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MI Sched: track register pressure by importance of the set, not weight of the units.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187109 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2013-07-25 07:26:32 +00:00
parent bba663e30a
commit 4b43ed53b6
1 changed files with 20 additions and 14 deletions
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34
lib/CodeGen/RegisterPressure.cpp
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@@ -553,9 +553,10 @@ static void computeExcessPressureDelta(ArrayRef<unsigned> OldPressureVec,
else if (Limit > PNew) else if (Limit > PNew)
PDiff = Limit - POld; // Just obeyed limit. PDiff = Limit - POld; // Just obeyed limit.
if (std::abs(PDiff) > std::abs(ExcessUnits)) { if (PDiff) {
ExcessUnits = PDiff; ExcessUnits = PDiff;
PSetID = i; PSetID = i;
break;
} }
} }
Delta.Excess.PSetID = PSetID; Delta.Excess.PSetID = PSetID;
@@ -583,23 +584,28 @@ static void computeMaxPressureDelta(ArrayRef<unsigned> OldMaxPressureVec,
if (PNew == POld) // No change in this set in the common case. if (PNew == POld) // No change in this set in the common case.
continue; continue;
while (CritIdx != CritEnd && CriticalPSets[CritIdx].PSetID < i) if (!Delta.CriticalMax.isValid()) {
++CritIdx; while (CritIdx != CritEnd && CriticalPSets[CritIdx].PSetID < i)
++CritIdx;
if (CritIdx != CritEnd && CriticalPSets[CritIdx].PSetID == i) { if (CritIdx != CritEnd && CriticalPSets[CritIdx].PSetID == i) {
int PDiff = (int)PNew - (int)CriticalPSets[CritIdx].UnitIncrease; int PDiff = (int)PNew - (int)CriticalPSets[CritIdx].UnitIncrease;
if (PDiff > Delta.CriticalMax.UnitIncrease) { if (PDiff > 0) {
Delta.CriticalMax.PSetID = i; Delta.CriticalMax.PSetID = i;
Delta.CriticalMax.UnitIncrease = PDiff; Delta.CriticalMax.UnitIncrease = PDiff;
}
} }
} }
// Find the first increase above MaxPressureLimit.
// Find the greatest increase above MaxPressureLimit.
// (Ignores negative MDiff). // (Ignores negative MDiff).
int MDiff = (int)PNew - (int)MaxPressureLimit[i]; if (!Delta.CurrentMax.isValid()) {
if (MDiff > Delta.CurrentMax.UnitIncrease) { int MDiff = (int)PNew - (int)MaxPressureLimit[i];
Delta.CurrentMax.PSetID = i; if (MDiff > 0) {
Delta.CurrentMax.UnitIncrease = MDiff; Delta.CurrentMax.PSetID = i;
Delta.CurrentMax.UnitIncrease = MDiff;
if (CritIdx == CritEnd || Delta.CriticalMax.isValid())
break;
}
} }
} }
} }