Hello!
In a few places we have code that rounds an integer up to the nearest
power of two.
It is done with a series of RSHOTFs and ORs, but it can possibly be done
faster with the use of Integer.numberOfLeadingZeros (assuming it is
intrinsified).
Would you please help review this trivial optimization:
BUGURL: https://bugs.openjdk.java.net/browse/JDK-8203279
WEBREV: http://cr.openjdk.java.net/~igerasim/8203279/00/webrev/
For HashMap.tableSizeFor() I created a simple test with a loop from
Integer.MIN_VALUE to Integer.MAX_VALUE (including), to make sure the
result is the same.
For TimSort.ensureCapacity() I checked all positive values of minCapacity.
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With kind regards,
Ivan Gerasimov
