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Annotation of OpenXM_contrib/gmp/mpfr/set.c, Revision 1.1.1.2

1.1       maekawa     1: /* mpfr_set -- copy of a floating-point number
                      2:
1.1.1.2 ! ohara       3: Copyright 1999, 2001 Free Software Foundation.
1.1       maekawa     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
1.1.1.2 ! ohara       8: it under the terms of the GNU Lesser General Public License as published by
        !             9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! ohara      14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    15: License for more details.
                     16:
1.1.1.2 ! ohara      17: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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 "gmp.h"
                     23: #include "gmp-impl.h"
                     24: #include "mpfr.h"
1.1.1.2 ! ohara      25: #include "mpfr-impl.h"
1.1       maekawa    26:
1.1.1.2 ! ohara      27: /* set a to abs(b) * signb: a=b when signb = SIGN(b), a=abs(b) when signb=1 */
        !            28: int
        !            29: mpfr_set4 (mpfr_ptr a, mpfr_srcptr b, mp_rnd_t rnd_mode, int signb)
1.1       maekawa    30: {
1.1.1.2 ! ohara      31:   int inex;
1.1       maekawa    32:
1.1.1.2 ! ohara      33:   if (MPFR_IS_NAN(b))
        !            34:     {
        !            35:       MPFR_CLEAR_FLAGS(a);
        !            36:       MPFR_SET_NAN(a);
        !            37:       MPFR_RET_NAN;
1.1       maekawa    38:     }
1.1.1.2 ! ohara      39:
        !            40:   if (MPFR_IS_INF(b))
        !            41:     {
        !            42:       MPFR_CLEAR_FLAGS(a);
        !            43:       MPFR_SET_INF(a);
        !            44:       inex = 0;
        !            45:     }
        !            46:   else
        !            47:     {
        !            48:       mp_limb_t *ap;
        !            49:       mp_prec_t aq;
        !            50:       int carry;
        !            51:
        !            52:       MPFR_CLEAR_FLAGS(a);
        !            53:
        !            54:       ap = MPFR_MANT(a);
        !            55:       aq = MPFR_PREC(a);
        !            56:
        !            57:       carry = mpfr_round_raw(ap, MPFR_MANT(b), MPFR_PREC(b), (signb < 0),
        !            58:                              aq, rnd_mode, &inex);
        !            59:       MPFR_EXP(a) = MPFR_EXP(b);
        !            60:
        !            61:       if (carry)
        !            62:         {
        !            63:           mp_exp_t exp = MPFR_EXP(a);
        !            64:
        !            65:           if (exp == __mpfr_emax)
        !            66:             return mpfr_set_overflow(a, rnd_mode, signb);
        !            67:
        !            68:           MPFR_EXP(a)++;
        !            69:           ap[(MPFR_PREC(a)-1)/BITS_PER_MP_LIMB] = GMP_LIMB_HIGHBIT;
        !            70:         }
        !            71:     }
        !            72:
        !            73:   if (MPFR_SIGN(a) * signb < 0)
        !            74:     MPFR_CHANGE_SIGN(a);
        !            75:   MPFR_RET(inex);
1.1       maekawa    76: }