t-count_zeros.c
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上传日期:2022-08-06
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- /* Test count_leading_zeros and count_trailing_zeros.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser 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 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 Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "longlong.h"
- #include "tests.h"
- void
- check_clz (int want, mp_limb_t n)
- {
- int got;
- count_leading_zeros (got, n);
- if (got != want)
- {
- printf ("count_leading_zeros wrongn");
- mp_limb_trace (" n ", n);
- printf (" want %dn", want);
- printf (" got %dn", got);
- abort ();
- }
- }
- void
- check_ctz (int want, mp_limb_t n)
- {
- int got;
- count_trailing_zeros (got, n);
- if (got != want)
- {
- printf ("count_trailing_zeros wrongn");
- mpn_trace (" n ", &n, (mp_size_t) 1);
- printf (" want %dn", want);
- printf (" got %dn", got);
- abort ();
- }
- }
- void
- check_various (void)
- {
- int i;
- #ifdef COUNT_LEADING_ZEROS_0
- check_clz (COUNT_LEADING_ZEROS_0, CNST_LIMB(0));
- #endif
- for (i=0; i < GMP_LIMB_BITS; i++)
- {
- check_clz (i, CNST_LIMB(1) << (GMP_LIMB_BITS-1-i));
- check_ctz (i, CNST_LIMB(1) << i);
- check_ctz (i, MP_LIMB_T_MAX << i);
- check_clz (i, MP_LIMB_T_MAX >> i);
- }
- }
- int
- main (int argc, char *argv[])
- {
- tests_start ();
- mp_trace_base = 16;
- check_various ();
- tests_end ();
- exit (0);
- }