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");
234 _GL_FUNCDECL_SYS (expf, float, (float x));
236 _GL_CXXALIAS_SYS (expf, float, (float x));
237 _GL_CXXALIASWARN (expf);
238 #elif defined GNULIB_POSIXCHECK
240 # if HAVE_RAW_DECL_EXPF
241 _GL_WARN_ON_USE (expf, "expf is unportable - "
242 "use gnulib module expf for portability");
247 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
248 _GL_FUNCDECL_SYS (expl, long double, (long double x));
250 _GL_CXXALIAS_SYS (expl, long double, (long double x));
251 _GL_CXXALIASWARN (expl);
252 #elif defined GNULIB_POSIXCHECK
254 # if HAVE_RAW_DECL_EXPL
255 _GL_WARN_ON_USE (expl, "expl is unportable - "
256 "use gnulib module mathl for portability");
264 _GL_FUNCDECL_SYS (fabsf, float, (float x));
266 _GL_CXXALIAS_SYS (fabsf, float, (float x));
267 _GL_CXXALIASWARN (fabsf);
268 #elif defined GNULIB_POSIXCHECK
270 # if HAVE_RAW_DECL_FABSF
271 _GL_WARN_ON_USE (fabsf, "fabsf is unportable - "
272 "use gnulib module fabsf for portability");
278 # if @REPLACE_FLOORF@
279 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
281 # define floorf rpl_floorf
283 _GL_FUNCDECL_RPL (floorf, float, (float x));
284 _GL_CXXALIAS_RPL (floorf, float, (float x));
286 # if !@HAVE_DECL_FLOORF@
287 _GL_FUNCDECL_SYS (floorf, float, (float x));
289 _GL_CXXALIAS_SYS (floorf, float, (float x));
291 _GL_CXXALIASWARN (floorf);
292 #elif defined GNULIB_POSIXCHECK
294 # if HAVE_RAW_DECL_FLOORF
295 _GL_WARN_ON_USE (floorf, "floorf is unportable - "
296 "use gnulib module floorf for portability");
302 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
303 # define floor rpl_floor
305 _GL_FUNCDECL_RPL (floor, double, (double x));
306 _GL_CXXALIAS_RPL (floor, double, (double x));
308 _GL_CXXALIAS_SYS (floor, double, (double x));
310 _GL_CXXALIASWARN (floor);
314 # if @REPLACE_FLOORL@
315 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
317 # define floorl rpl_floorl
319 _GL_FUNCDECL_RPL (floorl, long double, (long double x));
320 _GL_CXXALIAS_RPL (floorl, long double, (long double x));
322 # if !@HAVE_DECL_FLOORL@
323 _GL_FUNCDECL_SYS (floorl, long double, (long double x));
325 _GL_CXXALIAS_SYS (floorl, long double, (long double x));
327 _GL_CXXALIASWARN (floorl);
328 #elif defined GNULIB_POSIXCHECK
330 # if HAVE_RAW_DECL_FLOORL
331 _GL_WARN_ON_USE (floorl, "floorl is unportable - "
332 "use gnulib module floorl for portability");
340 _GL_FUNCDECL_SYS (fmodf, float, (float x, float y));
342 _GL_CXXALIAS_SYS (fmodf, float, (float x, float y));
343 _GL_CXXALIASWARN (fmodf);
344 #elif defined GNULIB_POSIXCHECK
346 # if HAVE_RAW_DECL_FMODF
347 _GL_WARN_ON_USE (fmodf, "fmodf is unportable - "
348 "use gnulib module fmodf for portability");
356 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
357 If x is zero: mantissa = x, exp = 0.
358 If x is infinite or NaN: mantissa = x, exp unspecified.
359 Store exp in *EXPPTR and return mantissa. */
361 # if @REPLACE_FREXPF@
362 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
364 # define frexpf rpl_frexpf
366 _GL_FUNCDECL_RPL (frexpf, float, (float x, int *expptr) _GL_ARG_NONNULL ((2)));
367 _GL_CXXALIAS_RPL (frexpf, float, (float x, int *expptr));
371 _GL_FUNCDECL_SYS (frexpf, float, (float x, int *expptr) _GL_ARG_NONNULL ((2)));
373 _GL_CXXALIAS_SYS (frexpf, float, (float x, int *expptr));
375 _GL_CXXALIASWARN (frexpf);
376 #elif defined GNULIB_POSIXCHECK
378 # if HAVE_RAW_DECL_FREXPF
379 _GL_WARN_ON_USE (frexpf, "frexpf is unportable - "
380 "use gnulib module frexpf for portability");
