Is it a bug? That last subtraction is a s_subb with the double 'b'. That subtracts not only 1, but also the SCC=1 which was used to exit out of the inner loop.
Actually a bug in my eyesight
Didn't notice that extra 'b' in s_subb_u32. (Code completion can be dangerous lol)
Thank you all!
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I have asked some knowledgeable people. Hopefully they will reply soon.