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Re: [Scheme-reports] Bitwise operations on bytes

I can report at least one system (not Scheme) that I know promotes
bitvectors to bytevectors for speed purposes precisely because masking
out the bits is too expensive.  In my own tests this has been born out
as well.

Do you know what makes masking the bits on that system so expensive?  Is there considerable overhead beyond the low-level bit-manipulation instructions?
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