diff options
Diffstat (limited to 'test/test/test_reciprocal_division_perf.c')
| -rw-r--r-- | test/test/test_reciprocal_division_perf.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/test/test/test_reciprocal_division_perf.c b/test/test/test_reciprocal_division_perf.c new file mode 100644 index 00000000..a7be8aa7 --- /dev/null +++ b/test/test/test_reciprocal_division_perf.c @@ -0,0 +1,201 @@ +/* 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 (1ULL << 28) + +static int +test_reciprocal_division_perf(void) +{ + int result = 0; + uint32_t divisor_u32 = 0; + uint32_t dividend_u32; + uint64_t divisor_u64 = 0; + uint64_t dividend_u64; + volatile uint32_t nresult_u32; + volatile uint32_t rresult_u32; + volatile uint64_t nresult_u64; + volatile uint64_t rresult_u64; + uint64_t start_cyc; + uint64_t split_cyc; + uint64_t end_cyc; + uint64_t tot_cyc_n = 0; + uint64_t tot_cyc_r = 0; + uint64_t i; + struct rte_reciprocal reci_u32 = {0}; + struct rte_reciprocal_u64 reci_u64 = {0}; + + rte_srand(rte_rdtsc()); + + 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(); + + start_cyc = rte_rdtsc(); + nresult_u32 = dividend_u32 / divisor_u32; + split_cyc = rte_rdtsc(); + rresult_u32 = rte_reciprocal_divide(dividend_u32, + reci_u32); + end_cyc = rte_rdtsc(); + + tot_cyc_n += split_cyc - start_cyc; + tot_cyc_r += end_cyc - split_cyc; + if (nresult_u32 != rresult_u32) { + printf("Division failed, expected %"PRIu32" " + "result %"PRIu32"", + nresult_u32, rresult_u32); + result = 1; + break; + } + } + printf("32bit Division results:\n"); + printf("Total number of cycles normal division : %"PRIu64"\n", + tot_cyc_n); + printf("Total number of cycles reciprocal division : %"PRIu64"\n", + tot_cyc_r); + printf("Cycles per division(normal) : %3.2f\n", + ((double)tot_cyc_n)/i); + printf("Cycles per division(reciprocal) : %3.2f\n\n", + ((double)tot_cyc_r)/i); + + tot_cyc_n = 0; + tot_cyc_r = 0; + + 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(); + + start_cyc = rte_rdtsc(); + nresult_u64 = dividend_u64 / divisor_u64; + split_cyc = rte_rdtsc(); + rresult_u64 = rte_reciprocal_divide_u64(dividend_u64, + &reci_u64); + end_cyc = rte_rdtsc(); + + tot_cyc_n += split_cyc - start_cyc; + tot_cyc_r += end_cyc - split_cyc; + if (nresult_u64 != rresult_u64) { + printf("Division failed, expected %"PRIu64" " + "result %"PRIu64"", + nresult_u64, rresult_u64); + result = 1; + break; + } + } + printf("64bit Division results:\n"); + printf("Total number of cycles normal division : %"PRIu64"\n", + tot_cyc_n); + printf("Total number of cycles reciprocal division : %"PRIu64"\n", + tot_cyc_r); + printf("Cycles per division(normal) : %3.2f\n", + ((double)tot_cyc_n)/i); + printf("Cycles per division(reciprocal) : %3.2f\n\n", + ((double)tot_cyc_r)/i); + + tot_cyc_n = 0; + tot_cyc_r = 0; + + 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(); + + start_cyc = rte_rdtsc(); + nresult_u64 = dividend_u64 / divisor_u64; + split_cyc = rte_rdtsc(); + rresult_u64 = rte_reciprocal_divide_u64(dividend_u64, + &reci_u64); + end_cyc = rte_rdtsc(); + + tot_cyc_n += split_cyc - start_cyc; + tot_cyc_r += end_cyc - split_cyc; + if (nresult_u64 != rresult_u64) { + printf("Division failed, expected %"PRIu64" " + "result %"PRIu64"", + nresult_u64, rresult_u64); + result = 1; + break; + } + } + + printf("64bit Division results:\n"); + printf("Total number of cycles normal division : %"PRIu64"\n", + tot_cyc_n); + printf("Total number of cycles reciprocal division : %"PRIu64"\n", + tot_cyc_r); + printf("Cycles per division(normal) : %3.2f\n", + ((double)tot_cyc_n)/i); + printf("Cycles per division(reciprocal) : %3.2f\n\n", + ((double)tot_cyc_r)/i); + + tot_cyc_n = 0; + tot_cyc_r = 0; + + printf("Validating division by power of 2.\n"); + for (i = 0; i < 64; i++) { + divisor_u64 = 1ull << i; + reci_u64 = rte_reciprocal_value_u64(divisor_u64); + + dividend_u64 = rte_rand(); + + start_cyc = rte_rdtsc(); + nresult_u64 = dividend_u64 / divisor_u64; + split_cyc = rte_rdtsc(); + rresult_u64 = rte_reciprocal_divide_u64(dividend_u64, + &reci_u64); + end_cyc = rte_rdtsc(); + + tot_cyc_n += split_cyc - start_cyc; + tot_cyc_r += end_cyc - split_cyc; + 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; + break; + } + } + printf("64bit Division results:\n"); + printf("Total number of cycles normal division : %"PRIu64"\n", + tot_cyc_n); + printf("Total number of cycles reciprocal division : %"PRIu64"\n", + tot_cyc_r); + printf("Cycles per division(normal) : %3.2f\n", + ((double)tot_cyc_n)/i); + printf("Cycles per division(reciprocal) : %3.2f\n", + ((double)tot_cyc_r)/i); + + return result; +} + +REGISTER_TEST_COMMAND(reciprocal_division_perf, test_reciprocal_division_perf); |