387 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
388 If x is zero: mantissa = x, exp = 0.
389 If x is infinite or NaN: mantissa = x, exp unspecified.
390 Store exp in *EXPPTR and return mantissa. */
393 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
394 # define frexp rpl_frexp
396 _GL_FUNCDECL_RPL (frexp, double, (double x, int *expptr) _GL_ARG_NONNULL ((2)));
397 _GL_CXXALIAS_RPL (frexp, double, (double x, int *expptr));
399 _GL_CXXALIAS_SYS (frexp, double, (double x, int *expptr));
401 _GL_CXXALIASWARN (frexp);
402 #elif defined GNULIB_POSIXCHECK
404 /* Assume frexp is always declared. */
405 _GL_WARN_ON_USE (frexp, "frexp is unportable - "
406 "use gnulib module frexp for portability");
412 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
413 If x is zero: mantissa = x, exp = 0.
414 If x is infinite or NaN: mantissa = x, exp unspecified.
415 Store exp in *EXPPTR and return mantissa. */
416 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
417 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
419 # define frexpl rpl_frexpl
421 _GL_FUNCDECL_RPL (frexpl, long double,
422 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
423 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
425 # if !@HAVE_DECL_FREXPL@
426 _GL_FUNCDECL_SYS (frexpl, long double,
427 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
430 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
433 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
434 _GL_CXXALIASWARN (frexpl);
436 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
438 # if HAVE_RAW_DECL_FREXPL
439 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
440 "use gnulib module frexpl for portability");
445 /* Return x * 2^exp. */
449 _GL_FUNCDECL_SYS (ldexpf, float, (float x, int exp));
451 _GL_CXXALIAS_SYS (ldexpf, float, (float x, int exp));
452 _GL_CXXALIASWARN (ldexpf);
453 #elif defined GNULIB_POSIXCHECK
455 # if HAVE_RAW_DECL_LDEXPF
456 _GL_WARN_ON_USE (ldexpf, "ldexpf is unportable - "
457 "use gnulib module ldexpf for portability");
461 /* Return x * 2^exp. */
462 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
463 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
465 # define ldexpl rpl_ldexpl
467 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
468 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
470 # if !@HAVE_DECL_LDEXPL@
471 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
474 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
478 _GL_CXXALIASWARN (ldexpl);
480 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
482 # if HAVE_RAW_DECL_LDEXPL
483 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
484 "use gnulib module ldexpl for portability");
490 # if !@HAVE_DECL_LOGB@
491 _GL_EXTERN_C double logb (double x);
493 #elif defined GNULIB_POSIXCHECK
495 # if HAVE_RAW_DECL_LOGB
496 _GL_WARN_ON_USE (logb, "logb is unportable - "
497 "use gnulib module logb for portability");
503 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
504 _GL_FUNCDECL_SYS (logl, long double, (long double x));
506 _GL_CXXALIAS_SYS (logl, long double, (long double x));
507 _GL_CXXALIASWARN (logl);
508 #elif defined GNULIB_POSIXCHECK
510 # if HAVE_RAW_DECL_LOGL
511 _GL_WARN_ON_USE (logl, "logl is unportable - "
512 "use gnulib module mathl for portability");
520 _GL_FUNCDECL_SYS (modff, float, (float x, float *iptr) _GL_ARG_NONNULL ((2)));
522 _GL_CXXALIAS_SYS (modff, float, (float x, float *iptr));
523 _GL_CXXALIASWARN (modff);
524 #elif defined GNULIB_POSIXCHECK
526 # if HAVE_RAW_DECL_MODFF
527 _GL_WARN_ON_USE (modff, "modff is unportable - "
528 "use gnulib module modff for portability");
534 # if @REPLACE_ROUNDF@
535 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
537 # define roundf rpl_roundf
539 _GL_FUNCDECL_RPL (roundf, float, (float x));
540 _GL_CXXALIAS_RPL (roundf, float, (float x));
542 # if !@HAVE_DECL_ROUNDF@
543 _GL_FUNCDECL_SYS (roundf, float, (float x));
545 _GL_CXXALIAS_SYS (roundf, float, (float x));
547 _GL_CXXALIASWARN (roundf);
548 #elif defined GNULIB_POSIXCHECK
550 # if HAVE_RAW_DECL_ROUNDF
551 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
552 "use gnulib module roundf for portability");
558 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
560 # define round rpl_round
562 _GL_FUNCDECL_RPL (round, double, (double x));
563 _GL_CXXALIAS_RPL (round, double, (double x));
565 # if !@HAVE_DECL_ROUND@
566 _GL_FUNCDECL_SYS (round, double, (double x));
568 _GL_CXXALIAS_SYS (round, double, (double x));
570 _GL_CXXALIASWARN (round);
571 #elif defined GNULIB_POSIXCHECK
573 # if HAVE_RAW_DECL_ROUND
574 _GL_WARN_ON_USE (round, "round is unportable - "
575 "use gnulib module round for portability");
580 # if @REPLACE_ROUNDL@
581 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
583 # define roundl rpl_roundl
585 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
