From: Pete Cooper <peter_cooper@apple.com>
Date: Thu, 19 Jul 2012 23:40:38 +0000 (+0000)
Subject: Fix crash in machine verifier when trying to print the def of a register which has... 
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=b97c57a8b7dc268958924b8bcc0e97f70437dff6;p=oota-llvm.git

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
---

diff --git a/lib/CodeGen/MachineVerifier.cpp b/lib/CodeGen/MachineVerifier.cpp
index fca051effaf..d8dece66d88 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