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glibc/string/test-memmove.c
Siddhesh Poyarekar 67e3b0c63c tests/string: Drop simple/stupid/builtin tests 
In most cases the simple/stupid/builtin functions were in there to
benchmark optimized implementations against.  Only in some cases the
functions are used to check expected results.

Remove these tests from IMPL() and only keep them in wherever they're
used for a specific purpose, e.g. to generate expected results.

This improves timing of `make subdirs=string` by over a minute and a
half (over 15%) on a Whiskey Lake laptop.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Noah Goldstein <libc-alpha@sourceware.org>
2022-04-06 20:53:24 +05:30

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/* Test and measure memmove functions.
Copyright (C) 1999-2022 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 TEST_BCOPY
# define TEST_NAME "bcopy"
#else
# define TEST_NAME "memmove"
#endif
#include "test-string.h"
#include <support/test-driver.h>
char *simple_memmove (char *, const char *, size_t);
#ifdef TEST_BCOPY
typedef void (*proto_t) (const char *, char *, size_t);
IMPL (bcopy, 1)
/* Naive implementation to verify results. */
void
simple_bcopy (const char *src, char *dst, size_t n)
{
simple_memmove (dst, src, n);
}
#else
typedef char *(*proto_t) (char *, const char *, size_t);
IMPL (memmove, 1)
#endif
/* Naive implementation to verify results. */
char *
inhibit_loop_to_libcall
simple_memmove (char *dst, const char *src, size_t n)
{
char *ret = dst;
if (src < dst)
{
dst += n;
src += n;
while (n--)
*--dst = *--src;
}
else
while (n--)
*dst++ = *src++;
return ret;
}
static void
do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
size_t len)
{
/* This also clears the destination buffer set by the previous run. */
memcpy (src, orig_src, len);
#ifdef TEST_BCOPY
CALL (impl, src, dst, len);
#else
char *res;
res = CALL (impl, dst, src, len);
if (res != dst)
{
error (0, 0, "Wrong result in function %s %p %p", impl->name,
res, dst);
ret = 1;
return;
}
#endif
if (memcmp (dst, orig_src, len) != 0)
{
error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
impl->name, dst, src);
ret = 1;
return;
}
}
static void
do_test (size_t align1, size_t align2, size_t len)
{
size_t i, j;
char *s1, *s2;
align1 &= (getpagesize() - 1);
if (align1 + len >= page_size)
return;
align2 &= (getpagesize() - 1);
if (align2 + len >= page_size)
return;
s1 = (char *) (buf1 + align1);
s2 = (char *) (buf2 + align2);
for (i = 0, j = 1; i < len; i++, j += 23)
s1[i] = j;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
}
static void
do_random_tests (void)
{
size_t i, n, align1, align2, len, size;
size_t srcstart, srcend, dststart, dstend;
int c;
unsigned char *p1, *p2;
#ifndef TEST_BCOPY
unsigned char *res;
#endif
for (n = 0; n < ITERATIONS; n++)
{
if ((random () & 255) == 0)
size = 65536;
else
size = 512;
if (size > page_size)
size = page_size;
if ((random () & 3) == 0)
{
len = random () & (size - 1);
align1 = size - len - (random () & 31);
align2 = size - len - (random () & 31);
if (align1 > size)
align1 = 0;
if (align2 > size)
align2 = 0;
}
else
{
align1 = random () & (size / 2 - 1);
align2 = random () & (size / 2 - 1);
len = random () & (size - 1);
if (align1 + len > size)
align1 = size - len;
if (align2 + len > size)
align2 = size - len;
}
p1 = buf1 + page_size - size;
p2 = buf2 + page_size - size;
c = random () & 255;
srcend = align1 + len + 256;
if (srcend > size)
srcend = size;
if (align1 > 256)
srcstart = align1 - 256;
else
srcstart = 0;
for (i = srcstart; i < srcend; ++i)
p1[i] = random () & 255;
dstend = align2 + len + 256;
if (dstend > size)
dstend = size;
if (align2 > 256)
dststart = align2 - 256;
else
dststart = 0;
FOR_EACH_IMPL (impl, 1)
{
memset (p2 + dststart, c, dstend - dststart);
memcpy (p2 + srcstart, p1 + srcstart, srcend - srcstart);
#ifdef TEST_BCOPY
CALL (impl, (char *) (p2 + align1), (char *) (p2 + align2), len);
#else
res = (unsigned char *) CALL (impl,
(char *) (p2 + align2),
(char *) (p2 + align1), len);
if (res != p2 + align2)
{
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
n, impl->name, align1, align2, len, res, p2 + align2);
ret = 1;
}
#endif
if (memcmp (p1 + align1, p2 + align2, len))
{
error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
}
for (i = dststart; i < dstend; ++i)
{
if (i >= align2 && i < align2 + len)
{
i = align2 + len - 1;
continue;
}
if (i >= srcstart && i < srcend)
{
i = srcend - 1;
continue;
}
if (p2[i] != c)
{
error (0, 0, "Iteration %zd - garbage in memset area, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
}
if (srcstart < align2
