170 lines
4.8 KiB
C
170 lines
4.8 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2013 William Hart
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******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmp.h>
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#include <math.h>
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#include "profiler.h"
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#include "flint.h"
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#include "longlong.h"
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#include "mpn_extras.h"
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#include "ulong_extras.h"
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#define mock_mulmod_preinvn(rxx, axx, bxx, nnn, nxx, ninv, norm) \
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do { \
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mp_ptr __t; \
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TMP_INIT; \
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\
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TMP_START; \
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__t = TMP_ALLOC(3*(nnn)*sizeof(mp_limb_t)); \
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\
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mpn_mul_n(__t, axx, bxx, nnn); \
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if (norm) \
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mpn_rshift(__t, __t, 2*(nnn), norm); \
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\
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mpn_tdiv_qr(__t + 2*(nnn), rxx, 0, __t, 2*(nnn), nxx, nnn); \
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TMP_END; \
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} while (0)
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typedef struct
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{
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slong limbs;
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int algo;
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} info_t;
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void sample(void * arg, ulong count)
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{
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info_t * info = (info_t *) arg;
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slong size = info->limbs, i, j;
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int algo = info->algo;
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int scale = 200;
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mpz_t a, b, d, r2;
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gmp_randstate_t st;
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FLINT_TEST_INIT(state);
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mp_ptr dinv;
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mp_bitcnt_t norm;
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mpz_init(a);
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mpz_init(b);
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mpz_init(d);
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/* don't init r2 */
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gmp_randinit_default(st);
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for (i = 0; i < count; i++)
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{
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mpz_rrandomb(a, st, size*FLINT_BITS);
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mpz_rrandomb(b, st, size*FLINT_BITS);
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do {
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mpz_rrandomb(d, st, size*FLINT_BITS);
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} while (mpz_sgn(d) == 0);
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/* reduce a, b mod d */
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mpz_fdiv_r(a, a, d);
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mpz_fdiv_r(b, b, d);
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/* normalise */
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count_leading_zeros(norm, d->_mp_d[d->_mp_size - 1]);
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mpz_mul_2exp(a, a, norm);
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mpz_mul_2exp(b, b, norm);
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mpz_mul_2exp(d, d, norm);
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dinv = flint_malloc(size*sizeof(mp_limb_t));
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flint_mpn_preinvn(dinv, d->_mp_d, size);
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r2->_mp_d = flint_malloc(size*sizeof(mp_limb_t));
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prof_start();
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if (algo == 1)
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{
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for (j = 0; j < scale; j++)
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{
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flint_mpn_mulmod_preinvn(r2->_mp_d, a->_mp_d, b->_mp_d, size, d->_mp_d, dinv, norm);
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}
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} else
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{
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for (j = 0; j < scale; j++)
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{
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mock_mulmod_preinvn(r2->_mp_d, a->_mp_d, b->_mp_d, size, d->_mp_d, dinv, norm);
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}
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}
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prof_stop();
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flint_free(r2->_mp_d);
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flint_free(dinv);
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}
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mpz_clear(a);
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mpz_clear(b);
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mpz_clear(d);
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/* don't init r2 */
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gmp_randclear(st);
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flint_randclear(state);
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}
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int main(void)
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{
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double min, max;
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info_t info;
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slong k, scale;
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printf("1: With precomputed inverse\n");
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printf("2: Without precomputed inverse\n\n");
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for (k = 1; k <= 10000; k = (slong) ceil(1.1*k))
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{
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info.limbs = k;
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info.algo = 1;
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scale = 200;
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prof_repeat(&min, &max, sample, (void *) &info);
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flint_printf("1: limbs %wd, min %.3g ms, max %.3g ms\n",
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info.limbs,
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((min/(double)FLINT_CLOCK_SCALE_FACTOR)/scale)/2400000.0,
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((max/(double)FLINT_CLOCK_SCALE_FACTOR)/scale)/2400000.0
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);
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info.algo = 2;
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prof_repeat(&min, &max, sample, (void *) &info);
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flint_printf("2: limbs %wd, min %.3g ms, max %.3g ms\n\n",
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info.limbs,
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((min/(double)FLINT_CLOCK_SCALE_FACTOR)/scale)/2400000.0,
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((max/(double)FLINT_CLOCK_SCALE_FACTOR)/scale)/2400000.0
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);
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}
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return 0;
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}
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