tests-div.c
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/*
* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
#include <string.h>
#include "embUnit.h"
#include "tests-div.h"
#include "div.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
static const uint32_t u32_test_values[] = {
0,
1,
10,
32,
15625,
15625LU*5,
(15625LU*5)+1,
0xffff,
0xffff<<10,
0xffffffff,
};
static const uint64_t u64_test_values[] = {
11111111111ull,
0xffffffffull+1,
16383999997ull,
16383999998ull,
16383999999ull,
16384000000ull,
1048575999807ull,
1048575999808ull,
1048575999809ull,
0xffffffffffffeeull,
0x777777777777777ull,
0x1111111111111111ull,
0xffffffffffffffffull,
0x8000000000000000ull,
};
/* These expected values for test_div_u64_by_15625div512
* were computed from the expression (u64_test_values * 512) / 15625 using 128
* bit integers. */
static const uint64_t u64_15625_512_expected_values[] = {
364088888,
140737488,
536870911,
536870911,
536870911,
536870912,
34359738361,
34359738361,
34359738361,
2361183241434822,
17630168202713342,
40297527320487639,
604462909807314587,
302231454903657293,
};
#define N_U32_VALS (sizeof(u32_test_values)/sizeof(u32_test_values[0]))
#define N_U64_VALS (sizeof(u64_test_values)/sizeof(u64_test_values[0]))
static void test_div_u64_by_15625(void)
{
for (unsigned i = 0; i < N_U32_VALS; i++) {
DEBUG("Dividing %12"PRIu32" by 15625...\n", u32_test_values[i]);
TEST_ASSERT_EQUAL_INT(
(uint64_t)u32_test_values[i] / 15625,
div_u64_by_15625(u32_test_values[i]));
}
for (unsigned i = 0; i < N_U64_VALS; i++) {
DEBUG("Dividing %12"PRIu64" by 15625...\n", u64_test_values[i]);
TEST_ASSERT_EQUAL_INT(
(uint64_t)u64_test_values[i] / 15625,
div_u64_by_15625(u64_test_values[i]));
}
}
static void test_div_u32_by_15625div512(void)
{
for (unsigned i = 0; i < N_U32_VALS; i++) {
DEBUG("Dividing %"PRIu32" by (15625/512)...\n", u32_test_values[i]);
TEST_ASSERT_EQUAL_INT(
(uint64_t)u32_test_values[i] * 512lu / 15625,
div_u32_by_15625div512(u32_test_values[i]));
}
}
static void test_div_u64_by_1000000(void)
{
for (unsigned i = 0; i < N_U32_VALS; i++) {
DEBUG("Dividing %"PRIu32" by 1000000...\n", u32_test_values[i]);
TEST_ASSERT_EQUAL_INT(
(uint64_t)u32_test_values[i] / 1000000lu,
div_u64_by_1000000(u32_test_values[i]));
}
for (unsigned i = 0; i < N_U64_VALS; i++) {
DEBUG("Dividing %"PRIu64" by 1000000...\n", u64_test_values[i]);
TEST_ASSERT_EQUAL_INT(
u64_test_values[i] / 1000000lu,
div_u64_by_1000000(u64_test_values[i]));
}
}
static void test_div_u64_by_15625div512(void)
{
for (unsigned i = 0; i < N_U32_VALS; i++) {
DEBUG("Dividing %"PRIu32" by (15625/512)...\n", u32_test_values[i]);
TEST_ASSERT_EQUAL_INT(
(uint64_t)u32_test_values[i] * 512lu / 15625,
div_u64_by_15625div512(u32_test_values[i]));
}
for (unsigned i = 0; i < N_U64_VALS; i++) {
DEBUG("Dividing %"PRIu64" by (15625/512)...\n", u64_test_values[i]);
TEST_ASSERT_EQUAL_INT(
u64_15625_512_expected_values[i],
div_u64_by_15625div512(u64_test_values[i]));
}
}
Test *tests_div_tests(void)
{
EMB_UNIT_TESTFIXTURES(fixtures) {
new_TestFixture(test_div_u64_by_15625),
new_TestFixture(test_div_u32_by_15625div512),
new_TestFixture(test_div_u64_by_15625div512),
new_TestFixture(test_div_u64_by_1000000),
};
EMB_UNIT_TESTCALLER(div_tests, NULL, NULL, fixtures);
return (Test *)&div_tests;
}
void tests_div(void)
{
TESTS_RUN(tests_div_tests());
}