| 摘要 |
The PIP system comprises a plurality of condition code generation units, each having a counter section and an operating section for operating the counter section in the event of generation of a condition code. A condition-code-updating instruction discrimination unit discriminates, in response to every instruction, one of the condition code generation units which is to generate a condition code, holds a result of the discrimination, and operates one of the counter sections associated with the result of the discrimination. A condition code determination decision unit identifies counts held by the pluraliry of counter sections and the result of the discrimination to produce a signal indicative of a determined state of a condition code and a condition code. …<??>This system achieves fast execution of condition code reference instructions and is capable of seeing whether or not a condition code has been determined by constantly monitoring a condition code generation mechanism which is used by the latest condition code update instruction being executed on the pipeline. As a result, a subsequent condition-code-reference-instruction need not await the determination of the condition code of the previous instruction executed. |
