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. */
348 _GL_FUNCDECL_SYS (frexpf, float, (float x, int *expptr) _GL_ARG_NONNULL ((2)));
350 _GL_CXXALIAS_SYS (frexpf, float, (float x, int *expptr));
351 _GL_CXXALIASWARN (frexpf);
352 #elif defined GNULIB_POSIXCHECK
354 # if HAVE_RAW_DECL_FREXPF
355 _GL_WARN_ON_USE (frexpf, "frexpf is unportable - "
356 "use gnulib module frexpf for portability");
363 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
364 If x is zero: mantissa = x, exp = 0.
365 If x is infinite or NaN: mantissa = x, exp unspecified.
366 Store exp in *EXPPTR and return mantissa. */
369 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
370 # define frexp rpl_frexp
372 _GL_FUNCDECL_RPL (frexp, double, (double x, int *expptr) _GL_ARG_NONNULL ((2)));
373 _GL_CXXALIAS_RPL (frexp, double, (double x, int *expptr));
375 _GL_CXXALIAS_SYS (frexp, double, (double x, int *expptr));
377 _GL_CXXALIASWARN (frexp);
378 #elif defined GNULIB_POSIXCHECK
380 /* Assume frexp is always declared. */
381 _GL_WARN_ON_USE (frexp, "frexp is unportable - "
382 "use gnulib module frexp for portability");
388 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
389 If x is zero: mantissa = x, exp = 0.
390 If x is infinite or NaN: mantissa = x, exp unspecified.
391 Store exp in *EXPPTR and return mantissa. */
392 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
393 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
395 # define frexpl rpl_frexpl
397 _GL_FUNCDECL_RPL (frexpl, long double,
398 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
399 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
401 # if !@HAVE_DECL_FREXPL@
402 _GL_FUNCDECL_SYS (frexpl, long double,
403 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
406 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
409 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
410 _GL_CXXALIASWARN (frexpl);
412 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
414 # if HAVE_RAW_DECL_FREXPL
415 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
416 "use gnulib module frexpl for portability");
421 /* Return x * 2^exp. */
422 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
423 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
425 # define ldexpl rpl_ldexpl
427 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
428 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
430 # if !@HAVE_DECL_LDEXPL@
431 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
434 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
438 _GL_CXXALIASWARN (ldexpl);
440 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
442 # if HAVE_RAW_DECL_LDEXPL
443 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
444 "use gnulib module ldexpl for portability");
450 # if !@HAVE_DECL_LOGB@
451 _GL_EXTERN_C double logb (double x);
453 #elif defined GNULIB_POSIXCHECK
455 # if HAVE_RAW_DECL_LOGB
456 _GL_WARN_ON_USE (logb, "logb is unportable - "
457 "use gnulib module logb for portability");
463 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
464 _GL_FUNCDECL_SYS (logl, long double, (long double x));
466 _GL_CXXALIAS_SYS (logl, long double, (long double x));
467 _GL_CXXALIASWARN (logl);
468 #elif defined GNULIB_POSIXCHECK
470 # if HAVE_RAW_DECL_LOGL
471 _GL_WARN_ON_USE (logl, "logl is unportable - "
472 "use gnulib module mathl for portability");
480 _GL_FUNCDECL_SYS (modff, float, (float x, float *iptr) _GL_ARG_NONNULL ((2)));
482 _GL_CXXALIAS_SYS (modff, float, (float x, float *iptr));
483 _GL_CXXALIASWARN (modff);
484 #elif defined GNULIB_POSIXCHECK
486 # if HAVE_RAW_DECL_MODFF
487 _GL_WARN_ON_USE (modff, "modff is unportable - "
488 "use gnulib module modff for portability");
494 # if @REPLACE_ROUNDF@
495 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
497 # define roundf rpl_roundf
499 _GL_FUNCDECL_RPL (roundf, float, (float x));
500 _GL_CXXALIAS_RPL (roundf, float, (float x));
502 # if !@HAVE_DECL_ROUNDF@
503 _GL_FUNCDECL_SYS (roundf, float, (float x));
505 _GL_CXXALIAS_SYS (roundf, float, (float x));
507 _GL_CXXALIASWARN (roundf);
508 #elif defined GNULIB_POSIXCHECK
510 # if HAVE_RAW_DECL_ROUNDF
511 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
512 "use gnulib module roundf for portability");
518 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
520 # define round rpl_round
522 _GL_FUNCDECL_RPL (round, double, (double x));
523 _GL_CXXALIAS_RPL (round, double, (double x));
525 # if !@HAVE_DECL_ROUND@
526 _GL_FUNCDECL_SYS (round, double, (double x));
528 _GL_CXXALIAS_SYS (round, double, (double x));
530 _GL_CXXALIASWARN (round);
531 #elif defined GNULIB_POSIXCHECK
533 # if HAVE_RAW_DECL_ROUND
534 _GL_WARN_ON_USE (round, "round is unportable - "
535 "use gnulib module round for portability");
