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Showing content from http://www.lispworks.com/documentation/lw71/CLHS/Body/f_ldb_te.htm below:

CLHS: Function LDB-TEST

Syntax:

ldb-test bytespec integer => generalized-boolean

Arguments and Values:

bytespec---a byte specifier.

integer---an integer.

generalized-boolean---a generalized boolean.

Description:

Returns true if any of the bits of the byte in integer specified by bytespec is non-zero; otherwise returns false.

Examples:

 (ldb-test (byte 4 1) 16) =>  true
 (ldb-test (byte 3 1) 16) =>  false
 (ldb-test (byte 3 2) 16) =>  true

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also:

byte, ldb, zerop

Notes:

 (ldb-test bytespec n) == 
 (not (zerop (ldb bytespec n))) == 
 (logtest (ldb bytespec -1) n)

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