[FFmpeg-devel] [PATCH] Altivec split-radix FFT

Måns Rullgård mans
Mon Aug 24 12:33:00 CEST 2009

Guillaume POIRIER <poirierg at gmail.com> writes:

> Hello,
> On Mon, Aug 24, 2009 at 6:09 AM, Loren Merritt<lorenm at u.washington.edu> wrote:
>> 1.6x faster than altivec radix-2 as measured by fft-test on a G4.
>> 2.0x as measured by gprof.

Don't use gprof.  It adds huge overhead making it unreliable.

> Outstanding!
>> I failed to get oprofile

What did you try?  You should be able to use "sudo opcontrol" on my
PPC machine.

> or POWERPC_PERF to measure anything.
> Don't use that, it doesn't work.

Then we should either fix it or remove it.  Keeping it broken serves

M?ns Rullg?rd
mans at mansr.com

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