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glibc/string/test-memcmp.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 memcmp 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_MEMCMPEQ
# define TEST_NAME "__memcmpeq"
#elif defined WIDE
# define TEST_NAME "wmemcmp"
#else
# define TEST_NAME "memcmp"
#endif
#include "test-string.h"
#ifdef WIDE
# include <inttypes.h>
# include <wchar.h>
# define MEMCMP wmemcmp
# define MEMCPY wmemcpy
# define SIMPLE_MEMCMP simple_wmemcmp
# define CHAR wchar_t
# define UCHAR wchar_t
# define CHARBYTES 4
# define CHAR__MIN WCHAR_MIN
# define CHAR__MAX WCHAR_MAX
int
SIMPLE_MEMCMP (const wchar_t *s1, const wchar_t *s2, size_t n)
{
int ret = 0;
/* Warning!
wmemcmp has to use SIGNED comparison for elements.
memcmp has to use UNSIGNED comparison for elemnts.
*/
while (n-- && (ret = *s1 < *s2 ? -1 : *s1 == *s2 ? 0 : 1) == 0) {s1++; s2++;}
return ret;
}
#else
# include <limits.h>
# ifdef TEST_MEMCMPEQ
# define MEMCMP __memcmpeq
# define SIMPLE_MEMCMP simple_memcmpeq
# else
# define MEMCMP memcmp
# define SIMPLE_MEMCMP simple_memcmp
# endif
# define MEMCPY memcpy
# define CHAR char
# define MAX_CHAR 255
# define UCHAR unsigned char
# define CHARBYTES 1
# define CHAR__MIN CHAR_MIN
# define CHAR__MAX CHAR_MAX
int
SIMPLE_MEMCMP (const char *s1, const char *s2, size_t n)
{
int ret = 0;
while (n-- && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
return ret;
}
#endif
#ifndef BAD_RESULT
# define BAD_RESULT(result, expec) \
(((result) == 0 && (expec)) || ((result) < 0 && (expec) >= 0) || \
((result) > 0 && (expec) <= 0))
# endif
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
IMPL (MEMCMP, 1)
static int
check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len,
int exp_result)
{
int result = CALL (impl, s1, s2, len);
if (BAD_RESULT(result, exp_result))
{
error (0, 0, "Wrong result in function %s %d %d", impl->name,
result, exp_result);
ret = 1;
return -1;
}
return 0;
}
static void
do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t len,
int exp_result)
{
if (check_result (impl, s1, s2, len, exp_result) < 0)
return;
}
static void
do_test (size_t align1, size_t align2, size_t len, int exp_result)
{
size_t i;
CHAR *s1, *s2;
if (len == 0)
return;
align1 &= (4096 - CHARBYTES);
if (align1 + (len + 1) * CHARBYTES >= page_size)
return;
align2 &= (4096 - CHARBYTES);
if (align2 + (len + 1) * CHARBYTES >= page_size)
return;
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % CHAR__MAX;
s1[len] = align1;
s2[len] = align2;
s2[len - 1] -= exp_result;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, len, exp_result);
}
static void
do_random_tests (void)
{
size_t i, j, n, align1, align2, pos, len;
int result;
long r;
UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
for (n = 0; n < ITERATIONS; n++)
{
align1 = random () & 31;
if (random () & 1)
align2 = random () & 31;
else
align2 = align1 + (random () & 24);
pos = random () & 511;
j = align1;
if (align2 > j)
j = align2;
if (pos + j >= 512)
pos = 511 - j - (random () & 7);
len = random () & 511;
if (len + j >= 512)
len = 511 - j - (random () & 7);
j = len + align1 + 64;
if (j > 512) j = 512;
for (i = 0; i < j; ++i)
p1[i] = random () & 255;
