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:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>