1 /* A GNU-like <math.h>.
3 Copyright (C) 2002-2003, 2007-2010 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/>. */
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@
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@
77 /* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0. */
82 static float zero = 0.0f;
87 # define NAN (0.0f / 0.0f)
91 /* Solaris 10 defines HUGE_VAL, but as a function pointer rather
92 than a floating point constant. */
93 #if @REPLACE_HUGE_VAL@
95 # define HUGE_VAL (1.0 / 0.0)
102 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
103 If x is zero: mantissa = x, exp = 0.
104 If x is infinite or NaN: mantissa = x, exp unspecified.
105 Store exp in *EXPPTR and return mantissa. */
108 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
109 # define frexp rpl_frexp
111 _GL_FUNCDECL_RPL (frexp, double, (double x, int *expptr) _GL_ARG_NONNULL ((2)));
112 _GL_CXXALIAS_RPL (frexp, double, (double x, int *expptr));
114 _GL_CXXALIAS_SYS (frexp, double, (double x, int *expptr));
116 _GL_CXXALIASWARN (frexp);
117 #elif defined GNULIB_POSIXCHECK
119 /* Assume frexp is always declared. */
120 _GL_WARN_ON_USE (frexp, "frexp is unportable - "
121 "use gnulib module frexp for portability");
126 # if !@HAVE_DECL_LOGB@
127 _GL_EXTERN_C double logb (double x);
129 #elif defined GNULIB_POSIXCHECK
131 # if HAVE_RAW_DECL_LOGB
132 _GL_WARN_ON_USE (logb, "logb is unportable - "
133 "use gnulib module logb for portability");
139 # if !@HAVE_ACOSL@ || !@HAVE_DECL_ACOSL@
140 _GL_FUNCDECL_SYS (acosl, long double, (long double x));
142 _GL_CXXALIAS_SYS (acosl, long double, (long double x));
143 _GL_CXXALIASWARN (acosl);
144 #elif defined GNULIB_POSIXCHECK
146 # if HAVE_RAW_DECL_ACOSL
147 _GL_WARN_ON_USE (acosl, "acosl is unportable - "
148 "use gnulib module mathl for portability");
154 # if !@HAVE_ASINL@ || !@HAVE_DECL_ASINL@
155 _GL_FUNCDECL_SYS (asinl, long double, (long double x));
157 _GL_CXXALIAS_SYS (asinl, long double, (long double x));
158 _GL_CXXALIASWARN (asinl);
159 #elif defined GNULIB_POSIXCHECK
161 # if HAVE_RAW_DECL_ASINL
162 _GL_WARN_ON_USE (asinl, "asinl is unportable - "
163 "use gnulib module mathl for portability");
169 # if !@HAVE_ATANL@ || !@HAVE_DECL_ATANL@
170 _GL_FUNCDECL_SYS (atanl, long double, (long double x));
172 _GL_CXXALIAS_SYS (atanl, long double, (long double x));
173 _GL_CXXALIASWARN (atanl);
174 #elif defined GNULIB_POSIXCHECK
176 # if HAVE_RAW_DECL_ATANL
177 _GL_WARN_ON_USE (atanl, "atanl is unportable - "
178 "use gnulib module mathl for portability");
185 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
186 # define ceilf rpl_ceilf
188 _GL_FUNCDECL_RPL (ceilf, float, (float x));
189 _GL_CXXALIAS_RPL (ceilf, float, (float x));
191 # if !@HAVE_DECL_CEILF@
192 _GL_FUNCDECL_SYS (ceilf, float, (float x));
194 _GL_CXXALIAS_SYS (ceilf, float, (float x));
