Method and apparatus for performing range checks

Details Method and apparatus for performing range checks Method and apparatus for performing range checks

1982-04-28

1985-09-17

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 702

Patent

active

045424560

ABSTRACT:
Disclosed is a method and an apparatus for range checking a value in a programmable system. An instruction prefix LDRNG enables the checking of a value against one or both limits of a range of values. The value is calculated as part of the execution of a primary instruction which is any suitable instruction, such as ADD, MOVE, STORE, etc., that directly follows the prefix. During the execution of the primary instruction the range check is performed, and an exception is taken without completing execution of the primary instruction if the value does not lie within the range.

REFERENCES:
patent: 4169290 (1979-09-01), Reed et al.
patent: 4215400 (1980-09-01), Denko
patent: 4338660 (1982-07-01), Kelley et al.
patent: 4356546 (1982-10-01), Whiteside et al.
Dwight D. Hill, "A Hardware Mechanism for Supporting Range Checks", Computer Architecture News, pp. 15-20, Jun. 15, 1981.
"Instruction Set Architecture for the Military Computer Family," p. 89, MIL-STD-1862, May 28, 1980.
C. Mead and L. Conway, Introduction to VLSI Systems, pp. 145-217, (1980).
"A Proposed Standard for Binary Floating-Point Arithmetic," Computer, pp. 51-62, Mar. 1981.

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