commit 16e1c9dfdc2a7d1303b8e519deede3eda36a41ae
author Mark Salyzyn <salyzyn@google.com> Fri Oct 02 10:00:38 2015 -0700
committer Mark Salyzyn <salyzyn@google.com> Fri Oct 02 13:55:44 2015 -0700
tree dcc197a8760734ece778d6cbdaa9800710c1e897
parent b955f476d3b11da9378d5eedfc569711f625e1ba

liblog: optimize code hotspot

strcmp was 1/10 #2 behind find_property in __android_log_level(),
now virtually eliminated from performance profile.

Bug: 23685592
Change-Id: I3978886193af77e489c6d1728d6a26b7f53f8f2f

liblog/log_is_loggable.c

diff --git a/liblog/log_is_loggable.c b/liblog/log_is_loggable.c
index 7a8e33f..cd85ff6 100644
--- a/liblog/log_is_loggable.c
+++ b/liblog/log_is_loggable.c
@@ -93,7 +93,7 @@
     if (taglen) {
         uint32_t current_local_serial = current_global_serial;
 
-        if (!last_tag || strcmp(last_tag, tag)) {
+        if (!last_tag || (last_tag[0] != tag[0]) || strcmp(last_tag + 1, tag + 1)) {
             /* invalidate log.tag.<tag> cache */
             for(i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
                 tag_cache[i].pinfo = NULL;