196 _GL_CXXALIASWARN (ceilf);
197 #elif defined GNULIB_POSIXCHECK
199 # if HAVE_RAW_DECL_CEILF
200 _GL_WARN_ON_USE (ceilf, "ceilf is unportable - "
201 "use gnulib module ceilf for portability");
207 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
208 # define ceill rpl_ceill
210 _GL_FUNCDECL_RPL (ceill, long double, (long double x));
211 _GL_CXXALIAS_RPL (ceill, long double, (long double x));
213 # if !@HAVE_DECL_CEILL@
214 _GL_FUNCDECL_SYS (ceill, long double, (long double x));
216 _GL_CXXALIAS_SYS (ceill, long double, (long double x));
218 _GL_CXXALIASWARN (ceill);
219 #elif defined GNULIB_POSIXCHECK
221 # if HAVE_RAW_DECL_CEILL
222 _GL_WARN_ON_USE (ceill, "ceill is unportable - "
223 "use gnulib module ceill for portability");
229 # if !@HAVE_COSL@ || !@HAVE_DECL_COSL@
230 _GL_FUNCDECL_SYS (cosl, long double, (long double x));
232 _GL_CXXALIAS_SYS (cosl, long double, (long double x));
233 _GL_CXXALIASWARN (cosl);
234 #elif defined GNULIB_POSIXCHECK
236 # if HAVE_RAW_DECL_COSL
237 _GL_WARN_ON_USE (cosl, "cosl is unportable - "
238 "use gnulib module mathl for portability");
244 # if !@HAVE_EXPL@ || !@HAVE_DECL_EXPL@
245 _GL_FUNCDECL_SYS (expl, long double, (long double x));
247 _GL_CXXALIAS_SYS (expl, long double, (long double x));
248 _GL_CXXALIASWARN (expl);
249 #elif defined GNULIB_POSIXCHECK
251 # if HAVE_RAW_DECL_EXPL
252 _GL_WARN_ON_USE (expl, "expl is unportable - "
253 "use gnulib module mathl for portability");
259 # if @REPLACE_FLOORF@
260 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
261 # define floorf rpl_floorf
263 _GL_FUNCDECL_RPL (floorf, float, (float x));
264 _GL_CXXALIAS_RPL (floorf, float, (float x));
266 # if !@HAVE_DECL_FLOORF@
267 _GL_FUNCDECL_SYS (floorf, float, (float x));
269 _GL_CXXALIAS_SYS (floorf, float, (float x));
271 _GL_CXXALIASWARN (floorf);
272 #elif defined GNULIB_POSIXCHECK
274 # if HAVE_RAW_DECL_FLOORF
275 _GL_WARN_ON_USE (floorf, "floorf is unportable - "
276 "use gnulib module floorf for portability");
282 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
283 # define floor rpl_floor
285 _GL_FUNCDECL_RPL (floor, double, (double x));
286 _GL_CXXALIAS_RPL (floor, double, (double x));
288 _GL_CXXALIAS_SYS (floor, double, (double x));
290 _GL_CXXALIASWARN (floor);
294 # if @REPLACE_FLOORL@
295 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
296 # define floorl rpl_floorl
298 _GL_FUNCDECL_RPL (floorl, long double, (long double x));
299 _GL_CXXALIAS_RPL (floorl, long double, (long double x));
301 # if !@HAVE_DECL_FLOORL@
302 _GL_FUNCDECL_SYS (floorl, long double, (long double x));
304 _GL_CXXALIAS_SYS (floorl, long double, (long double x));
306 _GL_CXXALIASWARN (floorl);
307 #elif defined GNULIB_POSIXCHECK
309 # if HAVE_RAW_DECL_FLOORL
310 _GL_WARN_ON_USE (floorl, "floorl is unportable - "
311 "use gnulib module floorl for portability");
