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/*
Copyright (C) 2009, 2011 William Hart
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 "test_helpers.h"
#include "gmpcompat.h"
#include "mpn_extras.h"
#include "fft.h"
/* Defined in t-adjust.c, t-adjust_sqrt2.c, t-butterfly.c, t-butterfly_lshB.c,
* t-butterfly_rshB.c, t-butterfly_sqrt2.c, t-butterfly_twiddle.c,
* t-div_2expmod_2expp1.c, t-mul_2expmod_2expp1.c, t-negmod_2expp1.c,
* t-normmod_2expp1.c */
#ifndef set_p
#define set_p set_p
/* set p = 2^wn + 1 */
void set_p(mpz_t p, mp_size_t n, flint_bitcnt_t w)
{
flint_mpz_set_ui(p, 1);
mpz_mul_2exp(p, p, n*w);
flint_mpz_add_ui(p, p, 1);
}
#endif
TEST_FUNCTION_START(mpn_mul_2expmod_2expp1, state)
{
flint_bitcnt_t bits;
mp_size_t j, k, n, w, limbs, d;
mp_limb_t * nn, * r;
mpz_t p, m1, m2, mn1, mn2;
mpz_init(m1);
mpz_init(m2);
mpz_init(mn1);
mpz_init(mn2);
mpz_init(p);
/* normalisation mod p = 2^wn + 1 where B divides nw and n is a power of 2 */
for (bits = FLINT_BITS; bits < 16*FLINT_BITS; bits += FLINT_BITS)
{
for (j = 1; j < 32; j++)
{
for (k = 1; k <= FLINT_BITS; k <<= 1)
{
for (d = 0; d < FLINT_BITS; d++)
{
n = bits/k;
w = j*k;
limbs = (n*w)/GMP_LIMB_BITS;
nn = flint_malloc((limbs + 1)*sizeof(mp_limb_t));
r = flint_malloc((limbs + 1)*sizeof(mp_limb_t));
random_fermat(nn, state, limbs);
fermat_to_mpz(mn1, nn, limbs);
set_p(p, n, w);
mpn_mul_2expmod_2expp1(r, nn, limbs, d);
fermat_to_mpz(m2, r, limbs);
mpz_mod(m2, m2, p);
mpz_mod(m1, mn1, p);
mpz_mul_2exp(m1, m1, d);
mpz_mod(m1, m1, p);
if (mpz_cmp(m1, m2) != 0)
{
flint_printf("FAIL:\n");
flint_printf("mpn_mul_2expmod_2expp1 error\n");
gmp_printf("want %Zx\n\n", m1);
gmp_printf("got %Zx\n", m2);
fflush(stdout);
flint_abort();
}
flint_free(nn);
flint_free(r);
}
}
}
}
mpz_clear(mn2);
mpz_clear(mn1);
mpz_clear(m2);
mpz_clear(m1);
mpz_clear(p);
TEST_FUNCTION_END(state);
}