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If the first definition of a virtual register is a partial redef, add an

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<imp-def> operand for the full register. This ensures that the full physical
register is marked live after register allocation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104320 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-05-21 16:32:16 +00:00
parent d8a33ddcfe
commit 63e6a488cb
3 changed files with 24 additions and 7 deletions
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20
lib/CodeGen/MachineInstr.cpp
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@ -1388,11 +1388,21 @@ bool MachineInstr::addRegisterDead(unsigned IncomingReg,
void MachineInstr::addRegisterDefined(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo) {
MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
if (!MO || MO->getSubReg())
addOperand(MachineOperand::CreateReg(IncomingReg,
true /*IsDef*/,
true /*IsImp*/));
if (TargetRegisterInfo::isPhysicalRegister(IncomingReg)) {
MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
if (MO)
return;
} else {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.getReg() == IncomingReg && MO.isDef() &&
MO.getSubReg() == 0)
return;
}
}
addOperand(MachineOperand::CreateReg(IncomingReg,
true /*IsDef*/,
true /*IsImp*/));
}
unsigned