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Annotation of OpenXM_contrib/gmp/mpfr/set.c, Revision 1.1.1.1

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: }