50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2010 William Hart
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******************************************************************************/
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#include <gmp.h>
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#include <stdlib.h>
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#include "flint.h"
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#include "ulong_extras.h"
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#include "nmod_vec.h"
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void _nmod_vec_scalar_mul_nmod(mp_ptr res, mp_srcptr vec,
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slong len, mp_limb_t c, nmod_t mod)
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{
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if (mod.norm >= FLINT_BITS/2) /* products will fit in a limb */
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{
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mpn_mul_1(res, vec, len, c);
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_nmod_vec_reduce(res, res, len, mod);
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} else /* products may take two limbs */
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{
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slong i;
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for (i = 0; i < len; i++)
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{
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mp_limb_t hi, lo;
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umul_ppmm(hi, lo, vec[i], c);
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NMOD_RED2(res[i], hi, lo, mod); /* hi already reduced mod n */
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}
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}
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}
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