586 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
588 # if !@HAVE_DECL_ROUNDL@
589 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
591 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
593 _GL_CXXALIASWARN (roundl);
594 #elif defined GNULIB_POSIXCHECK
596 # if HAVE_RAW_DECL_ROUNDL
597 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
598 "use gnulib module roundl for portability");
604 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
605 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
607 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
608 _GL_CXXALIASWARN (sinl);
609 #elif defined GNULIB_POSIXCHECK
611 # if HAVE_RAW_DECL_SINL
612 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
613 "use gnulib module mathl for portability");
621 _GL_FUNCDECL_SYS (sqrtf, float, (float x));
623 _GL_CXXALIAS_SYS (sqrtf, float, (float x));
624 _GL_CXXALIASWARN (sqrtf);
625 #elif defined GNULIB_POSIXCHECK
627 # if HAVE_RAW_DECL_SQRTF
628 _GL_WARN_ON_USE (sqrtf, "sqrtf is unportable - "
629 "use gnulib module sqrtf for portability");
634 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
635 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
637 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
638 _GL_CXXALIASWARN (sqrtl);
639 #elif defined GNULIB_POSIXCHECK
641 # if HAVE_RAW_DECL_SQRTL
642 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
643 "use gnulib module mathl for portability");
649 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
650 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
652 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
653 _GL_CXXALIASWARN (tanl);
654 #elif defined GNULIB_POSIXCHECK
656 # if HAVE_RAW_DECL_TANL
657 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
658 "use gnulib module mathl for portability");
664 # if @REPLACE_TRUNCF@
665 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
666 # define truncf rpl_truncf
668 _GL_FUNCDECL_RPL (truncf, float, (float x));
669 _GL_CXXALIAS_RPL (truncf, float, (float x));
671 # if !@HAVE_DECL_TRUNCF@
672 _GL_FUNCDECL_SYS (truncf, float, (float x));
674 _GL_CXXALIAS_SYS (truncf, float, (float x));
676 _GL_CXXALIASWARN (truncf);
677 #elif defined GNULIB_POSIXCHECK
679 # if HAVE_RAW_DECL_TRUNCF
680 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
681 "use gnulib module truncf for portability");
687 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
688 # define trunc rpl_trunc
690 _GL_FUNCDECL_RPL (trunc, double, (double x));
691 _GL_CXXALIAS_RPL (trunc, double, (double x));
693 # if !@HAVE_DECL_TRUNC@
694 _GL_FUNCDECL_SYS (trunc, double, (double x));
696 _GL_CXXALIAS_SYS (trunc, double, (double x));
698 _GL_CXXALIASWARN (trunc);
699 #elif defined GNULIB_POSIXCHECK
701 # if HAVE_RAW_DECL_TRUNC
702 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
703 "use gnulib module trunc for portability");
708 # if @REPLACE_TRUNCL@
709 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
711 # define truncl rpl_truncl
713 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
714 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
716 # if !@HAVE_DECL_TRUNCL@
717 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
719 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
721 _GL_CXXALIASWARN (truncl);
722 #elif defined GNULIB_POSIXCHECK
724 # if HAVE_RAW_DECL_TRUNCL
725 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
726 "use gnulib module truncl for portability");
731 /* Definitions of function-like macros come here, after the function
735 #if @GNULIB_ISFINITE@
736 # if @REPLACE_ISFINITE@
737 _GL_EXTERN_C int gl_isfinitef (float x);
738 _GL_EXTERN_C int gl_isfinited (double x);
739 _GL_EXTERN_C int gl_isfinitel (long double x);
741 # define isfinite(x) \
742 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
743 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
746 #elif defined GNULIB_POSIXCHECK
747 # if defined isfinite
748 _GL_WARN_REAL_FLOATING_DECL (isfinite);
750 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
757 _GL_EXTERN_C int gl_isinff (float x);
758 _GL_EXTERN_C int gl_isinfd (double x);
759 _GL_EXTERN_C int gl_isinfl (long double x);
762 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
763 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
766 #elif defined GNULIB_POSIXCHECK
768 _GL_WARN_REAL_FLOATING_DECL (isinf);
770 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
776 /* Test for NaN for 'float' numbers. */
778 /* The original <math.h> included above provides a declaration of isnan macro
779 or (older) isnanf function. */
781 /* GCC 4.0 and newer provides three built-ins for isnan. */
783 # define isnanf(x) __builtin_isnanf ((float)(x))
786 # define isnanf(x) isnan ((float)(x))
789 /* Test whether X is a NaN. */
791 # define isnanf rpl_isnanf
792 _GL_EXTERN_C int isnanf (float x);
797 /* Test for NaN for 'double' numbers.
