Boots – shoes – and leggings
Patent
1990-07-31
1994-02-01
Lee, Thomas C.
Boots, shoes, and leggings
364736, 364254, 3642543, 364DIG1, G06F 1206
Patent
active
052838781
ABSTRACT:
Method and apparatus are provided for encoding data types to identify the type of object being operated on during execution of a computer program on a data processing system including byte-addressed memory. The object is represented by at least one machine word having a plurality of bits. The method includes the steps of storing an object in the byte-addressed memory so that the lower three bits of the object are in a zero state and setting one of the lower three bits to a non-zero state to indicate a particular data type. Three different types of data can be verified by checking the state of a single bit. In one embodiment of the invention the method further includes the step of setting a second one of the lower three bits to a non-zero state to indicate that the object, such as NIL, is a member of two data types. In a second embodiment of the invention the method further includes the step of setting a bit immediately adjacent the lower three bits to a non-zero state to indicate whether the object is a short-float object. The invention has particular utility for use with the computer programs written in a LISP-like language.
REFERENCES:
patent: 4644489 (1987-02-01), Curtin et al.
patent: 4922414 (1990-05-01), Holloway et al.
Lee Thomas C.
Lintz Paul R.
Top Level Inc.
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