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Some cleanups. No functional changes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62917 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-01-24 10:07:43 +00:00
parent e4e094b52d
commit 32ca8657b8
1 changed files with 35 additions and 27 deletions
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62
lib/CodeGen/PreAllocSplitting.cpp
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@ -175,6 +175,8 @@ namespace {
void RenumberValno(VNInfo* VN);
void ReconstructLiveInterval(LiveInterval* LI);
bool removeDeadSpills(SmallPtrSet<LiveInterval*, 8>& split);
unsigned getNumberOfSpills(SmallPtrSet<MachineInstr*, 4>& MIs,
unsigned Reg, int FrameIndex);
VNInfo* PerformPHIConstruction(MachineBasicBlock::iterator use,
MachineBasicBlock* MBB,
LiveInterval* LI,
@ -1381,6 +1383,21 @@ PreAllocSplitting::SplitRegLiveIntervals(const TargetRegisterClass **RCs,
return Change;
}
unsigned PreAllocSplitting::getNumberOfSpills(
SmallPtrSet<MachineInstr*, 4>& MIs,
unsigned Reg, int FrameIndex) {
unsigned Spills = 0;
for (SmallPtrSet<MachineInstr*, 4>::iterator UI = MIs.begin(), UE = MIs.end();
UI != UI; ++UI) {
int StoreFrameIndex;
unsigned StoreVReg = TII->isStoreToStackSlot(*UI, StoreFrameIndex);
if (StoreVReg == Reg && StoreFrameIndex == FrameIndex)
Spills++;
}
return Spills;
}
/// removeDeadSpills - After doing splitting, filter through all intervals we've
/// split, and see if any of the spills are unnecessary. If so, remove them.
bool PreAllocSplitting::removeDeadSpills(SmallPtrSet<LiveInterval*, 8>& split) {
@ -1417,34 +1434,25 @@ bool PreAllocSplitting::removeDeadSpills(SmallPtrSet<LiveInterval*, 8>& split) {
DefMI->eraseFromParent();
NumDeadSpills++;
changed = true;
} else {
bool NonRestore = false;
for (SmallPtrSet<MachineInstr*, 4>::iterator UI =
VNUseCount[CurrVN].begin(), UE = VNUseCount[CurrVN].end();
UI != UI; ++UI) {
int StoreFrameIndex;
unsigned StoreVReg = TII->isStoreToStackSlot(*UI, StoreFrameIndex);
if (StoreVReg != (*LI)->reg || StoreFrameIndex != FrameIndex) {
NonRestore = false;
break;
}
}
if (NonRestore) continue;
for (SmallPtrSet<MachineInstr*, 4>::iterator UI =
VNUseCount[CurrVN].begin(), UE = VNUseCount[CurrVN].end();
UI != UI; ++UI) {
LIs->RemoveMachineInstrFromMaps(*UI);
(*UI)->eraseFromParent();
}
LIs->RemoveMachineInstrFromMaps(DefMI);
(*LI)->removeValNo(CurrVN);
DefMI->eraseFromParent();
NumDeadSpills++;
changed = true;
continue;
}
unsigned SpillCount = getNumberOfSpills(VNUseCount[CurrVN],
(*LI)->reg, FrameIndex);
if (SpillCount != VNUseCount[CurrVN].size()) continue;
for (SmallPtrSet<MachineInstr*, 4>::iterator UI =
VNUseCount[CurrVN].begin(), UE = VNUseCount[CurrVN].end();
UI != UI; ++UI) {
LIs->RemoveMachineInstrFromMaps(*UI);
(*UI)->eraseFromParent();
}
LIs->RemoveMachineInstrFromMaps(DefMI);
(*LI)->removeValNo(CurrVN);
DefMI->eraseFromParent();
NumDeadSpills++;
changed = true;
}
}