540 # if @REPLACE_ROUNDL@
541 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
543 # define roundl rpl_roundl
545 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
546 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
548 # if !@HAVE_DECL_ROUNDL@
549 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
551 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
553 _GL_CXXALIASWARN (roundl);
554 #elif defined GNULIB_POSIXCHECK
556 # if HAVE_RAW_DECL_ROUNDL
557 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
558 "use gnulib module roundl for portability");
564 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
565 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
567 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
568 _GL_CXXALIASWARN (sinl);
569 #elif defined GNULIB_POSIXCHECK
571 # if HAVE_RAW_DECL_SINL
572 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
573 "use gnulib module mathl for portability");
579 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
580 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
582 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
583 _GL_CXXALIASWARN (sqrtl);
584 #elif defined GNULIB_POSIXCHECK
586 # if HAVE_RAW_DECL_SQRTL
587 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
588 "use gnulib module mathl for portability");
594 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
595 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
597 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
598 _GL_CXXALIASWARN (tanl);
599 #elif defined GNULIB_POSIXCHECK
601 # if HAVE_RAW_DECL_TANL
602 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
603 "use gnulib module mathl for portability");
609 # if @REPLACE_TRUNCF@
610 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
611 # define truncf rpl_truncf
613 _GL_FUNCDECL_RPL (truncf, float, (float x));
614 _GL_CXXALIAS_RPL (truncf, float, (float x));
616 # if !@HAVE_DECL_TRUNCF@
617 _GL_FUNCDECL_SYS (truncf, float, (float x));
619 _GL_CXXALIAS_SYS (truncf, float, (float x));
621 _GL_CXXALIASWARN (truncf);
622 #elif defined GNULIB_POSIXCHECK
624 # if HAVE_RAW_DECL_TRUNCF
625 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
626 "use gnulib module truncf for portability");
632 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
633 # define trunc rpl_trunc
635 _GL_FUNCDECL_RPL (trunc, double, (double x));
636 _GL_CXXALIAS_RPL (trunc, double, (double x));
638 # if !@HAVE_DECL_TRUNC@
639 _GL_FUNCDECL_SYS (trunc, double, (double x));
641 _GL_CXXALIAS_SYS (trunc, double, (double x));
643 _GL_CXXALIASWARN (trunc);
644 #elif defined GNULIB_POSIXCHECK
646 # if HAVE_RAW_DECL_TRUNC
647 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
648 "use gnulib module trunc for portability");
653 # if @REPLACE_TRUNCL@
654 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
656 # define truncl rpl_truncl
658 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
659 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
661 # if !@HAVE_DECL_TRUNCL@
662 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
664 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
666 _GL_CXXALIASWARN (truncl);
667 #elif defined GNULIB_POSIXCHECK
669 # if HAVE_RAW_DECL_TRUNCL
670 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
671 "use gnulib module truncl for portability");
676 /* Definitions of function-like macros come here, after the function
680 #if @GNULIB_ISFINITE@
681 # if @REPLACE_ISFINITE@
682 _GL_EXTERN_C int gl_isfinitef (float x);
683 _GL_EXTERN_C int gl_isfinited (double x);
684 _GL_EXTERN_C int gl_isfinitel (long double x);
686 # define isfinite(x) \
687 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
688 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
691 #elif defined GNULIB_POSIXCHECK
692 # if defined isfinite
693 _GL_WARN_REAL_FLOATING_DECL (isfinite);
695 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
702 _GL_EXTERN_C int gl_isinff (float x);
703 _GL_EXTERN_C int gl_isinfd (double x);
704 _GL_EXTERN_C int gl_isinfl (long double x);
707 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
708 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
711 #elif defined GNULIB_POSIXCHECK
713 _GL_WARN_REAL_FLOATING_DECL (isinf);
715 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
721 /* Test for NaN for 'float' numbers. */
723 /* The original <math.h> included above provides a declaration of isnan macro
724 or (older) isnanf function. */
726 /* GCC 4.0 and newer provides three built-ins for isnan. */
728 # define isnanf(x) __builtin_isnanf ((float)(x))
731 # define isnanf(x) isnan ((float)(x))
734 /* Test whether X is a NaN. */
736 # define isnanf rpl_isnanf
737 _GL_EXTERN_C int isnanf (float x);
742 /* Test for NaN for 'double' numbers.
