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 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
27 __mpn_mul_1 (res_ptr
, s1_ptr
, s1_size
, s2_limb
)
28 register mp_ptr res_ptr
;
29 register mp_srcptr s1_ptr
;
31 register mp_limb s2_limb
;
33 register mp_limb cy_limb
;
35 register mp_limb prod_high
, prod_low
;
37 /* The loop counter and index J goes from -S1_SIZE to -1. This way
38 the loop becomes faster. */
41 /* Offset the base pointers to compensate for the negative indices. */
48 umul_ppmm (prod_high
, prod_low
, s1_ptr
[j
], s2_limb
);
51 cy_limb
= (prod_low
< cy_limb
) + prod_high
;
53 res_ptr
[j
] = prod_low
;