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Avoid adding a duplicate def. This fixes PR4478.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74857 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-07-06 21:34:05 +00:00
parent 643dda1d62
commit 2c4d96dfe9
2 changed files with 148 additions and 2 deletions
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lib/CodeGen/LiveVariables.cpp
+11 -2
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@@ -369,8 +369,17 @@ bool LiveVariables::HandlePhysRegKill(unsigned Reg, MachineInstr *MI) {
for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
unsigned SubReg = *SubRegs; ++SubRegs) {
if (PartUses.count(SubReg)) {
PhysRegDef[Reg]->addOperand(MachineOperand::CreateReg(SubReg,
true, true));
bool NeedDef = true;
if (PhysRegDef[Reg] == PhysRegDef[SubReg]) {
MachineOperand *MO = PhysRegDef[Reg]->findRegisterDefOperand(SubReg);
if (MO) {
NeedDef = false;
assert(!MO->isDead());
}
}
if (NeedDef)
PhysRegDef[Reg]->addOperand(MachineOperand::CreateReg(SubReg,
true, true));
LastRefOrPartRef->addRegisterKilled(SubReg, TRI, true);
for (const unsigned *SS = TRI->getSubRegisters(SubReg); *SS; ++SS)
PartUses.erase(*SS);