Data processing apparatus and method employing collision detection and prediction
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United States of America Patent
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Jul 26, 1988
Issued Date -
N/A
app pub date -
Sep 15, 1986
filing date -
Jul 11, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A data processing system for processing a sequence of program instructions has a pipeline structure including an instruction pipeline and an execution pipeline. Each pipeline has a plurality of serially operating stages. The stages read from and modify memory at various stages of instruction processing. Collisions between data read from a register in the instruction pipeline phase of operation in response to a first instruction and write data written into the register during the execution phase of operation in response to an earlier instruction can be detected and predicted. In response thereto, the new data can be substituted directly for the modified data in the pipeline itself to provide continued valid operation. In addition, the apparatus and method provide for altering the flow of the instructions through the pipeline in order to accommodate newly generated data and to avoid invalid operation.
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