Fix crash in machine verifier when trying to print the def of a register which has no def

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160531 91177308-0d34-0410-b5e6-96231b3b80d8

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