mirror of https://github.com/macssh/macssh.git
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
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/* mpfr_set_f -- set a MPFR number from a GNU MPF number
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Copyright (C) 1999-2000 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 "longlong.h"
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#include "mpfr.h"
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void
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#if __STDC__
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mpfr_set_f(mpfr_ptr y, mpf_srcptr x, char rnd_mode)
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#else
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mpfr_set_f(y, x, rnd_mode)
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mpfr_ptr y;
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mpf_srcptr x;
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char rnd_mode;
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#endif
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{
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mp_limb_t *my, *mx, *tmp; unsigned long cnt, sx, sy;
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TMP_DECL(marker);
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sx = ABS(SIZ(x)); sy = ABSSIZE(y);
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my = MANT(y); mx = MANT(x);
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if (sx==0) { /* x is zero */
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SET_ZERO(y); return;
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}
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count_leading_zeros(cnt, mx[sx - 1]);
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if (SIZ(x)*SIGN(y)<0) CHANGE_SIGN(y);
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if (sy < sx)
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{
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unsigned long xprec = sx * BITS_PER_MP_LIMB;
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tmp = (mp_limb_t*) TMP_ALLOC(xprec);
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if (cnt) mpn_lshift(tmp, mx, sx, cnt);
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else MPN_COPY(tmp, mx, sx);
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mpfr_round_raw(my, tmp, xprec, (SIZ(x)<0), PREC(y), rnd_mode);
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}
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else
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{
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if (cnt) mpn_lshift(my + sy - sx, mx, sx, cnt);
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else MPN_COPY(my + sy - sx, mx, sy);
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MPN_ZERO(my, sy - sx);
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/* no rounding necessary, since y has a larger mantissa */
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}
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EXP(y) = EXP(x) * BITS_PER_MP_LIMB - cnt;
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TMP_FREE(marker);
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}
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