798 This function is a gnulib extension, unlike isnan() which applied only
799 to 'double' numbers earlier but now is a type-generic macro. */
801 /* The original <math.h> included above provides a declaration of isnan
804 /* GCC 4.0 and newer provides three built-ins for isnan. */
806 # define isnand(x) __builtin_isnan ((double)(x))
809 # define isnand(x) isnan ((double)(x))
812 /* Test whether X is a NaN. */
814 # define isnand rpl_isnand
815 _GL_EXTERN_C int isnand (double x);
820 /* Test for NaN for 'long double' numbers. */
822 /* The original <math.h> included above provides a declaration of isnan
823 macro or (older) isnanl function. */
825 /* GCC 4.0 and newer provides three built-ins for isnan. */
827 # define isnanl(x) __builtin_isnanl ((long double)(x))
830 # define isnanl(x) isnan ((long double)(x))
833 /* Test whether X is a NaN. */
835 # define isnanl rpl_isnanl
836 _GL_EXTERN_C int isnanl (long double x);
840 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
843 /* We can't just use the isnanf macro (e.g.) as exposed by
844 isnanf.h (e.g.) here, because those may end up being macros
845 that recursively expand back to isnan. So use the gnulib
846 replacements for them directly. */
847 # if @HAVE_ISNANF@ && __GNUC__ >= 4
848 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
850 _GL_EXTERN_C int rpl_isnanf (float x);
851 # define gl_isnan_f(x) rpl_isnanf (x)
853 # if @HAVE_ISNAND@ && __GNUC__ >= 4
854 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
856 _GL_EXTERN_C int rpl_isnand (double x);
857 # define gl_isnan_d(x) rpl_isnand (x)
859 # if @HAVE_ISNANL@ && __GNUC__ >= 4
860 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
862 _GL_EXTERN_C int rpl_isnanl (long double x);
863 # define gl_isnan_l(x) rpl_isnanl (x)
867 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
868 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
873 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
874 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
875 __builtin_isnanf ((float)(x)))
877 /* Ensure isnan is a macro. */
881 #elif defined GNULIB_POSIXCHECK
883 _GL_WARN_REAL_FLOATING_DECL (isnan);
885 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
891 # if @REPLACE_SIGNBIT_USING_GCC@
893 /* GCC 4.0 and newer provides three built-ins for signbit. */
894 # define signbit(x) \
895 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
896 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
897 __builtin_signbitf (x))
899 # if @REPLACE_SIGNBIT@
901 _GL_EXTERN_C int gl_signbitf (float arg);
902 _GL_EXTERN_C int gl_signbitd (double arg);
903 _GL_EXTERN_C int gl_signbitl (long double arg);
904 # if __GNUC__ >= 2 && !__STRICT_ANSI__
905 # define _GL_NUM_UINT_WORDS(type) \
906 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
907 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
908 # define gl_signbitf_OPTIMIZED_MACRO
909 # define gl_signbitf(arg) \
910 ({ union { float _value; \
911 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
914 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
917 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
918 # define gl_signbitd_OPTIMIZED_MACRO
919 # define gl_signbitd(arg) \
920 ({ union { double _value; \
921 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
924 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
927 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
928 # define gl_signbitl_OPTIMIZED_MACRO
929 # define gl_signbitl(arg) \
930 ({ union { long double _value; \
931 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
934 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
938 # define signbit(x) \
939 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
940 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
943 #elif defined GNULIB_POSIXCHECK
945 _GL_WARN_REAL_FLOATING_DECL (signbit);
947 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
952 #endif /* _@GUARD_PREFIX@_MATH_H */
953 #endif /* _@GUARD_PREFIX@_MATH_H */