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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 Cavium, Inc
*/
#include "test.h"
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_random.h>
#include <rte_reciprocal.h>
#define MAX_ITERATIONS (1ULL << 32)
#define DIVIDE_ITER (100)
static int
test_reciprocal(void)
{
int result = 0;
uint32_t divisor_u32 = 0;
uint32_t dividend_u32;
uint32_t nresult_u32;
uint32_t rresult_u32;
uint64_t i, j;
uint64_t divisor_u64 = 0;
uint64_t dividend_u64;
uint64_t nresult_u64;
uint64_t rresult_u64;
struct rte_reciprocal reci_u32 = {0};
struct rte_reciprocal_u64 reci_u64 = {0};
printf("Validating unsigned 32bit division.\n");
for (i = 0; i < MAX_ITERATIONS; i++) {
/* Change divisor every DIVIDE_ITER iterations. */
if (i % DIVIDE_ITER == 0) {
divisor_u32 = rte_rand();
reci_u32 = rte_reciprocal_value(divisor_u32);
}
dividend_u32 = rte_rand();
nresult_u32 = dividend_u32 / divisor_u32;
rresult_u32 = rte_reciprocal_divide(dividend_u32,
reci_u32);
if (nresult_u32 != rresult_u32) {
printf("Division failed, %"PRIu32"/%"PRIu32" = "
"expected %"PRIu32" result %"PRIu32"\n",
dividend_u32, divisor_u32,
nresult_u32, rresult_u32);
result = 1;
break;
}
}
printf("Validating unsigned 64bit division.\n");
for (i = 0; i < MAX_ITERATIONS; i++) {
/* Change divisor every DIVIDE_ITER iterations. */
if (i % DIVIDE_ITER == 0) {
divisor_u64 = rte_rand();
reci_u64 = rte_reciprocal_value_u64(divisor_u64);
}
dividend_u64 = rte_rand();
nresult_u64 = dividend_u64 / divisor_u64;
rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
&reci_u64);
if (nresult_u64 != rresult_u64) {
printf("Division failed, %"PRIu64"/%"PRIu64" = "
"expected %"PRIu64" result %"PRIu64"\n",
dividend_u64, divisor_u64,
nresult_u64, rresult_u64);
result = 1;
break;
}
}
printf("Validating unsigned 64bit division with 32bit divisor.\n");
for (i = 0; i < MAX_ITERATIONS; i++) {
/* Change divisor every DIVIDE_ITER iterations. */
if (i % DIVIDE_ITER == 0) {
divisor_u64 = rte_rand() >> 32;
reci_u64 = rte_reciprocal_value_u64(divisor_u64);
}
dividend_u64 = rte_rand();
nresult_u64 = dividend_u64 / divisor_u64;
rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
&reci_u64);
if (nresult_u64 != rresult_u64) {
printf("Division failed, %"PRIu64"/%"PRIu64" = "
"expected %"PRIu64" result %"PRIu64"\n",
dividend_u64, divisor_u64,
nresult_u64, rresult_u64);
result = 1;
break;
}
}
printf("Validating division by power of 2.\n");
for (i = 0; i < 32; i++) {
divisor_u64 = 1ull << i;
reci_u64 = rte_reciprocal_value_u64(divisor_u64);
reci_u32 = rte_reciprocal_value((uint32_t)divisor_u64);
for (j = 0; j < MAX_ITERATIONS >> 4; j++) {
dividend_u64 = rte_rand();
nresult_u64 = dividend_u64 / divisor_u64;
rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
&reci_u64);
if (nresult_u64 != rresult_u64) {
printf(
"Division 64 failed, %"PRIu64"/%"PRIu64" = "
"expected %"PRIu64" result %"PRIu64"\n",
dividend_u64, divisor_u64,
nresult_u64, rresult_u64);
result = 1;
}
nresult_u32 = (dividend_u64 >> 32) / divisor_u64;
rresult_u32 = rte_reciprocal_divide(
(dividend_u64 >> 32), reci_u32);
if (nresult_u32 != rresult_u32) {
printf(
"Division 32 failed, %"PRIu64"/%"PRIu64" = "
"expected %"PRIu64" result %"PRIu64"\n",
dividend_u64 >> 32, divisor_u64,
nresult_u64, rresult_u64);
result = 1;
break;
}
}
}
for (; i < 64; i++) {
divisor_u64 = 1ull << i;
reci_u64 = rte_reciprocal_value_u64(divisor_u64);
for (j = 0; j < MAX_ITERATIONS >> 4; j++) {
dividend_u64 = rte_rand();
nresult_u64 = dividend_u64 / divisor_u64;
rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
&reci_u64);
if (nresult_u64 != rresult_u64) {
printf("Division failed, %"PRIu64"/%"PRIu64" = "
"expected %"PRIu64" result %"PRIu64"\n",
dividend_u64, divisor_u64,
nresult_u64, rresult_u64);
result = 1;
break;
}
}
}
return result;
}
REGISTER_PERF_TEST(reciprocal_division, test_reciprocal);
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