STOP WAITING FOR SOURCE OPERAND WHEN CONDITIONAL INSTRUCTION WILL NOT EXECUTE

摘要

The delay of non-executing conditional instructions, that would otherwise be imposed while waiting for late operand data, is alleviated based on an early recognition that such instructions will not execute on the current pass through a pipeline processor. At an appropriate point prior to execution, a determination regarding the condition is made. If the condition is such that the instruction will not execute on this pass through the pipeline, the hold with regard to the conditional instruction may be terminated, that is to say skipped or stopped prior to completion of receiving all the associated operand data. Flow of the non-executing instruction through the pipeline, for example, need not wait for an earlier instruction to compute and write source operand data for use by the conditional instruction.