[FFmpeg-devel] [PATCH] PPC64: Add versions of functions in libswscale/input.c optimized for POWER8 VSX SIMD.

Carl Eugen Hoyos cehoyos at ag.or.at
Tue Jul 5 18:57:02 EEST 2016

Ronald S. Bultje <rsbultje <at> gmail.com> writes:

> What kind of speedup are you seeing

His patch provides a 10% - 30% speedup for most libswscale 
input functions, but not for rgb24->yuv with gcc 5.

> and how did you measure that,

He measured it with some performance tool and with 
-benchmark and with START/STOP_TIMER().

> and why doesn't START/STOP_TIMER show these speedups?

It does show the same results as the performance tool 

Carl Eugen

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