6559156: My favorite defect

Tom Rodriguez Thomas.Rodriguez at Sun.COM
Mon Nov 26 15:52:22 PST 2007

I would agree.  That bug is not for beginners since it's really a loop 
optimization bug.


steve goldman wrote:
> rgougol at email.sjsu.edu wrote:
>> Hello everybody,
>> I am trying and hoping to remove the defect 6559156,
>> http://bugs.sun.com/view_bug.do?bug_id=6559156. In fact, I am supposed 
>> to have a
>> contribution by the next two weeks as a requirement of my course 
>> CS286: Open
>> Source Development, http://www.horstmann.com/sjsu/cs286/gs.html. Will 
>> I have the
>> chance? If not, would you provide me an alternative defect removal or 
>> RFE as
>> soon as possible. 
> You should try an pick another defect.
>> My assumption is that the defect exists in file 
>> /src/share/vm/opto/subnode.cpp
>> within optimizations of integer cmp. I wish I could trace the server 
>> compiler at
>> this file using GDB. 
> My understanding is that is an incorrect assumption and that the problem 
> is related to the guard expressions created in order to create pre/post 
> loops and unrolling and that the fix is rather complicated.

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