[RC5] Why is CSC bitslice MMX only?

Thu Dec 16 01:51:57 EST 1999

I haven't seen this question asked yet, so I'll be the one.  Why is the CSC
bitslicing core limited to x86 MMX processors?  If I remember correctly from
the DES days, the concept of bitslicing doesn't use any types of operations
that are unique to the MMX instruction set, so that can't be why.  Does it
have something to do with register size?  I remember someone saying that we
can't bitslice RC5 because it would require significantly wider registers
than current processors have.  Inquiring minds want to know...

Greg Orman
A man's best friends:  a Harley, a Beretta and a Gund.

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