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