Watch out for PHI instruction with no source operands.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90488 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index ba9be6a..2cafbd4 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1064,6 +1064,8 @@
unsigned MachineInstr::isConstantValuePHI() const {
if (getOpcode() != TargetInstrInfo::PHI)
return 0;
+ if (getNumOperands() <= 1)
+ return 0;
unsigned Reg = getOperand(1).getReg();
for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)