Nesting management mechanism for use in loop control system

Details Nesting management mechanism for use in loop control system Nesting management mechanism for use in loop control system

1991-11-20

1994-12-20

Shaw, Gareth D.

Boots, shoes, and leggings

364DIG1, 3642431, G06F 940, G06F 930

Patent

active

053752384

ABSTRACT:
A nesting management mechanism for use in a loop controlling system, comprises a program counter coupled to a program counter bus and incremented each time one instruction is executed, and a loop counter coupled with the program counter bus and set with the number of loops to be executed when a loop execution is executed. The loop counter is decremented each time one loop is completed. A loop start address register is coupled to the program counter bus and set with a loop start address when the loop execution is executed, and a loop end address register is coupled to the program counter bus and set with a loop end address when the loop execution is executed. First, second and third independent hardware stacks of a first-in last-out type are provided for the loop counter, the loop start address register, and the loop end address register, respectively, so as to save respective contents of the loop counter, the loop start address register, and the loop end address register at the time of a loop nesting.

REFERENCES:
patent: 4652997 (1987-03-01), Kloker
patent: 4876642 (1989-10-01), Gibson

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