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Properly handle debug values during inline spilling.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107503 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-07-02 19:54:40 +00:00
parent 135d7fe9bb
commit 3b9c7ebc44
1 changed files with 32 additions and 13 deletions
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45
lib/CodeGen/InlineSpiller.cpp
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@ -245,20 +245,21 @@ void InlineSpiller::reMaterializeAll() {
return;
// Removing values may cause debug uses where li_ is not live.
for (MachineRegisterInfo::use_iterator
RI = mri_.use_begin(li_->reg), RE = mri_.use_end(); RI != RE;) {
MachineOperand &MO = RI.getOperand();
MachineInstr *MI = MO.getParent();
++RI;
SlotIndex UseIdx = lis_.getInstructionIndex(MI).getUseIndex();
DEBUG(dbgs() << "\tremaining use: " << UseIdx << '\t' << *MI);
if (li_->liveAt(UseIdx))
for (MachineRegisterInfo::use_iterator RI = mri_.use_begin(li_->reg);
MachineInstr *MI = RI.skipInstruction();) {
if (!MI->isDebugValue())
continue;
assert(MI->isDebugValue() && "Remaining non-debug use after remat dead.");
if (li_->empty())
MO.setIsUndef();
else
MO.setReg(0);
// Try to preserve the debug value if li_ is live immediately after it.
MachineBasicBlock::iterator NextMI = MI;
++NextMI;
if (NextMI != MI->getParent()->end() && !lis_.isNotInMIMap(NextMI)) {
SlotIndex NearIdx = lis_.getInstructionIndex(NextMI);
if (li_->liveAt(NearIdx))
continue;
}
DEBUG(dbgs() << "Removing debug info due to remat:" << "\t" << *MI);
assert(&*RI != MI && "Multiple register operands on debug value");
MI->eraseFromParent();
}
}
@ -348,6 +349,24 @@ void InlineSpiller::spill(LiveInterval *li,
for (MachineRegisterInfo::reg_iterator RI = mri_.reg_begin(li->reg);
MachineInstr *MI = RI.skipInstruction();) {
// Debug values are not allowed to affect codegen.
if (MI->isDebugValue()) {
// Modify DBG_VALUE now that the value is in a spill slot.
uint64_t Offset = MI->getOperand(1).getImm();
const MDNode *MDPtr = MI->getOperand(2).getMetadata();
DebugLoc DL = MI->getDebugLoc();
if (MachineInstr *NewDV = tii_.emitFrameIndexDebugValue(mf_, stackSlot_,
Offset, MDPtr, DL)) {
DEBUG(dbgs() << "Modifying debug info due to spill:" << "\t" << *MI);
MachineBasicBlock *MBB = MI->getParent();
MBB->insert(MBB->erase(MI), NewDV);
} else {
DEBUG(dbgs() << "Removing debug info due to spill:" << "\t" << *MI);
MI->eraseFromParent();
}
continue;
}
// Analyze instruction.
bool Reads, Writes;
SmallVector<unsigned, 8> Ops;