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Fix 403.gcc. Finally got the check for two-address-ness correct. 

llvm-svn: 53389
This commit is contained in:
Owen Anderson 2008-07-10 01:53:01 +00:00
parent 36b92ca037
commit 20f41dac8d
1 changed files with 14 additions and 10 deletions
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24
llvm/lib/CodeGen/RegAllocLocal.cpp
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@ -589,20 +589,24 @@ void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) {
std::map<unsigned, std::pair<MachineInstr*, unsigned> >::iterator
last = LastUseDef.find(MO.getReg());
if (last != LastUseDef.end()) {
// If this is a two address instr, then we don't mark the def
// as killing the use.
if (last->second.first == I &&
I->getDesc().getOperandConstraint(last->second.second,
TOI::TIED_TO) == (signed)i) {
LastUseDef[MO.getReg()] = std::make_pair(I, i);
continue;
// Check if this is a two address instruction. If so, then
// the def does not kill the use.
if (last->second.first == I) {
bool isTwoAddr = false;
for (unsigned j = i+1, je = I->getDesc().getNumOperands();
j < je; ++j) {
const MachineOperand &MO2 = I->getOperand(j);
if (MO2.isRegister() && MO2.isUse() &&
MO2.getReg() == MO.getReg() &&
I->getDesc().getOperandConstraint(j, TOI::TIED_TO) == (int)i)
isTwoAddr = true;
}
if (isTwoAddr) continue;
}
MachineOperand& lastUD =
last->second.first->getOperand(last->second.second);
if (lastUD.isDef())
lastUD.setIsDead(true);
else if (lastUD.isUse())