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mi-sched: cleanup register pressure update, remove a FIXME.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190181 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-09-06 17:32:47 +00:00
parent 6bf0c6c535
commit fb386db636
3 changed files with 32 additions and 20 deletions
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3
include/llvm/CodeGen/MachineScheduler.h
View File

@ -413,7 +413,8 @@ protected:
void updatePressureDiffs(ArrayRef<unsigned> LiveUses);
void updateScheduledPressure(const std::vector<unsigned> &NewMaxPressure);
void updateScheduledPressure(const SUnit *SU,
const std::vector<unsigned> &NewMaxPressure);
bool checkSchedLimit();

4
include/llvm/CodeGen/RegisterPressure.h
View File

@ -145,6 +145,8 @@ public:
typedef const PressureChange* const_iterator;
iterator begin() { return &PressureChanges[0]; }
iterator end() { return &PressureChanges[MaxPSets]; }
const_iterator begin() const { return &PressureChanges[0]; }
const_iterator end() const { return &PressureChanges[MaxPSets]; }
void addPressureChange(unsigned RegUnit, bool IsDec,
const MachineRegisterInfo *MRI);
@ -159,6 +161,8 @@ public:
PressureDiffs(): PDiffArray(0), Size(0), Max(0) {}
~PressureDiffs() { free(PDiffArray); }
void clear() { Size = 0; }
void init(unsigned N);
PressureDiff &operator[](unsigned Idx) {

45
lib/CodeGen/MachineScheduler.cpp
View File

@ -484,6 +484,8 @@ void ScheduleDAGMI::enterRegion(MachineBasicBlock *bb,
LiveRegionEnd =
(RegionEnd == bb->end()) ? RegionEnd : llvm::next(RegionEnd);
SUPressureDiffs.clear();
SchedImpl->initPolicy(begin, end, regioninstrs);
ShouldTrackPressure = SchedImpl->shouldTrackPressure();
@ -551,25 +553,30 @@ void ScheduleDAGMI::initRegPressure() {
dbgs() << "\n");
}
// FIXME: When the pressure tracker deals in pressure differences then we won't
// iterate over all RegionCriticalPSets[i].
void ScheduleDAGMI::
updateScheduledPressure(const std::vector<unsigned> &NewMaxPressure) {
for (unsigned i = 0, e = RegionCriticalPSets.size(); i < e; ++i) {
unsigned ID = RegionCriticalPSets[i].getPSet();
if ((int)NewMaxPressure[ID] > RegionCriticalPSets[i].getUnitInc()
&& NewMaxPressure[ID] <= INT16_MAX)
RegionCriticalPSets[i].setUnitInc(NewMaxPressure[ID]);
updateScheduledPressure(const SUnit *SU,
const std::vector<unsigned> &NewMaxPressure) {
const PressureDiff &PDiff = getPressureDiff(SU);
unsigned CritIdx = 0, CritEnd = RegionCriticalPSets.size();
for (PressureDiff::const_iterator I = PDiff.begin(), E = PDiff.end();
I != E; ++I) {
if (!I->isValid())
break;
unsigned ID = I->getPSet();
while (CritIdx != CritEnd && RegionCriticalPSets[CritIdx].getPSet() < ID)
++CritIdx;
if (CritIdx != CritEnd && RegionCriticalPSets[CritIdx].getPSet() == ID) {
if ((int)NewMaxPressure[ID] > RegionCriticalPSets[CritIdx].getUnitInc()
&& NewMaxPressure[ID] <= INT16_MAX)
RegionCriticalPSets[CritIdx].setUnitInc(NewMaxPressure[ID]);
}
unsigned Limit = RegClassInfo->getRegPressureSetLimit(ID);
if (NewMaxPressure[ID] >= Limit - 2) {
DEBUG(dbgs() << " " << TRI->getRegPressureSetName(ID) << ": "
<< NewMaxPressure[ID] << " > " << Limit << "(+ "
<< BotRPTracker.getLiveThru()[ID] << " livethru)\n");
}
}
DEBUG(
for (unsigned i = 0, e = NewMaxPressure.size(); i < e; ++i) {
unsigned Limit = RegClassInfo->getRegPressureSetLimit(i);
if (NewMaxPressure[i] > Limit ) {
dbgs() << " " << TRI->getRegPressureSetName(i) << ": "
<< NewMaxPressure[i] << " > " << Limit << "(+ "
<< BotRPTracker.getLiveThru()[i] << " livethru)\n";
}
});
}
/// Update the PressureDiff array for liveness after scheduling this
@ -866,7 +873,7 @@ void ScheduleDAGMI::scheduleMI(SUnit *SU, bool IsTopNode) {
// Update top scheduled pressure.
TopRPTracker.advance();
assert(TopRPTracker.getPos() == CurrentTop && "out of sync");
updateScheduledPressure(TopRPTracker.getPressure().MaxSetPressure);
updateScheduledPressure(SU, TopRPTracker.getPressure().MaxSetPressure);
}
}
else {
@ -888,8 +895,8 @@ void ScheduleDAGMI::scheduleMI(SUnit *SU, bool IsTopNode) {
SmallVector<unsigned, 8> LiveUses;
BotRPTracker.recede(&LiveUses);
assert(BotRPTracker.getPos() == CurrentBottom && "out of sync");
updateScheduledPressure(SU, BotRPTracker.getPressure().MaxSetPressure);
updatePressureDiffs(LiveUses);
updateScheduledPressure(BotRPTracker.getPressure().MaxSetPressure);
}
}
}