If the first definition of a virtual register is a partial redef, add an
<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
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 553b139..595fddd 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1388,11 +1388,21 @@
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