80e6c6554b
Add more small and medium sized tests for strcmp and strncmp. As well for strcmp add option for more direct control of alignment. Previously alignment was being pushed to the end of the page. While this is the most difficult case to implement, it is far from the common case and so shouldn't be the only benchmark. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
459 lines
13 KiB
C
459 lines
13 KiB
C
/* Measure strncmp functions.
|
|
Copyright (C) 2013-2022 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 "wcsncmp"
|
|
#else
|
|
# define TEST_NAME "strncmp"
|
|
#endif /* !WIDE */
|
|
#include "bench-string.h"
|
|
#include "json-lib.h"
|
|
|
|
#ifdef WIDE
|
|
# define L(str) L##str
|
|
# define STRDUP wcsdup
|
|
# define SIMPLE_STRNCMP simple_wcsncmp
|
|
|
|
/* Wcsncmp uses signed semantics for comparison, not unsigned.
|
|
Avoid using substraction since possible overflow. */
|
|
int
|
|
simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
|
|
{
|
|
wchar_t c1, c2;
|
|
|
|
while (n--)
|
|
{
|
|
c1 = *s1++;
|
|
c2 = *s2++;
|
|
if (c1 == L ('\0') || c1 != c2)
|
|
return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
# define L(str) str
|
|
# define STRDUP strdup
|
|
# define SIMPLE_STRNCMP simple_strncmp
|
|
|
|
/* Strncmp uses unsigned semantics for comparison. */
|
|
int
|
|
simple_strncmp (const char *s1, const char *s2, size_t n)
|
|
{
|
|
int ret = 0;
|
|
|
|
while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
|
|
&& *s1++);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* !WIDE */
|
|
|
|
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
|
|
|
|
IMPL (SIMPLE_STRNCMP, 0)
|
|
IMPL (STRNCMP, 1)
|
|
|
|
|
|
static void
|
|
do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1, const CHAR
|
|
*s2, size_t n, int exp_result)
|
|
{
|
|
size_t i, iters = INNER_LOOP_ITERS8;
|
|
timing_t start, stop, cur;
|
|
|
|
TIMING_NOW (start);
|
|
for (i = 0; i < iters; ++i)
|
|
{
|
|
CALL (impl, s1, s2, n);
|
|
}
|
|
TIMING_NOW (stop);
|
|
|
|
TIMING_DIFF (cur, start, stop);
|
|
|
|
json_element_double (json_ctx, (double) cur / (double) iters);
|
|
}
|
|
|
|
static void
|
|
do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
|
|
size_t n, int max_char, int exp_result)
|
|
{
|
|
size_t i, align_n;
|
|
CHAR *s1, *s2;
|
|
|
|
align1 &= 15;
|
|
align2 &= 15;
|
|
align_n = (page_size - n * CHARBYTES) & 15;
|
|
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "strlen", (double) len);
|
|
json_attr_uint (json_ctx, "len", (double) n);
|
|
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)
|
|
{
|
|
alloc_bufs ();
|
|
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
|
|
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
|
|
|
|
if (align1 < align_n)
|
|
s1 = (CHAR *) ((char *) s1 - (align_n - align1));
|
|
|
|
if (align2 < align_n)
|
|
s2 = (CHAR *) ((char *) s2 - (align_n - align2));
|
|
|
|
for (i = 0; i < n; i++)
|
|
s1[i] = s2[i] = 1 + 23 * i % max_char;
|
|
|
|
if (len < n)
|
|
{
|
|
s1[len] = 0;
|
|
s2[len] = 0;
|
|
if (exp_result < 0)
|
|
s2[len] = 32;
|
|
else if (exp_result > 0)
|
|
s1[len] = 64;
|
|
}
|
|
|
|
do_one_test (json_ctx, impl, s1, s2, n, exp_result);
|
|
}
|
|
|
|
json_array_end (json_ctx);
|
|
json_element_object_end (json_ctx);
|
|
}
|
|
|
|
static void
|
|
do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t
|
|
n, int max_char, int exp_result)
|
|
{
|
|
size_t i;
|
|
CHAR *s1, *s2;
|
|
|
|
if (n == 0)
|
|
return;
|
|
|
|
align1 &= getpagesize () - 1;
|
|
