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)
190 # define ceilf rpl_ceilf
192 _GL_FUNCDECL_RPL (ceilf, float, (float x));
193 _GL_CXXALIAS_RPL (ceilf, float, (float x));
195 # if !@HAVE_DECL_CEILF@
196 _GL_FUNCDECL_SYS (ceilf, float, (float x));
198 _GL_CXXALIAS_SYS (ceilf, float, (float x));
200 _GL_CXXALIASWARN (ceilf);
201 #elif defined GNULIB_POSIXCHECK
203 # if HAVE_RAW_DECL_CEILF
204 _GL_WARN_ON_USE (ceilf, "ceilf is unportable - "
205 "use gnulib module ceilf for portability");
211 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
212 # define ceil rpl_ceil
214 _GL_FUNCDECL_RPL (ceil, double, (double x));
215 _GL_CXXALIAS_RPL (ceil, double, (double x));
217 _GL_CXXALIAS_SYS (ceil, double, (double x));
219 _GL_CXXALIASWARN (ceil);
224 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
225 # define ceill rpl_ceill
227 _GL_FUNCDECL_RPL (ceill, long double, (long double x));
228 _GL_CXXALIAS_RPL (ceill, long double, (long double x));
230 # if !@HAVE_DECL_CEILL@
231 _GL_FUNCDECL_SYS (ceill, long double, (long double x));
233 _GL_CXXALIAS_SYS (ceill, long double, (long double x));
235 _GL_CXXALIASWARN (ceill);
236 #elif defined GNULIB_POSIXCHECK
238 # if HAVE_RAW_DECL_CEILL
239 _GL_WARN_ON_USE (ceill, "ceill is unportable - "
240 "use gnulib module ceill for portability");
246 # if !@HAVE_COSL@ || !@HAVE_DECL_COSL@
247 _GL_FUNCDECL_SYS (cosl, long double, (long double x));
249 _GL_CXXALIAS_SYS (cosl, long double, (long double x));
250 _GL_CXXALIASWARN (cosl);
251 #elif defined GNULIB_POSIXCHECK
253 # if HAVE_RAW_DECL_COSL
254 _GL_WARN_ON_USE (cosl, "cosl is unportable - "
255 "use gnulib module mathl for portability");
261 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
262 _GL_FUNCDECL_SYS (expl, long double, (long double x));
264 _GL_CXXALIAS_SYS (expl, long double, (long double x));
265 _GL_CXXALIASWARN (expl);
266 #elif defined GNULIB_POSIXCHECK
268 # if HAVE_RAW_DECL_EXPL
269 _GL_WARN_ON_USE (expl, "expl is unportable - "
270 "use gnulib module mathl for portability");
276 # if @REPLACE_FLOORF@
277 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
278 # define floorf rpl_floorf
280 _GL_FUNCDECL_RPL (floorf, float, (float x));
281 _GL_CXXALIAS_RPL (floorf, float, (float x));
283 # if !@HAVE_DECL_FLOORF@
284 _GL_FUNCDECL_SYS (floorf, float, (float x));
286 _GL_CXXALIAS_SYS (floorf, float, (float x));
288 _GL_CXXALIASWARN (floorf);
289 #elif defined GNULIB_POSIXCHECK
291 # if HAVE_RAW_DECL_FLOORF
292 _GL_WARN_ON_USE (floorf, "floorf is unportable - "
293 "use gnulib module floorf for portability");
299 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
300 # define floor rpl_floor
302 _GL_FUNCDECL_RPL (floor, double, (double x));
303 _GL_CXXALIAS_RPL (floor, double, (double x));
305 _GL_CXXALIAS_SYS (floor, double, (double x));
307 _GL_CXXALIASWARN (floor);
311 # if @REPLACE_FLOORL@
312 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
313 # define floorl rpl_floorl
315 _GL_FUNCDECL_RPL (floorl, long double, (long double x));
316 _GL_CXXALIAS_RPL (floorl, long double, (long double x));
318 # if !@HAVE_DECL_FLOORL@
319 _GL_FUNCDECL_SYS (floorl, long double, (long double x));
321 _GL_CXXALIAS_SYS (floorl, long double, (long double x));
323 _GL_CXXALIASWARN (floorl);
324 #elif defined GNULIB_POSIXCHECK
326 # if HAVE_RAW_DECL_FLOORL
327 _GL_WARN_ON_USE (floorl, "floorl is unportable - "
328 "use gnulib module floorl for portability");
