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From "Pavel Ozhdikhin" <pavel.ozhdik...@gmail.com>
Subject Re: [testing] optimization regressions (was: Re: [result] Re: [vote] HARMONY-1363 - DRLVM fixes and additions)
Date Fri, 15 Sep 2006 15:26:11 GMT
Thanks for explaining. This is another variant of the bytecode-based
regression tests.

-Pavel


On 15 Sep 2006 17:53:00 +0700, Egor Pasko <egor.pasko@gmail.com> wrote:
>
> On the 0x1E5 day of Apache Harmony Pavel Ozhdikhin wrote:
> >  Egor,
> >
> > How Nullstone tests differ from what Rana proposed and Mikhail L.
> prototyped
> > - could you please elaborate?
>
> the idea is simple. You have two versions of a test. First --
> unoptimized, second -- same algorithm, but optimized by hand with a
> specific optimization. If the times of execution differ much, then,
> the optimization is not done properly in the checked compiler.
>
> It works best with optimizations that are easy to represent in a
> high-level language (i.e. Java), such as "load hoisting", "loop
> unrolling", etc.
>
> see http://www.nullstone.com for more info
>
> --
> Egor Pasko, Intel Managed Runtime Division
>
>
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