for (i = 0; i < j; ++i)
p2[i] = random () & 255;
result = 0;
if (pos >= len)
MEMCPY ((CHAR *) p2 + align2, (const CHAR *) p1 + align1, len);
else
{
MEMCPY ((CHAR *) p2 + align2, (const CHAR *) p1 + align1, pos);
if (p2[align2 + pos] == p1[align1 + pos])
{
p2[align2 + pos] = random () & 255;
if (p2[align2 + pos] == p1[align1 + pos])
p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
}
if (p1[align1 + pos] < p2[align2 + pos])
result = -1;
else
result = 1;
}
FOR_EACH_IMPL (impl, 1)
{
r = CALL (impl, (CHAR *) p1 + align1, (const CHAR *) p2 + align2,
len);
if (BAD_RESULT(r, result))
{
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
n, impl->name, align1 * CHARBYTES & 63, align2 * CHARBYTES & 63, len, pos, r, result, p1, p2);
ret = 1;
}
}
}
}
static void
check1 (void)
{
CHAR s1[116], s2[116];
int n, exp_result;
s1[0] = -108;
s2[0] = -108;
s1[1] = 99;
s2[1] = 99;
s1[2] = -113;
s2[2] = -113;
s1[3] = 1;
s2[3] = 1;
s1[4] = 116;
s2[4] = 116;
s1[5] = 99;
s2[5] = 99;
s1[6] = -113;
s2[6] = -113;
s1[7] = 1;
s2[7] = 1;
s1[8] = 84;
s2[8] = 84;
s1[9] = 99;
s2[9] = 99;
s1[10] = -113;
s2[10] = -113;
s1[11] = 1;
s2[11] = 1;
s1[12] = 52;
s2[12] = 52;
s1[13] = 99;
s2[13] = 99;
s1[14] = -113;
s2[14] = -113;
s1[15] = 1;
s2[15] = 1;
s1[16] = -76;
s2[16] = -76;
s1[17] = -14;
s2[17] = -14;
s1[18] = -109;
s2[18] = -109;
s1[19] = 1;
s2[19] = 1;
s1[20] = -108;
s2[20] = -108;
s1[21] = -14;
s2[21] = -14;
s1[22] = -109;
s2[22] = -109;
s1[23] = 1;
s2[23] = 1;
s1[24] = 84;
s2[24] = 84;
s1[25] = -15;
s2[25] = -15;
s1[26] = -109;
s2[26] = -109;
s1[27] = 1;
s2[27] = 1;
s1[28] = 52;
s2[28] = 52;
s1[29] = -15;
s2[29] = -15;
s1[30] = -109;
s2[30] = -109;
s1[31] = 1;
s2[31] = 1;
s1[32] = 20;
s2[32] = 20;
s1[33] = -15;
s2[33] = -15;
s1[34] = -109;
s2[34] = -109;
s1[35] = 1;
s2[35] = 1;
s1[36] = 20;
s2[36] = 20;
s1[37] = -14;
s2[37] = -14;
s1[38] = -109;
s2[38] = -109;
s1[39] = 1;
s2[39] = 1;
s1[40] = 52;
s2[40] = 52;
s1[41] = -14;
s2[41] = -14;
s1[42] = -109;
s2[42] = -109;
s1[43] = 1;
s2[43] = 1;
s1[44] = 84;
s2[44] = 84;
s1[45] = -14;
s2[45] = -14;
s1[46] = -109;
s2[46] = -109;
s1[47] = 1;
s2[47] = 1;
s1[48] = 116;
s2[48] = 116;
s1[49] = -14;
s2[49] = -14;
s1[50] = -109;
s2[50] = -109;
s1[51] = 1;
s2[51] = 1;
s1[52] = 116;
s2[52] = 116;
s1[53] = -15;
s2[53] = -15;
s1[54] = -109;
s2[54] = -109;
s1[55] = 1;
s2[55] = 1;
s1[56] = -44;
s2[56] = -44;
s1[57] = -14;
s2[57] = -14;
s1[58] = -109;
s2[58] = -109;
s1[59] = 1;
s2[59] = 1;
s1[60] = -108;
s2[60] = -108;
s1[61] = -15;
s2[61] = -15;
s1[62] = -109;
s2[62] = -109;
s1[63] = 1;
s2[63] = 1;
s1[64] = -76;
s2[64] = -76;
s1[65] = -15;
s2[65] = -15;
s1[66] = -109;
s2[66] = -109;
s1[67] = 1;
s2[67] = 1;
s1[68] = -44;
s2[68] = -44;
s1[69] = -15;
s2[69] = -15;
s1[70] = -109;
s2[70] = -109;
s1[71] = 1;
s2[71] = 1;
s1[72] = -12;
s2[72] = -12;
s1[73] = -15;
s2[73] = -15;
s1[74] = -109;
s2[74] = -109;
s1[75] = 1;
s2[75] = 1;
s1[76] = -12;
s2[76] = -12;
s1[77] = -14;
s2[77] = -14;
s1[78] = -109;
s2[78] = -109;
s1[79] = 1;
s2[79] = 1;
s1[80] = 20;
s2[80] = -68;
s1[81] = -12;
s2[81] = 64;
s1[82] = -109;
s2[82] = -106;
s1[83] = 1;
s2[83] = 1;
s1[84] = -12;
s2[84] = -12;
s1[85] = -13;
s2[85] = -13;
s1[86] = -109;
