Review request for JDK-8037534

[Attila Szegedi]

Repeated request to please review this. Since I got no reviews first time around, I updated it in-place with further development -- see the JIRA issue. box2d is down to 377 recompilations by having the compiler do safe evaluation of certain expressions.

http://cr.openjdk.java.net/~attila/8037534/webrev.01/index.html

On Mar 19, 2014, at 5:34 PM, Attila Szegedi <attila.szegedi at oracle.com> wrote:

> Actually, the link is http://cr.openjdk.java.net/~attila/8037534/webrev.01/index.html
> 
> On Mar 19, 2014, at 5:33 PM, Attila Szegedi <attila.szegedi at oracle.com> wrote:
> 
>> Please review JDK-8037534 at http://cr.openjdk.java.net/~attila/8037534/webrev.00
>> 
>> From the JIRA issue: 
>> 
>> "When doing on-demand compilation, we can use the current runtime scope to look up types of variables in scope; if they're already wider than the current optimistic assumption, we can use that type and cut down on number of recompilation."
>> 
>> This cuts down warmup time with optimistic compilation. In Octane tests, box2d now does 1300 deoptimizations instead of 1552 while it warms up, and earley-boyer is down to 1577 from whopping 3028.
>> 
>> Thanks,
>> Attila.
>