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/* Measure memcpy performance.
Copyright (C) 2016-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define MIN_PAGE_SIZE 131072
#define TEST_MAIN
#define TEST_NAME "memcpy"
#include "bench-string.h"
#include <assert.h>
#include "json-lib.h"
IMPL (memcpy, 1)
#define NUM_COPIES 4096
typedef struct { uint16_t size; uint16_t freq; } freq_data_t;
typedef struct { uint8_t align; uint8_t freq; } align_data_t;
#define SIZE_NUM 1024
#define SIZE_MASK (SIZE_NUM-1)
static uint8_t size_arr[SIZE_NUM];
/* Frequency data for memcpy of less than 256 bytes based on SPEC2006. */
static freq_data_t size_freq[] =
{
{ 8, 576}, {104, 94}, { 24, 78}, { 48, 58}, { 32, 48}, { 16, 46},
{ 1, 30}, { 96, 12}, { 72, 11}, {216, 11}, {192, 8}, { 12, 7},
{144, 5}, { 2, 4}, { 64, 4}, {120, 4}, { 4, 3}, { 40, 2},
{ 7, 2}, {168, 2}, {160, 2}, {128, 1}, { 3, 1}, { 9, 1},
{176, 1}, {240, 1}, { 11, 1}, { 0, 1}, { 5, 1}, { 6, 1},
{ 80, 1}, { 52, 1}, {152, 1}, { 10, 1}, { 56, 1}, { 51, 1},
{ 14, 1}, {208, 1}, { 0, 0}
};
#define ALIGN_NUM 256
#define ALIGN_MASK (ALIGN_NUM-1)
static uint8_t src_align_arr[ALIGN_NUM];
static uint8_t dst_align_arr[ALIGN_NUM];
/* Source alignment frequency for memcpy based on SPEC2006. */
static align_data_t src_align_freq[] =
{
{16, 144}, {8, 86}, {3, 23}, {1, 3}, {0, 0}
};
/* Destination alignment frequency for memcpy based on SPEC2006. */
static align_data_t dst_align_freq[] =
{
{16, 197}, {8, 30}, {3, 23}, {1, 6}, {0, 0}
};
typedef struct
{
uint16_t src;
uint16_t dst;
uint16_t len;
} copy_t;
static copy_t copy[NUM_COPIES];
typedef char *(*proto_t) (char *, const char *, size_t);
static void
init_copy_distribution (void)
{
int i, j, freq, size, n;
for (n = i = 0; (freq = size_freq[i].freq) != 0; i++)
for (j = 0, size = size_freq[i].size; j < freq; j++)
size_arr[n++] = size;
assert (n == SIZE_NUM);
for (n = i = 0; (freq = src_align_freq[i].freq) != 0; i++)
for (j = 0, size = src_align_freq[i].align; j < freq; j++)
src_align_arr[n++] = size - 1;
assert (n == ALIGN_NUM);
for (n = i = 0; (freq = dst_align_freq[i].freq) != 0; i++)
for (j = 0, size = dst_align_freq[i].align; j < freq; j++)
dst_align_arr[n++] = size - 1;
assert (n == ALIGN_NUM);
}
static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
copy_t *copy, size_t n)
{
timing_t start, stop, cur;
size_t iters = INNER_LOOP_ITERS_MEDIUM;
TIMING_NOW (start);
for (int i = 0; i < iters; ++i)
for (int j = 0; j < n; j++)
CALL (impl, dst + copy[j].dst, src + copy[j].src, copy[j].len);
TIMING_NOW (stop);
TIMING_DIFF (cur, start, stop);
json_element_double (json_ctx, (double) cur / (double) iters);
}
static void
do_test (json_ctx_t *json_ctx, size_t max_size)
{
for (int i = 0; i < max_size; i++)
buf1[i] = i * 3;
/* Create a random set of copies with the given size and alignment
distributions. */
for (int i = 0; i < NUM_COPIES; i++)
{
copy[i].dst = (rand () & (max_size - 1)) | 1;
copy[i].dst &= ~dst_align_arr[rand () & ALIGN_MASK];
copy[i].src = (rand () & (max_size - 1)) | 3;
copy[i].src &= ~src_align_arr[rand () & ALIGN_MASK];
copy[i].len = size_arr[rand () & SIZE_MASK];
}
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "max-size", (double) max_size);
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, copy, NUM_COPIES);
json_array_end (json_ctx);
json_element_object_end (json_ctx);
}
int
test_main (void)
{
json_ctx_t json_ctx;
test_init ();
init_copy_distribution ();
json_init (&json_ctx, 0, stdout);
json_document_begin (&json_ctx);
json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
json_attr_object_begin (&json_ctx, "functions");
json_attr_object_begin (&json_ctx, TEST_NAME);
json_attr_string (&json_ctx, "bench-variant", "random");
json_array_begin (&json_ctx, "ifuncs");
FOR_EACH_IMPL (impl, 0)
json_element_string (&json_ctx, impl->name);
json_array_end (&json_ctx);
json_array_begin (&json_ctx, "results");
for (int i = 4; i <= 64; i = i * 2)
do_test (&json_ctx, i * 1024);
json_array_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_document_end (&json_ctx);
return ret;
}
#include <support/test-driver.c>
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