743 This function is a gnulib extension, unlike isnan() which applied only
744 to 'double' numbers earlier but now is a type-generic macro. */
746 /* The original <math.h> included above provides a declaration of isnan
749 /* GCC 4.0 and newer provides three built-ins for isnan. */
751 # define isnand(x) __builtin_isnan ((double)(x))
754 # define isnand(x) isnan ((double)(x))
757 /* Test whether X is a NaN. */
759 # define isnand rpl_isnand
760 _GL_EXTERN_C int isnand (double x);
765 /* Test for NaN for 'long double' numbers. */
767 /* The original <math.h> included above provides a declaration of isnan
768 macro or (older) isnanl function. */
770 /* GCC 4.0 and newer provides three built-ins for isnan. */
772 # define isnanl(x) __builtin_isnanl ((long double)(x))
775 # define isnanl(x) isnan ((long double)(x))
778 /* Test whether X is a NaN. */
780 # define isnanl rpl_isnanl
781 _GL_EXTERN_C int isnanl (long double x);
785 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
788 /* We can't just use the isnanf macro (e.g.) as exposed by
789 isnanf.h (e.g.) here, because those may end up being macros
790 that recursively expand back to isnan. So use the gnulib
791 replacements for them directly. */
792 # if @HAVE_ISNANF@ && __GNUC__ >= 4
793 # define gl_isnan_f(x) __builtin_isnanf ((float)(x))
795 _GL_EXTERN_C int rpl_isnanf (float x);
796 # define gl_isnan_f(x) rpl_isnanf (x)
798 # if @HAVE_ISNAND@ && __GNUC__ >= 4
799 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
801 _GL_EXTERN_C int rpl_isnand (double x);
802 # define gl_isnan_d(x) rpl_isnand (x)
804 # if @HAVE_ISNANL@ && __GNUC__ >= 4
805 # define gl_isnan_l(x) __builtin_isnanl ((long double)(x))
807 _GL_EXTERN_C int rpl_isnanl (long double x);
808 # define gl_isnan_l(x) rpl_isnanl (x)
812 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
813 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
818 (sizeof (x) == sizeof (long double) ? __builtin_isnanl ((long double)(x)) : \
819 sizeof (x) == sizeof (double) ? __builtin_isnan ((double)(x)) : \
820 __builtin_isnanf ((float)(x)))
822 /* Ensure isnan is a macro. */
826 #elif defined GNULIB_POSIXCHECK
828 _GL_WARN_REAL_FLOATING_DECL (isnan);
830 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
836 # if @REPLACE_SIGNBIT_USING_GCC@
838 /* GCC 4.0 and newer provides three built-ins for signbit. */
839 # define signbit(x) \
840 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
841 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
842 __builtin_signbitf (x))
844 # if @REPLACE_SIGNBIT@
846 _GL_EXTERN_C int gl_signbitf (float arg);
847 _GL_EXTERN_C int gl_signbitd (double arg);
848 _GL_EXTERN_C int gl_signbitl (long double arg);
849 # if __GNUC__ >= 2 && !__STRICT_ANSI__
850 # define _GL_NUM_UINT_WORDS(type) \
851 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
852 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
853 # define gl_signbitf_OPTIMIZED_MACRO
854 # define gl_signbitf(arg) \
855 ({ union { float _value; \
856 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
859 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
862 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
863 # define gl_signbitd_OPTIMIZED_MACRO
864 # define gl_signbitd(arg) \
865 ({ union { double _value; \
866 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
869 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
872 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
873 # define gl_signbitl_OPTIMIZED_MACRO
874 # define gl_signbitl(arg) \
875 ({ union { long double _value; \
876 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
879 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
883 # define signbit(x) \
884 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
885 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
888 #elif defined GNULIB_POSIXCHECK
890 _GL_WARN_REAL_FLOATING_DECL (signbit);
892 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
897 #endif /* _@GUARD_PREFIX@_MATH_H */
898 #endif /* _@GUARD_PREFIX@_MATH_H */