crc32() optimization

[Joakim Tjernlund]

Hi Wolfgang 

What's "Duff's Device"?

        Jocke
> 
> Seems broken to me, since you "len >>= 3" twice.
> 
> Also, Duff's Device comes to mind.
> 
> Best regards,
> 
> Wolfgang Denk
> 
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> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
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