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Re: 40% performance regression SPEC2006/leslie3d on gcc-4_2-branch
Grigory Zagorodnev wrote:
> Mark Mitchell wrote:
>> Excellent question; I should have asked for that as well. If 4.2 has
>> gained on 4.1 in other respects, the 4.7% drop might represent a smaller
>> regression relative to 4.1.
>>
> There is the 4.2 (r120817) vs. 4.1.2 release FP performance comparison
> numbers. SPECfp_base2006 of gcc 4.2 has 19% performance gain over 4.1.2.
Thank you for the measurements.
In that case, I think we have absolutely nothing to worry about for
4.2.0. Whether we deliver 19% SPECfp, 23% SPECfp, or 15% SPECfp
improvements isn't so important; all of those numbers are a vast
improvement over 4.1.x. Given that, I think we should just leave
Danny's conservative changes in, and not worry.
Thanks,
--
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713