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))
70 /* POSIX allows platforms that don't support NAN. But all major
71 machines in the past 15 years have supported something close to
72 IEEE NaN, so we define this unconditionally. We also must define
73 it on platforms like Solaris 10, where NAN is present but defined
74 as a function pointer rather than a floating point constant. */
75 #if !defined NAN || @REPLACE_NAN@
76 # if !GNULIB_defined_NAN
78 /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler
79 choke on the expression 0.0 / 0.0. */
80 # if defined __DECC || defined _MSC_VER
84 static float zero = 0.0f;
89 # define NAN (0.0f / 0.0f)
91 # define GNULIB_defined_NAN 1
95 /* Solaris 10 defines HUGE_VAL, but as a function pointer rather
96 than a floating point constant. */
97 #if @REPLACE_HUGE_VAL@
99 # define HUGE_VAL (1.0 / 0.0)
106 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
107 If x is zero: mantissa = x, exp = 0.
108 If x is infinite or NaN: mantissa = x, exp unspecified.
109 Store exp in *EXPPTR and return mantissa. */
112 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
113 # define frexp rpl_frexp
115 _GL_FUNCDECL_RPL (frexp, double, (double x, int *expptr) _GL_ARG_NONNULL ((2)));
116 _GL_CXXALIAS_RPL (frexp, double, (double x, int *expptr));
118 _GL_CXXALIAS_SYS (frexp, double, (double x, int *expptr));
120 _GL_CXXALIASWARN (frexp);
121 #elif defined GNULIB_POSIXCHECK
123 /* Assume frexp is always declared. */
124 _GL_WARN_ON_USE (frexp, "frexp is unportable - "
125 "use gnulib module frexp for portability");
130 # if !@HAVE_DECL_LOGB@
131 _GL_EXTERN_C double logb (double x);
133 #elif defined GNULIB_POSIXCHECK
135 # if HAVE_RAW_DECL_LOGB
136 _GL_WARN_ON_USE (logb, "logb is unportable - "
137 "use gnulib module logb for portability");
143 # if !@HAVE_ACOSL@ || !@HAVE_DECL_ACOSL@
144 _GL_FUNCDECL_SYS (acosl, long double, (long double x));
146 _GL_CXXALIAS_SYS (acosl, long double, (long double x));
147 _GL_CXXALIASWARN (acosl);
148 #elif defined GNULIB_POSIXCHECK
150 # if HAVE_RAW_DECL_ACOSL
151 _GL_WARN_ON_USE (acosl, "acosl is unportable - "
152 "use gnulib module mathl for portability");
158 # if !@HAVE_ASINL@ || !@HAVE_DECL_ASINL@
159 _GL_FUNCDECL_SYS (asinl, long double, (long double x));
161 _GL_CXXALIAS_SYS (asinl, long double, (long double x));
162 _GL_CXXALIASWARN (asinl);
163 #elif defined GNULIB_POSIXCHECK
165 # if HAVE_RAW_DECL_ASINL
166 _GL_WARN_ON_USE (asinl, "asinl is unportable - "
167 "use gnulib module mathl for portability");
173 # if !@HAVE_ATANL@ || !@HAVE_DECL_ATANL@
174 _GL_FUNCDECL_SYS (atanl, long double, (long double x));
176 _GL_CXXALIAS_SYS (atanl, long double, (long double x));
177 _GL_CXXALIASWARN (atanl);
178 #elif defined GNULIB_POSIXCHECK
180 # if HAVE_RAW_DECL_ATANL
181 _GL_WARN_ON_USE (atanl, "atanl is unportable - "
182 "use gnulib module mathl for portability");
189 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
191 # define ceilf rpl_ceilf
193 _GL_FUNCDECL_RPL (ceilf, float, (float x));
194 _GL_CXXALIAS_RPL (ceilf, float, (float x));
196 # if !@HAVE_DECL_CEILF@
197 _GL_FUNCDECL_SYS (ceilf, float, (float x));
199 _GL_CXXALIAS_SYS (ceilf, float, (float x));
201 _GL_CXXALIASWARN (ceilf);
202 #elif defined GNULIB_POSIXCHECK
204 # if HAVE_RAW_DECL_CEILF
205 _GL_WARN_ON_USE (ceilf, "ceilf is unportable - "
206 "use gnulib module ceilf for portability");
212 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
213 # define ceil rpl_ceil
215 _GL_FUNCDECL_RPL (ceil, double, (double x));
216 _GL_CXXALIAS_RPL (ceil, double, (double x));
218 _GL_CXXALIAS_SYS (ceil, double, (double x));
220 _GL_CXXALIASWARN (ceil);
225 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
227 # define ceill rpl_ceill
229 _GL_FUNCDECL_RPL (ceill, long double, (long double x));
230 _GL_CXXALIAS_RPL (ceill, long double, (long double x));
232 # if !@HAVE_DECL_CEILL@
233 _GL_FUNCDECL_SYS (ceill, long double, (long double x));
235 _GL_CXXALIAS_SYS (ceill, long double, (long double x));
237 _GL_CXXALIASWARN (ceill);
238 #elif defined GNULIB_POSIXCHECK
240 # if HAVE_RAW_DECL_CEILL
241 _GL_WARN_ON_USE (ceill, "ceill is unportable - "
242 "use gnulib module ceill for portability");
248 # if !@HAVE_COSL@ || !@HAVE_DECL_COSL@