319 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
320 If x is zero: mantissa = x, exp = 0.
321 If x is infinite or NaN: mantissa = x, exp unspecified.
322 Store exp in *EXPPTR and return mantissa. */
323 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
324 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
325 # define frexpl rpl_frexpl
327 _GL_FUNCDECL_RPL (frexpl, long double,
328 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
329 _GL_CXXALIAS_RPL (frexpl, long double, (long double x, int *expptr));
331 # if !@HAVE_DECL_FREXPL@
332 _GL_FUNCDECL_SYS (frexpl, long double,
333 (long double x, int *expptr) _GL_ARG_NONNULL ((2)));
336 _GL_CXXALIAS_SYS (frexpl, long double, (long double x, int *expptr));
339 #if @GNULIB_FREXPL@ && !(@REPLACE_FREXPL@ && !@HAVE_DECL_FREXPL@)
340 _GL_CXXALIASWARN (frexpl);
342 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
344 # if HAVE_RAW_DECL_FREXPL
345 _GL_WARN_ON_USE (frexpl, "frexpl is unportable - "
346 "use gnulib module frexpl for portability");
351 /* Return x * 2^exp. */
352 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
353 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
354 # define ldexpl rpl_ldexpl
356 _GL_FUNCDECL_RPL (ldexpl, long double, (long double x, int exp));
357 _GL_CXXALIAS_RPL (ldexpl, long double, (long double x, int exp));
359 # if !@HAVE_DECL_LDEXPL@
360 _GL_FUNCDECL_SYS (ldexpl, long double, (long double x, int exp));
363 _GL_CXXALIAS_SYS (ldexpl, long double, (long double x, int exp));
367 _GL_CXXALIASWARN (ldexpl);
369 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
371 # if HAVE_RAW_DECL_LDEXPL
372 _GL_WARN_ON_USE (ldexpl, "ldexpl is unportable - "
373 "use gnulib module ldexpl for portability");
379 # if !@HAVE_LOGL@ || !@HAVE_DECL_LOGL@
380 _GL_FUNCDECL_SYS (logl, long double, (long double x));
382 _GL_CXXALIAS_SYS (logl, long double, (long double x));
383 _GL_CXXALIASWARN (logl);
384 #elif defined GNULIB_POSIXCHECK
386 # if HAVE_RAW_DECL_LOGL
387 _GL_WARN_ON_USE (logl, "logl is unportable - "
388 "use gnulib module mathl for portability");
394 # if @REPLACE_ROUNDF@
395 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
397 # define roundf rpl_roundf
399 _GL_FUNCDECL_RPL (roundf, float, (float x));
400 _GL_CXXALIAS_RPL (roundf, float, (float x));
402 # if !@HAVE_DECL_ROUNDF@
403 _GL_FUNCDECL_SYS (roundf, float, (float x));
405 _GL_CXXALIAS_SYS (roundf, float, (float x));
407 _GL_CXXALIASWARN (roundf);
408 #elif defined GNULIB_POSIXCHECK
410 # if HAVE_RAW_DECL_ROUNDF
411 _GL_WARN_ON_USE (roundf, "roundf is unportable - "
412 "use gnulib module roundf for portability");
418 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
420 # define round rpl_round
422 _GL_FUNCDECL_RPL (round, double, (double x));
423 _GL_CXXALIAS_RPL (round, double, (double x));
425 # if !@HAVE_DECL_ROUND@
426 _GL_FUNCDECL_SYS (round, double, (double x));
428 _GL_CXXALIAS_SYS (round, double, (double x));
430 _GL_CXXALIASWARN (round);
431 #elif defined GNULIB_POSIXCHECK
433 # if HAVE_RAW_DECL_ROUND
434 _GL_WARN_ON_USE (round, "round is unportable - "
435 "use gnulib module round for portability");
440 # if @REPLACE_ROUNDL@
441 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
443 # define roundl rpl_roundl
445 _GL_FUNCDECL_RPL (roundl, long double, (long double x));
446 _GL_CXXALIAS_RPL (roundl, long double, (long double x));
448 # if !@HAVE_DECL_ROUNDL@
449 _GL_FUNCDECL_SYS (roundl, long double, (long double x));
451 _GL_CXXALIAS_SYS (roundl, long double, (long double x));
453 _GL_CXXALIASWARN (roundl);
454 #elif defined GNULIB_POSIXCHECK
456 # if HAVE_RAW_DECL_ROUNDL
457 _GL_WARN_ON_USE (roundl, "roundl is unportable - "
458 "use gnulib module roundl for portability");
464 # if !@HAVE_SINL@ || !@HAVE_DECL_SINL@
465 _GL_FUNCDECL_SYS (sinl, long double, (long double x));
