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/*
Copyright (C) 2024 Albin Ahlbäck
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 <gmp.h>
#include "longlong.h"
#include "fmpz.h"
void
fmpz_mul2_uiui(fmpz_t f, const fmpz_t g, ulong h0, ulong h1)
{
fmpz gs = *g;
if (h0 == 0 || h1 == 0 || gs == 0)
{
fmpz_zero(f);
return;
}
/* Now |f| >= |g| */
/* NOTE: Order important for x86 */
umul_ppmm(h1, h0, h0, h1);
/* Treat g first to reduce latency penalty of checking h1 */
if (!COEFF_IS_MPZ(gs))
{
int sign = gs < 0;
gs = FLINT_ABS(gs);
if (h1 == UWORD(0))
{
mpz_ptr mf;
umul_ppmm(h1, h0, h0, gs);
if (!COEFF_IS_MPZ(*f))
{
if (h1 == UWORD(0) && h0 <= COEFF_MAX)
{
*f = (sign) ? -h0 : h0;
return;
}
else
{
mf = _fmpz_new_mpz();
semi_small: mf->_mp_d[0] = h0;
mf->_mp_d[1] = h1;
mf->_mp_size = 1 + (h1 != 0);
if (sign)
mf->_mp_size = -mf->_mp_size;
*f = PTR_TO_COEFF(mf);
return;
}
}
else
{
if (h1 == UWORD(0) && h0 <= COEFF_MAX)
{
_fmpz_clear_mpz(*f);
*f = (sign) ? -h0 : h0;
return;
}
else
{
mf = COEFF_TO_PTR(*f);
goto semi_small;
}
}
}
else
{
/* h1 != 0, but gs small */
ulong f0, f1, f2;
mpz_ptr mf;
umul_ppmm(f1, f0, gs, h0);
umul_ppmm(f2, gs, gs, h1);
mf = _fmpz_promote(f);
add_ssaaaa(f2, f1, f2, f1, 0, gs);
if (f2 == UWORD(0))
{
mf->_mp_d[0] = f0;
mf->_mp_d[1] = f1;
mf->_mp_size = (sign) ? -2 : 2;
}
else
{
mp_ptr fp = FLINT_MPZ_REALLOC(mf, 3);
fp[0] = f0;
fp[1] = f1;
fp[2] = f2;
mf->_mp_size = (sign) ? -3 : 3;
}
}
}
else
{
mpz_srcptr mg = COEFF_TO_PTR(gs);
mpz_ptr mf = _fmpz_promote(f);
mpz_t mu;
mp_limb_t u[2] = {h0, h1};
mu->_mp_d = u;
mu->_mp_size = 1 + (h1 != UWORD(0));
mpz_mul(mf, mg, mu);
}
}