1 /* mpn_mul_1 -- Multiply a limb vector with a single limb and
2 store the product in a second limb vector.
4 Copyright (C) 1991, 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
6 This file is part of the GNU MP Library.
8 The GNU MP Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Library General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or (at your
11 option) any later version.
13 The GNU MP Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
16 License for more details.
18 You should have received a copy of the GNU Library General Public License
19 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21 MA 02111-1307, USA. */
29 mpn_mul_1 (res_ptr, s1_ptr, s1_size, s2_limb)
30 register mp_ptr res_ptr;
31 register mp_srcptr s1_ptr;
33 register mp_limb_t s2_limb;
35 register mp_limb_t cy_limb;
37 register mp_limb_t prod_high, prod_low;
39 /* The loop counter and index J goes from -S1_SIZE to -1. This way
40 the loop becomes faster. */
43 /* Offset the base pointers to compensate for the negative indices. */
50 umul_ppmm (prod_high, prod_low, s1_ptr[j], s2_limb);
53 cy_limb = (prod_low < cy_limb) + prod_high;
55 res_ptr[j] = prod_low;