[FFmpeg-devel] [RFC] an aes "optimization"
Fri Jul 2 21:21:10 CEST 2010
On Fri, Jul 2, 2010 at 4:15 PM, Guillaume POIRIER <poirierg at gmail.com> wrote:
> On Fri, Jul 2, 2010 at 9:10 PM, Reimar D?ffinger
> <Reimar.Doeffinger at gmx.de> wrote:
>> On PPC64 (using gcc 4.3.5) the timer seems seems to be broken, because
>> it claims a ridiculously low 213 vs. 216 decicycles (the difference
>> is below the precision of measurement)...
> The problem is that on PPC, the only CPU-model independent timer
> that's available is the "The Time Base Registers", which is increment
> by one every four *bus* cycles.
> CF: ffmpeg-svn/doc/ffmpeg_powerpc_performance_evaluation_howto.txt
That .txt was removed in r23808 along with --powerpc-perf-enable
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