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

1.1       maekawa     1: /* mpfr_set_si, mpfr_set_ui -- set a MPFR number from a machine integer
                      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 "longlong.h"
                     26: #include "mpfr.h"
                     27:
                     28: void
                     29: #if __STDC__
                     30: mpfr_set_si(mpfr_ptr x, long i, unsigned char rnd_mode)
                     31: #else
                     32: mpfr_set_si(x, i, rnd_mode)
                     33:      mpfr_ptr x;
                     34:      long i;
                     35:      unsigned char rnd_mode;
                     36: #endif
                     37: {
                     38:   unsigned long xn, cnt; mp_limb_t ai;
                     39:
                     40:   if (i==0) { SET_ZERO(x); return; }
                     41:   xn = (PREC(x)-1)/BITS_PER_MP_LIMB;
                     42:   ai = ABS(i);
                     43:
                     44:   count_leading_zeros(cnt, ai);
                     45:
                     46:   x -> _mp_d[xn] = ai << cnt;
                     47:   /* don't forget to put zero in lower limbs */
                     48:   MPN_ZERO(MANT(x), xn);
                     49:   x -> _mp_exp = BITS_PER_MP_LIMB - cnt;
                     50:   /* warning: don't change the precision of x! */
                     51:   if (i*SIGN(x) < 0) CHANGE_SIGN(x);
                     52:
                     53:   return;
                     54: }
                     55:
                     56: void
                     57: #if __STDC__
                     58: mpfr_set_ui(mpfr_ptr x, unsigned long i, unsigned char rnd_mode)
                     59: #else
                     60: mpfr_set_ui(x, i, rnd_mode)
                     61:      mpfr_ptr x;
                     62:      long i;
                     63:      unsigned char rnd_mode;
                     64: #endif
                     65: {
                     66:   unsigned int xn, cnt;
                     67:
                     68:   if (i==0) { SET_ZERO(x); return; }
                     69:   xn = (PREC(x)-1)/BITS_PER_MP_LIMB;
                     70:   count_leading_zeros(cnt, (mp_limb_t) i);
                     71:
                     72:   x -> _mp_d[xn] = ((mp_limb_t) i) << cnt;
                     73:   /* don't forget to put zero in lower limbs */
                     74:   MPN_ZERO(MANT(x), xn);
                     75:   x -> _mp_exp = BITS_PER_MP_LIMB - cnt;
                     76:   /* warning: don't change the precision of x! */
                     77:   if (SIGN(x) < 0) CHANGE_SIGN(x);
                     78:
                     79:   return;
                     80: }
                     81: