Hi, RegMask are allocated double-aligned, which doesn't seem to have any real effect on any of our supported platforms. Simplify. Bug: https://bugs.openjdk.java.net/browse/JDK-8221404 Webrev: http://cr.openjdk.java.net/~redestad/8221404/open.00 Testing: tier1-3 (together with JDK-8221343) Thanks! /Claes