Single instruction updating of processing time field using softw

Details Single instruction updating of processing time field using softw Single instruction updating of processing time field using softw

1988-10-12

1990-06-26

Williams, Jr., Archie E.

Boots, shoes, and leggings

3649371, 3649372, 3649337, 364934, 3649344, G06F 314, G06F 1516, G06F 921, G06F 1536

Patent

active

049377809

ABSTRACT:
In a data processing system, a measurement of the cumulative time used in the performance of an intermittent activity can be required. To determine this cumulative time, a memory location is designated during initialization that is to contain the value of the system clock determined at each initiation of the intermittent activity. A second memory location is provided during initialization that is to contain the accumulated total of the measurements taken to perform the intermittent activity. At each termination of the intermittent activity, the contents of the first and second locations are retrieved from the main memory. The value stored in the first main memory location is then subtracted from the system clock value at the termination of the current intermittent activity and the resulting value is added to the contents of the second location. The resulting value of the addition operation is then stored in the second main memory location. This procedure is implemented with a single instruction and the instruction uses processor working registers for intermediate storage to expedite execution of the instruction.

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