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/* Measure STRLEN functions.
Copyright (C) 2013-2024 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
#ifndef WIDE
# define TEST_NAME "strlen"
#else
# define TEST_NAME "wcslen"
# define generic_strlen generic_wcslen
# define memchr_strlen wcschr_wcslen
#endif
#include "bench-string.h"
#include "json-lib.h"
typedef size_t (*proto_t) (const CHAR *);
size_t generic_strlen (const CHAR *);
size_t memchr_strlen (const CHAR *);
IMPL (memchr_strlen, 0)
IMPL (generic_strlen, 0)
size_t
memchr_strlen (const CHAR *p)
{
return (const CHAR *)MEMCHR (p, 0, PTRDIFF_MAX) - p;
}
IMPL (STRLEN, 1)
static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, size_t exp_len)
{
size_t len = CALL (impl, s), i, iters = INNER_LOOP_ITERS_LARGE;
timing_t start, stop, cur;
if (len != exp_len)
{
error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
len, exp_len);
ret = 1;
return;
}
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
CALL (impl, s);
}
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 align, size_t len)
{
size_t i;
align &= 63;
if (align + sizeof (CHAR) * len >= page_size)
return;
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", len);
json_attr_uint (json_ctx, "alignment", align);
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
{
CHAR *buf = (CHAR *) (buf1);
for (i = 0; i < len; ++i)
buf[align + i] = 1 + 11111 * i % MAX_CHAR;
buf[align + len] = 0;
do_one_test (json_ctx, impl, (CHAR *) (buf + align), len);
alloc_bufs ();
}
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", "");
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");
/* Checking with only 4 * N alignments for wcslen, other alignments are wrong for wchar_t type arrays*/
for (i = 1; i < 8; ++i)
{
do_test (&json_ctx, sizeof (CHAR) * i, i);
do_test (&json_ctx, 0, i);
}
for (i = 2; i <= 12; ++i)
{
do_test (&json_ctx, 0, 1 << i);
do_test (&json_ctx, sizeof (CHAR) * 7, 1 << i);
do_test (&json_ctx, sizeof (CHAR) * i, 1 << i);
do_test (&json_ctx, sizeof (CHAR) * i, (size_t)((1 << i) / 1.5));
}
for (i = 0; i < 512; i += 32)
{
do_test (&json_ctx, 0, i / sizeof (CHAR));
}
for (i = 512; i < 1024; i += 64)
{
do_test (&json_ctx, 0, i / sizeof (CHAR));
}
for (i = 1024; i < 2048; i += 128)
{
do_test (&json_ctx, 0, i / sizeof (CHAR));
}
for (i = 2048; i < 4096; i += 256)
{
do_test (&json_ctx, 0, i / sizeof (CHAR));
}
for (i = 4096; i < 8192; i += 512)
{
do_test (&json_ctx, 0, i / sizeof (CHAR));
}
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>
#define libc_hidden_builtin_def(X)
#ifndef WIDE
# undef STRLEN
# define STRLEN generic_strlen
# include <string/strlen.c>
#else
# define WCSLEN generic_strlen
# include <wcsmbs/wcslen.c>
#endif
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