mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 12:41:05 +00:00
d1c3c0e4fe
Instead of benchmarking slow byte oriented loops, include the optimized generic strcmp/strncmp implementation. Adjust iteration count to reduce benchmark time. 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_ITERS;
|
|
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
|