tests/kernel/common/src/intmath.c

/*
 * Copyright (c) 2015 Wind River Systems, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <ztest.h>

void intmath_test(void)
{
	/*
	 * Declaring volatile so the compiler doesn't try to optimize any
	 * of the math away at build time
	 */
	volatile uint64_t bignum, ba, bb;
	volatile uint32_t num, a, b;

	ba = 0x00000012ABCDEF12ULL;
	bb = 0x0000001000000111ULL;
	bignum = ba * bb;
	assert_true((bignum == 0xbcdf0509369bf232ULL), "64-bit multiplication failed");

	a = 30000;
	b = 5872;
	num = a * b;
	assert_true((num == 176160000), "32-bit multiplication failed");

	a = 234424432;
	b = 98982;
	num = a / b;
	assert_true((num == 2368), "32-bit division failed");
}