Out-of-order execution using encoded dependencies between instructions in queues to determine stall values that control issurance of instructions from the queues
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United States of America Patent
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Aug 24, 1999
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N/A
app pub date -
Jun 24, 1997
filing date -
Jun 24, 1997
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Abstract
A method for executing instructions out-of-order to improve performance of a processor includes compiling the instructions of a program into separate queues along with encoded dependencies between instructions in the different queues. The processor then issues instructions from each of these queues independently, except that it enforces the encoded dependencies among instructions from different queues. If an instruction is dependent on instructions in other queues, the processor waits to issue it until the instructions on which it depends are issued. The processor includes a stall unit, comprised of a number of instruction counters for each queue, that enforces the dependencies between instructions in different queues.
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