249 _GL_FUNCDECL_SYS (cosl, long double, (long double x));
251 _GL_CXXALIAS_SYS (cosl, long double, (long double x));
252 _GL_CXXALIASWARN (cosl);
253 #elif defined GNULIB_POSIXCHECK
255 # if HAVE_RAW_DECL_COSL
256 _GL_WARN_ON_USE (cosl, "cosl is unportable - "
257 "use gnulib module mathl for portability");
263 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
264 _GL_FUNCDECL_SYS (expl, long double, (long double x));
266 _GL_CXXALIAS_SYS (expl, long double, (long double x));
267 _GL_CXXALIASWARN (expl);
268 #elif defined GNULIB_POSIXCHECK
270 # if HAVE_RAW_DECL_EXPL
271 _GL_WARN_ON_USE (expl, "expl is unportable - "
272 "use gnulib module mathl 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 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
341 If x is zero: mantissa = x, exp = 0.
342 If x is infinite or NaN: mantissa = x, exp unspecified.
343 Store exp in *EXPPTR and return mantissa. */
344 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
345 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
347 # define frexpl rpl_frexpl
349 _GL_FUNCDECL_RPL (frexpl, long double,
350 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
351 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
353 # if !@HAVE_DECL_FREXPL@
354 _GL_FUNCDECL_SYS (frexpl, long double,
355 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
358 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
361 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
362 _GL_CXXALIASWARN (frexpl);
364 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
366 # if HAVE_RAW_DECL_FREXPL
367 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
368 "use gnulib module frexpl for portability");
373 /* Return x * 2^exp. */
374 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
375 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
377 # define ldexpl rpl_ldexpl
379 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
380 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
382 # if !@HAVE_DECL_LDEXPL@
383 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
386 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
390 _GL_CXXALIASWARN (ldexpl);
392 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
394 # if HAVE_RAW_DECL_LDEXPL
395 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
396 "use gnulib module ldexpl for portability");
402 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
403 _GL_FUNCDECL_SYS (logl, long double, (long double x));
405 _GL_CXXALIAS_SYS (logl, long double, (long double x));
406 _GL_CXXALIASWARN (logl);
407 #elif defined GNULIB_POSIXCHECK
409 # if HAVE_RAW_DECL_LOGL
410 _GL_WARN_ON_USE (logl, "logl is unportable - "
411 "use gnulib module mathl for portability");
417 # if @REPLACE_ROUNDF@
418 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
420 # define roundf rpl_roundf
422 _GL_FUNCDECL_RPL (roundf, float, (float x));
423 _GL_CXXALIAS_RPL (roundf, float, (float x));
425 # if !@HAVE_DECL_ROUNDF@
426 _GL_FUNCDECL_SYS (roundf, float, (float x));
428 _GL_CXXALIAS_SYS (roundf, float, (float x));
430 _GL_CXXALIASWARN (roundf);
431 #elif defined GNULIB_POSIXCHECK
433 # if HAVE_RAW_DECL_ROUNDF
434 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
435 "use gnulib module roundf for portability");
441 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
443 # define round rpl_round
445 _GL_FUNCDECL_RPL (round, double, (double x));
446 _GL_CXXALIAS_RPL (round, double, (double x));
448 # if !@HAVE_DECL_ROUND@
449 _GL_FUNCDECL_SYS (round, double, (double x));
451 _GL_CXXALIAS_SYS (round, double, (double x));
453 _GL_CXXALIASWARN (round);
454 #elif defined GNULIB_POSIXCHECK
456 # if HAVE_RAW_DECL_ROUND
457 _GL_WARN_ON_USE (round, "round is unportable - "
458 "use gnulib module round for portability");
463 # if @REPLACE_ROUNDL@
464 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
466 # define roundl rpl_roundl
468 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
469 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
471 # if !@HAVE_DECL_ROUNDL@
472 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
474 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
476 _GL_CXXALIASWARN (roundl);
477 #elif defined GNULIB_POSIXCHECK
