[opus] opus Digest, Vol 76, Issue 11

[Phil Wang]

Hi Jean-Marc,

Thanks for pointing us the way.
Yes it is a overflowing problem. I moved all scaling code in the front of any other operations, and test_unit_mdct passes for all sizes.
I will update Ne10 right after Vish double checks it on hardware. He will repost patches with more verification later this week.

Regards,
Phil Wang

Well, I see three questions that need to be answered at this point
1) At what value the overflow starts happening
2) What's the minimum requirement to avoid overflows in the encoder
3) What is causing the overflow to happen much earlier with Neon than
the C code

Once these three are answered, the solution should be clear.

        Jean-Marc



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