50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
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/* mpf_init_set_si() -- Initialize a float and assign it from a signed int.
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Copyright 1993, 1994, 1995, 2000, 2001, 2003, 2004 Free Software Foundation,
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Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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void
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mpf_init_set_si (mpf_ptr r, long int val)
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{
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mp_size_t prec = __gmp_default_fp_limb_precision;
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mp_size_t size;
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mp_limb_t vl;
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r->_mp_prec = prec;
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r->_mp_d = (mp_ptr) (*__gmp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);
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vl = (mp_limb_t) (unsigned long int) (val >= 0 ? val : -val);
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r->_mp_d[0] = vl & GMP_NUMB_MASK;
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size = vl != 0;
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#if BITS_PER_ULONG > GMP_NUMB_BITS
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vl >>= GMP_NUMB_BITS;
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r->_mp_d[1] = vl;
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size += (vl != 0);
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#endif
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r->_mp_exp = size;
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r->_mp_size = val >= 0 ? size : -size;
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}
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