On 1/2/06, Stefan Teleman <[EMAIL PROTECTED]> wrote: > > Things have probably changed since then as there were major compiler > > releases since then. Maybe it would be a good time to rerun it with > > Sun Studio 11 (-fast) and equivalent on gcc 4.0 (-O3 -ffast-math > > -funroll-loops -mcpu=ultrasparc3 -m64 -mvis -ftree-vectorize). > > And after all, they are still just benchmarks. Results could be the > > other way around with different benchmarks as seen in your case. > > -fast is not the fastest option on either SPARC or X86. he who uses > -fast shall be disappointed. :-) it actually generates significantly > _slower_ code than other options (which require more work because they > need to be written out). I would be very careful using any optimization that sets the -fns on Sun Studio, as I've seen significant differences in results when enabling this. For that matter, -ffast-math has a similar effect with gcc. I question how much any of this would affect KDE though, since enhancements to both Sun Studio and GCC optimization have had to do additions for the new incarnations of simd instructions and should really only affect floating point performance, so far as I am aware. For something like KDE I would imagine that the memory footprint would be more important than anything else when it comes to performance. Am I missing something?
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