[opus] [RFC PATCH v1 0/8] Ne10 fft fixed and previous

Jean-Marc Valin jmvalin at jmvalin.ca
Fri May 8 10:06:39 PDT 2015

Is the actual output of the test posted somewhere? One thing I would
suspect is that the test might use values that trigger overflows not
generally triggered with audio.


On 08/05/15 11:08 AM, Viswanath Puttagunta wrote:
> Hello Timothy,
> Just FYI, Phil at ARM is still looking into why mdct is failing.. will
> keep you posted. In the mean time, do you want me to disable NE10 for
> mdct_forward and re-submit the patchset so we may make progress?
> Regards,
> Vish
> On 30 April 2015 at 09:33, Viswanath Puttagunta
> <viswanath.puttagunta at linaro.org> wrote:
>> On 29 April 2015 at 17:22, Timothy B. Terriberry <tterribe at xiph.org> wrote:
>>> Viswanath Puttagunta wrote:
>>>> This patch series is follow up on work I posted on [1].
>>>> In addition to what was posted on [1], this patch series mainly
>>>> integrates Fixed point FFT implementations in NE10 library into opus.
>>>> You can view my opus wip code at [2].
>>> Thanks, and I apologize for being slow here.
>>>>     - This was surprising to me because test_unit_dft passes for all
>>>>       nfft including 60, 120, 240, 480. May be there are some data
>>>>       corner cases that need further investigation.
>>> Yes, that seems concerning. I'd like to at least understand the cause of the failures. "Audio is clearly audible" is not a very strong test for encoder quality regressions, but in the worst case we could just disable NE10 for mdct_forward.
>> Yes, agree we need to root cause this.. I only mentioned audio is
>> audible clearly to point out that NE10 fft is not completely messed
>> up, but does have some corner cases where it is failing. ARM folks are
>> actively looking into this issue, and expecting some resolution next
>> week.
>> Also, this NE10 fixed fft issue only impacts patches
>> armv7,armv8: Optimize fixed point fft using NE10 library
>> armv7,armv8: Extend fixed fft NE10 optimizations to mdct
>> In the mean time, do you want me (as you suggested) disable NE10 fixed
>> fft for mdct_forward? That way when it gets fixed in NE10, it will
>> just be a one line change patch that will follow.
>> Either way, request that we make progress on review/merge rest of the patches.
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