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/*
Copyright (C) 2018-2020 Daniel Schultz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz.h"
#include "mpoly.h"
/* TODO: this could a bit faster */
int mpoly_is_poly(
const ulong * Aexps,
slong Alen,
flint_bitcnt_t Abits,
slong var,
const mpoly_ctx_t mctx)
{
int ret = 1;
slong i, j;
slong N = mpoly_words_per_exp(Abits, mctx);
slong nvars = mctx->nvars;
fmpz * t;
TMP_INIT;
TMP_START;
t = (fmpz *) TMP_ALLOC(nvars*sizeof(fmpz));
for (i = 0; i < nvars; i++)
fmpz_init(t + i);
for (i = 0; i < Alen; i++)
{
mpoly_get_monomial_ffmpz(t, Aexps + N*i, Abits, mctx);
for (j = 0; j < nvars; j++)
{
if (j != var && !fmpz_is_zero(t + j))
{
ret = 0;
goto cleanup;
}
}
}
cleanup:
for (i = 0; i < nvars; i++)
fmpz_clear(t + i);
TMP_END;
return ret;
}