46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/*=============================================================================
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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) 2011 Fredrik Johansson
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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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int
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_nmod_vec_dot_bound_limbs(slong len, nmod_t mod)
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{
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mp_limb_t t2, t1, t0, u1, u0;
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umul_ppmm(t1, t0, mod.n - 1, mod.n - 1);
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umul_ppmm(t2, t1, t1, len);
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umul_ppmm(u1, u0, t0, len);
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add_sssaaaaaa(t2, t1, t0, t2, t1, UWORD(0), UWORD(0), u1, u0);
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if (t2 != 0) return 3;
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if (t1 != 0) return 2;
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return (t0 != 0);
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}
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