pqc/external/flint-2.4.3/fq_zech/mul_ui.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#include "fq_zech.h"
void
fq_zech_mul_ui(fq_zech_t rop, const fq_zech_t op, const mp_limb_t x,
const fq_zech_ctx_t ctx)
{
mp_limb_t b;
if (x == 0 || fq_zech_is_zero(op, ctx))
{
fq_zech_zero(rop, ctx);
return;
}
b = x;
if (x >= ctx->p)
b = n_mod2_precomp(x, ctx->p, ctx->ppre);
if (b == 0)
fq_zech_zero(rop, ctx);
else
rop->value = n_addmod(op->value, ctx->prime_field_table[b], ctx->qm1);
}