Computer rotate function
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United States of America Patent
Stats
-
Jan 22, 1985
Grant Date -
N/A
app pub date -
Sep 29, 1982
filing date -
Sep 29, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The rotate function of this invention involves cyclic shifts of 1 to 4 byte data by an amount of 0, 1, 2, or 3 bytes either to the left or to the right. Only one CPU firmware clock cycle is required regardless of the shift amount. This shifting is done either on data which is transferred from computer memory or on data prior to its transfer into computer memory. Firmware-controlled hardware shifts the bytes in the data field in response to information provided concerning the location of the most significant byte in memory relative to the boundaries of the data word and the length of the data word. The firmware can also directly specify the amount of the shift.
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