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Process all uses first before defs to accurately capture register liveness. rdar://10449480 

llvm-svn: 144770
This commit is contained in:
Evan Cheng 2011-11-16 03:05:12 +00:00
parent e6270395e3
commit 9ddd69a8bc
1 changed files with 13 additions and 7 deletions
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20
llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -1115,6 +1115,7 @@ TwoAddressInstructionPass::RescheduleKillAboveMI(MachineBasicBlock *MBB,
MCID.isTerminator())
// Don't move pass calls, etc.
return false;
SmallVector<unsigned, 2> OtherDefs;
for (unsigned i = 0, e = OtherMI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = OtherMI->getOperand(i);
if (!MO.isReg())
@ -1131,15 +1132,20 @@ TwoAddressInstructionPass::RescheduleKillAboveMI(MachineBasicBlock *MBB,
// Don't want to extend other live ranges and update kills.
return false;
} else {
if (Uses.count(MOReg))
return false;
if (TargetRegisterInfo::isPhysicalRegister(MOReg) &&
LiveDefs.count(MOReg))
return false;
// Physical register def is seen.
Defs.erase(MOReg);
OtherDefs.push_back(MOReg);
}
}
for (unsigned i = 0, e = OtherDefs.size(); i != e; ++i) {
unsigned MOReg = OtherDefs[i];
if (Uses.count(MOReg))
return false;
if (TargetRegisterInfo::isPhysicalRegister(MOReg) &&
LiveDefs.count(MOReg))
return false;
// Physical register def is seen.
Defs.erase(MOReg);
}
}
// Move the old kill above MI, don't forget to move debug info as well.