mirror of https://github.com/macssh/macssh.git
54 lines
1.7 KiB
C
Executable File
54 lines
1.7 KiB
C
Executable File
/* mpfr_set -- copy of a floating-point number
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Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
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This file is part of the MPFR Library.
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The MPFR Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The MPFR 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 Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the MPFR Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <stdio.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "mpfr.h"
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void
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#if __STDC__
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mpfr_set4(mpfr_ptr a, mpfr_srcptr b, unsigned char rnd_mode, int signb)
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#else
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mpfr_set4(a, b, rnd_mode, signb)
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mpfr_ptr a;
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mpfr_srcptr b;
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unsigned char rnd_mode;
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int signb;
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#endif
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{
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int carry, an, preca = PREC(a), sh; mp_limb_t *ap = MANT(a);
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carry = mpfr_round_raw(ap, MANT(b), PREC(b), (signb<0), preca, rnd_mode);
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EXP(a) = EXP(b);
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if (carry) {
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an = (preca-1)/BITS_PER_MP_LIMB + 1;
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sh = an * BITS_PER_MP_LIMB - preca;
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if ((*ap >> sh) & 1) {
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fprintf(stderr, "unable to round in mpfr_set\n"); exit(1);
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}
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mpn_rshift(ap, ap, an, 1);
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ap[an-1] |= (mp_limb_t) 1 << (BITS_PER_MP_LIMB-1);
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EXP(a)++;
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}
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if (SIGN(a) != signb) CHANGE_SIGN(a);
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}
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