if HAVE_RAW_DECL_MODFF
512 _GL_WARN_ON_USE (modff, "modff is unportable - "
513 "use gnulib module modff for portability");
519 # if @REPLACE_ROUNDF@
520 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
522 # define roundf rpl_roundf
524 _GL_FUNCDECL_RPL (roundf, float, (float x));
525 _GL_CXXALIAS_RPL (roundf, float, (float x));
527 # if !@HAVE_DECL_ROUNDF@
528 _GL_FUNCDECL_SYS (roundf, float, (float x));
530 _GL_CXXALIAS_SYS (roundf, float, (float x));
532 _GL_CXXALIASWARN (roundf);
533 #elif defined GNULIB_POSIXCHECK
535 # if HAVE_RAW_DECL_ROUNDF
536 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
537 "use gnulib module roundf for portability");
543 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
545 # define round rpl_round
547 _GL_FUNCDECL_RPL (round, double, (double x));
548 _GL_CXXALIAS_RPL (round, double, (double x));
550 # if !@HAVE_DECL_ROUND@
551 _GL_FUNCDECL_SYS (round, double, (double x));
553 _GL_CXXALIAS_SYS (round, double, (double x));
555 _GL_CXXALIASWARN (round);
556 #elif defined GNULIB_POSIXCHECK
558 # if HAVE_RAW_DECL_ROUND
559 _GL_WARN_ON_USE (round, "round is unportable - "
560 "use gnulib module round for portability");
565 # if @REPLACE_ROUNDL@
566 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
568 # define roundl rpl_roundl
570 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
571 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
573 # if !@HAVE_DECL_ROUNDL@
574 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
576 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
578 _GL_CXXALIASWARN (roundl);
579 #elif defined GNULIB_POSIXCHECK
581 # if HAVE_RAW_DECL_ROUNDL
582 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
583 "use gnulib module roundl for portability");
589 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
590 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
592 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
593 _GL_CXXALIASWARN (sinl);
594 #elif defined GNULIB_POSIXCHECK
596 # if HAVE_RAW_DECL_SINL
597 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
598 "use gnulib module mathl for portability");
604 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
605 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
607 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
608 _GL_CXXALIASWARN (sqrtl);
609 #elif defined GNULIB_POSIXCHECK
611 # if HAVE_RAW_DECL_SQRTL
612 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
613 "use gnulib module mathl for portability");
619 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
620 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
622 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
623 _GL_CXXALIASWARN (tanl);
624 #elif defined GNULIB_POSIXCHECK
626 # if HAVE_RAW_DECL_TANL
627 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
628 "use gnulib module mathl for portability");
634 # if @REPLACE_TRUNCF@
635 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
636 # define truncf rpl_truncf
638 _GL_FUNCDECL_RPL (truncf, float, (float x));
639 _GL_CXXALIAS_RPL (truncf, float, (float x));
641 # if !@HAVE_DECL_TRUNCF@
642 _GL_FUNCDECL_SYS (truncf, float, (float x));
644 _GL_CXXALIAS_SYS (truncf, float, (float x));
646 _GL_CXXALIASWARN (truncf);
647 #elif defined GNULIB_POSIXCHECK
649 # if HAVE_RAW_DECL_TRUNCF
650 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
651 "use gnulib module truncf for portability");
657 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
658 # define trunc rpl_trunc
660 _GL_FUNCDECL_RPL (trunc, double, (double x));
661 _GL_CXXALIAS_RPL (trunc, double, (double x));
663 # if !@HAVE_DECL_TRUNC@
664 _GL_FUNCDECL_SYS (trunc, double, (double x));
666 _GL_CXXALIAS_SYS (trunc, double, (double x));
668 _GL_CXXALIASWARN (trunc);
669 #elif defined GNULIB_POSIXCHECK
671 # if HAVE_RAW_DECL_TRUNC
672 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
673 "use gnulib module trunc for portability");
678 # if @REPLACE_TRUNCL@
679 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
681 # define truncl rpl_truncl
683 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
684 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
686 # if !@HAVE_DECL_TRUNCL@
687 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
689 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
691 _GL_CXXALIASWARN (truncl);
692 #elif defined GNULIB_POSIXCHECK
694 # if HAVE_RAW_DECL_TRUNCL
695 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
696 "use gnulib module truncl for portability");
701 /* Definitions of function-like macros come here, after the function
705 #if @GNULIB_ISFINITE@
706 # if @REPLACE_ISFINITE@
707 _GL_EXTERN_C int gl_isfinitef (float x);
708 _GL_EXTERN_C int gl_isfinited (double x);
709 _GL_EXTERN_C int gl_isfinitel (long double x);
711 # define isfinite(x) \
712 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
713 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
716 #elif defined GNULIB_POSIXCHECK
717 # if defined isfinite
718 _GL_WARN_REAL_FLOATING_DECL (isfinite);
720 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
727 _GL_EXTERN_C int gl_isinff (float x);
728 _GL_EXTERN_C int gl_isinfd (double x);
729 _GL_EXTERN_C int gl_isinfl (long double x);
732 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
733 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
736 #elif defined GNULIB_POSIXCHECK
738 _GL_WARN_REAL_FLOATING_DECL (isinf);
740 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
746 /* Test for NaN for 'float' numbers. */
748 /* The original <math.h> included above provides a declaration of isnan macro
749 or (older) isnanf function. */
751 /* GCC 4.0 and newer provides three built-ins for isnan. */
753 # define isnanf(x) __builtin_isnanf ((float)(x))
756 # define isnanf(x) isnan ((float)(x))
759 /* Test whether X is a NaN. */
761 # define isnanf rpl_isnanf
762 _GL_EXTERN_C int isnanf (float x);
767 /* Test for NaN for 'double' numbers.
