Bug: https://bugs.openjdk.java.net/browse/JDK-8225104 The new UseCompressedOops block has to be protected with _LP64, like all other blocks are. I think it is a trivial change, please review. Fix: http://cr.openjdk.java.net/~shade/8225104/webrev.01/ Testing: {x86_32, x86_64} builds -- Thanks, -Aleksey