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strcmp: Add a testcase for page boundary

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Add a strcmp testcase to cover cases where both strings end on the page
boundary.
This commit is contained in:
H.J. Lu 2020-06-11 09:03:56 -07:00
parent f7e3f92b7c
commit 659c041188
1 changed files with 33 additions and 0 deletions
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33
string/test-strcmp.c
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@ -359,6 +359,38 @@ check (void)
}
}
static void
check2 (void)
{
/* To trigger bug 25933, we need a size that is equal to the vector
length times 4. In the case of AVX2 for Intel, we need 32 * 4. We
make this test generic and run it for all architectures as additional
boundary testing for such related algorithms. */
size_t size = 32 * 4;
CHAR *s1 = (CHAR *) (buf1 + (BUF1PAGES - 1) * page_size);
CHAR *s2 = (CHAR *) (buf2 + (BUF1PAGES - 1) * page_size);
int exp_result;
memset (s1, 'a', page_size);
memset (s2, 'a', page_size);
s1[(page_size / CHARBYTES) - 1] = (CHAR) 0;
s2[(page_size / CHARBYTES) - 1] = (CHAR) 0;
/* Iterate over a size that is just below where we expect the bug to
trigger up to the size we expect will trigger the bug e.g. [99-128].
Likewise iterate the start of two strings between 30 and 31 bytes
away from the boundary to simulate alignment changes. */
for (size_t s = 99; s <= size; s++)
for (size_t s1a = 30; s1a < 32; s1a++)
for (size_t s2a = 30; s2a < 32; s2a++)
{
CHAR *s1p = s1 + (page_size / CHARBYTES - s) - s1a;
CHAR *s2p = s2 + (page_size / CHARBYTES - s) - s2a;
exp_result = SIMPLE_STRCMP (s1p, s2p);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1p, s2p, exp_result);
}
}
int
test_main (void)
@ -367,6 +399,7 @@ test_main (void)
test_init ();
check();
check2 ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)