Add an assert
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12010 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index 35c64e2..10c2158 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -277,7 +277,9 @@
// PHI nodes are guaranteed to be at the top of the block...
for (MachineBasicBlock::iterator MI = Succ->begin(), ME = Succ->end();
MI != ME && MI->getOpcode() == TargetInstrInfo::PHI; ++MI) {
- for (unsigned i = 1; ; i += 2)
+ for (unsigned i = 1; ; i += 2) {
+ assert(MI->getNumOperands() > i+1 &&
+ "Didn't find an entry for our predecessor??");
if (MI->getOperand(i+1).getMachineBasicBlock() == MBB) {
MachineOperand &MO = MI->getOperand(i);
if (!MO.getVRegValueOrNull()) {
@@ -288,6 +290,7 @@
break; // Found the PHI entry for this block...
}
}
+ }
}
}