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Efficient method for mode change detection and synchronization

  • US 6,898,697 B1
  • Filed: 03/29/2002
  • Issued: 05/24/2005
  • Est. Priority Date: 03/29/2002
  • Status: Active Grant
First Claim
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1. A method comprising:

  • detecting a control transfer operation in a processor;

    determining whether an operating mode of the processor changes from a first mode to a second mode in response to execution of the transfer operation;

    performing a first check in response to detecting the operating mode is the first mode as a result of the transfer operation; and

    performing a second check in response to detecting the operating mode is the second mode as a result of the transfer operation;

    wherein the first check comprises a limit check and the second check comprises a canonical check; and

    flushing a pipeline of the processor in response to detecting the operating mode of the processor changes as a result of the operation.

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