Don't access MO reference after invalidating operand list.
This should unbreak llvm-x86_64-linux.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156778 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp
index 15485b1..b383222 100644
--- a/lib/CodeGen/RegAllocFast.cpp
+++ b/lib/CodeGen/RegAllocFast.cpp
@@ -659,9 +659,10 @@
// Return true if the operand kills its register.
bool RAFast::setPhysReg(MachineInstr *MI, unsigned OpNum, unsigned PhysReg) {
MachineOperand &MO = MI->getOperand(OpNum);
+ bool Dead = MO.isDead();
if (!MO.getSubReg()) {
MO.setReg(PhysReg);
- return MO.isKill() || MO.isDead();
+ return MO.isKill() || Dead;
}
// Handle subregister index.
@@ -680,7 +681,7 @@
if (MO.isDef() && MO.isUndef())
MI->addRegisterDefined(PhysReg, TRI);
- return MO.isDead();
+ return Dead;
}
// Handle special instruction operand like early clobbers and tied ops when