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Annotation of OpenXM_contrib/gmp/mpfr/set.c, Revision 1.1

1.1     ! maekawa     1: /* mpfr_set -- copy of a floating-point number
        !             2:
        !             3: Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
        !             4:
        !             5: This file is part of the MPFR Library.
        !             6:
        !             7: The MPFR Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The MPFR Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            18: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include <stdio.h>
        !            23: #include "gmp.h"
        !            24: #include "gmp-impl.h"
        !            25: #include "mpfr.h"
        !            26:
        !            27: void
        !            28: #if __STDC__
        !            29: mpfr_set4(mpfr_ptr a, mpfr_srcptr b, unsigned char rnd_mode, int signb)
        !            30: #else
        !            31: mpfr_set4(a, b, rnd_mode, signb)
        !            32:      mpfr_ptr a;
        !            33:      mpfr_srcptr b;
        !            34:      unsigned char rnd_mode;
        !            35:      int signb;
        !            36: #endif
        !            37: {
        !            38:   int carry, an, preca = PREC(a), sh; mp_limb_t *ap = MANT(a);
        !            39:
        !            40:   carry = mpfr_round_raw(ap, MANT(b), PREC(b), (signb<0), preca, rnd_mode);
        !            41:   EXP(a) = EXP(b);
        !            42:   if (carry) {
        !            43:     an = (preca-1)/BITS_PER_MP_LIMB + 1;
        !            44:     sh = an * BITS_PER_MP_LIMB - preca;
        !            45:     if ((*ap >> sh) & 1) {
        !            46:       fprintf(stderr, "unable to round in mpfr_set\n"); exit(1);
        !            47:     }
        !            48:     mpn_rshift(ap, ap, an, 1);
        !            49:     ap[an-1] |= (mp_limb_t) 1 << (BITS_PER_MP_LIMB-1);
        !            50:     EXP(a)++;
        !            51:   }
        !            52:   if (SIGN(a) != signb) CHANGE_SIGN(a);
        !            53: }