467 _GL_CXXALIAS_SYS (sinl, long double, (long double x));
468 _GL_CXXALIASWARN (sinl);
469 #elif defined GNULIB_POSIXCHECK
471 # if HAVE_RAW_DECL_SINL
472 _GL_WARN_ON_USE (sinl, "sinl is unportable - "
473 "use gnulib module mathl for portability");
479 # if !@HAVE_SQRTL@ || !@HAVE_DECL_SQRTL@
480 _GL_FUNCDECL_SYS (sqrtl, long double, (long double x));
482 _GL_CXXALIAS_SYS (sqrtl, long double, (long double x));
483 _GL_CXXALIASWARN (sqrtl);
484 #elif defined GNULIB_POSIXCHECK
486 # if HAVE_RAW_DECL_SQRTL
487 _GL_WARN_ON_USE (sqrtl, "sqrtl is unportable - "
488 "use gnulib module mathl for portability");
494 # if !@HAVE_TANL@ || !@HAVE_DECL_TANL@
495 _GL_FUNCDECL_SYS (tanl, long double, (long double x));
497 _GL_CXXALIAS_SYS (tanl, long double, (long double x));
498 _GL_CXXALIASWARN (tanl);
499 #elif defined GNULIB_POSIXCHECK
501 # if HAVE_RAW_DECL_TANL
502 _GL_WARN_ON_USE (tanl, "tanl is unportable - "
503 "use gnulib module mathl for portability");
509 # if @REPLACE_TRUNCF@
510 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
511 # define truncf rpl_truncf
513 _GL_FUNCDECL_RPL (truncf, float, (float x));
514 _GL_CXXALIAS_RPL (truncf, float, (float x));
516 # if !@HAVE_DECL_TRUNCF@
517 _GL_FUNCDECL_SYS (truncf, float, (float x));
519 _GL_CXXALIAS_SYS (truncf, float, (float x));
521 _GL_CXXALIASWARN (truncf);
522 #elif defined GNULIB_POSIXCHECK
524 # if HAVE_RAW_DECL_TRUNCF
525 _GL_WARN_ON_USE (truncf, "truncf is unportable - "
526 "use gnulib module truncf for portability");
531 # if !@HAVE_DECL_TRUNC@
532 _GL_FUNCDECL_SYS (trunc, double, (double x));
534 _GL_CXXALIAS_SYS (trunc, double, (double x));
535 _GL_CXXALIASWARN (trunc);
536 #elif defined GNULIB_POSIXCHECK
538 # if HAVE_RAW_DECL_TRUNC
539 _GL_WARN_ON_USE (trunc, "trunc is unportable - "
540 "use gnulib module trunc for portability");
545 # if @REPLACE_TRUNCL@
546 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
548 # define truncl rpl_truncl
550 _GL_FUNCDECL_RPL (truncl, long double, (long double x));
551 _GL_CXXALIAS_RPL (truncl, long double, (long double x));
553 # if !@HAVE_DECL_TRUNCL@
554 _GL_FUNCDECL_SYS (truncl, long double, (long double x));
556 _GL_CXXALIAS_SYS (truncl, long double, (long double x));
558 _GL_CXXALIASWARN (truncl);
559 #elif defined GNULIB_POSIXCHECK
561 # if HAVE_RAW_DECL_TRUNCL
562 _GL_WARN_ON_USE (truncl, "truncl is unportable - "
563 "use gnulib module truncl for portability");
568 #if @GNULIB_ISFINITE@
569 # if @REPLACE_ISFINITE@
570 _GL_EXTERN_C int gl_isfinitef (float x);
571 _GL_EXTERN_C int gl_isfinited (double x);
572 _GL_EXTERN_C int gl_isfinitel (long double x);
574 # define isfinite(x) \
575 (sizeof (x) == sizeof (long double) ? gl_isfinitel (x) : \
576 sizeof (x) == sizeof (double) ? gl_isfinited (x) : \
579 #elif defined GNULIB_POSIXCHECK
580 # if defined isfinite
581 _GL_WARN_REAL_FLOATING_DECL (isfinite);
583 # define isfinite(x) _GL_WARN_REAL_FLOATING_IMPL (isfinite, x)
590 _GL_EXTERN_C int gl_isinff (float x);
591 _GL_EXTERN_C int gl_isinfd (double x);
592 _GL_EXTERN_C int gl_isinfl (long double x);
595 (sizeof (x) == sizeof (long double) ? gl_isinfl (x) : \
596 sizeof (x) == sizeof (double) ? gl_isinfd (x) : \
599 #elif defined GNULIB_POSIXCHECK
601 _GL_WARN_REAL_FLOATING_DECL (isinf);
603 # define isinf(x) _GL_WARN_REAL_FLOATING_IMPL (isinf, x)
609 /* Test for NaN for 'float' numbers. */
611 /* The original <math.h> included above provides a declaration of isnan macro
612 or (older) isnanf function. */
614 /* GCC 4.0 and newer provides three built-ins for isnan. */
616 # define isnanf(x) __builtin_isnanf ((float)(x))
619 # define isnanf(x) isnan ((float)(x))
622 /* Test whether X is a NaN. */
624 # define isnanf rpl_isnanf
625 _GL_EXTERN_C int isnanf (float x);
630 /* Test for NaN for 'double' numbers.
