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");
288 _GL_FUNCDECL_SYS (fabsf, float, (float x));
290 _GL_CXXALIAS_SYS (fabsf, float, (float x));
291 _GL_CXXALIASWARN (fabsf);
292 #elif defined GNULIB_POSIXCHECK
294 # if HAVE_RAW_DECL_FABSF
295 _GL_WARN_ON_USE (fabsf, "fabsf is unportable - "
296 "use gnulib module fabsf for portability");
302 # if @REPLACE_FLOORF@
303 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
305 # define floorf rpl_floorf
307 _GL_FUNCDECL_RPL (floorf, float, (float x));
308 _GL_CXXALIAS_RPL (floorf, float, (float x));
310 # if !@HAVE_DECL_FLOORF@
311 _GL_FUNCDECL_SYS (floorf, float, (float x));
313 _GL_CXXALIAS_SYS (floorf, float, (float x));
315 _GL_CXXALIASWARN (floorf);
316 #elif defined GNULIB_POSIXCHECK
318 # if HAVE_RAW_DECL_FLOORF
319 _GL_WARN_ON_USE (floorf, "floorf is unportable - "
320 "use gnulib module floorf for portability");
326 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
327 # define floor rpl_floor
329 _GL_FUNCDECL_RPL (floor, double, (double x));
330 _GL_CXXALIAS_RPL (floor, double, (double x));
332 _GL_CXXALIAS_SYS (floor, double, (double x));
334 _GL_CXXALIASWARN (floor);
338 # if @REPLACE_FLOORL@
339 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
341 # define floorl rpl_floorl
343 _GL_FUNCDECL_RPL (floorl, long double, (long double x));
344 _GL_CXXALIAS_RPL (floorl, long double, (long double x));
346 # if !@HAVE_DECL_FLOORL@
347 _GL_FUNCDECL_SYS (floorl, long double, (long double x));
349 _GL_CXXALIAS_SYS (floorl, long double, (long double x));
351 _GL_CXXALIASWARN (floorl);
352 #elif defined GNULIB_POSIXCHECK
354 # if HAVE_RAW_DECL_FLOORL
355 _GL_WARN_ON_USE (floorl, "floorl is unportable - "
356 "use gnulib module floorl for portability");
364 _GL_FUNCDECL_SYS (fmodf, float, (float x, float y));
366 _GL_CXXALIAS_SYS (fmodf, float, (float x, float y));
367 _GL_CXXALIASWARN (fmodf);
368 #elif defined GNULIB_POSIXCHECK
370 # if HAVE_RAW_DECL_FMODF
371 _GL_WARN_ON_USE (fmodf, "fmodf is unportable - "
372 "use gnulib module fmodf for portability");
380 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
381 If x is zero: mantissa = x, exp = 0.
382 If x is infinite or NaN: mantissa = x, exp unspecified.
383 Store exp in *EXPPTR and return mantissa. */
384 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
385 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
387 # define frexpl rpl_frexpl
389 _GL_FUNCDECL_RPL (frexpl, long double,
390 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
391 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
393 # if !@HAVE_DECL_FREXPL@
394 _GL_FUNCDECL_SYS (frexpl, long double,
395 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
398 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
401 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
402 _GL_CXXALIASWARN (frexpl);
404 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
406 # if HAVE_RAW_DECL_FREXPL
407 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
408 "use gnulib module frexpl for portability");
413 /* Return x * 2^exp. */
414 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
415 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
417 # define ldexpl rpl_ldexpl
419 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
420 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
422 # if !@HAVE_DECL_LDEXPL@
423 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
426 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
430 _GL_CXXALIASWARN (ldexpl);
432 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
434 # if HAVE_RAW_DECL_LDEXPL
435 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
436 "use gnulib module ldexpl for portability");
442 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
443 _GL_FUNCDECL_SYS (logl, long double, (long double x));
445 _GL_CXXALIAS_SYS (logl, long double, (long double x));
446 _GL_CXXALIASWARN (logl);
447 #elif defined GNULIB_POSIXCHECK
449 # if HAVE_RAW_DECL_LOGL
450 _GL_WARN_ON_USE (logl, "logl is unportable - "
451 "use gnulib module mathl for portability");
457 # if @REPLACE_ROUNDF@
458 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
460 # define roundf rpl_roundf
462 _GL_FUNCDECL_RPL (roundf, float, (float x));
463 _GL_CXXALIAS_RPL (roundf, float, (float x));
465 # if !@HAVE_DECL_ROUNDF@
466 _GL_FUNCDECL_SYS (roundf, float, (float x));
468 _GL_CXXALIAS_SYS (roundf, float, (float x));
470 _GL_CXXALIASWARN (roundf);
471 #elif defined GNULIB_POSIXCHECK
473 # if HAVE_RAW_DECL_ROUNDF
474 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
475 "use gnulib module roundf for portability");
481 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
483 # define round rpl_round
485 _GL_FUNCDECL_RPL (round, double, (double x));
486 _GL_CXXALIAS_RPL (round, double, (double x));
488 # if !@HAVE_DECL_ROUND@
489 _GL_FUNCDECL_SYS (round, double, (double x));
491 _GL_CXXALIAS_SYS (round, double, (double x));
