Remove DBG_VALUE which reference dead stack slots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102654 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/VirtRegRewriter.cpp b/lib/CodeGen/VirtRegRewriter.cpp
index ac00194..7f0412c 100644
--- a/lib/CodeGen/VirtRegRewriter.cpp
+++ b/lib/CodeGen/VirtRegRewriter.cpp
@@ -1066,6 +1066,7 @@
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 @@
// 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 @@
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);