768 This function is a gnulib extension, unlike isnan() which applied only
769 to 'double' numbers earlier but now is a type-generic macro. */
771 /* The original <math.h> included above provides a declaration of isnan
774 /* GCC 4.0 and newer provides three built-ins for isnan. */
776 # define isnand(x) __builtin_isnan ((double)(x))
779 # define isnand(x) isnan ((double)(x))
782 /* Test whether X is a NaN. */
784 # define isnand rpl_isnand
785 _GL_EXTERN_C int isnand (double x);
790 /* Test for NaN for 'long double' numbers. */
792 /* The original <math.h> included above provides a declaration of isnan
793 macro or (older) isnanl function. */
795 /* GCC 4.0 and newer provides three built-ins for isnan. */
797 # define isnanl(x) __builtin_isnanl ((long double)(x))
800 # define isnanl(x) isnan ((long double)(x))
803 /* Test whether X is a NaN. */
805 # define isnanl rpl_isnanl
806 _GL_EXTERN_C int isnanl (long double x);
810 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
813 /* We can't just use the isnanf macro (e.g.) as exposed by
814 isnanf.h (e.g.) here, because those may end up being macros
815 that recursively expand back to isnan. So use the gnulib
816 replacements for them directly. */
817 # if @HAVE_ISNANF@ && __GNUC__ >= 4
818 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
820 _GL_EXTERN_C int rpl_isnanf (float x);
821 # define gl_isnan_f(x) rpl_isnanf (x)
823 # if @HAVE_ISNAND@ && __GNUC__ >= 4
824 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
826 _GL_EXTERN_C int rpl_isnand (double x);
827 # define gl_isnan_d(x) rpl_isnand (x)
829 # if @HAVE_ISNANL@ && __GNUC__ >= 4
830 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
832 _GL_EXTERN_C int rpl_isnanl (long double x);
833 # define gl_isnan_l(x) rpl_isnanl (x)
837 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
838 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
843 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
844 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
845 __builtin_isnanf ((float)(x)))
847 /* Ensure isnan is a macro. */
851 #elif defined GNULIB_POSIXCHECK
853 _GL_WARN_REAL_FLOATING_DECL (isnan);
855 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
861 # if @REPLACE_SIGNBIT_USING_GCC@
863 /* GCC 4.0 and newer provides three built-ins for signbit. */
864 # define signbit(x) \
865 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
866 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
867 __builtin_signbitf (x))
869 # if @REPLACE_SIGNBIT@
871 _GL_EXTERN_C int gl_signbitf (float arg);
872 _GL_EXTERN_C int gl_signbitd (double arg);
873 _GL_EXTERN_C int gl_signbitl (long double arg);
874 # if __GNUC__ >= 2 && !__STRICT_ANSI__
875 # define _GL_NUM_UINT_WORDS(type) \
876 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
877 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
878 # define gl_signbitf_OPTIMIZED_MACRO
879 # define gl_signbitf(arg) \
880 ({ union { float _value; \
881 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
884 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
887 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
888 # define gl_signbitd_OPTIMIZED_MACRO
889 # define gl_signbitd(arg) \
890 ({ union { double _value; \
891 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
894 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
897 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
898 # define gl_signbitl_OPTIMIZED_MACRO
899 # define gl_signbitl(arg) \
900 ({ union { long double _value; \
901 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
904 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
908 # define signbit(x) \
909 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
910 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
913 #elif defined GNULIB_POSIXCHECK
915 _GL_WARN_REAL_FLOATING_DECL (signbit);
917 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
922 #endif /* _@GUARD_PREFIX@_MATH_H */
923 #endif /* _@GUARD_PREFIX@_MATH_H */