As of previous post, we still had a number of problems with optimised builds. Specifically, Java "long" type variables have been handled wrongly with optimisation beyond "-O." We now have identified and fixed all currently known problems, ranging from missing assembly code clobber flags to unsafe 64-bit variable manipulation. While working on this we have written a couple of Java "long" type tests, which, after adding all missing long bytecode trap handlers, now all work. Jamvm can now be successfully built and used with "-O," "-O2," "-O3," and "-Os" optimisation flags. Interestingly, we have not been able to detect any performance improvements when switching from "-O" to any deeper optimisation. All relevant changes committed upstream.