发明授权
US5634023A Software mechanism for accurately handling exceptions generated by
speculatively scheduled instructions
失效
用于准确处理由推测性安排的指令产生的异常的软件机制
- 专利标题: Software mechanism for accurately handling exceptions generated by speculatively scheduled instructions
- 专利标题(中): 用于准确处理由推测性安排的指令产生的异常的软件机制
-
申请号: US270184申请日: 1994-07-01
-
公开(公告)号: US5634023A公开(公告)日: 1997-05-27
- 发明人: Michael C. Adler , Steven O. Hobbs , Paul G. Lowney
- 申请人: Michael C. Adler , Steven O. Hobbs , Paul G. Lowney
- 申请人地址: MA Maynard
- 专利权人: Digital Equipment Corporation
- 当前专利权人: Digital Equipment Corporation
- 当前专利权人地址: MA Maynard
- 主分类号: G06F9/38
- IPC分类号: G06F9/38 ; G06F9/30 ; G06F15/16
摘要:
Methods for handling exceptions caused by speculatively scheduled instructions or predicated instructions executed within a computer program are described. The method for speculatively scheduled instructions includes checking at a commit point of a speculatively scheduled instruction, a semaphore associated with the speculatively scheduled instruction and branching to an error handling routine in the semaphore is set. A set semaphore indicates that an exception occurred when the speculatively scheduled instruction was executed. For a predicated instruction the method includes checking a predicate of a eliminated branch and a semaphore associated with the speculative instruction at a commit point of the speculative instruction and branching to an error handing routine if the semaphore indicates that an exception occurred when the speculative instruction was executed, and the predicate is true, which indicates that the speculative instruction was properly executed.
公开/授权文献
信息查询