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misched: tracing register pressure heuristics. 

llvm-svn: 156575
This commit is contained in:
Andrew Trick 2012-05-10 21:06:19 +00:00
parent 7ee9de51f2
commit 419eae2db7
1 changed files with 22 additions and 6 deletions
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28
llvm/lib/CodeGen/MachineScheduler.cpp
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@ -724,11 +724,28 @@ public:
BotQueue.push(SU);
}
protected:
#ifndef NDEBUG
void traceCandidate(const char *Label, unsigned QID, SUnit *SU,
int RPDiff, unsigned PSetID);
#endif
bool pickNodeFromQueue(ReadyQ &Q, const RegPressureTracker &RPTracker,
SchedCandidate &Candidate);
};
} // namespace
#ifndef NDEBUG
void ConvergingScheduler::
traceCandidate(const char *Label, unsigned QID, SUnit *SU,
int RPDiff, unsigned PSetID) {
dbgs() << Label << getQName(QID) << " ";
if (RPDiff)
dbgs() << TRI->getRegPressureSetName(PSetID) << ":" << RPDiff << " ";
else
dbgs() << " ";
SU->dump(DAG);
}
#endif
/// Pick the best candidate from the top queue.
///
/// TODO: getMaxPressureDelta results can be mostly cached for each SUnit during
@ -749,6 +766,8 @@ bool ConvergingScheduler::pickNodeFromQueue(ReadyQ &Q,
// Avoid exceeding the target's limit.
if (!Candidate.SU || RPDelta.ExcessUnits < Candidate.RPDelta.ExcessUnits) {
DEBUG(traceCandidate(Candidate.SU ? "PCAND" : "ACAND", Q.ID, *I,
RPDelta.ExcessUnits, RPDelta.ExcessSetID));
Candidate.SU = *I;
Candidate.RPDelta = RPDelta;
FoundCandidate = true;
@ -759,15 +778,11 @@ bool ConvergingScheduler::pickNodeFromQueue(ReadyQ &Q,
// Avoid increasing the max pressure.
if (RPDelta.MaxUnitIncrease < Candidate.RPDelta.MaxUnitIncrease) {
DEBUG(traceCandidate("MCAND", Q.ID, *I,
RPDelta.ExcessUnits, RPDelta.ExcessSetID));
Candidate.SU = *I;
Candidate.RPDelta = RPDelta;
FoundCandidate = true;
DEBUG(dbgs() << "CAND " << getQName(Q.ID) << " ";
if (RPDelta.MaxUnitIncrease)
dbgs() << TRI->getRegPressureSetName(RPDelta.MaxSetID) << ":"
<< RPDelta.MaxUnitIncrease << " ";
(*I)->dump(DAG); dbgs() << "\n");
continue;
}
if (RPDelta.MaxUnitIncrease > Candidate.RPDelta.MaxUnitIncrease)
@ -780,6 +795,7 @@ bool ConvergingScheduler::pickNodeFromQueue(ReadyQ &Q,
if ((Q.ID == TopQID && (*I)->NodeNum < Candidate.SU->NodeNum)
|| (Q.ID == BotQID && (*I)->NodeNum > Candidate.SU->NodeNum)) {
DEBUG(traceCandidate("NCAND", Q.ID, *I, 0, 0));
Candidate.SU = *I;
Candidate.RPDelta = RPDelta;
FoundCandidate = true;