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Only update LiveVariables if it is available. addIntervalsForSpills

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runs after the initial run of the live interval analysis.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16075 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-08-27 18:59:22 +00:00
parent ccdf21af1f
commit d8d26b3268
1 changed files with 12 additions and 9 deletions
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17
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -186,6 +186,10 @@ std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
VirtRegMap& vrm,
int slot)
{
// since this is called after the analysis is done we don't know if
// LiveVariables is available
lv_ = getAnalysisToUpdate<LiveVariables>();
std::vector<LiveInterval*> added;
assert(li.weight != HUGE_VAL &&
@ -212,8 +216,8 @@ std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
for (unsigned i = 0; i != mi->getNumOperands(); ++i) {
MachineOperand& mop = mi->getOperand(i);
if (mop.isRegister() && mop.getReg() == li.reg) {
if (MachineInstr* fmi =
mri_->foldMemoryOperand(mi, i, slot)) {
if (MachineInstr* fmi = mri_->foldMemoryOperand(mi, i, slot)) {
if (lv_)
lv_->instructionChanged(mi, fmi);
vrm.virtFolded(li.reg, mi, fmi);
mi2iMap_.erase(mi);
@ -244,8 +248,7 @@ std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
getUseIndex(index));
// create a new register for this spill
unsigned nReg =
mf_->getSSARegMap()->createVirtualRegister(rc);
unsigned nReg = mf_->getSSARegMap()->createVirtualRegister(rc);
mi->SetMachineOperandReg(i, nReg);
vrm.grow();
vrm.assignVirt2StackSlot(nReg, slot);
@ -258,10 +261,10 @@ std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
DEBUG(std::cerr << " +" << LR);
nI.addRange(LR);
added.push_back(&nI);
// update live variables
// update live variables if it is available
if (lv_)
lv_->addVirtualRegisterKilled(nReg, mi);
DEBUG(std::cerr << "\t\t\t\tadded new interval: "
<< nI << '\n');
DEBUG(std::cerr << "\t\t\t\tadded new interval: " << nI << '\n');
}
}
}