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Avoid being influenced by the presence of dbg_value instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99879 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-03-30 05:49:07 +00:00
parent cebf5bc2ee
commit 28a1e48690
2 changed files with 28 additions and 8 deletions
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17
lib/CodeGen/LiveIntervalAnalysis.cpp
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@@ -819,8 +819,9 @@ bool LiveIntervals::isReMaterializable(const LiveInterval &li,
unsigned ImpUse = getReMatImplicitUse(li, MI);
if (ImpUse) {
const LiveInterval &ImpLi = getInterval(ImpUse);
for (MachineRegisterInfo::use_iterator ri = mri_->use_begin(li.reg),
re = mri_->use_end(); ri != re; ++ri) {
for (MachineRegisterInfo::use_nodbg_iterator
ri = mri_->use_nodbg_begin(li.reg), re = mri_->use_nodbg_end();
ri != re; ++ri) {
MachineInstr *UseMI = &*ri;
SlotIndex UseIdx = getInstructionIndex(UseMI);
if (li.FindLiveRangeContaining(UseIdx)->valno != ValNo)
@@ -1052,7 +1053,7 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
// all of its uses are rematerialized, simply delete it.
if (MI == ReMatOrigDefMI && CanDelete) {
DEBUG(dbgs() << "\t\t\t\tErasing re-materializable def: "
<< MI << '\n');
<< *MI << '\n');
RemoveMachineInstrFromMaps(MI);
vrm.RemoveMachineInstrFromMaps(MI);
MI->eraseFromParent();
@@ -1520,6 +1521,12 @@ LiveIntervals::handleSpilledImpDefs(const LiveInterval &li, VirtRegMap &vrm,
MachineOperand &O = ri.getOperand();
MachineInstr *MI = &*ri;
++ri;
if (MI->isDebugValue()) {
// Remove debug info for now.
O.setReg(0U);
DEBUG(dbgs() << "Removing debug info due to spill:" << "\t" << *MI);
continue;
}
if (O.isDef()) {
assert(MI->isImplicitDef() &&
"Register def was not rewritten?");
@@ -2012,6 +2019,8 @@ unsigned LiveIntervals::getNumConflictsWithPhysReg(const LiveInterval &li,
E = mri_->reg_end(); I != E; ++I) {
MachineOperand &O = I.getOperand();
MachineInstr *MI = O.getParent();
if (MI->isDebugValue())
continue;
SlotIndex Index = getInstructionIndex(MI);
if (pli.liveAt(Index))
++NumConflicts;
@@ -2052,7 +2061,7 @@ bool LiveIntervals::spillPhysRegAroundRegDefsUses(const LiveInterval &li,
E = mri_->reg_end(); I != E; ++I) {
MachineOperand &O = I.getOperand();
MachineInstr *MI = O.getParent();
if (SeenMIs.count(MI))
if (MI->isDebugValue() || SeenMIs.count(MI))
continue;
SeenMIs.insert(MI);
SlotIndex Index = getInstructionIndex(MI);