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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB 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.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/test.h>
#include <grub/dl.h>
#include <grub/misc.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_uint64_t vectors[][2] = {
{ 0xffffffffffffffffULL, 1},
{ 1, 0xffffffffffffffffULL},
{ 0xffffffffffffffffULL, 0xffffffffffffffffULL},
{ 1, 1 },
{ 2, 1 }
};
static void
test64(grub_uint64_t a, grub_uint64_t b)
{
grub_uint64_t r1 = a * b, r2 = 0, r3;
int i;
for (i = 0; i < 64; i++)
if ((a & (1LL << i)))
r2 += b << i;
r3 = ((grub_int64_t) a) * ((grub_int64_t) b);
grub_test_assert (r1 == r2,
"multiplication mismatch (u): 0x%llx x 0x%llx = 0x%llx != 0x%llx",
(long long) a, (long long) b, (long long) r2, (long long) r1);
grub_test_assert (r3 == r2,
"multiplication mismatch (s): 0x%llx x 0x%llx = 0x%llx != 0x%llx",
(long long) a, (long long) b, (long long) r2, (long long) r3);
}
static void
mul_test (void)
{
grub_uint64_t a = 404, b = 7;
grub_size_t i;
for (i = 0; i < ARRAY_SIZE (vectors); i++)
{
test64 (vectors[i][0], vectors[i][1]);
}
for (i = 0; i < 40000; i++)
{
a = 17 * a + 13 * b;
b = 23 * a + 29 * b;
if (b == 0)
b = 1;
if (a == 0)
a = 1;
test64 (a, b);
}
}
/* Register example_test method as a functional test. */
GRUB_FUNCTIONAL_TEST (mul_test, mul_test);
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