Re: [Iverilog-devel] vec4-stack branch, and the vvp rework

[Cary R. <cy...@ya...>]

For the short tests I'm guessing the initial setup and parsing is a significant part of the total run time and that the longer tests are a more accurate measure of the change in simulation speed caused by the vec4-stack changes. Given that Icarus is already slow I would hope that this rework does not get merged into master until it is at least on par with the current implementation. Ideally this rework would give us a significant speedup, but that may be optimistic without a more expansive rework.
I may have some time to test this branch later, but work and my personal life are swamping me right now.
Cary
 

     On Friday, November 14, 2014 4:38 PM, Martin Whitaker <mai...@ma...> wrote:
   

 I've run all my regressions tests that Icarus can handle without exposing any 
bugs. Run time for a large group of relatively short tests increased by 25%. 
Run time for a small group of moderately long tests increased by 50%.

Stephen Williams wrote:
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> A little while ago I took on a redesign of the handling of vectors
> in the vvp run-time. For those of you in the know, the idea is to
> replace the flat thread vector space with a vector stack. The intent
> is to remove some vector length constraints and to allow for some
> theoretical performance improvements.
>
> That work is in the vec4-stack branch. Almost all of the regression
> test now works with the new branch and I want to start building up
> confidence in it by putting it out there for the more daring of you
> to try out.
>
> The intent is that version perform better then the existing style,
> but those performance benefits are almost surely not realized yet.
> I will be doing some profiling soon and really tackling execution
> times, but if you have any feedback there, that would be good, too.
>
> Right now, however, I'm mostly interested in quality of the results.
> Did I introduce any new bugs? There are a very few that I see in
> the ivtest results, but I would like to hear about any new bugs.
>
> Thanks,
> - --
> Steve Williams                "The woods are lovely, dark and deep.
> steve at icarus.com          But I have promises to keep,
> http://www.icarus.com         and lines to code before I sleep,
> http://www.picturel.com       And lines to code before I sleep."
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