Commit b4e5061f authored Sep 10, 2014 by Mathieu Chartier

Change EmptyArray System.identityHashCode to Object.hashCode.

Equivalent behavior, improves performance since
Object.hashCode has a fast path in the java side that does not
require JNI.

According to traceview sampling profiler:
Calendar had 6.8% time in System.identityHashCode during launch.
0.4% time in System.identityHashCode after the change.

Bug: 16828525

Change-Id: I1ed1d1283a990f990b0d4352cc1f4822b1dadf7b

parent 6cb95276

core/java/com/android/internal/util/ArrayUtils.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -107,7 +107,7 @@ public class ArrayUtils
		return (T[]) EmptyArray.OBJECT;
		}

		int bucket = ((System.identityHashCode(kind) / 8) & 0x7FFFFFFF) % CACHE_SIZE;
		int bucket = (kind.hashCode() & 0x7FFFFFFF) % CACHE_SIZE;
		Object cache = sCache[bucket];

		if (cache == null \|\| cache.getClass().getComponentType() != kind) {