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*To*: Common-Lisp at sail*Subject*: Bit vectors*From*: MOON at SCRC-TENEX*Date*: Tue, 21 Sep 1982 00:10:00 -0000

I only just noticed that the Boolean operations on bit-vectors (BIT-AND and so forth) are non-destructive operations; they return a new bit-vector containing the result. This makes bit-vectors completely redundant with integers, which also have non-destructive mapped Boolean operations (LOGAND and so forth), except for the way they print and possibly some benefit to be derived from using generic sequence operations on them. I had always assumed that the big feature of bit vectors was the efficiency to be gained by using destructive operations, in applications such as parallel intersection and union of sets, e.g. in compiler flow analysis. I would like to propose that Common Lisp either provide destructive bit-vector operations, which store into their first argument (possibly in addition to the non-destructive ones), or else that bit vectors be removed from the language as an unuseful redundancy.

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