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Annotation of OpenXM_contrib/gmp/mpf/mul_ui.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpf_mul_ui -- Multiply a float and an unsigned integer.
                      2:
1.1.1.3 ! ohara       3: Copyright 1993, 1994, 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:
                     25: void
                     26: mpf_mul_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
                     27: {
                     28:   mp_srcptr up;
                     29:   mp_size_t usize;
                     30:   mp_size_t size;
1.1.1.3 ! ohara      31:   mp_size_t prec;
1.1       maekawa    32:   mp_limb_t cy_limb;
                     33:   mp_ptr rp;
                     34:
                     35:   usize = u->_mp_size;
1.1.1.3 ! ohara      36:   if (usize == 0 || v == 0)
        !            37:     {
        !            38:       r->_mp_size = 0;
        !            39:       r->_mp_exp = 0;
        !            40:       return;
        !            41:     }
1.1       maekawa    42:
1.1.1.3 ! ohara      43:   size = ABS (usize);
        !            44:   prec = r->_mp_prec;
1.1       maekawa    45:   up = u->_mp_d;
                     46:   if (size > prec)
                     47:     {
                     48:       up += size - prec;
                     49:       size = prec;
                     50:     }
                     51:
                     52: #if 0
                     53:   /* Since we can do it at almost no cost, remove zero limbs at low end of
                     54:      result. */
                     55:   if (up[0] == 0)
                     56:     up++, size--;
                     57: #endif
                     58:
1.1.1.3 ! ohara      59:   rp = r->_mp_d;
        !            60:   cy_limb = mpn_mul_1 (rp, up, size, (mp_limb_t) v);
        !            61:   rp[size] = cy_limb;
        !            62:   cy_limb = cy_limb != 0;
        !            63:   r->_mp_exp = u->_mp_exp + cy_limb;
        !            64:   size += cy_limb;
        !            65:   r->_mp_size = usize >= 0 ? size : -size;
1.1       maekawa    66: }