479 # if HAVE_RAW_DECL_ROUNDL
480 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
481 "use gnulib module roundl for portability");
487 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
488 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
490 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
491 _GL_CXXALIASWARN (sinl);
492 #elif defined GNULIB_POSIXCHECK
494 # if HAVE_RAW_DECL_SINL
495 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
496 "use gnulib module mathl for portability");
502 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
503 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
505 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
506 _GL_CXXALIASWARN (sqrtl);
507 #elif defined GNULIB_POSIXCHECK
509 # if HAVE_RAW_DECL_SQRTL
510 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
511 "use gnulib module mathl for portability");
517 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
518 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
520 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
521 _GL_CXXALIASWARN (tanl);
522 #elif defined GNULIB_POSIXCHECK
524 # if HAVE_RAW_DECL_TANL
525 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
526 "use gnulib module mathl for portability");
532 # if @REPLACE_TRUNCF@
533 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
534 # define truncf rpl_truncf
536 _GL_FUNCDECL_RPL (truncf, float, (float x));
537 _GL_CXXALIAS_RPL (truncf, float, (float x));
539 # if !@HAVE_DECL_TRUNCF@
540 _GL_FUNCDECL_SYS (truncf, float, (float x));
542 _GL_CXXALIAS_SYS (truncf, float, (float x));
544 _GL_CXXALIASWARN (truncf);
545 #elif defined GNULIB_POSIXCHECK
547 # if HAVE_RAW_DECL_TRUNCF
548 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
549 "use gnulib module truncf for portability");
555 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
556 # define trunc rpl_trunc
558 _GL_FUNCDECL_RPL (trunc, double, (double x));
559 _GL_CXXALIAS_RPL (trunc, double, (double x));
561 # if !@HAVE_DECL_TRUNC@
562 _GL_FUNCDECL_SYS (trunc, double, (double x));
564 _GL_CXXALIAS_SYS (trunc, double, (double x));
566 _GL_CXXALIASWARN (trunc);
567 #elif defined GNULIB_POSIXCHECK
569 # if HAVE_RAW_DECL_TRUNC
570 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
571 "use gnulib module trunc for portability");
576 # if @REPLACE_TRUNCL@
577 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
579 # define truncl rpl_truncl
581 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
582 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
584 # if !@HAVE_DECL_TRUNCL@
585 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
587 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
589 _GL_CXXALIASWARN (truncl);
590 #elif defined GNULIB_POSIXCHECK
592 # if HAVE_RAW_DECL_TRUNCL
593 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
594 "use gnulib module truncl for portability");
599 #if @GNULIB_ISFINITE@
600 # if @REPLACE_ISFINITE@
601 _GL_EXTERN_C int gl_isfinitef (float x);
602 _GL_EXTERN_C int gl_isfinited (double x);
603 _GL_EXTERN_C int gl_isfinitel (long double x);
605 # define isfinite(x) \
606 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
607 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
610 #elif defined GNULIB_POSIXCHECK
611 # if defined isfinite
612 _GL_WARN_REAL_FLOATING_DECL (isfinite);
614 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
621 _GL_EXTERN_C int gl_isinff (float x);
622 _GL_EXTERN_C int gl_isinfd (double x);
623 _GL_EXTERN_C int gl_isinfl (long double x);
626 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
627 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
630 #elif defined GNULIB_POSIXCHECK
632 _GL_WARN_REAL_FLOATING_DECL (isinf);
634 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
640 /* Test for NaN for 'float' numbers. */
642 /* The original <math.h> included above provides a declaration of isnan macro
643 or (older) isnanf function. */
645 /* GCC 4.0 and newer provides three built-ins for isnan. */
647 # define isnanf(x) __builtin_isnanf ((float)(x))
650 # define isnanf(x) isnan ((float)(x))
653 /* Test whether X is a NaN. */
655 # define isnanf rpl_isnanf
656 _GL_EXTERN_C int isnanf (float x);
661 /* Test for NaN for 'double' numbers.
