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

[Carl Eugen Hoyos]

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 
afaict.

Carl Eugen