[4.4] Strange performance regression?

[Joern Rennecke]

Quoting Mark Tall <mtall.qld@gmail.com>:

> Joern Rennecke wrote:
>> But at any rate, the subject does not agree with
>> the content of the original post.  When we talk
>> about a 'regression' in a particular gcc version,
>> we generally mean that this version is in some
>> way worse than a previous version of gcc.
>
> Didn't the original poster indicate that gcc 4.3 was faster than 4.4 ?
>  In my book that is a regression.

He also said that it was a different machine, Core 2 Q6600 vs
some kind of Xeon Core 2 system with a total of eight cores.
As different memory subsystems are likely to affect the code, it
is not an established regression till he can reproduce a performance
drop going from an older to a current compiler on the same or
sufficiently similar machines, under comparable load conditions -
which generally means that the machine must be idle apart from the
benchmark.