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305 logeqv
I
sys:%logdpb is good for manipulating flXIlum bit-masks such as are used in
some internal system tables and data structures.
The behavior of sys:%logdpb depends on the size of flXIlums, so functions
using it might not work the same way on future implementations of Symbolics
Common Lisp. Its name starts with "%" because it is more like
machine-level subprimitives than other byte manipulation functions.
For a table of related items: See the section "Machine-dependent Arithmetic
Functions" in Symbolics Common Lisp: Language Concepts.
logeqv &rest integers Function
Returns the bit-wise logical equivalence (also known as exclusive nor) of its
arguments. If no argument is given, the result is -1, which is an identity
for this operation.
Examples:
(logeqv) => -1
(logeqv 5) => 5
(logeqv -3 4) => 6 ;-3 is #b11191 and 4 is #b99199
(logeqv 9 2) => -12
(logeqv -3 4 9 2) => 13 ; (logeqv 6 -12) => 13
See the function boole, page 54.
For a table of related items: See the section "Functions Returning Result
of Bit-wise Logical Operations" in Symbolics Common Lisp: Language Concepts.
logior &rest integers Function
Returns the bit-wise logical inclusive or of its arguments.
If no argument is given, the result is zero. This is an identity for this
operation.
Examples:
(logior) => 9
(logior -5) => -5
(logior 3 19) => 11
(logior 4 8 2) => 14
See the function boole, page 54.
For a table of related items: See the section "Functions Returning Result
of Bit-wise Logical Operations" in Symbolics Common Lisp: Language Concepts.