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Re: 252.EON dropped 25% on between 8-31 and 9-02


Daniel Berlin wrote:
> Our SPEC2000 performance on 252.eon dropped by a pretty large amount
> between those days.
> 
> The only patch I see that could have affected this was:
> 
> +2006-09-01  Josh Conner  <jconner@apple.com>
> +
> +       PR c++/25505
> +       * tree-nrv.c (dest_safe_for_nrv_p): New function.
> +       (execute_return_slot_opt): Use it.
> 
> 
> 
> Josh, I assume you access to SPEC, so could you take a look at this?
> 
> (Sorry if i have pegged the wrong patch, i'm just going by the spec
> tester diffs).

Well, I don't see any difference on my i686-pc-linux-gnu box (actually,
I see a 1.5% speedup).  I guess it's still possible my patch does
something horrific on the automated-test machine, but I'm thinking I
might not be the culprit.  I'll try to find some cycles tomorrow to help
narrow this down further, since it is such a serious regression.

- Josh


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