third_party/gmp/tests/t-popc.c

/* Test popc_limb.

Copyright 2002, 2012 Free Software Foundation, Inc.

This file is part of the GNU MP Library test suite.

The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.

The GNU MP Library test suite is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
Public License for more details.

You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */

#include <stdio.h>
#include <stdlib.h>

#include "gmp-impl.h"
#include "tests.h"


int
main (void)
{
  mp_limb_t  src, want, got;
  int        i;

  tests_start ();
  mp_trace_base = -16;

  for (i = 0; i < GMP_LIMB_BITS; i++)
    {
      src = CNST_LIMB(1) << i;
      want = 1;

      popc_limb (got, src);
      if (got != want)
        {
        error:
          printf ("popc_limb wrong result\n");
          mpn_trace ("  src ", &src,  (mp_size_t) 1);
          mpn_trace ("  want", &want, (mp_size_t) 1);
          mpn_trace ("  got ", &got,  (mp_size_t) 1);
          abort ();
        }
    }

  src = 0;
  want = 0;
  for (i = 0; i < GMP_LIMB_BITS; i++)
    {
      src += CNST_LIMB(1) << i;
      want += 1;

      popc_limb (got, src);
      if (got != want)
        {
	  goto error;
        }
    }

  for (i = 0; i < 100; i++)
    {
      mpn_random2 (&src, (mp_size_t) 1);
      want = ref_popc_limb (src);

      popc_limb (got, src);
      if (got != want)
        goto error;
    }

  tests_end ();
  exit (0);
}