AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Code Transformations that JVM applies          AppletTalk.com Forum Index -> JVM, native methods and hardware View previous topic :: View next topic   Author Message Ripunjay Tripathi Guest Posted: Wed Feb 09, 2011 3:14 am    Post subject: Code Transformations that JVM applies Friends, I was reading a paper "The Java Memory Model" by Pugh and Manson, where I saw a statement which suggests that JVM can apply certain optimizations/transformations while producing native code. I am new to java and need help in understanding what kind of transformation can they be ? Any pointers to resources are welcome. Ripunjay Tripathi Back to top Roedy Green Guest Posted: Fri Feb 11, 2011 5:30 am    Post subject: Re: Code Transformations that JVM applies On Tue, 8 Feb 2011 19:14:43 -0800 (PST), Ripunjay Tripathi <ripunjay.tripathi (AT) gmail (DOT) com> wrote, quoted or indirectly quoted someone who said : Quote: I am new to java and need help in understanding what kind of transformation can they be ? Java was designed to give the JVM considerable freedom, so long as the net effect is the same. Java avoids constructs like struct overlays that inhibit optimisation. Examples of things it can do: 1. store strings in 8, 16 or compressed format or a mixture 2. use 32 or 64 bit addresses. 3. store bits packed in various ways 4. numbers can be stored big or little ended. 5. inline methods 6. standard optimisations you would do in a C compiler. 7. optimise the true size of StringBuilders, ArrayLists etc. 8. monitor interpreted code running to gather stats to optimise the machine code generated. -- Roedy Green Canadian Mind Products http://mindprod.com Your top priority should be fixing bugs. If you carry on development, you are just creating more places you will have to search for them. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> JVM, native methods and hardware All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.