发明名称 |
UNALIGNED MEMORY ACCESS PREDICTION |
摘要 |
In an instruction execution pipeline, the misalignment of memory access instructions is predicted. Based on the prediction, an additional micro-operation is generated in the pipeline prior to the effective address generation of the memory access instruction. The additional micro-operation accesses the memory falling across a predetermined address boundary. Predicting the misalignment and generating a micro-operation early in the pipeline ensures that sufficient pipeline control resources are available to generate and track the additional micro-operation, avoiding a pipeline flush if the resources are not available at the time of effective address generation. The misalignment prediction may employ known conditional branch prediction techniques, such as a flag, a bimodal counter, a local predictor, a global predictor, and combined predictors. A misalignment predictor may be enabled or biased by a memory access instruction flag or misaligned instruction type. |
申请公布号 |
WO2006089194(A3) |
申请公布日期 |
2007.03.29 |
申请号 |
WO2006US05782 |
申请日期 |
2006.02.16 |
申请人 |
QUALCOMM INCORPORATED;BRIDGES, JEFFREY TODD;AUGSBURG, VICTOR ROBERTS;DIEFFENDERFER, JAMES NORRIS;SARTORIUS, THOMAS ANDREW |
发明人 |
BRIDGES, JEFFREY TODD;AUGSBURG, VICTOR ROBERTS;DIEFFENDERFER, JAMES NORRIS;SARTORIUS, THOMAS ANDREW |
分类号 |
G06F9/312;G06F9/318;G06F9/38 |
主分类号 |
G06F9/312 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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