Hardware control for repeating program loops in electronic compu

Details Hardware control for repeating program loops in electronic compu Hardware control for repeating program loops in electronic compu

1976-12-13

1978-06-27

Thomas, James D.

Boots, shoes, and leggings

G06F 906

Patent

active

040979202

ABSTRACT:
Push-pop stack and counters added to automatic processor's program addressing and execution logic. A certain instruction, typically a load counter instruction, "pushes" the contents of the program counter (instruction address register) onto the stack (that is, loads the stack in the direction from top toward bottom). Other certain instructions, such as decrement and test counter, or special bits in all instructions decrement the last loaded counter's value by one and test for zero counter value. If the test is false, the instruction address register's contents are replaced by the top stack word and the program loop is repeated. The program loop is thus repeated until the test is true. When the test is true, the program counter addresses the next instruction in sequence and the stack is popped (its contents are shifted in the direction from the bottom toward the top of the stack), the top stack word being lost since the program loop will not be repeated. The counter pointer may be controlled by the program or may be automatic, i.e., under hardware control.

REFERENCES:
patent: 3297999 (1967-01-01), Shimabukuro
patent: 3328763 (1967-06-01), Rathbun
patent: 3366929 (1968-01-01), Mullery
patent: 3546677 (1970-12-01), Barton
patent: 3593306 (1971-07-01), Toy
patent: 3593313 (1971-07-01), Tomazewski
patent: 3736567 (1973-05-01), Lotan
patent: 3868644 (1975-02-01), Healey
patent: 3988717 (1976-10-01), Kisylia

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