if (align1 + (n + 1) * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
align2 &= getpagesize () - 1;
|
|
if (align2 + (n + 1) * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "strlen", (double)len);
|
|
json_attr_uint (json_ctx, "len", (double)n);
|
|
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)
|
|
{
|
|
alloc_bufs ();
|
|
s1 = (CHAR *)(buf1 + align1);
|
|
s2 = (CHAR *)(buf2 + align2);
|
|
|
|
for (i = 0; i < n; i++)
|
|
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
|
|
|
|
s1[n] = 24 + exp_result;
|
|
s2[n] = 23;
|
|
s1[len] = 0;
|
|
s2[len] = 0;
|
|
if (exp_result < 0)
|
|
s2[len] = 32;
|
|
else if (exp_result > 0)
|
|
s1[len] = 64;
|
|
if (len >= n)
|
|
s2[n - 1] -= exp_result;
|
|
|
|
do_one_test (json_ctx, impl, s1, s2, n, 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,
|
|
size_t n, int exp_result)
|
|
{
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "strlen", (double) len);
|
|
json_attr_uint (json_ctx, "len", (double) n);
|
|
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, n, 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;
|
|
|
|
/* 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 = SIMPLE_STRNCMP (s1p, s2p, s);
|
|
do_one_test_page_boundary (json_ctx, s1p, s2p, align1, align2,
|
|
len, s, exp_result);
|
|
}
|
|
}
|
|
|
|
static void
|
|
do_one_test_page (json_ctx_t *json_ctx, size_t offset1, size_t offset2,
|
|
CHAR *s2)
|
|
{
|
|
CHAR *s1;
|
|
int exp_result;
|
|
|
|
if (offset1 * CHARBYTES >= page_size
|
|
|| offset2 * CHARBYTES >= page_size)
|
|
return;
|
|
|
|
s1 = (CHAR *) buf1;
|
|
s1 += offset1;
|
|
s2 += offset2;
|
|
|
|
size_t len = (page_size / CHARBYTES) - offset1;
|
|
|
|
exp_result= *s1;
|
|
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "strlen", (double) len);
|
|
json_attr_uint (json_ctx, "len", (double) page_size);
|
|
json_attr_uint (json_ctx, "align1", (double) offset1);
|
|
json_attr_uint (json_ctx, "align2", (double) offset2);
|
|
json_array_begin (json_ctx, "timings");
|
|
{
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (json_ctx, impl, s1, s2, page_size, -exp_result);
|
|
}
|
|
json_array_end (json_ctx);
|
|
json_element_object_end (json_ctx);
|
|
|
|
json_element_object_begin (json_ctx);
|
|
json_attr_uint (json_ctx, "strlen", (double) len);
|
|
json_attr_uint (json_ctx, "len", (double) page_size);
|
|
json_attr_uint (json_ctx, "align1", (double) offset1);
|
|
json_attr_uint (json_ctx, "align2", (double) offset2);
|
|
json_array_begin (json_ctx, "timings");
|
|
{
|
|
FOR_EACH_IMPL (impl, 0)
|
|
do_one_test (json_ctx, impl, s1, s2, page_size, exp_result);
|
|
}
|
|
json_array_end (json_ctx);
|
|
json_element_object_end (json_ctx);
|
|
}
|
|
|
|
static void
|
|
do_test_page (json_ctx_t *json_ctx)
|
|
{
|
|
size_t i;
|
|
CHAR *s1, *s2;
|
|
|
|
s1 = (CHAR *) buf1;
|
|
/* Fill buf1 with 23. */
|
|
for (i = 0; i < (page_size / CHARBYTES) - 1; i++)
|
|
s1[i] = 23;
|
|
s1[i] = 0;
|
|
|
|
/* Make a copy of buf1. */
|
|
s2 = STRDUP (s1);
|
|
|
|
/* Test should terminate within the page boundary. */
|
|
for (i = 0; i < (108 / CHARBYTES); ++i)
|
|
do_one_test_page (json_ctx, ((page_size - 108) / CHARBYTES) + i,
|
|
((page_size - 1460) / CHARBYTES), s2);
|
|
|
|
free (s2);
|
|
}
|
|
|
|
int
|
|
test_main (void)
|
|
{
|
|
json_ctx_t json_ctx;
|
|
size_t i, j, len;
|
|
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 (i = 0; i < 16; ++i)
|
|
{
|
|
do_test (&json_ctx, 0, 0, 8, i, 127, 0);
|
|
do_test (&json_ctx, 0, 0, 8, i, 127, -1);
|
|
do_test (&json_ctx, 0, 0, 8, i, 127, 1);
