=================================================================== RCS file: /home/cvs/OpenXM_contrib/gmp/mpfr/Attic/set_f.c,v retrieving revision 1.1 retrieving revision 1.1.1.2 diff -u -p -r1.1 -r1.1.1.2 --- OpenXM_contrib/gmp/mpfr/Attic/set_f.c 2000/09/09 14:12:19 1.1 +++ OpenXM_contrib/gmp/mpfr/Attic/set_f.c 2003/08/25 16:06:07 1.1.1.2 @@ -1,20 +1,20 @@ /* mpfr_set_f -- set a MPFR number from a GNU MPF number -Copyright (C) 1999-2000 PolKA project, Inria Lorraine and Loria +Copyright 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of the MPFR Library. The MPFR Library is free software; you can redistribute it and/or modify -it under the terms of the GNU Library General Public License as published by -the Free Software Foundation; either version 2 of the License, or (at your +it under the terms of the GNU Lesser General Public License as published by +the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The MPFR Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. -You should have received a copy of the GNU Library General Public License +You should have received a copy of the GNU Lesser General Public License along with the MPFR Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ @@ -24,49 +24,60 @@ MA 02111-1307, USA. */ #include "gmp-impl.h" #include "longlong.h" #include "mpfr.h" +#include "mpfr-impl.h" -void -#if __STDC__ -mpfr_set_f(mpfr_ptr y, mpf_srcptr x, char rnd_mode) -#else -mpfr_set_f(y, x, rnd_mode) - mpfr_ptr y; - mpf_srcptr x; - char rnd_mode; -#endif +int +mpfr_set_f (mpfr_ptr y, mpf_srcptr x, mp_rnd_t rnd_mode) { - mp_limb_t *my, *mx, *tmp; unsigned long cnt, sx, sy; + mp_limb_t *my, *mx, *tmp; + unsigned long cnt, sx, sy; + int inexact; TMP_DECL(marker); - sx = ABS(SIZ(x)); sy = ABSSIZE(y); - my = MANT(y); mx = MANT(x); + if (SIZ(x) * MPFR_SIGN(y) < 0) + MPFR_CHANGE_SIGN (y); - if (sx==0) { /* x is zero */ - SET_ZERO(y); return; - } + MPFR_CLEAR_FLAGS (y); - count_leading_zeros(cnt, mx[sx - 1]); + sx = ABS(SIZ(x)); /* number of limbs of the mantissa of x */ + sy = 1 + (MPFR_PREC(y) - 1) / BITS_PER_MP_LIMB; + my = MPFR_MANT(y); + mx = PTR(x); - if (SIZ(x)*SIGN(y)<0) CHANGE_SIGN(y); + if (sx == 0) /* x is zero */ + { + MPFR_SET_ZERO(y); + return 0; /* 0 is exact */ + } - if (sy < sx) + count_leading_zeros(cnt, mx[sx - 1]); + + if (sy <= sx) /* we may have to round even when sy = sx */ { unsigned long xprec = sx * BITS_PER_MP_LIMB; + TMP_MARK(marker); tmp = (mp_limb_t*) TMP_ALLOC(xprec); - if (cnt) mpn_lshift(tmp, mx, sx, cnt); - else MPN_COPY(tmp, mx, sx); - mpfr_round_raw(my, tmp, xprec, (SIZ(x)<0), PREC(y), rnd_mode); + if (cnt) + mpn_lshift(tmp, mx, sx, cnt); + else + MPN_COPY(tmp, mx, sx); + mpfr_round_raw (my, tmp, xprec, (SIZ(x)<0), MPFR_PREC(y), rnd_mode, + &inexact); + TMP_FREE(marker); } else { - if (cnt) mpn_lshift(my + sy - sx, mx, sx, cnt); - else MPN_COPY(my + sy - sx, mx, sy); + if (cnt) + mpn_lshift(my + sy - sx, mx, sx, cnt); + else + MPN_COPY(my + sy - sx, mx, sy); MPN_ZERO(my, sy - sx); /* no rounding necessary, since y has a larger mantissa */ + inexact = 0; } - EXP(y) = EXP(x) * BITS_PER_MP_LIMB - cnt; + MPFR_EXP(y) = EXP(x) * BITS_PER_MP_LIMB - cnt; - TMP_FREE(marker); + return inexact; }