[FFmpeg-devel] [PATCH] avfilter, swresample, swscale: use fabs, fabsf instead of FFABS

Carl Eugen Hoyos cehoyos at ag.or.at
Wed Oct 14 08:40:24 CEST 2015

Ganesh Ajjanagadde <gajjanag <at> mit.edu> writes:

> >> I think the general case, it'd be nice to figure out
> >> why Carl's results are slightly different from yours
> >
> > Why do you think they are different at all?
> > Did you look at the tables?
> They are different, and our conclusions are different 
> (in a slight way). Carl claims that the old code and 
> new code are mostly the same in speed, but in the 
> cases where they differ, the old code is faster.


I wrote that both the numbers you posted and the numbers 
I posted show no proof that the new code is faster.
(Contrary to my numbers, your numbers show that the old 
code may be faster but that is irrelevant.)

The more important question is if you can see the same 
changes in the disassembly of af_astats.o as what 
ubitux posted here for a short test function?

Carl Eugen

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