Answer by Peter Cordes for How does the CPU know when to hold a pipeline...
First of all, x86-64 makes little sense as a tag for this. There are real ARM CPUs with 3-stage pipelines (e.g. Cortex-M), but no x86-64 CPU has ever been that short. x86 decode is too expensive for...
View ArticleHow does the CPU know when to hold a pipeline stage back?
How does the CPU check whether or not a pipeline stage is busy so it can hold all previous stages back? That is, in an example three stage pipeline, if stage 2 is taking multiple clock cycles and...
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