jpountz commented on code in PR #13381:
URL: https://github.com/apache/lucene/pull/13381#discussion_r1606102693
##########
lucene/core/src/java/org/apache/lucene/util/BitUtil.java:
##########
@@ -303,4 +303,12 @@ public static int zigZagDecode(int i) {
public static long zigZagDecode(long l) {
return ((l >>> 1) ^ -(l & 1));
}
+
+ /**
+ * Return true if, and only if, the provided integer - treated as an
unsigned integer - is either
+ * 0 or a power of two.
+ */
+ public static boolean isZeroOrPowerOfTwo(int x) {
+ return (x & (x - 1)) == 0;
+ }
Review Comment:
Indeed, the slow start is a feature: I want to gather evidence that
`prefetch` is always called on memory regions that are loaded in the page cache
before skipping calls to madvise. I don't think that a masked counter would do
what we want.
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