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| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | string/memmem.c | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 00e666b02d..d4bd101fb4 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2019-09-13 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> + + * string/memmem.c: Use memcmp for first match. + 2019-09-13 Wilco Dijkstra <wdijkstr@arm.com> * string/strcasestr.c (STRCASESTR): Simplify and speedup first match. diff --git a/string/memmem.c b/string/memmem.c index 43efaa3fb7..d72b8249e6 100644 --- a/string/memmem.c +++ b/string/memmem.c @@ -70,6 +70,10 @@ __memmem (const void *haystack_start, size_t haystack_len, haystack_len -= haystack - (const unsigned char *) haystack_start; if (haystack_len < needle_len) return NULL; + /* Check whether we have a match. This improves performance since we + avoid the initialization overhead of the two-way algorithm. */ + if (memcmp (haystack, needle, needle_len) == 0) + return (void *) haystack; return two_way_short_needle (haystack, haystack_len, needle, needle_len); } else |