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From Egor Pasko <egor.pa...@gmail.com>
Subject Re: [testing] optimization regressions (was: Re: [result] Re: [vote] HARMONY-1363 - DRLVM fixes and additions)
Date Fri, 15 Sep 2006 10:53:00 GMT
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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