mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
2623479105
Adjust iteration counts so benchmarks don't run too slowly or quickly. Ensure benchmarks take less than 10 seconds on older, slower cores and more than 0.5 seconds on fast cores. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
300 lines
8.8 KiB
C
300 lines
8.8 KiB
C
/* Measure strcmp and wcscmp functions.
|
|
Copyright (C) 2013-2023 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 TEST_MAIN
|
|
#ifdef WIDE
|
|
# define TEST_NAME "wcscmp"
|
|
#else
|
|
# define TEST_NAME "strcmp"
|
|
#endif
|
|
#include "bench-string.h"
|
|
#include "json-lib.h"
|
|
|
|
#ifdef WIDE
|
|
# define CHARBYTESLOG 2
|
|
# define MIDCHAR 0x7fffffff
|
|
# define LARGECHAR 0xfffffffe
|
|
#else
|
|
# define CHARBYTESLOG 0
|
|
# define MIDCHAR 0x7f
|
|
# define LARGECHAR 0xfe
|
|
|
|
int
|
|
generic_strcmp (const char *s1, const char *s2);
|
|
|
|
IMPL (generic_strcmp, 0)
|
|
|
|
#endif
|
|
|
|
typedef int (*proto_t) (const CHAR *, const CHAR *);
|
|
|
|
IMPL (STRCMP, 1)
|
|
|
|
static void
|
|
do_one_test (json_ctx_t *json_ctx, impl_t *impl,
|
|
const CHAR *s1, const CHAR *s2,
|
|
int exp_result)
|
|
{
|
|
size_t i, iters = INNER_LOOP_ITERS8 / 2;
|
|
timing_t start, stop, cur;
|
|
|
|
TIMING_NOW (start);
|
|
for (i = 0; i < iters; ++i)
|
|
{
|
|
CALL (impl, s1, s2);
|
|
}
|
|
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 align1, size_t align2, size_t len,
|
|
int max_char, int exp_result, int at_end)
|
|
{
|
|
size_t i;
|
|
|
|
CHAR *s1, *s2;
|
|
|
|
if (len == 0)
|
|
return;
|
|
|
|
align1 &= ~(CHARBYTES - 1);
|
|
align2 &= ~(CHARBYTES - 1);
|
|
|
|
align1 &= (getpagesize () - 1);
|
|
if (align1 + (len + 1) * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
align2 &= (getpagesize () - 1);
|
|
if (align2 + (len + 1) * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
/* Put them close to the end of page. */
|
|
if (at_end)
|
|
{
|
|
i = align1 + CHARBYTES * (len + 2);
|
|
align1 = ((page_size - i) / 16 * 16) + align1;
|
|
i = align2 + CHARBYTES * (len + 2);
|
|
align2 = ((page_size - i) / 16 * 16) + align2;
|
|
}
|
|
|
|
s1 = (CHAR *)(buf1 + align1);
|
|
s2 = (CHAR *)(buf2 + align2);
|
|
|
|
for (i = 0; i < len; i++)
|
|
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
|
|
|
|
s1[len] = s2[len] = 0;
|
|
s1[len + 1] = 23;
|
|
s2[len + 1] = 24 + exp_result;
|
|
s2[len - 1] -= exp_result;
|
|
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "length", (double)len);
|
|
json_attr_uint (json_ctx, "align1", (double)align1);
|
|
json_attr_uint (json_ctx, "align2", (double)align2);
|
|
json_array_begin (json_ctx, "timings");
|
|
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (json_ctx, impl, s1, s2, exp_result);
|
|
|
|
json_array_end (json_ctx);
|
|
json_element_object_end (json_ctx);
|
|
}
|
|
|
|
static void
|
|
do_one_test_page_boundary (json_ctx_t *json_ctx, CHAR *s1, CHAR *s2,
|
|
size_t align1, size_t align2, size_t len,
|
|
int exp_result)
|
|
{
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "length", (double) len);
|
|
json_attr_uint (json_ctx, "align1", (double) align1);
|
|
json_attr_uint (json_ctx, "align2", (double) align2);
|
|
json_array_begin (json_ctx, "timings");
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (json_ctx, impl, s1, s2, exp_result);
|
|
json_array_end (json_ctx);
|
|
json_element_object_end (json_ctx);
|
|
}
|
|
|
|
static void
|
|
do_test_page_boundary (json_ctx_t *json_ctx)
|
|
{
|
|
/* To trigger bug 25933, we need a size that is equal to the vector
|
|
length times 4. In the case of AVX2 for Intel, we need 32 * 4. We
|
|
make this test generic and run it for all architectures as additional
|
|
boundary testing for such related algorithms. */
|
|
size_t size = 32 * 4;
|
|
size_t len;
|
|
CHAR *s1 = (CHAR *) (buf1 + (BUF1PAGES - 1) * page_size);
|
|
CHAR *s2 = (CHAR *) (buf2 + (BUF1PAGES - 1) * page_size);
|
|
int exp_result;
|
|
|
|
memset (s1, 'a', page_size);
|
|
memset (s2, 'a', page_size);
|
|
|
|
s1[(page_size / CHARBYTES) - 1] = (CHAR) 0;
|
|
s2[(page_size / CHARBYTES) - 1] = (CHAR) 0;
|
|
|
|
/* Iterate over a size that is just below where we expect the bug to
|
|
trigger up to the size we expect will trigger the bug e.g. [99-128].
