Method of modifying an instruction set architecture of a computer processor to maintain backward compatibility
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United States of America Patent
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Dec 23, 1997
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N/A
app pub date -
Sep 19, 1995
filing date -
Sep 19, 1995
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Abstract
A method of processor architecture modification includes the step of defining an instruction set architecture for a current generation processor. Reserved within this definition are a set of instructions which perform no-operations (NOPs), have no attached semantics, and do not change any architectural state of the processor. Software code, compatible with the instruction set architecture, is then written for running on the processor. In a next-generation processor, new functionality is added by defining a semantic for one of the NOPs so that programs which utilize the new instruction run on both the current-generation and the next-generation processors.
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