iset_ui.c
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上传日期:2022-08-06
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- /* mpf_init_set_ui() -- Initialize a float and assign it from an unsigned int.
- Copyright 1993, 1994, 1995, 2000, 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 "gmp.h"
- #include "gmp-impl.h"
- void
- mpf_init_set_ui (mpf_ptr r, unsigned long int val)
- {
- mp_size_t prec = __gmp_default_fp_limb_precision;
- mp_size_t size;
- r->_mp_prec = prec;
- r->_mp_d = (mp_ptr) (*__gmp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);
- r->_mp_d[0] = val & GMP_NUMB_MASK;
- size = (val != 0);
- #if BITS_PER_ULONG > GMP_NUMB_BITS
- val >>= GMP_NUMB_BITS;
- r->_mp_d[1] = val;
- size += (val != 0);
- #endif
- r->_mp_size = size;
- r->_mp_exp = size;
- }