mirror of
https://github.com/Stichting-MINIX-Research-Foundation/netbsd.git
synced 2025-09-18 19:55:29 -04:00
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/*
|
|
|
|
Copyright 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 http://www.gnu.org/licenses/. */
|
|
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
#include "testutils.h"
|
|
|
|
#define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)
|
|
|
|
#define COUNT 10000
|
|
|
|
static void
|
|
dump (const char *label, const mpz_t x)
|
|
{
|
|
char *buf = mpz_get_str (NULL, 16, x);
|
|
fprintf (stderr, "%s: %s\n", label, buf);
|
|
testfree (buf);
|
|
}
|
|
|
|
void
|
|
testmain (int argc, char **argv)
|
|
{
|
|
unsigned i;
|
|
mpz_t u, m, p, t;
|
|
|
|
mpz_init (u);
|
|
mpz_init (m);
|
|
mpz_init (p);
|
|
mpz_init (t);
|
|
|
|
for (i = 0; i < COUNT; i++)
|
|
{
|
|
mini_urandomb (u, GMP_LIMB_BITS);
|
|
mpz_setbit (u, GMP_LIMB_BITS -1);
|
|
|
|
mpz_set_ui (m, mpn_invert_limb (u->_mp_d[0]));
|
|
mpz_setbit (m, GMP_LIMB_BITS);
|
|
|
|
mpz_mul (p, m, u);
|
|
|
|
mpz_set_ui (t, 0);
|
|
mpz_setbit (t, 2* GMP_LIMB_BITS);
|
|
mpz_sub (t, t, p);
|
|
|
|
/* Should have 0 < B^2 - m u <= u */
|
|
if (mpz_sgn (t) <= 0 || mpz_cmp (t, u) > 0)
|
|
{
|
|
fprintf (stderr, "mpn_invert_limb failed:\n");
|
|
dump ("u", u);
|
|
dump ("m", m);
|
|
dump ("p", p);
|
|
dump ("t", t);
|
|
abort ();
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < COUNT; i++)
|
|
{
|
|
mini_urandomb (u, 2*GMP_LIMB_BITS);
|
|
mpz_setbit (u, 2*GMP_LIMB_BITS -1);
|
|
|
|
mpz_set_ui (m, mpn_invert_3by2 (u->_mp_d[1], u[0]._mp_d[0]));
|
|
|
|
mpz_setbit (m, GMP_LIMB_BITS);
|
|
|
|
mpz_mul (p, m, u);
|
|
|
|
mpz_set_ui (t, 0);
|
|
mpz_setbit (t, 3 * GMP_LIMB_BITS);
|
|
mpz_sub (t, t, p);
|
|
|
|
/* Should have 0 < B^3 - m u <= u */
|
|
if (mpz_sgn (t) <= 0 || mpz_cmp (t, u) > 0)
|
|
{
|
|
fprintf (stderr, "mpn_invert_3by2 failed:\n");
|
|
dump ("u", u);
|
|
dump ("m", m);
|
|
dump ("p", p);
|
|
dump ("t", t);
|
|
abort ();
|
|
}
|
|
}
|
|
|
|
mpz_clear (u);
|
|
mpz_clear (m);
|
|
mpz_clear (p);
|
|
mpz_clear (t);
|
|
}
|