set_d.c
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上传日期:2022-08-06
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- /* mpf_set_d -- Assign a float from a double.
- Copyright 1993, 1994, 1995, 1996, 2001, 2003, 2004 Free Software Foundation,
- Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include "config.h"
- #if HAVE_FLOAT_H
- #include <float.h> /* for DBL_MAX */
- #endif
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpf_set_d (mpf_ptr r, double d)
- {
- int negative;
- DOUBLE_NAN_INF_ACTION (d,
- __gmp_invalid_operation (),
- __gmp_invalid_operation ());
- if (UNLIKELY (d == 0))
- {
- SIZ(r) = 0;
- EXP(r) = 0;
- return;
- }
- negative = d < 0;
- d = ABS (d);
- SIZ(r) = negative ? -LIMBS_PER_DOUBLE : LIMBS_PER_DOUBLE;
- EXP(r) = __gmp_extract_double (PTR(r), d);
- }