1 /* A GNU-like <math.h>.
3 Copyright (C) 2002-2003, 2007 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 2, or (at your option)
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, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
21 /* The include_next requires a split double-inclusion guard. */
22 #if @HAVE_INCLUDE_NEXT@
23 # include_next <math.h>
25 # include @ABSOLUTE_MATH_H@
32 /* The definition of GL_LINK_WARNING is copied here. */
43 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
44 If x is zero: mantissa = x, exp = 0.
45 If x is infinite or NaN: mantissa = x, exp unspecified.
46 Store exp and return mantissa. */
49 # define frexp rpl_frexp
50 extern double frexp (double x, int *exp);
52 #elif defined GNULIB_POSIXCHECK
55 (GL_LINK_WARNING ("frexp is unportable - " \
56 "use gnulib module frexp for portability"), \
61 #if @GNULIB_MATHL@ || !@HAVE_DECL_ACOSL@
62 extern long double acosl (long double x);
64 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
67 (GL_LINK_WARNING ("acosl is unportable - " \
68 "use gnulib module mathl for portability"), \
72 #if @GNULIB_MATHL@ || !@HAVE_DECL_ASINL@
73 extern long double asinl (long double x);
75 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
78 (GL_LINK_WARNING ("asinl is unportable - " \
79 "use gnulib module mathl for portability"), \
83 #if @GNULIB_MATHL@ || !@HAVE_DECL_ATANL@
84 extern long double atanl (long double x);
86 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
89 (GL_LINK_WARNING ("atanl is unportable - " \
90 "use gnulib module mathl for portability"), \
94 #if @GNULIB_MATHL@ || !@HAVE_DECL_CEILL@
95 extern long double ceill (long double x);
97 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
100 (GL_LINK_WARNING ("ceill is unportable - " \
101 "use gnulib module mathl for portability"), \
105 #if @GNULIB_MATHL@ || !@HAVE_DECL_COSL@
106 extern long double cosl (long double x);
108 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
111 (GL_LINK_WARNING ("cosl is unportable - " \
112 "use gnulib module mathl for portability"), \
116 #if @GNULIB_MATHL@ || !@HAVE_DECL_EXPL@
117 extern long double expl (long double x);
119 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
122 (GL_LINK_WARNING ("expl is unportable - " \
123 "use gnulib module mathl for portability"), \
127 #if @GNULIB_MATHL@ || !@HAVE_DECL_FLOORL@
128 extern long double floorl (long double x);
130 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
133 (GL_LINK_WARNING ("floorl is unportable - " \
134 "use gnulib module mathl for portability"), \
141 If x finite and nonzero: 0.5 <= |mantissa| < 1.0.
142 If x is zero: mantissa = x, exp = 0.
143 If x is infinite or NaN: mantissa = x, exp unspecified.
144 Store exp and return mantissa. */
145 #if @GNULIB_FREXPL@ && @REPLACE_FREXPL@
146 # define frexpl rpl_frexpl
148 #if (@GNULIB_FREXPL@ && @REPLACE_FREXPL@) || !@HAVE_DECL_FREXPL@
149 extern long double frexpl (long double x, int *exp);
151 #if !@GNULIB_FREXPL@ && defined GNULIB_POSIXCHECK
153 # define frexpl(x,e) \
154 (GL_LINK_WARNING ("frexpl is unportable - " \
155 "use gnulib module frexpl for portability"), \
159 /* Return x * 2^exp. */
160 #if @GNULIB_LDEXPL@ && @REPLACE_LDEXPL@
161 # define ldexpl rpl_ldexpl
163 #if (@GNULIB_LDEXPL@ && @REPLACE_LDEXPL@) || !@HAVE_DECL_LDEXPL@
164 extern long double ldexpl (long double x, int exp);
166 #if !@GNULIB_LDEXPL@ && defined GNULIB_POSIXCHECK
168 # define ldexpl(x,e) \
169 (GL_LINK_WARNING ("ldexpl is unportable - " \
170 "use gnulib module ldexpl for portability"), \
174 #if @GNULIB_MATHL@ || !@HAVE_DECL_LOGL@
175 extern long double logl (long double x);
177 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
180 (GL_LINK_WARNING ("logl is unportable - " \
181 "use gnulib module mathl for portability"), \
185 #if @GNULIB_MATHL@ || !@HAVE_DECL_SINL@
186 extern long double sinl (long double x);
188 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
191 (GL_LINK_WARNING ("sinl is unportable - " \
192 "use gnulib module mathl for portability"), \
196 #if @GNULIB_MATHL@ || !@HAVE_DECL_SQRTL@
197 extern long double sqrtl (long double x);
199 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
202 (GL_LINK_WARNING ("sqrtl is unportable - " \
203 "use gnulib module mathl for portability"), \
207 #if @GNULIB_MATHL@ || !@HAVE_DECL_TANL@
208 extern long double tanl (long double x);
210 #if !@GNULIB_MATHL@ && defined GNULIB_POSIXCHECK
213 (GL_LINK_WARNING ("tanl is unportable - " \
214 "use gnulib module mathl for portability"), \
220 # if @REPLACE_SIGNBIT@
222 extern int gl_signbitf (float arg);
223 extern int gl_signbitd (double arg);
224 extern int gl_signbitl (long double arg);
225 # if __GNUC__ >= 2 && !__STRICT_ANSI__
226 # if defined FLT_SIGNBIT_WORD && defined FLT_SIGNBIT_BIT
227 # define gl_signbitf(arg) \
228 ({ union { float _value; \
229 unsigned int _word[(sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int)]; \
232 (_m._word[FLT_SIGNBIT_WORD] >> FLT_SIGNBIT_BIT) & 1; \
235 # if defined DBL_SIGNBIT_WORD && defined DBL_SIGNBIT_BIT
236 # define gl_signbitd(arg) \
237 ({ union { double _value; \
238 unsigned int _word[(sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)]; \
241 (_m._word[DBL_SIGNBIT_WORD] >> DBL_SIGNBIT_BIT) & 1; \
244 # if defined LDBL_SIGNBIT_WORD && defined LDBL_SIGNBIT_BIT
245 # define gl_signbitl(arg) \
246 ({ union { long double _value; \
247 unsigned int _word[(sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)]; \
250 (_m._word[LDBL_SIGNBIT_WORD] >> LDBL_SIGNBIT_BIT) & 1; \
254 # define signbit(x) \
255 (sizeof (x) == sizeof (long double) ? gl_signbitl (x) : \
256 sizeof (x) == sizeof (double) ? gl_signbitd (x) : \
259 #elif defined GNULIB_POSIXCHECK
260 /* How to override a macro? */
268 #endif /* _GL_MATH_H */
269 #endif /* _GL_MATH_H */