Using two barrel shifters to implement shift, rotate, rotate with carry, and shift double as specified by the X86 architecture
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United States of America Patent
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Oct 16, 2001
Grant Date -
N/A
app pub date -
Mar 25, 1999
filing date -
Mar 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A novel method and apparatus of performing data bit moving functions on a data word using two barrel shifters: a left shifter and a right shifter. The present invention is able to handle both shift and rotate functions using one shifter unit. Specifically, for shift functions, only one of the two shifters is used to perform the shifting function. On the other hand, for rotate functions, both shifters are needed for shifting the data word. The amounts of the right shift and left shift depend on the number defined by the count operand and the specific shift/rotate instruction requested.
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