Add an assertion, update DefInst even though no one uses it (dangling pointers

don't help anyone)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25081 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 26498b7ec1..f27ae2a821 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -393,6 +393,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM) {
       
       // Otherwise, reload it and remember that we have it.
       PhysReg = VRM.getPhys(VirtReg);
+      assert(PhysReg && "Must map virtreg to physreg!");
       const TargetRegisterClass* RC =
         MBB.getParent()->getSSARegMap()->getRegClass(VirtReg);