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Discard split intervals made empty due to folding. 

llvm-svn: 44565
This commit is contained in:
Evan Cheng 2007-12-04 00:32:23 +00:00
parent ee695a3456
commit d1badb960e
1 changed files with 16 additions and 5 deletions
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21
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -1234,6 +1234,7 @@ addIntervalsForSpills(const LiveInterval &li,
for (unsigned i = 0, e = spills.size(); i != e; ++i) {
int index = spills[i].index;
unsigned VReg = spills[i].vreg;
LiveInterval &nI = getOrCreateInterval(VReg);
bool isReMat = vrm.isReMaterialized(VReg);
MachineInstr *MI = getInstructionFromIndex(index);
bool CanFold = false;
@ -1269,6 +1270,7 @@ addIntervalsForSpills(const LiveInterval &li,
if (FoundUse > 0)
// Also folded uses, do not issue a load.
eraseRestoreInfo(Id, index, VReg, RestoreMBBs, RestoreIdxes);
nI.removeRange(getDefIndex(index), getStoreIndex(index));
}
}
@ -1288,6 +1290,7 @@ addIntervalsForSpills(const LiveInterval &li,
if (index == -1)
continue;
unsigned VReg = restores[i].vreg;
LiveInterval &nI = getOrCreateInterval(VReg);
MachineInstr *MI = getInstructionFromIndex(index);
bool CanFold = false;
Ops.clear();
@ -1326,15 +1329,23 @@ addIntervalsForSpills(const LiveInterval &li,
}
// If folding is not possible / failed, then tell the spiller to issue a
// load / rematerialization for us.
if (!Folded)
if (Folded)
nI.removeRange(getLoadIndex(index), getUseIndex(index)+1);
else
vrm.addRestorePoint(VReg, MI);
}
Id = RestoreMBBs.find_next(Id);
}
// Finalize spill weights.
for (unsigned i = 0, e = NewLIs.size(); i != e; ++i)
NewLIs[i]->weight /= NewLIs[i]->getSize();
// Finalize spill weights and filter out dead intervals.
std::vector<LiveInterval*> RetNewLIs;
for (unsigned i = 0, e = NewLIs.size(); i != e; ++i) {
LiveInterval *LI = NewLIs[i];
if (!LI->empty()) {
LI->weight /= LI->getSize();
RetNewLIs.push_back(LI);
}
}
return NewLIs;
return RetNewLIs;
}