cpu-minor: Integrate Minor's executeStats with int/fp/vec ALU Accesses

[poal023]

Amending my previous iteration of the commit #1107, to add ALU access stats under Minor's execute stats so users can check ALU ops per thread.

[mattsinc]

This seems reasonable to me, but we should wait for @powerjg or someone from Davis to chime in before we merge.

[hnpl]

I don't know if those stats count accesses from speculative instructions. If that's the case then we should move this to the execute stage. If not, this change looks good to me!

If we count all Functional Unit accesses, the issue logic inside the execute stage seems to be the best place for updating the stats,

gem5/src/cpu/minor/execute.cc

Line 607 in 1153223

DPRINTF(MinorExecute, "Trying to issue inst: %s to FU: %d\n",

[powerjg]

I agree with Hoa about speculative instructions and putting the execute stats in the execute stage instead of the commit stage.

Furthermore, there are many other CPU stats that are missing from the minor CPU. Maybe we could add them all at once?

[powerjg]

Why do you need to check isInst()? How could that be false?

[poal023]

I initially put that in the issue logic (in the issue function), since doing inst->staticInst->isInteger() would segfault without it. Otherwise, I'll take it out.

Only question I have about adding additional stats from base.cc of the base CPU is, does Minor have an equivalent execcontext? I noticed that within BaseExecContext, there are specific stats that are updated (such as numCallsReturns, which I assume I'd have to do something similar and create an exec context to access the thread's info, although there could be a better approach?