s2[86] = -109;
s1[87] = 1;
s2[87] = 1;
s1[88] = -44;
s2[88] = -44;
s1[89] = -13;
s2[89] = -13;
s1[90] = -109;
s2[90] = -109;
s1[91] = 1;
s2[91] = 1;
s1[92] = -76;
s2[92] = -76;
s1[93] = -13;
s2[93] = -13;
s1[94] = -109;
s2[94] = -109;
s1[95] = 1;
s2[95] = 1;
s1[96] = -108;
s2[96] = -108;
s1[97] = -13;
s2[97] = -13;
s1[98] = -109;
s2[98] = -109;
s1[99] = 1;
s2[99] = 1;
s1[100] = 116;
s2[100] = 116;
s1[101] = CHAR__MIN;
s2[101] = CHAR__MAX;
s1[102] = -109;
s2[102] = -109;
s1[103] = 1;
s2[103] = 1;
s1[104] = 84;
s2[104] = 84;
s1[105] = -13;
s2[105] = -13;
s1[106] = -109;
s2[106] = -109;
s1[107] = 1;
s2[107] = 1;
s1[108] = 52;
s2[108] = 52;
s1[109] = -13;
s2[109] = -13;
s1[110] = -109;
s2[110] = -109;
s1[111] = 1;
s2[111] = 1;
s1[112] = CHAR__MAX;
s2[112] = CHAR__MIN;
s1[113] = -13;
s2[113] = -13;
s1[114] = -109;
s2[114] = -109;
s1[115] = 1;
s2[115] = 1;
n = 116;
for (size_t i = 0; i < n; i++)
for (size_t len = 0; len <= n - i; ++len)
{
exp_result = SIMPLE_MEMCMP (s1 + i, s2 + i, len);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1 + i, s2 + i, len, exp_result);
}
}
/* This test checks that memcmp doesn't overrun buffers. */
static void
check2 (void)
{
size_t max_length = page_size / sizeof (CHAR);
/* Initialize buf2 to the same values as buf1. The bug requires the
last compared byte to be different. */
memcpy (buf2, buf1, page_size);
((char *) buf2)[page_size - 1] ^= 0x11;
for (size_t length = 1; length < max_length; length++)
{
CHAR *s1 = (CHAR *) buf1 + max_length - length;
CHAR *s2 = (CHAR *) buf2 + max_length - length;
const int exp_result = SIMPLE_MEMCMP (s1, s2, length);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1, s2, length, exp_result);
}
}
int
test_main (void)
{
size_t i;
test_init ();
check1 ();
check2 ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 1; i < 32; ++i)
{
do_test (i * CHARBYTES, i * CHARBYTES, i, 0);
do_test (i * CHARBYTES, i * CHARBYTES, i, 1);
do_test (i * CHARBYTES, i * CHARBYTES, i, -1);
}
for (i = 0; i < 32; ++i)
{
do_test (0, 0, i, 0);
do_test (0, 0, i, 1);
do_test (0, 0, i, -1);
do_test (4096 - i, 0, i, 0);
do_test (4096 - i, 0, i, 1);
do_test (4096 - i, 0, i, -1);
do_test (4095, 0, i, 0);
do_test (4095, 0, i, 1);
do_test (4095, 0, i, -1);
do_test (4095, 4095, i, 0);
do_test (4095, 4095, i, 1);
do_test (4095, 4095, i, -1);
do_test (4000, 95, i, 0);
do_test (4000, 95, i, 1);
do_test (4000, 95, i, -1);
}
for (i = 33; i < 385; i += 32)
{
do_test (0, 0, i, 0);
do_test (0, 0, i, 1);
do_test (0, 0, i, -1);
do_test (i, 0, i, 0);
do_test (0, i, i, 1);
do_test (i, i, i, -1);
}
for (i = 1; i < 10; ++i)
{
do_test (0, 0, 2 << i, 0);
do_test (0, 0, 2 << i, 1);
do_test (0, 0, 2 << i, -1);
do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
do_test (0, 0, 16 << i, 0);
do_test (0, 0, 16 << i, 1);
do_test (0, 0, 16 << i, -1);
do_test (i, 0, 2 << i, 0);
do_test (0, i, 2 << i, 1);
do_test (i, i, 2 << i, -1);
do_test (i, 0, 16 << i, 0);
do_test (0, i, 16 << i, 1);
do_test (i, i, 16 << i, -1);
}
for (i = 1; i < 10; ++i)
{
do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1);
}
do_random_tests ();
return ret;
}
#include <support/test-driver.c>
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