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/*
Copyright (C) 2018 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 "mpn_extras.h"
#include "fmpz.h"
#include "mpoly.h"
void mpoly_unpack_vec_ui(ulong * exp1, const ulong * exp2, flint_bitcnt_t bits,
slong nfields, slong len)
{
if (bits < FLINT_BITS)
{
slong i, j, shift;
ulong u, mask = (-UWORD(1)) >> (FLINT_BITS - bits);
for (j = 0; j < len; j++)
{
i = 0;
u = *exp2++;
shift = 0;
*exp1++ = u & mask;
u = u >> bits; /* number of bits to encode 0th field */
shift += bits; /* number of bits to encode 0th field */
while (++i < nfields)
{
if (shift + bits > FLINT_BITS)
{
u = *exp2++;
shift = 0;
}
*exp1++ = u & mask;
u = u >> bits; /* number of bits to encode ith field */
shift += bits; /* number of bits to encode ith field */
}
}
}
else
{
slong j;
ulong words_per_field = bits/FLINT_BITS;
FLINT_ASSERT(bits%FLINT_BITS == 0);
for (j = 0; j < len*nfields; j++, exp2 += words_per_field)
{
*exp1++ = *exp2;
}
}
}
void mpoly_unpack_vec_fmpz(fmpz * exp1, const ulong * exp2, flint_bitcnt_t bits,
slong nfields, slong len)
{
if (bits < FLINT_BITS)
{
slong i, j, shift;
ulong u, mask = (-UWORD(1)) >> (FLINT_BITS - bits);
for (j = 0; j < len; j++)
{
i = 0;
u = *exp2++;
shift = 0;
fmpz_set_ui(exp1++, u & mask);
u = u >> bits; /* number of bits to encode 0th field */
shift += bits; /* number of bits to encode 0th field */
while (++i < nfields)
{
if (shift + bits > FLINT_BITS)
{
u = *exp2++;
shift = 0;
}
fmpz_set_ui(exp1++, u & mask);
u = u >> bits; /* number of bits to encode ith field */
shift += bits; /* number of bits to encode ith field */
}
}
}
else
{
slong j;
ulong words_per_field = bits/FLINT_BITS;
FLINT_ASSERT(bits%FLINT_BITS == 0);
for (j = 0; j < len*nfields; j++, exp2 += words_per_field)
{
ulong size = words_per_field;
while (size > 1 && exp2[size - 1] == 0)
size--;
if (size == 1)
{
fmpz_set_ui(exp1, exp2[0]);
}
else
{
mpz_ptr mpz = _fmpz_promote(exp1);
mp_ptr zp = FLINT_MPZ_REALLOC(mpz, words_per_field);
mpz->_mp_size = size;
flint_mpn_copyi(zp, exp2, size);
}
exp1++;
}
}
}