631 This function is a gnulib extension, unlike isnan() which applied only
632 to 'double' numbers earlier but now is a type-generic macro. */
634 /* The original <math.h> included above provides a declaration of isnan
637 /* GCC 4.0 and newer provides three built-ins for isnan. */
639 # define isnand(x) __builtin_isnan ((double)(x))
642 # define isnand(x) isnan ((double)(x))
645 /* Test whether X is a NaN. */
647 # define isnand rpl_isnand
648 _GL_EXTERN_C int isnand (double x);
653 /* Test for NaN for 'long double' numbers. */
655 /* The original <math.h> included above provides a declaration of isnan
656 macro or (older) isnanl function. */
658 /* GCC 4.0 and newer provides three built-ins for isnan. */
660 # define isnanl(x) __builtin_isnanl ((long double)(x))
663 # define isnanl(x) isnan ((long double)(x))
666 /* Test whether X is a NaN. */
668 # define isnanl rpl_isnanl
669 _GL_EXTERN_C int isnanl (long double x);
673 /* This must come *after* the snippets for GNULIB_ISNANF and GNULIB_ISNANL! */
676 /* We can't just use the isnanf macro (e.g.) as exposed by
677 isnanf.h (e.g.) here, because those may end up being macros
678 that recursively expand back to isnan. So use the gnulib
679 replacements for them directly. */
680 # if @HAVE_ISNANF@ && __GNUC__ >= 4
681 # define gl_isnan_f(x) __builtin_isnan ((float)(x))
683 _GL_EXTERN_C int rpl_isnanf (float x);
684 # define gl_isnan_f(x) rpl_isnanf (x)
686 # if @HAVE_ISNAND@ && __GNUC__ >= 4
687 # define gl_isnan_d(x) __builtin_isnan ((double)(x))
689 _GL_EXTERN_C int rpl_isnand (double x);
690 # define gl_isnan_d(x) rpl_isnand (x)
692 # if @HAVE_ISNANL@ && __GNUC__ >= 4
693 # define gl_isnan_l(x) __builtin_isnan ((long double)(x))
695 _GL_EXTERN_C int rpl_isnanl (long double x);
696 # define gl_isnan_l(x) rpl_isnanl (x)
700 (sizeof (x) == sizeof (long double) ? gl_isnan_l (x) : \
701 sizeof (x) == sizeof (double) ? gl_isnan_d (x) : \
704 /* Ensure isnan is a macro. */
708 #elif defined GNULIB_POSIXCHECK
710 _GL_WARN_REAL_FLOATING_DECL (isnan);
712 # define isnan(x) _GL_WARN_REAL_FLOATING_IMPL (isnan, x)
718 # if @REPLACE_SIGNBIT_USING_GCC@
720 /* GCC 4.0 and newer provides three built-ins for signbit. */
721 # define signbit(x) \
722 (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
723 sizeof (x) == sizeof (double) ? __builtin_signbit (x) : \
724 __builtin_signbitf (x))
726 # if @REPLACE_SIGNBIT@
728 _GL_EXTERN_C int gl_signbitf (float arg);
729 _GL_EXTERN_C int gl_signbitd (double arg);
730 _GL_EXTERN_C int gl_signbitl (long double arg);
731 # if __GNUC__ >= 2 && !__STRICT_ANSI__
732 # define _GL_NUM_UINT_WORDS(type) \
733 ((sizeof (type) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
734 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT && !defined gl_signbitf
735 # define gl_signbitf_OPTIMIZED_MACRO
736 # define gl_signbitf(arg) \
737 ({ union { float _value; \
738 unsigned int _word[_GL_NUM_UINT_WORDS (float)]; \
741 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
744 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT && !defined gl_signbitd
745 # define gl_signbitd_OPTIMIZED_MACRO
746 # define gl_signbitd(arg) \
747 ({ union { double _value; \
748 unsigned int _word[_GL_NUM_UINT_WORDS (double)]; \
751 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
754 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT && !defined gl_signbitl
755 # define gl_signbitl_OPTIMIZED_MACRO
756 # define gl_signbitl(arg) \
757 ({ union { long double _value; \
758 unsigned int _word[_GL_NUM_UINT_WORDS (long double)]; \
761 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
765 # define signbit(x) \
766 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
767 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
770 #elif defined GNULIB_POSIXCHECK
772 _GL_WARN_REAL_FLOATING_DECL (signbit);
774 # define signbit(x) _GL_WARN_REAL_FLOATING_IMPL (signbit, x)
779 #endif /* _GL_MATH_H */
780 #endif /* _GL_MATH_H */