336 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
337 If x is zero: mantissa = x, exp = 0.
338 If x is infinite or NaN: mantissa = x, exp unspecified.
339 Store exp in *EXPPTR and return mantissa. */
340 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
341 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
342 # define frexpl rpl_frexpl
344 _GL_FUNCDECL_RPL (frexpl, long double,
345 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
346 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
348 # if !@HAVE_DECL_FREXPL@
349 _GL_FUNCDECL_SYS (frexpl, long double,
350 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
353 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
356 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
357 _GL_CXXALIASWARN (frexpl);
359 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
361 # if HAVE_RAW_DECL_FREXPL
362 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
363 "use gnulib module frexpl for portability");
368 /* Return x * 2^exp. */
369 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
370 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
371 # define ldexpl rpl_ldexpl
373 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
374 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
376 # if !@HAVE_DECL_LDEXPL@
377 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
380 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
384 _GL_CXXALIASWARN (ldexpl);
386 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
388 # if HAVE_RAW_DECL_LDEXPL
389 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
390 "use gnulib module ldexpl for portability");
396 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
397 _GL_FUNCDECL_SYS (logl, long double, (long double x));
399 _GL_CXXALIAS_SYS (logl, long double, (long double x));
400 _GL_CXXALIASWARN (logl);
401 #elif defined GNULIB_POSIXCHECK
403 # if HAVE_RAW_DECL_LOGL
404 _GL_WARN_ON_USE (logl, "logl is unportable - "
405 "use gnulib module mathl for portability");
411 # if @REPLACE_ROUNDF@
412 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
414 # define roundf rpl_roundf
416 _GL_FUNCDECL_RPL (roundf, float, (float x));
417 _GL_CXXALIAS_RPL (roundf, float, (float x));
419 # if !@HAVE_DECL_ROUNDF@
420 _GL_FUNCDECL_SYS (roundf, float, (float x));
422 _GL_CXXALIAS_SYS (roundf, float, (float x));
424 _GL_CXXALIASWARN (roundf);
425 #elif defined GNULIB_POSIXCHECK
427 # if HAVE_RAW_DECL_ROUNDF
428 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
429 "use gnulib module roundf for portability");
435 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
437 # define round rpl_round
439 _GL_FUNCDECL_RPL (round, double, (double x));
440 _GL_CXXALIAS_RPL (round, double, (double x));
442 # if !@HAVE_DECL_ROUND@
443 _GL_FUNCDECL_SYS (round, double, (double x));
445 _GL_CXXALIAS_SYS (round, double, (double x));
447 _GL_CXXALIASWARN (round);
448 #elif defined GNULIB_POSIXCHECK
450 # if HAVE_RAW_DECL_ROUND
451 _GL_WARN_ON_USE (round, "round is unportable - "
452 "use gnulib module round for portability");
457 # if @REPLACE_ROUNDL@
458 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
460 # define roundl rpl_roundl
462 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
463 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
465 # if !@HAVE_DECL_ROUNDL@
466 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
468 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
470 _GL_CXXALIASWARN (roundl);
471 #elif defined GNULIB_POSIXCHECK
473 # if HAVE_RAW_DECL_ROUNDL
474 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
475 "use gnulib module roundl for portability");
481 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
482 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
484 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
485 _GL_CXXALIASWARN (sinl);
486 #elif defined GNULIB_POSIXCHECK
488 # if HAVE_RAW_DECL_SINL
489 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
490 "use gnulib module mathl for portability");
496 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
497 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
499 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
500 _GL_CXXALIASWARN (sqrtl);
501 #elif defined GNULIB_POSIXCHECK
503 # if HAVE_RAW_DECL_SQRTL
504 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
505 "use gnulib module mathl for portability");
511 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
512 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
514 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
515 _GL_CXXALIASWARN (tanl);
516 #elif defined GNULIB_POSIXCHECK
518 # if HAVE_RAW_DECL_TANL
519 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
520 "use gnulib module mathl for portability");
526 # if @REPLACE_TRUNCF@
527 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
528 # define truncf rpl_truncf
530 _GL_FUNCDECL_RPL (truncf, float, (float x));
531 _GL_CXXALIAS_RPL (truncf, float, (float x));
533 # if !@HAVE_DECL_TRUNCF@
534 _GL_FUNCDECL_SYS (truncf, float, (float x));
536 _GL_CXXALIAS_SYS (truncf, float, (float x));
538 _GL_CXXALIASWARN (truncf);
539 #elif defined GNULIB_POSIXCHECK
541 # if HAVE_RAW_DECL_TRUNCF
542 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
543 "use gnulib module truncf for portability");
549 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
550 # define trunc rpl_trunc
552 _GL_FUNCDECL_RPL (trunc, double, (double x));
553 _GL_CXXALIAS_RPL (trunc, double, (double x));
555 # if !@HAVE_DECL_TRUNC@
556 _GL_FUNCDECL_SYS (trunc, double, (double x));
558 _GL_CXXALIAS_SYS (trunc, double, (double x));
560 _GL_CXXALIASWARN (trunc);
561 #elif defined GNULIB_POSIXCHECK
563 # if HAVE_RAW_DECL_TRUNC
564 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
565 "use gnulib module trunc for portability");
570 # if @REPLACE_TRUNCL@
571 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
573 # define truncl rpl_truncl
575 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
576 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
578 # if !@HAVE_DECL_TRUNCL@
579 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
581 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
583 _GL_CXXALIASWARN (truncl);
584 #elif defined GNULIB_POSIXCHECK
586 # if HAVE_RAW_DECL_TRUNCL
587 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
588 "use gnulib module truncl for portability");
593 #if @GNULIB_ISFINITE@
594 # if @REPLACE_ISFINITE@
595 _GL_EXTERN_C int gl_isfinitef (float x);
596 _GL_EXTERN_C int gl_isfinited (double x);
597 _GL_EXTERN_C int gl_isfinitel (long double x);
599 # define isfinite(x) \
600 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
601 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
604 #elif defined GNULIB_POSIXCHECK
605 # if defined isfinite
606 _GL_WARN_REAL_FLOATING_DECL (isfinite);
608 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
615 _GL_EXTERN_C int gl_isinff (float x);
616 _GL_EXTERN_C int gl_isinfd (double x);
617 _GL_EXTERN_C int gl_isinfl (long double x);
620 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
621 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
624 #elif defined GNULIB_POSIXCHECK
626 _GL_WARN_REAL_FLOATING_DECL (isinf);
628 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
634 /* Test for NaN for 'float' numbers. */
636 /* The original <math.h> included above provides a declaration of isnan macro
637 or (older) isnanf function. */
639 /* GCC 4.0 and newer provides three built-ins for isnan. */
641 # define isnanf(x) __builtin_isnanf ((float)(x))
644 # define isnanf(x) isnan ((float)(x))
647 /* Test whether X is a NaN. */
649 # define isnanf rpl_isnanf
650 _GL_EXTERN_C int isnanf (float x);
655 /* Test for NaN for 'double' numbers.
