Blog Control to Major Tom.

Blog Control to Major Tom.
"there's still lofty dreams, meager desires, still silliness."

13 Dec 2004

Another Java Options Submission

I recently got a message from Oliver F. regarding an option he found in a bug, Bug 5108893 which has to do with some performance problems with Math.abs() on various x86 platforms. Within the bug report, he found the option -XX:UseSSE=i which apparently forces the Hotspot compiler to use different SSE instructions for various mathematical operations.

Oliver didn't explain why he was looking into the bug, but at any rate, I have added it to the Options List.

(2004-12-13 17:41:32.0) Comments [1] // Permalink

Comments:

I fixed that for Java6, Math.abs() should be fast again :) As for what -XX:UseSSE does, basically it works like this: -XX:UseSSE=0 // FPU only, don't use SSE -XX:UseSSE=1 // FPU + SSE -XX:UseSSE=2 // SSE + SSE2 Anyway I've also improved various other trig and transcendentals. Have Oliver check out one of the Java6 weekly builds!

Posted by Azeem Jiva on December 14, 2004 at 02:45 PM PST #