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The architecture definition of Speculatively executed

srLeslie

Hi everyone,

The Chapter Performance Monitors Extension in Arm ARM gives a definition "Speculatively executed", which says:

An instruction or operation that is counted by an event when it MIGHT be Speculative.

Sorry but I think this description is somehow ambiguous.

Form a u-architecture perspective, what information can I get from the *_SPEC events?

For instance, does INST_SPEC event just count all issued instructons?

Thanks in advance.