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cpu: add more comments to looppoint_analysis.cc

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Change-Id: I027db66ffed0cd5957bae2a9a36286ca1c73c313
This commit is contained in:
studyztp
2024-08-07 08:43:36 -07:00
committed by Bobby R. Bruce
parent a1072357c1
commit 753d9971d2
1 changed files with 23 additions and 4 deletions
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27
src/cpu/simple/probes/looppoint_analysis.cc
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@@ -87,13 +87,17 @@ LooppointAnalysis::checkPc(const std::pair<SimpleThread*,
if (lpaManager->ifEncountered(pc))
{
// if we have already encountered this pc, we should already
// categorized it
if (lpaManager->ifValidNotControl(pc))
{
lpaManager->incrementGlobalInstCounter();
// if it is categorized as a valid not control instruction
bbInstCounter++;
lpaManager->incrementGlobalInstCounter();
}
else if (lpaManager->ifValidControl(pc))
{
// if it is categorized as a valid control instruction
bbInstCounter ++;
lpaManager->incrementGlobalInstCounter();
lpaManager->updateBBInstMap(pc, bbInstCounter);
@@ -102,27 +106,33 @@ LooppointAnalysis::checkPc(const std::pair<SimpleThread*,
bbInstCounter = 0;
if (lpaManager->ifBackwardBranch(pc))
{
// if it is categorized as a backward branch
lpaManager->countBackwardBranch(pc);
}
}
return;
}
lpaManager->updateEncountered(pc);
if (inst->isMicroop() && !inst->isLastMicroop())
if (inst->isMicroop() && !inst->isLastMicroop())
{
// ignore this if it is a microop
return;
}
lpaManager->updateEncountered(pc);
// if we have not encountered this pc before, we should now update it to
// the corresponding category
if (!thread->getIsaPtr()->inUserMode())
{
// ignore this if it is not in user mode
return;
}
if (bbValidAddrRange.end() > 0 &&
(pc < bbValidAddrRange.start() || pc > bbValidAddrRange.end()))
{
// ignore this if it is not in the valid address range
return;
}
@@ -133,6 +143,7 @@ LooppointAnalysis::checkPc(const std::pair<SimpleThread*,
if (pc >= bbExcludedAddrRanges[i].start() &&
pc <= bbExcludedAddrRanges[i].end())
{
// ignore this if it is in the excluded address range
return;
}
}
@@ -143,6 +154,8 @@ LooppointAnalysis::checkPc(const std::pair<SimpleThread*,
if (inst->isControl())
{
// if it is a control instruction, we see it as the end of a basic
// block
lpaManager->updateValidControl(pc);
lpaManager->updateBBInstMap(pc, bbInstCounter);
updateLocalBBV(pc);
@@ -153,6 +166,8 @@ LooppointAnalysis::checkPc(const std::pair<SimpleThread*,
(pc < markerValidAddrRange.start() || pc > markerValidAddrRange.end())
)
{
// if it is not in the marker valid address range, we do not
// consider it as a possible marker used loop branch instruction
return;
}
@@ -231,6 +246,10 @@ LooppointAnalysisManager::countBackwardBranch(const Addr pc)
if (globalInstCounter >= regionLength)
{
// note that we do not reset any counter here but only raise an
// exit event.
// we can reset the counters through the simulation script using
// the helper functions in the LooppointAnalysisManager class
exitSimLoopNow("simpoint starting point found");
}
}