diff options
| -rw-r--r-- | lib/CodeGen/MachineVerifier.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineVerifier.cpp b/lib/CodeGen/MachineVerifier.cpp index fca051effa..d8dece66d8 100644 --- a/lib/CodeGen/MachineVerifier.cpp +++ b/lib/CodeGen/MachineVerifier.cpp @@ -837,6 +837,8 @@ void MachineVerifier::checkLiveness(const MachineOperand *MO, unsigned MONum) { // Reserved registers may be used even when 'dead'. if (!isReserved(Reg)) report("Using an undefined physical register", MO, MONum); + } else if (MRI->def_empty(Reg)) { + report("Reading virtual register without a def", MO, MONum); } else { BBInfo &MInfo = MBBInfoMap[MI->getParent()]; // We don't know which virtual registers are live in, so only complain |