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Add optimized x86-64 implementation of strnlen.

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While at it, beef up the test suite for strnlen and add performance
tests for it, too.
This commit is contained in:
Ulrich Drepper
2010-07-26 08:37:08 -07:00
parent 8e96b93aa7
commit 24fb0f88ed
6 changed files with 301 additions and 20 deletions
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31
string/tester.c
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@ -1,5 +1,5 @@
/* Tester for string functions.
Copyright (C) 1995-2001, 2003, 2005, 2008 Free Software Foundation, Inc.
Copyright (C) 1995-2001, 2003, 2005, 2008, 2010 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
@ -441,20 +441,21 @@ test_strnlen (void)
check (strnlen ("", 10) == 0, 1); /* Empty. */
check (strnlen ("a", 10) == 1, 2); /* Single char. */
check (strnlen ("abcd", 10) == 4, 3); /* Multiple chars. */
check (strnlen ("foo", (size_t)-1) == 3, 4); /* limits of n. */
check (strnlen ("foo", (size_t) -1) == 3, 4); /* limits of n. */
check (strnlen ("abcd", 0) == 0, 5); /* Restricted. */
check (strnlen ("abcd", 1) == 1, 6); /* Restricted. */
check (strnlen ("abcd", 2) == 2, 7); /* Restricted. */
check (strnlen ("abcd", 3) == 3, 8); /* Restricted. */
check (strnlen ("abcd", 4) == 4, 9); /* Restricted. */
{
char buf[4096];
int i;
char *p;
for (i=0; i < 0x100; i++)
{
p = (char *) ((unsigned long int)(buf + 0xff) & ~0xff) + i;
strcpy (p, "OK");
strcpy (p+3, "BAD/WRONG");
check (strnlen (p, 100) == 2, 5+i);
}
}
char buf[4096];
for (int i = 0; i < 0x100; ++i)
{
char *p = (char *) ((unsigned long int)(buf + 0xff) & ~0xff) + i;
strcpy (p, "OK");
strcpy (p + 3, "BAD/WRONG");
check (strnlen (p, 100) == 2, 10 + i);
}
}
static void
@ -988,7 +989,7 @@ test_memcmp (void)
int cnt = 1;
char one[21];
char two[21];
it = "memcmp";
check(memcmp("a", "a", 1) == 0, cnt++); /* Identity. */
check(memcmp("abc", "abc", 3) == 0, cnt++); /* Multicharacter. */