diff options
Diffstat (limited to 'lib/CodeGen/LiveVariables.cpp')
| -rw-r--r-- | lib/CodeGen/LiveVariables.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index acf986ca61..348ed3a0f9 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -573,7 +573,8 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) { unsigned MOReg = MO.getReg(); if (MO.isUse()) { MO.setIsKill(false); - UseRegs.push_back(MOReg); + if (MO.readsReg()) + UseRegs.push_back(MOReg); } else /*MO.isDef()*/ { MO.setIsDead(false); DefRegs.push_back(MOReg); @@ -729,8 +730,9 @@ void LiveVariables::analyzePHINodes(const MachineFunction& Fn) { for (MachineBasicBlock::const_iterator BBI = I->begin(), BBE = I->end(); BBI != BBE && BBI->isPHI(); ++BBI) for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2) - PHIVarInfo[BBI->getOperand(i + 1).getMBB()->getNumber()] - .push_back(BBI->getOperand(i).getReg()); + if (BBI->getOperand(i).readsReg()) + PHIVarInfo[BBI->getOperand(i + 1).getMBB()->getNumber()] + .push_back(BBI->getOperand(i).getReg()); } bool LiveVariables::VarInfo::isLiveIn(const MachineBasicBlock &MBB, |