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/*
Copyright (C) 2018-2021 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"
#include "fmpz_mpoly.h"
#include "fmpz_mpoly_factor.h"
int fmpz_mpoly_gcd(
fmpz_mpoly_t G,
const fmpz_mpoly_t A,
const fmpz_mpoly_t B,
const fmpz_mpoly_ctx_t ctx)
{
if (fmpz_mpoly_is_zero(A, ctx))
{
if (fmpz_mpoly_is_zero(B, ctx))
fmpz_mpoly_zero(G, ctx);
else if (fmpz_sgn(B->coeffs + 0) < 0)
fmpz_mpoly_neg(G, B, ctx);
else
fmpz_mpoly_set(G, B, ctx);
return 1;
}
if (fmpz_mpoly_is_zero(B, ctx))
{
if (fmpz_sgn(A->coeffs + 0) < 0)
fmpz_mpoly_neg(G, A, ctx);
else
fmpz_mpoly_set(G, A, ctx);
return 1;
}
return _fmpz_mpoly_gcd_algo(G, NULL, NULL, A, B, ctx, MPOLY_GCD_USE_ALL);
}