51c586b89d
GNU MP is a library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating point numbers. It has a rich set of functions, and the functions have a regular interface. GMP is necessary for GCC >= 4.2.
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/* mpf_init_set -- Initialize a float and assign it from another float.
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Copyright 1993, 1994, 1995, 2000, 2001, 2004 Free Software Foundation, 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 3 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. If not, see http://www.gnu.org/licenses/. */
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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 (mpf_ptr r, mpf_srcptr s)
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{
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mp_ptr rp, sp;
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mp_size_t ssize, size;
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mp_size_t prec;
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prec = __gmp_default_fp_limb_precision;
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r->_mp_d = (mp_ptr) (*__gmp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);
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r->_mp_prec = prec;
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prec++; /* lie not to lose precision in assignment */
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ssize = s->_mp_size;
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size = ABS (ssize);
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rp = r->_mp_d;
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sp = s->_mp_d;
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if (size > prec)
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{
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sp += size - prec;
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size = prec;
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}
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r->_mp_exp = s->_mp_exp;
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r->_mp_size = ssize >= 0 ? size : -size;
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MPN_COPY (rp, sp, size);
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}
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