Request for reviews (XS): 6829127: Deoptimization Failure on Specjvm98 _227_mtrt with -XX:+DeoptimizeALot since Hs11 b01

[Tom Rodriguez]

Looks good.  Thanks for tracking this down.

tom

On Aug 11, 2009, at 10:51 AM, changpeng fang - Sun Microsystems -  
Santa Clara United States wrote:

> http://cr.openjdk.java.net/~cfang/6829127/webrev.00/
>
> Fixed 6829127: Deoptimization Failure on Specjvm98 _227_mtrt with - 
> XX:+DeoptimizeALot since Hs11 b01
>
> Problem:
> The safepoint blob  can be used in methods which are using the non  
> standard control word for optimized
> float math. However, the non standard control word may leak out to  
> other codes which will cause assertion
> failure in RegisterSaver::save_live_registers.
>
> Solution:
> We can deopt at a poll point with the non standard control word, so  
> we make the deopt blob to not complain about
> the non standard word and set the standard control word after  
> restore_result_registers in the deopt blob.
>
> Tests: specjvm98, specjvm2008 with -XX:+DeoptimizeALot
>
>
> Thanks,
>
> Changpeng