Review Request: Zero speedup

[Vladimir Kozlov]

Gary,

I created bug 6926048: Improve Zero performance

Changes are good so I will push them.

Thanks,
Vladimir

Gary Benson wrote:
> Hi all,
> 
> Zero's normal and native method entries both call
> methodOopDesc::result_type when a method returns without an exception.
> I didn't realise, but this parses the method's signature, so is pretty
> slow.  This webrev makes Zero figure out result types in a similar way
> to the x86 and sparc C++ interpreter implementations.
> 
>   http://cr.openjdk.java.net/~gbenson/zero-speedup-01/
> 
> Some quick and dirty SPECjvm98 numbers (not produced in compliance
> with the SPECjvm98 run rules and therefore not comparable with
> SPECjvm98 metrics):
> 
>                    Old       New  Speedup
>   compress      151.38    136.34     9.9%
>   jess           38.81     28.64    26.2%
>   db             73.22     59.11    19.3%
>   javac          43.10     34.84    19.2%
>   mpegaudio     108.47    100.61     7.2%
>   mtrt           38.66     29.30    24.2%
>   jack           27.68     22.40    19.1%
> 
> I don't have a bug id for this.
> 
> Cheers,
> Gary
>