662 This function is a gnulib extension, unlike isnan() which applied only
663 to 'double' numbers earlier but now is a type-generic macro. */
665 /* The original <math.h> included above provides a declaration of isnan
668 /* GCC 4.0 and newer provides three built-ins for isnan. */
670 # define isnand(x) __builtin_isnan ((double)(x))
673 # define isnand(x) isnan ((double)(x))
676 /* Test whether X is a NaN. */
678 # define isnand rpl_isnand
679 _GL_EXTERN_C int isnand (double x);
684 /* Test for NaN for 'long double' numbers. */
686 /* The original <math.h> included above provides a declaration of isnan
687 macro or (older) isnanl function. */
689 /* GCC 4.0 and newer provides three built-ins for isnan. */
691 # define isnanl(x) __builtin_isnanl ((long double)(x))
694 # define isnanl(x) isnan ((long double)(x))
697 /* Test whether X is a NaN. */
699 # define isnanl rpl_isnanl
700 _GL_EXTERN_C int isnanl (long double x);
704 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
707 /* We can't just use the isnanf macro (e.g.) as exposed by
708 isnanf.h (e.g.) here, because those may end up being macros
709 that recursively expand back to isnan. So use the gnulib
710 replacements for them directly. */
711 # if @HAVE_ISNANF@ && __GNUC__ >= 4
712 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
714 _GL_EXTERN_C int rpl_isnanf (float x);
715 # define gl_isnan_f(x) rpl_isnanf (x)
717 # if @HAVE_ISNAND@ && __GNUC__ >= 4
718 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
720 _GL_EXTERN_C int rpl_isnand (double x);
721 # define gl_isnan_d(x) rpl_isnand (x)
723 # if @HAVE_ISNANL@ && __GNUC__ >= 4
724 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
726 _GL_EXTERN_C int rpl_isnanl (long double x);
727 # define gl_isnan_l(x) rpl_isnanl (x)
731 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
732 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
737 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
738 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
739 __builtin_isnanf ((float)(x)))
741 /* Ensure isnan is a macro. */
745 #elif defined GNULIB_POSIXCHECK
747 _GL_WARN_REAL_FLOATING_DECL (isnan);
749 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
755 # if @REPLACE_SIGNBIT_USING_GCC@
757 /* GCC 4.0 and newer provides three built-ins for signbit. */
758 # define signbit(x) \
759 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
760 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
761 __builtin_signbitf (x))
763 # if @REPLACE_SIGNBIT@
765 _GL_EXTERN_C int gl_signbitf (float arg);
766 _GL_EXTERN_C int gl_signbitd (double arg);
767 _GL_EXTERN_C int gl_signbitl (long double arg);
768 # if __GNUC__ >= 2 && !__STRICT_ANSI__
769 # define _GL_NUM_UINT_WORDS(type) \
770 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
771 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
772 # define gl_signbitf_OPTIMIZED_MACRO
773 # define gl_signbitf(arg) \
774 ({ union { float _value; \
775 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
778 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
781 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
782 # define gl_signbitd_OPTIMIZED_MACRO
783 # define gl_signbitd(arg) \
784 ({ union { double _value; \
785 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
788 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
791 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
792 # define gl_signbitl_OPTIMIZED_MACRO
793 # define gl_signbitl(arg) \
794 ({ union { long double _value; \
795 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
798 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
802 # define signbit(x) \
803 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
804 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
807 #elif defined GNULIB_POSIXCHECK
809 _GL_WARN_REAL_FLOATING_DECL (signbit);
811 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
816 #endif /* _@GUARD_PREFIX@_MATH_H */
817 #endif /* _@GUARD_PREFIX@_MATH_H */