Annotation of OpenXM_contrib/gmp/mpfr/copysign.c, Revision 1.1.1.1
1.1 ohara 1: /* mpfr_copysign -- Produce a value with the magnitude of x and sign of y
2:
3: Copyright 2001, 2002 Free Software Foundation.
4:
5: This file is part of the MPFR Library.
6:
7: The MPFR Library is free software; you can redistribute it and/or modify
8: it under the terms of the GNU Lesser General Public License as published by
9: the Free Software Foundation; either version 2.1 of the License, or (at your
10: option) any later version.
11:
12: The MPFR Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15: License for more details.
16:
17: You should have received a copy of the GNU Lesser General Public License
18: along with the MPFR Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
22: #include "gmp.h"
23: #include "gmp-impl.h"
24: #include "mpfr.h"
25: #include "mpfr-impl.h"
26:
27: /* The computation of z with magnitude of x and sign of y
28:
29: z = sign(y) * abs(x)
30: */
31:
32: int
33: mpfr_copysign (mpfr_ptr z, mpfr_srcptr x ,mpfr_srcptr y , mp_rnd_t rnd_mode)
34: {
35: if (MPFR_IS_NAN(y))
36: {
37: MPFR_SET_NAN(z);
38: MPFR_RET_NAN;
39: }
40: else
41: return mpfr_set4(z, x, rnd_mode, MPFR_SIGN(y));
42: }
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