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Annotation of OpenXM_contrib/gmp/mpf/mul_ui.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpf_mul_ui -- Multiply a float and an unsigned integer.
                      2:
                      3: Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
                      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
                      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 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
                     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 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: #if __STDC__
                     27: mpf_mul_ui (mpf_ptr r, mpf_srcptr u, unsigned long int v)
                     28: #else
                     29: mpf_mul_ui (r, u, v)
                     30:      mpf_ptr r;
                     31:      mpf_srcptr u;
                     32:      unsigned long int v;
                     33: #endif
                     34: {
                     35:   mp_srcptr up;
                     36:   mp_size_t usize;
                     37:   mp_size_t size;
                     38:   mp_size_t prec = r->_mp_prec;
                     39:   mp_limb_t cy_limb;
                     40:   mp_ptr rp;
                     41:
                     42:   usize = u->_mp_size;
                     43:   size = ABS (usize);
                     44:
                     45:   rp = r->_mp_d;
                     46:   up = u->_mp_d;
                     47:   if (size > prec)
                     48:     {
                     49:       up += size - prec;
                     50:       size = prec;
                     51:     }
                     52:
                     53: #if 0
                     54:   /* Since we can do it at almost no cost, remove zero limbs at low end of
                     55:      result. */
                     56:   if (up[0] == 0)
                     57:     up++, size--;
                     58: #endif
                     59:
                     60:   if (size == 0 || v == 0)
                     61:     {
                     62:       r->_mp_size = 0;
                     63:       r->_mp_exp = 0;          /* ??? */
                     64:     }
                     65:   else
                     66:     {
                     67:       cy_limb = mpn_mul_1 (rp, up, size, (mp_limb_t) v);
                     68:       rp[size] = cy_limb;
                     69:       cy_limb = cy_limb != 0;
                     70:       r->_mp_exp = u->_mp_exp + cy_limb;
                     71:       size += cy_limb;
                     72:       r->_mp_size = usize >= 0 ? size : -size;
                     73:     }
                     74: }