&& memcmp (p2 + srcstart, p1 + srcstart,
(srcend > align2 ? align2 : srcend) - srcstart))
{
error (0, 0, "Iteration %zd - garbage before dst, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
i = srcstart > align2 + len ? srcstart : align2 + len;
if (srcend > align2 + len
&& memcmp (p2 + i, p1 + i, srcend - i))
{
error (0, 0, "Iteration %zd - garbage after dst, %s (%zd, %zd, %zd)",
n, impl->name, align1, align2, len);
ret = 1;
break;
}
}
}
}
static void
do_test2 (size_t offset)
{
size_t size = 0x20000000;
uint32_t * large_buf;
large_buf = mmap ((void*) 0x70000000, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (large_buf == MAP_FAILED)
error (EXIT_UNSUPPORTED, errno, "Large mmap failed");
if ((uintptr_t) large_buf > 0x80000000 - 128
|| 0x80000000 - (uintptr_t) large_buf > 0x20000000)
{
error (0, 0, "Large mmap allocated improperly");
ret = EXIT_UNSUPPORTED;
munmap ((void *) large_buf, size);
return;
}
size_t bytes_move = 0x80000000 - (uintptr_t) large_buf;
if (bytes_move + offset * sizeof (uint32_t) > size)
{
munmap ((void *) large_buf, size);
return;
}
size_t arr_size = bytes_move / sizeof (uint32_t);
size_t i;
size_t repeats;
uint32_t * src = large_buf;
uint32_t * dst = &large_buf[offset];
for (repeats = 0; repeats < 2; ++repeats)
{
FOR_EACH_IMPL (impl, 0)
{
for (i = 0; i < arr_size; i++)
src[i] = (uint32_t) i;
#ifdef TEST_BCOPY
CALL (impl, (char *) src, (char *) dst, bytes_move);
#else
CALL (impl, (char *) dst, (char *) src, bytes_move);
#endif
for (i = 0; i < arr_size; i++)
{
if (dst[i] != (uint32_t) i)
{
error (0, 0,
"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
impl->name, dst, src, i);
ret = 1;
munmap ((void *) large_buf, size);
return;
}
}
}
src = dst;
dst = large_buf;
}
munmap ((void *) large_buf, size);
}
static void
do_test3 (size_t bytes_move, size_t offset)
{
size_t size = bytes_move * 3;
uint32_t *buf;
buf = mmap (NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buf == MAP_FAILED)
error (EXIT_UNSUPPORTED, errno, "mmap failed");
size_t arr_size = bytes_move / sizeof (uint32_t);
size_t i;
FOR_EACH_IMPL (impl, 0)
{
for (i = 0; i < arr_size; i++)
buf[i] = (uint32_t) i;
uint32_t *dst = &buf[arr_size + offset];
#ifdef TEST_BCOPY
CALL (impl, (char *) buf, (char *) dst, bytes_move);
#else
CALL (impl, (char *) dst, (char *) buf, bytes_move);
#endif
for (i = 0; i < arr_size; i++)
{
if (dst[i] != (uint32_t) i)
{
error (0, 0,
"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
impl->name, dst, buf, i);
ret = 1;
break;
}
}
}
munmap ((void *) buf, size);
}
static void
do_test4 (size_t bytes_move, size_t offset1, size_t offset2)
{
size_t size, repeats, i;
uint8_t *buf, *dst, *src;
size = bytes_move + MAX(offset1, offset2);
buf = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buf == MAP_FAILED)
error (EXIT_UNSUPPORTED, errno, "mmap failed");
dst = &buf[offset1];
src = &buf[offset2];
for (repeats = 0; repeats < 2; ++repeats)
{
FOR_EACH_IMPL (impl, 0)
{
for (i = 0; i < bytes_move; i++)
src[i] = (uint8_t) i;
#ifdef TEST_BCOPY
CALL (impl, (char *) src, (char *) dst, bytes_move);
#else
CALL (impl, (char *) dst, (char *) src, bytes_move);
#endif
for (i = 0; i < bytes_move; i++)
{
if (dst[i] != (uint8_t) i)
{
error (0, 0,
"Wrong result in function %s dst \"%p\" src \"%p\" offset \"%zd\"",
impl->name, dst, buf, i);
ret = 1;
break;
}
}
}
dst = &buf[offset2];
src = &buf[offset1];
}
munmap ((void *) buf, size);
}
int
test_main (void)
{
size_t i;
test_init ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 0; i < 14; ++i)
{
do_test (0, 32, 1 << i);
do_test (32, 0, 1 << i);
do_test (0, i, 1 << i);
do_test (i, 0, 1 << i);
}
for (i = 0; i < 32; ++i)
{
do_test (0, 32, i);
do_test (32, 0, i);
do_test (0, i, i);
do_test (i, 0, i);
}
for (i = 3; i < 32; ++i)
{
if ((i & (i - 1)) == 0)
continue;
do_test (0, 32, 16 * i);
do_test (32, 0, 16 * i);
do_test (0, i, 16 * i);
do_test (i, 0, 16 * i);
}
do_random_tests ();
do_test2 (0);
do_test2 (33);
do_test2 (0x200000 - 1);
do_test2 (0x200000);
do_test2 (0x200000 + 1);
do_test2 (0x1000000 - 1);
do_test2 (0x1000000);
do_test2 (0x1000000 + 1);
do_test2 (0x4000000 - 1);
do_test2 (0x4000000);
do_test2 (0x4000000 + 1);
/* Copy 16KB data. */
do_test3 (16384, 3);
for (i = 4096; i <= 16384; i <<= 1)
{
do_test4 (i, 0, i);
do_test4 (i, 0, i - 1);
do_test4 (i, 0, i + 1);
do_test4 (i, 63, i + 63);
do_test4 (i, 63, i + 64);
do_test4 (i, 63, i);
do_test4 (i, 0, 1);
do_test4 (i, 0, 15);
do_test4 (i, 0, 31);
do_test4 (i, 0, 63);
do_test4 (i, 0, 64);
do_test4 (i, 0, 65);
do_test4 (i, 0, 127);
do_test4 (i, 0, 129);
}
return ret;
}
#include <support/test-driver.c>
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