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Annotation of OpenXM_contrib/gmp/mpz/set_f.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
                      2:
1.1.1.3 ! ohara       3: Copyright 1996, 2001 Free Software Foundation, Inc.
1.1       maekawa     4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2   maekawa     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 GNU MP 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   maekawa    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   maekawa    17: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    18: along with the GNU MP 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:
1.1.1.3 ! ohara      25:
1.1       maekawa    26: void
                     27: mpz_set_f (mpz_ptr w, mpf_srcptr u)
                     28: {
1.1.1.3 ! ohara      29:   mp_ptr    wp, up;
        !            30:   mp_size_t size;
        !            31:   mp_exp_t  exp;
1.1       maekawa    32:
1.1.1.3 ! ohara      33:   /* abs(u)<1 truncates to zero */
1.1       maekawa    34:   exp = EXP (u);
                     35:   if (exp <= 0)
                     36:     {
1.1.1.3 ! ohara      37:       SIZ(w) = 0;
1.1       maekawa    38:       return;
                     39:     }
1.1.1.3 ! ohara      40:
        !            41:   MPZ_REALLOC (w, exp);
        !            42:   wp = PTR(w);
        !            43:   up = PTR(u);
        !            44:
        !            45:   size = SIZ (u);
        !            46:   SIZ(w) = (size >= 0 ? exp : -exp);
        !            47:   size = ABS (size);
        !            48:
        !            49:   if (exp > size)
1.1       maekawa    50:     {
1.1.1.3 ! ohara      51:       /* pad with low zeros to get a total "exp" many limbs */
        !            52:       mp_size_t  zeros = exp - size;
        !            53:       MPN_ZERO (wp, zeros);
        !            54:       wp += zeros;
1.1       maekawa    55:     }
                     56:   else
                     57:     {
1.1.1.3 ! ohara      58:       /* exp<=size, trucate to the high "exp" many limbs */
        !            59:       up += (size - exp);
        !            60:       size = exp;
1.1       maekawa    61:     }
                     62:
1.1.1.3 ! ohara      63:   MPN_COPY (wp, up, size);
1.1       maekawa    64: }