[Bug 773073] audioconvert: endian conversion optimization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773073

--- Comment #34 from Petr Kulhavy <brain at jikos.cz> ---
(In reply to Tim-Philipp Müller from comment #31)
> Cool! Out of curiosity, did you benchmark the ORC variants? Are they faster
> than what the compiler does by default with the C functions? (I guess the
> compiler won't do anything fancy here if it's not told to do so for a
> specific extension?)

Not yet, but on the CPU % the difference is not visible.
In fact the convert loop brings just a marginal gain. 
The main optimization potential/gain in my test environment is data cache
usage, allocating and copying buffers. The endian fast-path brought 4-5% CPU
gain because of that.

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