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/*
Copyright (C) 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"
#include "fmpz_mpoly.h"
/*
Ensure that A has space for "len" terms with bits "bits" and set A->bits
The value of A is destroyed.
Since the coefficient alloc and the exponent alloc are coupled, we must
have the assumption that A is allocated wrt ctx upon entry.
TODO: decouple the two allocations as in nmod_mpoly/fq_nmod_mpoly
*/
void fmpz_mpoly_fit_length_reset_bits(
fmpz_mpoly_t A,
slong len,
flint_bitcnt_t bits,
const fmpz_mpoly_ctx_t ctx)
{
slong i;
slong oldN = mpoly_words_per_exp(A->bits, ctx->minfo);
slong newN = mpoly_words_per_exp(bits, ctx->minfo);
if (len > A->alloc)
{
len = FLINT_MAX(len, 2*A->alloc);
A->exps = (ulong *) flint_realloc(A->exps, newN*len*sizeof(ulong));
A->coeffs = (fmpz *) flint_realloc(A->coeffs, len*sizeof(fmpz));
for (i = A->alloc; i < len; i++)
fmpz_init(A->coeffs + i);
A->alloc = len;
}
else if (newN > oldN && A->alloc > 0)
{
A->exps = (ulong *) flint_realloc(A->exps, newN*A->alloc*sizeof(ulong));
}
A->bits = bits;
}