Lookahead instruction fetch processing for improved emulated instruction performance
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United States of America Patent
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Issued Date -
Jan 11, 2007
app pub date -
Jul 5, 2005
filing date -
Jul 5, 2005
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Abandoned
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Abstract
In order to avoid hardware pipeline breaks and also to enhance performance when emulating a target system in a host system employing a central processing unit including a plurality of execution units, three major pieces of processing that are required for handling every emulated instruction are overlapped. This overlap includes: 1) the instruction fetch of the emulated instruction by the emulation software, 2) the branching of the emulation code based upon the opcode of the emulated instruction to be executed and 3) the actual execution processing for each emulated instruction. The branching of the emulation code, depending upon the opcode of each instruction, utilizes special instructions configured to minimize pipeline breaks on the host system hardware and thus to minimize the effective minimum host system processing time for the simplest emulated instructions.
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