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
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;