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/* Test mpz_popcount.
Copyright 2001, 2005 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 "tests.h"
void
check_onebit (void)
{
mpz_t n;
unsigned long i, got;
mpz_init (n);
for (i = 0; i < 5 * BITS_PER_MP_LIMB; i++)
{
mpz_setbit (n, i);
got = mpz_popcount (n);
if (got != 1)
{
printf ("mpz_popcount wrong on single bit at %lu\n", i);
printf (" got %lu, want 1\n", got);
abort();
}
mpz_clrbit (n, i);
}
mpz_clear (n);
}
void
check_data (void)
{
static const struct {
const char *n;
unsigned long want;
} data[] = {
{ "-1", ~ (unsigned long) 0 },
{ "-12345678", ~ (unsigned long) 0 },
{ "0", 0 },
{ "1", 1 },
{ "3", 2 },
{ "5", 2 },
{ "0xFFFF", 16 },
{ "0xFFFFFFFF", 32 },
{ "0xFFFFFFFFFFFFFFFF", 64 },
{ "0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", 128 },
};
unsigned long got;
int i;
mpz_t n;
mpz_init (n);
for (i = 0; i < numberof (data); i++)
{
mpz_set_str_or_abort (n, data[i].n, 0);
got = mpz_popcount (n);
if (got != data[i].want)
{
printf ("mpz_popcount wrong at data[%d]\n", i);
printf (" n \"%s\"\n", data[i].n);
printf (" "); mpz_out_str (stdout, 10, n); printf ("\n");
printf (" 0x"); mpz_out_str (stdout, 16, n); printf ("\n");
printf (" got %lu\n", got);
printf (" want %lu\n", data[i].want);
abort();
}
}
mpz_clear (n);
}
unsigned long
refmpz_popcount (mpz_t arg)
{
mp_size_t n, i;
unsigned long cnt;
mp_limb_t x;
n = SIZ(arg);
if (n < 0)
return ~(unsigned long) 0;
cnt = 0;
for (i = 0; i < n; i++)
{
x = PTR(arg)[i];
while (x != 0)
{
cnt += (x & 1);
x >>= 1;
}
}
return cnt;
}
void
check_random (void)
{
gmp_randstate_ptr rands;
mpz_t bs;
mpz_t arg;
unsigned long arg_size, size_range;
unsigned long got, ref;
int i;
rands = RANDS;
mpz_init (bs);
mpz_init (arg);
for (i = 0; i < 10000; i++)
{
mpz_urandomb (bs, rands, 32);
size_range = mpz_get_ui (bs) % 11 + 2; /* 0..4096 bit operands */
mpz_urandomb (bs, rands, size_range);
arg_size = mpz_get_ui (bs);
mpz_rrandomb (arg, rands, arg_size);
got = mpz_popcount (arg);
ref = refmpz_popcount (arg);
if (got != ref)
{
printf ("mpz_popcount wrong on random\n");
printf (" "); mpz_out_str (stdout, 10, arg); printf ("\n");
printf (" 0x"); mpz_out_str (stdout, 16, arg); printf ("\n");
printf (" got %lu\n", got);
printf (" want %lu\n", ref);
abort();
abort ();
}
}
mpz_clear (arg);
mpz_clear (bs);
}
int
main (void)
{
tests_start ();
check_onebit ();
check_data ();
check_random ();
tests_end ();
exit (0);
}
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