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: }
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