Processor E-unit to I-unit interface instruction modification with E-unit opcode computer logic in the unit
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United States of America Patent
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Jan 23, 2001
Grant Date -
N/A
app pub date -
Apr 30, 1998
filing date -
Apr 30, 1998
priority date (Note) -
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Abstract
A computer processor which has a apparatus in its Execution Unit (E-unit) that detects a match between an opcode about to be executed and opcodes programmed into it by the computer manufacturer provides a method for alleviating design deficiencies in the processor. The E-unit further contains a mechanism for transmitting the opcode and a desired action back to the Instruction Unit (I-unit) where it may be compared with the next instruction that is decoded. Furthermore, the E-unit opcode compare logic contains a mechanism for breaking infinite loops that may result. This E-unit opcode compare mechanism, may also be used for other purposes such as detecting invalid opcodes and other exception checking since it may allow for a faster cycle time of the processor than if this logic were implemented in the I-unit.
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