Handle NewReg==OldReg in renameRegister().

[oota-llvm.git] / lib / CodeGen / LiveDebugVariables.cpp

diff --git a/lib/CodeGen/LiveDebugVariables.cpp b/lib/CodeGen/LiveDebugVariables.cpp
index 2187833031eefb26b9a56b54ff977cfb83407359..5b7941f4612025b15fb984ba637346f798d4484b 100644 (file)
--- a/lib/CodeGen/LiveDebugVariables.cpp
+++ b/lib/CodeGen/LiveDebugVariables.cpp
@@ -721,7 +721,8 @@ renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx) {
 
   if (TargetRegisterInfo::isVirtualRegister(NewReg))
     mapVirtReg(NewReg, UV);
-  virtRegToEqClass.erase(OldReg);
+  if (OldReg != NewReg)
+    virtRegToEqClass.erase(OldReg);
 
   do {
     UV->renameRegister(OldReg, NewReg, SubIdx, TRI);