diff options
Diffstat (limited to 'string/test-strncmp.c')
| -rw-r--r-- | string/test-strncmp.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/string/test-strncmp.c b/string/test-strncmp.c index d961ac4493..962679b384 100644 --- a/string/test-strncmp.c +++ b/string/test-strncmp.c @@ -403,6 +403,38 @@ check2 (void) free (s2); } +static void +check3 (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; + + /* 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_STRNCMP (s1p, s2p, s); + FOR_EACH_IMPL (impl, 0) + check_result (impl, s1p, s2p, s, exp_result); + } +} + int test_main (void) { @@ -412,6 +444,7 @@ test_main (void) check1 (); check2 (); + check3 (); printf ("%23s", ""); FOR_EACH_IMPL (impl, 0) |