493 _GL_CXXALIASWARN (round);
494 #elif defined GNULIB_POSIXCHECK
496 # if HAVE_RAW_DECL_ROUND
497 _GL_WARN_ON_USE (round, "round is unportable - "
498 "use gnulib module round for portability");
503 # if @REPLACE_ROUNDL@
504 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
506 # define roundl rpl_roundl
508 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
509 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
511 # if !@HAVE_DECL_ROUNDL@
512 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
514 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
516 _GL_CXXALIASWARN (roundl);
517 #elif defined GNULIB_POSIXCHECK
519 # if HAVE_RAW_DECL_ROUNDL
520 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
521 "use gnulib module roundl for portability");
527 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
528 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
530 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
531 _GL_CXXALIASWARN (sinl);
532 #elif defined GNULIB_POSIXCHECK
534 # if HAVE_RAW_DECL_SINL
535 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
536 "use gnulib module mathl for portability");
542 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
543 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
545 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
546 _GL_CXXALIASWARN (sqrtl);
547 #elif defined GNULIB_POSIXCHECK
549 # if HAVE_RAW_DECL_SQRTL
550 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
551 "use gnulib module mathl for portability");
557 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
558 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
560 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
561 _GL_CXXALIASWARN (tanl);
562 #elif defined GNULIB_POSIXCHECK
564 # if HAVE_RAW_DECL_TANL
565 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
566 "use gnulib module mathl for portability");
572 # if @REPLACE_TRUNCF@
573 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
574 # define truncf rpl_truncf
576 _GL_FUNCDECL_RPL (truncf, float, (float x));
577 _GL_CXXALIAS_RPL (truncf, float, (float x));
579 # if !@HAVE_DECL_TRUNCF@
580 _GL_FUNCDECL_SYS (truncf, float, (float x));
582 _GL_CXXALIAS_SYS (truncf, float, (float x));
584 _GL_CXXALIASWARN (truncf);
585 #elif defined GNULIB_POSIXCHECK
587 # if HAVE_RAW_DECL_TRUNCF
588 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
589 "use gnulib module truncf for portability");
595 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
596 # define trunc rpl_trunc
598 _GL_FUNCDECL_RPL (trunc, double, (double x));
599 _GL_CXXALIAS_RPL (trunc, double, (double x));
601 # if !@HAVE_DECL_TRUNC@
602 _GL_FUNCDECL_SYS (trunc, double, (double x));
604 _GL_CXXALIAS_SYS (trunc, double, (double x));
606 _GL_CXXALIASWARN (trunc);
607 #elif defined GNULIB_POSIXCHECK
609 # if HAVE_RAW_DECL_TRUNC
610 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
611 "use gnulib module trunc for portability");
616 # if @REPLACE_TRUNCL@
617 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
619 # define truncl rpl_truncl
621 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
622 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
624 # if !@HAVE_DECL_TRUNCL@
625 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
627 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
629 _GL_CXXALIASWARN (truncl);
630 #elif defined GNULIB_POSIXCHECK
632 # if HAVE_RAW_DECL_TRUNCL
633 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
634 "use gnulib module truncl for portability");
639 #if @GNULIB_ISFINITE@
640 # if @REPLACE_ISFINITE@
641 _GL_EXTERN_C int gl_isfinitef (float x);
642 _GL_EXTERN_C int gl_isfinited (double x);
643 _GL_EXTERN_C int gl_isfinitel (long double x);
645 # define isfinite(x) \
646 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
647 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
650 #elif defined GNULIB_POSIXCHECK
651 # if defined isfinite
652 _GL_WARN_REAL_FLOATING_DECL (isfinite);
654 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
661 _GL_EXTERN_C int gl_isinff (float x);
662 _GL_EXTERN_C int gl_isinfd (double x);
663 _GL_EXTERN_C int gl_isinfl (long double x);
666 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
667 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
670 #elif defined GNULIB_POSIXCHECK
672 _GL_WARN_REAL_FLOATING_DECL (isinf);
674 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
680 /* Test for NaN for 'float' numbers. */
682 /* The original <math.h> included above provides a declaration of isnan macro
683 or (older) isnanf function. */
685 /* GCC 4.0 and newer provides three built-ins for isnan. */
687 # define isnanf(x) __builtin_isnanf ((float)(x))
690 # define isnanf(x) isnan ((float)(x))
693 /* Test whether X is a NaN. */
695 # define isnanf rpl_isnanf
696 _GL_EXTERN_C int isnanf (float x);
701 /* Test for NaN for 'double' numbers.
