Method and apparatus for the transparent emulation of an existing instruction-set architecture by an arbitrary underlying instruction-set architecture
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Apr 13, 1995
filing date -
Apr 13, 1995
priority date (Note) -
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Abstract
The invention provides means and methods for extending an instruction-set architecture without impacting the software interface. This circumvents all software compatibility issues, and allows legacy software to benefit from new architectural extensions without recompilation and reassembly. The means employed are a translation engine for translating sequences of old architecture instructions into primary, new architecture instructions, and an extended instruction (EI) cache memory for storing the translations. A processor requesting a sequence of instructions will look first to the EI-cache for a translation, and if translations are unavailable, will look to a conventional cache memory for the sequence, and finally, if still unavailable, will look to a main memory.
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