|
|
do_test (&json_ctx, i, i, 8, i, 127, 0);
|
|
do_test (&json_ctx, i, i, 8, i, 127, 1);
|
|
do_test (&json_ctx, i, i, 8, i, 127, -1);
|
|
do_test (&json_ctx, i, 2 * i, 8, i, 127, 0);
|
|
do_test (&json_ctx, 2 * i, i, 8, i, 127, 1);
|
|
do_test (&json_ctx, i, 3 * i, 8, i, 127, -1);
|
|
do_test (&json_ctx, 0, 0, 8, i, 255, 0);
|
|
do_test (&json_ctx, 0, 0, 8, i, 255, -1);
|
|
do_test (&json_ctx, 0, 0, 8, i, 255, 1);
|
|
do_test (&json_ctx, i, i, 8, i, 255, 0);
|
|
do_test (&json_ctx, i, i, 8, i, 255, 1);
|
|
do_test (&json_ctx, i, i, 8, i, 255, -1);
|
|
do_test (&json_ctx, i, 2 * i, 8, i, 255, 0);
|
|
do_test (&json_ctx, 2 * i, i, 8, i, 255, 1);
|
|
do_test (&json_ctx, i, 3 * i, 8, i, 255, -1);
|
|
}
|
|
|
|
for (len = 0; len <= 128; len += 64)
|
|
{
|
|
for (i = 1; i <= 8192;)
|
|
{
|
|
/* No page crosses. */
|
|
do_test (&json_ctx, 0, 0, i, i + len, 127, 0);
|
|
do_test (&json_ctx, i * CHARBYTES, 0, i, i + len, 127, 0);
|
|
do_test (&json_ctx, 0, i * CHARBYTES, i, i + len, 127, 0);
|
|
|
|
/* False page crosses. */
|
|
do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, i + len,
|
|
127, 0);
|
|
do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, i + len,
|
|
127, 0);
|
|
|
|
do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, i + len, 127,
|
|
0);
|
|
do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, i + len, 127,
|
|
0);
|
|
|
|
/* Real page cross. */
|
|
for (j = 16; j < 128; j += 16)
|
|
{
|
|
do_test (&json_ctx, pg_sz - j, 0, i, i + len, 127, 0);
|
|
do_test (&json_ctx, 0, pg_sz - j, i, i + len, 127, 0);
|
|
|
|
do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, i + len,
|
|
127, 0);
|
|
do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, i + len,
|
|
127, 0);
|
|
}
|
|
|
|
if (i < 32)
|
|
{
|
|
++i;
|
|
}
|
|
else if (i < 160)
|
|
{
|
|
i += 8;
|
|
}
|
|
else if (i < 256)
|
|
{
|
|
i += 32;
|
|
}
|
|
else
|
|
{
|
|
i *= 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 1; i < 8; ++i)
|
|
{
|
|
do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 0);
|
|
do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 1);
|
|
do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, -1);
|
|
do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, 0);
|
|
do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, 1);
|
|
do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 255, -1);
|
|
do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
|
|
do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
|
|
do_test (&json_ctx, 2 * i, i, 8 << i, 16 << i, 255, 0);
|
|
do_test (&json_ctx, 2 * i, i, 8 << i, 16 << i, 255, 1);
|
|
}
|
|
|
|
do_test_limit (&json_ctx, 4, 0, 21, 20, 127, 0);
|
|
do_test_limit (&json_ctx, 0, 4, 21, 20, 127, 0);
|
|
do_test_limit (&json_ctx, 8, 0, 25, 24, 127, 0);
|
|
do_test_limit (&json_ctx, 0, 8, 25, 24, 127, 0);
|
|
|
|
for (i = 0; i < 8; ++i)
|
|
{
|
|
do_test_limit (&json_ctx, 0, 0, 17 - i, 16 - i, 127, 0);
|
|
do_test_limit (&json_ctx, 0, 0, 17 - i, 16 - i, 255, 0);
|
|
do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, 0);
|
|
do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, 1);
|
|
do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 127, -1);
|
|
do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, 0);
|
|
do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, 1);
|
|
do_test_limit (&json_ctx, 0, 0, 15 - i, 16 - i, 255, -1);
|
|
}
|
|
|
|
do_test_page_boundary (&json_ctx);
|
|
do_test_page (&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>
|