From b97c57a8b7dc268958924b8bcc0e97f70437dff6 Mon Sep 17 00:00:00 2001 From: Pete Cooper Date: Thu, 19 Jul 2012 23:40:38 +0000 Subject: [PATCH] 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 --- lib/CodeGen/MachineVerifier.cpp | 2 ++ 1 file changed, 2 insertions(+) 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