Re: Bad performance (regression) on oopack's Complex test

[Jan Hubicka <jh at suse dot cz>]

> Falk Hueffner wrote:
> 
> >Have you tried -O3, or generally tuning inlining?
> >
> I have tried both, with no positive results (the inlined operators are 
> very small)
> 
> >BTW, on Alpha, I can see an improvement:
> >
> Nice. In fact on an older PII machine I was seeing Ratios similar to yours.
> I think that there is a general issue and a specific one concerning P4 
> (slowness of memory accesses?)

I will try to look closer into this soon, as -march=pentium4 is my
work after all.  It needs a lot more effort than I was able to put into
it - for instance scheduling is entirely missing.
What effect does have -mfpmath=sse switch?

Honza
> 
> >Just for fun, here's the result of cxx -O5 -fast:
> >
> I know :-( ... this is the final goal which icc already achieves on any 
> x86 cpu.
> 
> Paolo.