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Remove DBG_VALUE which reference dead stack slots.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102654 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-04-29 18:51:00 +00:00
parent a83ce98d5f
commit bd6cb4ba1f
1 changed files with 19 additions and 2 deletions
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21
lib/CodeGen/VirtRegRewriter.cpp
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@ -1066,6 +1066,7 @@ class LocalRewriter : public VirtRegRewriter {
VirtRegMap *VRM;
BitVector AllocatableRegs;
DenseMap<MachineInstr*, unsigned> DistanceMap;
DenseMap<int, SmallVector<MachineInstr*,4> > Slot2DbgValues;
MachineBasicBlock *MBB; // Basic block currently being processed.
@ -1190,12 +1191,24 @@ bool LocalRewriter::runOnMachineFunction(MachineFunction &MF, VirtRegMap &vrm,
// Mark unused spill slots.
MachineFrameInfo *MFI = MF.getFrameInfo();
int SS = VRM->getLowSpillSlot();
if (SS != VirtRegMap::NO_STACK_SLOT)
for (int e = VRM->getHighSpillSlot(); SS <= e; ++SS)
if (SS != VirtRegMap::NO_STACK_SLOT) {
for (int e = VRM->getHighSpillSlot(); SS <= e; ++SS) {
SmallVector<MachineInstr*, 4> &DbgValues = Slot2DbgValues[SS];
if (!VRM->isSpillSlotUsed(SS)) {
MFI->RemoveStackObject(SS);
for (unsigned j = 0, ee = DbgValues.size(); j != ee; ++j) {
MachineInstr *DVMI = DbgValues[j];
MachineBasicBlock *DVMBB = DVMI->getParent();
DEBUG(dbgs() << "Removing debug info referencing FI#" << SS << '\n');
VRM->RemoveMachineInstrFromMaps(DVMI);
DVMBB->erase(DVMI);
}
++NumDSS;
}
DbgValues.clear();
}
}
Slot2DbgValues.clear();
return true;
}
@ -1905,6 +1918,10 @@ LocalRewriter::RewriteMBB(LiveIntervals *LIs,
bool BackTracked = false;
MachineInstr &MI = *MII;
// Remember DbgValue's which reference stack slots.
if (MI.isDebugValue() && MI.getOperand(0).isFI())
Slot2DbgValues[MI.getOperand(0).getIndex()].push_back(&MI);
/// ReusedOperands - Keep track of operand reuse in case we need to undo
/// reuse.
ReuseInfo ReusedOperands(MI, TRI);