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If a split live interval is spilled again, remove the kill marker on its last use.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44611 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-12-05 09:51:10 +00:00
parent f38d14f03e
commit adf8590690
3 changed files with 25 additions and 2 deletions
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5
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -1165,6 +1165,7 @@ addIntervalsForSpills(const LiveInterval &li,
// it's also guaranteed to be a single val# / range interval.
if (vrm.getPreSplitReg(li.reg)) {
vrm.setIsSplitFromReg(li.reg, 0);
vrm.removeKillPoint(li.reg);
bool DefIsReMat = vrm.isReMaterialized(li.reg);
Slot = vrm.getStackSlot(li.reg);
assert(Slot != VirtRegMap::MAX_STACK_SLOT);
@ -1398,8 +1399,10 @@ addIntervalsForSpills(const LiveInterval &li,
int UseIdx = LastUse->findRegisterUseOperandIdx(LI->reg);
assert(UseIdx != -1);
if (LastUse->getInstrDescriptor()->
getOperandConstraint(UseIdx, TOI::TIED_TO) == -1)
getOperandConstraint(UseIdx, TOI::TIED_TO) == -1) {
LastUse->getOperand(UseIdx).setIsKill();
vrm.addKillPoint(LI->reg, &LastUse->getOperand(UseIdx));
}
}
RetNewLIs.push_back(LI);
}

3
lib/CodeGen/VirtRegMap.cpp
View File

@ -64,7 +64,7 @@ VirtRegMap::VirtRegMap(MachineFunction &mf)
: TII(*mf.getTarget().getInstrInfo()), MF(mf),
Virt2PhysMap(NO_PHYS_REG), Virt2StackSlotMap(NO_STACK_SLOT),
Virt2ReMatIdMap(NO_STACK_SLOT), Virt2SplitMap(0),
ReMatMap(NULL), ReMatId(MAX_STACK_SLOT+1) {
Virt2SplitKillMap(NULL), ReMatMap(NULL), ReMatId(MAX_STACK_SLOT+1) {
grow();
}
@ -74,6 +74,7 @@ void VirtRegMap::grow() {
Virt2StackSlotMap.grow(LastVirtReg);
Virt2ReMatIdMap.grow(LastVirtReg);
Virt2SplitMap.grow(LastVirtReg);
Virt2SplitKillMap.grow(LastVirtReg);
ReMatMap.grow(LastVirtReg);
}

19
lib/CodeGen/VirtRegMap.h
View File

@ -66,6 +66,10 @@ namespace llvm {
/// mapping.
IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2SplitMap;
/// Virt2SplitKillMap - This is splitted virtual register to its last use
/// (kill) mapping.
IndexedMap<MachineOperand*> Virt2SplitKillMap;
/// ReMatMap - This is virtual register to re-materialized instruction
/// mapping. Each virtual register whose definition is going to be
/// re-materialized has an entry in it.
@ -210,6 +214,21 @@ namespace llvm {
ReMatMap[virtReg] = def;
}
/// @brief record the last use (kill) of a split virtual register.
void addKillPoint(unsigned virtReg, MachineOperand *Op) {
Virt2SplitKillMap[virtReg] = Op;
}
/// @brief reset and remove the last use (kill) of a split virtual register.
void removeKillPoint(unsigned virtReg) {
MachineOperand *MO = Virt2SplitKillMap[virtReg];
if (MO) {
assert(MO->isKill() && "Split last use is not marked kill?");
MO->unsetIsKill();
Virt2SplitKillMap[virtReg] = NULL;
}
}
/// @brief returns true if the specified MachineInstr is a spill point.
bool isSpillPt(MachineInstr *Pt) const {
return SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end();