Hi Josef,
Thanks very much for the reply. Comments below...
> > I am running valgrind 3.4.1 on a ppc32 system, using uClibc. I am
using
> > 3.4.1 because 3.5.0 won't compile for ppc32.
>
> Oh, what is the reason?
http://osdir.com/ml/kde-bugs-dist/2009-08/msg13796.html
I have since tried using 3.6 from the TRUNK however, and I got the same
problem.
> Yes, it is known that Callgrind sometimes is completely wrong regarding
calls
> and returns on PPC{32/64}, as well as on the newly introduced ARM
support in
> the upcoming 3.6.0 (see bug 252091 for the ARM bug report,
> https://bugs.kde.org/show_bug.cgi?id=252091).
>
> The reason are some hardcoded assumptions which only are true on
x86/amd64.
>
> Can you open a similar bug report for PPC32 for this, describing the
problems
> you see?
I will get a small sample program to behave badly, and then post it in a
bug report.
This sucks quite a bit, since callgrind is the only profiling solution
available on my platform (gprof and orprofile won't work for various
reasons).
As I said however, the output from callgrind looks relatively sane. Am I
a fool to rely on it as some sort of guide for optimisation work?
In the meantime, I will work with the developers to get this fixed. Am
happy to do dev work. It's very important to me that this be resolved.
Thanks again,
Stuart
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