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/* Measure strcmp and wcscmp functions.
Copyright (C) 2013-2020 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 TEST_MAIN
#ifdef WIDE
# define TEST_NAME "wcscmp"
#else
# define TEST_NAME "strcmp"
#endif
#include "bench-string.h"
#ifdef WIDE
# define L(str) L##str
# define SIMPLE_STRCMP simple_wcscmp
# define CHARBYTESLOG 2
# define MIDCHAR 0x7fffffff
# define LARGECHAR 0xfffffffe
/* Wcscmp uses signed semantics for comparison, not unsigned */
/* Avoid using substraction since possible overflow */
int
simple_wcscmp (const wchar_t *s1, const wchar_t *s2)
{
wchar_t c1, c2;
do
{
c1 = *s1++;
c2 = *s2++;
if (c2 == L'\0')
return c1 - c2;
}
while (c1 == c2);
return c1 < c2 ? -1 : 1;
}
#else
# include <limits.h>
# define L(str) str
# define SIMPLE_STRCMP simple_strcmp
# define CHARBYTESLOG 0
# define MIDCHAR 0x7f
# define LARGECHAR 0xfe
/* Strcmp uses unsigned semantics for comparison. */
int
simple_strcmp (const char *s1, const char *s2)
{
int ret;
while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);
return ret;
}
#endif
# include "json-lib.h"
typedef int (*proto_t) (const CHAR *, const CHAR *);
IMPL (SIMPLE_STRCMP, 1)
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;
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)
{
size_t i;
CHAR *s1, *s2;
if (len == 0)
return;
align1 &= 63;
if (align1 + (len + 1) * CHARBYTES >= page_size)
return;
align2 &= 63;
if (align2 + (len + 1) * CHARBYTES >= page_size)
return;
/* Put them close to the end of page. */
i = align1 + CHARBYTES * (len + 2);
s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1);
i = align2 + CHARBYTES * (len + 2);
s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + 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);
}
int
test_main (void)
{
json_ctx_t json_ctx;
size_t i;
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 = 1; i < 32; ++i)
{
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0);
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1);
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1);
}
for (i = 1; i < 10 + CHARBYTESLOG; ++i)
{
do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0);
do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0);
do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1);
do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1);
do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1);
do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1);
do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1);
do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1);
}
for (i = 1; i < 8; ++i)
{
do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0);
do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0);
do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1);
do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1);
do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1);
do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1);
}
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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