702 This function is a gnulib extension, unlike isnan() which applied only
703 to 'double' numbers earlier but now is a type-generic macro. */
705 /* The original <math.h> included above provides a declaration of isnan
708 /* GCC 4.0 and newer provides three built-ins for isnan. */
710 # define isnand(x) __builtin_isnan ((double)(x))
713 # define isnand(x) isnan ((double)(x))
716 /* Test whether X is a NaN. */
718 # define isnand rpl_isnand
719 _GL_EXTERN_C int isnand (double x);
724 /* Test for NaN for 'long double' numbers. */
726 /* The original <math.h> included above provides a declaration of isnan
727 macro or (older) isnanl function. */
729 /* GCC 4.0 and newer provides three built-ins for isnan. */
731 # define isnanl(x) __builtin_isnanl ((long double)(x))
734 # define isnanl(x) isnan ((long double)(x))
737 /* Test whether X is a NaN. */
739 # define isnanl rpl_isnanl
740 _GL_EXTERN_C int isnanl (long double x);
744 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
747 /* We can't just use the isnanf macro (e.g.) as exposed by
748 isnanf.h (e.g.) here, because those may end up being macros
749 that recursively expand back to isnan. So use the gnulib
750 replacements for them directly. */
751 # if @HAVE_ISNANF@ && __GNUC__ >= 4
752 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
754 _GL_EXTERN_C int rpl_isnanf (float x);
755 # define gl_isnan_f(x) rpl_isnanf (x)
757 # if @HAVE_ISNAND@ && __GNUC__ >= 4
758 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
760 _GL_EXTERN_C int rpl_isnand (double x);
761 # define gl_isnan_d(x) rpl_isnand (x)
763 # if @HAVE_ISNANL@ && __GNUC__ >= 4
764 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
766 _GL_EXTERN_C int rpl_isnanl (long double x);
767 # define gl_isnan_l(x) rpl_isnanl (x)
771 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
772 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
777 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
778 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
779 __builtin_isnanf ((float)(x)))
781 /* Ensure isnan is a macro. */
785 #elif defined GNULIB_POSIXCHECK
787 _GL_WARN_REAL_FLOATING_DECL (isnan);
789 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
795 # if @REPLACE_SIGNBIT_USING_GCC@
797 /* GCC 4.0 and newer provides three built-ins for signbit. */
798 # define signbit(x) \
799 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
800 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
801 __builtin_signbitf (x))
803 # if @REPLACE_SIGNBIT@
805 _GL_EXTERN_C int gl_signbitf (float arg);
806 _GL_EXTERN_C int gl_signbitd (double arg);
807 _GL_EXTERN_C int gl_signbitl (long double arg);
808 # if __GNUC__ >= 2 && !__STRICT_ANSI__
809 # define _GL_NUM_UINT_WORDS(type) \
810 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
811 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
812 # define gl_signbitf_OPTIMIZED_MACRO
813 # define gl_signbitf(arg) \
814 ({ union { float _value; \
815 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
818 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
821 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
822 # define gl_signbitd_OPTIMIZED_MACRO
823 # define gl_signbitd(arg) \
824 ({ union { double _value; \
825 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
828 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
831 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
832 # define gl_signbitl_OPTIMIZED_MACRO
833 # define gl_signbitl(arg) \
834 ({ union { long double _value; \
835 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
838 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
842 # define signbit(x) \
843 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
844 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
847 #elif defined GNULIB_POSIXCHECK
849 _GL_WARN_REAL_FLOATING_DECL (signbit);
851 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
856 #endif /* _@GUARD_PREFIX@_MATH_H */
857 #endif /* _@GUARD_PREFIX@_MATH_H */