1 /* mpfr_set -- copy of a floating-point number
3 Copyright 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramel projects, INRIA.
6 This file is part of the GNU MPFR Library.
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
13 The GNU MPFR Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
23 #include "mpfr-impl.h"
25 /* set a to abs(b) * signb: a=b when signb = SIGN(b), a=abs(b) when signb=1 */
27 mpfr_set4 (mpfr_ptr a
, mpfr_srcptr b
, mpfr_rnd_t rnd_mode
, int signb
)
29 /* Sign is ALWAYS copied */
30 MPFR_SET_SIGN (a
, signb
);
32 /* Exponent is also always copied since if the number is singular,
33 the exponent field determined the number.
34 Can't use MPFR_SET_EXP since the exponent may be singular */
35 MPFR_EXP (a
) = MPFR_EXP (b
);
37 if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (b
)))
39 /* MPFR_SET_NAN, MPFR_SET_ZERO and MPFR_SET_INF are useless
40 since MPFR_EXP (a) = MPFR_EXP (b) does the job */
46 else if (MPFR_LIKELY (MPFR_PREC (b
) == MPFR_PREC (a
)))
48 /* Same precision and b is not singular:
49 * just copy the mantissa, and set the exponent and the sign
50 * The result is exact. */
51 MPN_COPY (MPFR_MANT (a
), MPFR_MANT (b
), MPFR_LIMB_SIZE (b
));
58 /* Else Round B inside a */
59 MPFR_RNDRAW (inex
, a
, MPFR_MANT (b
), MPFR_PREC (b
), rnd_mode
, signb
,
60 if (MPFR_UNLIKELY ( ++MPFR_EXP (a
) > __gmpfr_emax
))
61 return mpfr_overflow (a
, rnd_mode
, signb
) );
69 mpfr_set (mpfr_ptr a
, mpfr_srcptr b
, mpfr_rnd_t rnd_mode
)
71 return mpfr_set4 (a
, b
, rnd_mode
, MPFR_SIGN (b
));
77 mpfr_abs (mpfr_ptr a
, mpfr_srcptr b
, mpfr_rnd_t rnd_mode
)
79 return mpfr_set4 (a
, b
, rnd_mode
, MPFR_SIGN_POS
);