82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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/* divide.c -- benchmark plain integer division.
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Copyright 2003 Free Software Foundation, Inc.
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This file is part of the MPIRbench.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdlib.h>
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#include <stdio.h>
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#include "mpir.h"
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#include "timing.h"
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int
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main (int argc, char *argv[])
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{
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gmp_randstate_t rs;
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mpz_t x, y, z;
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unsigned long int m, n, i, niter, t0, ti;
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double t, f, ops_per_sec;
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int decimals;
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if (argc != 3)
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{
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fprintf (stderr, "usage: %s m n\n", argv[0]);
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fprintf (stderr, " where m is number of dividend bits\n");
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fprintf (stderr, " and n is number of divisor bits\n");
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return -1;
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}
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m = atoi (argv[1]);
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n = atoi (argv[2]);
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gmp_randinit_default (rs);
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mpz_init (x);
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mpz_init (y);
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mpz_init (z);
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mpz_urandomb (x, rs, m);
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mpz_urandomb (y, rs, n);
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printf ("Calibrating CPU speed..."); fflush (stdout);
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TIME (t, mpz_tdiv_q (z, x, y));
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printf ("done\n");
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niter = 1 + (unsigned long) (1e4 / t);
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printf ("Dividing an %lu-bit number by an %lu-bit number %lu times...",
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m, n, niter);
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fflush (stdout);
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t0 = cputime ();
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for (i = niter; i > 0; i--)
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{
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mpz_tdiv_q (z, x, y);
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}
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ti = cputime () - t0;
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printf ("done!\n");
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ops_per_sec = 1000.0 * niter / ti;
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f = 100.0;
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for (decimals = 0;; decimals++)
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{
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if (ops_per_sec > f)
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break;
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f = f * 0.1;
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}
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printf ("RESULT: %.*f operations per second\n", decimals, ops_per_sec);
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return 0;
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}
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