commit 70724aaf7329b8de8e53648b2a3afcbbf46ddbb7
author Jakob Stoklund Olesen <stoklund@2pi.dk> Tue May 15 22:20:27 2012 +0000
committer Jakob Stoklund Olesen <stoklund@2pi.dk> Tue May 15 22:20:27 2012 +0000
tree 5f55fa41cacbd9c11ba4809d1cfe9584d7517de1
parent 141aea9cff95b8df8ca89fb757dc44ee37a3d8df

Handle NewReg==OldReg in renameRegister().

This can happen when widening a virtual register to a super-register
class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156867 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveDebugVariables.cpp

diff --git a/lib/CodeGen/LiveDebugVariables.cpp b/lib/CodeGen/LiveDebugVariables.cpp
index 2187833..5b7941f 100644
--- a/lib/CodeGen/LiveDebugVariables.cpp
+++ b/lib/CodeGen/LiveDebugVariables.cpp
@@ -721,7 +721,8 @@
 
   if (TargetRegisterInfo::isVirtualRegister(NewReg))
     mapVirtReg(NewReg, UV);
-  virtRegToEqClass.erase(OldReg);
+  if (OldReg != NewReg)
+    virtRegToEqClass.erase(OldReg);
 
   do {
     UV->renameRegister(OldReg, NewReg, SubIdx, TRI);