Fix PR294

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12425 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/RegAllocSimple.cpp b/lib/CodeGen/RegAllocSimple.cpp
index cd48cd2af54a4dac9215e4f7cb743b5fbde73989..1b7f5471b423e415471dd23167e31fe494f50623 100644 (file)
--- a/lib/CodeGen/RegAllocSimple.cpp
+++ b/lib/CodeGen/RegAllocSimple.cpp
@@ -172,7 +172,8 @@ void RegAllocSimple::AllocateBasicBlock(MachineBasicBlock &MBB) {
     for (int i = MI->getNumOperands() - 1; i >= 0; --i) {
       MachineOperand &op = MI->getOperand(i);
       
-      if (op.isRegister() && MRegisterInfo::isVirtualRegister(op.getReg())) {
+      if (op.isRegister() && op.getReg() &&
+          MRegisterInfo::isVirtualRegister(op.getReg())) {
         unsigned virtualReg = (unsigned) op.getReg();
         DEBUG(std::cerr << "op: " << op << "\n");
         DEBUG(std::cerr << "\t inst[" << i << "]: ";