656 This function is a gnulib extension, unlike isnan() which applied only
657 to 'double' numbers earlier but now is a type-generic macro. */
659 /* The original <math.h> included above provides a declaration of isnan
662 /* GCC 4.0 and newer provides three built-ins for isnan. */
664 # define isnand(x) __builtin_isnan ((double)(x))
667 # define isnand(x) isnan ((double)(x))
670 /* Test whether X is a NaN. */
672 # define isnand rpl_isnand
673 _GL_EXTERN_C int isnand (double x);
678 /* Test for NaN for 'long double' numbers. */
680 /* The original <math.h> included above provides a declaration of isnan
681 macro or (older) isnanl function. */
683 /* GCC 4.0 and newer provides three built-ins for isnan. */
685 # define isnanl(x) __builtin_isnanl ((long double)(x))
688 # define isnanl(x) isnan ((long double)(x))
691 /* Test whether X is a NaN. */
693 # define isnanl rpl_isnanl
694 _GL_EXTERN_C int isnanl (long double x);
698 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
701 /* We can't just use the isnanf macro (e.g.) as exposed by
702 isnanf.h (e.g.) here, because those may end up being macros
703 that recursively expand back to isnan. So use the gnulib
704 replacements for them directly. */
705 # if @HAVE_ISNANF@ && __GNUC__ >= 4
706 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
708 _GL_EXTERN_C int rpl_isnanf (float x);
709 # define gl_isnan_f(x) rpl_isnanf (x)
711 # if @HAVE_ISNAND@ && __GNUC__ >= 4
712 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
714 _GL_EXTERN_C int rpl_isnand (double x);
715 # define gl_isnan_d(x) rpl_isnand (x)
717 # if @HAVE_ISNANL@ && __GNUC__ >= 4
718 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
720 _GL_EXTERN_C int rpl_isnanl (long double x);
721 # define gl_isnan_l(x) rpl_isnanl (x)
725 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
726 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
731 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
732 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
733 __builtin_isnanf ((float)(x)))
735 /* Ensure isnan is a macro. */
739 #elif defined GNULIB_POSIXCHECK
741 _GL_WARN_REAL_FLOATING_DECL (isnan);
743 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
749 # if @REPLACE_SIGNBIT_USING_GCC@
751 /* GCC 4.0 and newer provides three built-ins for signbit. */
752 # define signbit(x) \
753 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
754 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
755 __builtin_signbitf (x))
757 # if @REPLACE_SIGNBIT@
759 _GL_EXTERN_C int gl_signbitf (float arg);
760 _GL_EXTERN_C int gl_signbitd (double arg);
761 _GL_EXTERN_C int gl_signbitl (long double arg);
762 # if __GNUC__ >= 2 && !__STRICT_ANSI__
763 # define _GL_NUM_UINT_WORDS(type) \
764 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
765 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
766 # define gl_signbitf_OPTIMIZED_MACRO
767 # define gl_signbitf(arg) \
768 ({ union { float _value; \
769 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
772 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
775 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
776 # define gl_signbitd_OPTIMIZED_MACRO
777 # define gl_signbitd(arg) \
778 ({ union { double _value; \
779 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
782 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
785 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
786 # define gl_signbitl_OPTIMIZED_MACRO
787 # define gl_signbitl(arg) \
788 ({ union { long double _value; \
789 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
792 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
796 # define signbit(x) \
797 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
798 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
801 #elif defined GNULIB_POSIXCHECK
803 _GL_WARN_REAL_FLOATING_DECL (signbit);
805 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
810 #endif /* _@GUARD_PREFIX@_MATH_H */
811 #endif /* _@GUARD_PREFIX@_MATH_H */