|
|
Likewise iterate the start of two strings between 30 and 31 bytes
|
|
away from the boundary to simulate alignment changes. */
|
|
for (size_t s = 99; s <= size; s++)
|
|
for (size_t s1a = 30; s1a < 32; s1a++)
|
|
for (size_t s2a = 30; s2a < 32; s2a++)
|
|
{
|
|
size_t align1 = (page_size / CHARBYTES - s) - s1a;
|
|
size_t align2 = (page_size / CHARBYTES - s) - s2a;
|
|
CHAR *s1p = s1 + align1;
|
|
CHAR *s2p = s2 + align2;
|
|
len = (page_size / CHARBYTES) - 1 - align1;
|
|
exp_result = STRCMP (s1p, s2p);
|
|
do_one_test_page_boundary (json_ctx, s1p, s2p, align1, align2,
|
|
len, exp_result);
|
|
}
|
|
}
|
|
|
|
int
|
|
test_main (void)
|
|
{
|
|
json_ctx_t json_ctx;
|
|
size_t i, j, k;
|
|
size_t pg_sz = getpagesize ();
|
|
|
|
test_init ();
|
|
|
|
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", "default");
|
|
|
|
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 (k = 0; k < 2; ++k)
|
|
{
|
|
for (i = 1; i < 32; ++i)
|
|
{
|
|
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1, k);
|
|
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1, k);
|
|
}
|
|
|
|
for (i = 1; i <= 8192;)
|
|
{
|
|
/* No page crosses. */
|
|
do_test (&json_ctx, 0, 0, i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, i * CHARBYTES, 0, i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, 0, i * CHARBYTES, i, MIDCHAR, 0, k);
|
|
|
|
/* False page crosses. */
|
|
do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, MIDCHAR, 0,
|
|
k);
|
|
do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, MIDCHAR, 0,
|
|
k);
|
|
|
|
do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, MIDCHAR, 0, k);
|
|
|
|
/* Real page cross. */
|
|
for (j = 16; j < 128; j += 16)
|
|
{
|
|
do_test (&json_ctx, pg_sz - j, 0, i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, 0, pg_sz - j, i, MIDCHAR, 0, k);
|
|
|
|
do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, MIDCHAR, 0, k);
|
|
}
|
|
|
|
if (i < 32)
|
|
{
|
|
++i;
|
|
}
|
|
else if (i < 160)
|
|
{
|
|
i += 8;
|
|
}
|
|
else if (i < 512)
|
|
{
|
|
i += 32;
|
|
}
|
|
else
|
|
{
|
|
i *= 2;
|
|
}
|
|
}
|
|
|
|
for (i = 1; i < 10 + CHARBYTESLOG; ++i)
|
|
{
|
|
do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0, k);
|
|
do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0, k);
|
|
do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1, k);
|
|
do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1, k);
|
|
do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1, k);
|
|
do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1, k);
|
|
do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1, k);
|
|
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i,
|
|
LARGECHAR, 1, k);
|
|
}
|
|
|
|
for (i = 1; i < 8; ++i)
|
|
{
|
|
do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i,
|
|
MIDCHAR, 0, k);
|
|
do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i,
|
|
LARGECHAR, 0, k);
|
|
do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i,
|
|
MIDCHAR, 1, k);
|
|
do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i,
|
|
LARGECHAR, 1, k);
|
|
do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i,
|
|
MIDCHAR, -1, k);
|
|
do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i,
|
|
LARGECHAR, -1, k);
|
|
}
|
|
}
|
|
do_test_page_boundary (&json_ctx);
|
|
|
|
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>
|
|
|
|
#ifndef WIDE
|
|
# undef STRCMP
|
|
# define STRCMP generic_strcmp
|
|
# include <string/strcmp.c>
|
|
#endif
|