commit 385970f290e4f28b79cdf02b1fca5580ebfcea3f
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 9212d1accf5047af5b423293afb00e814ccba7b0
parent 1c6a2223d4df34bb19f65dd473bd91ed599c3b7e

Handle NewReg==OldReg in renameRegister().

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

llvm-svn: 156867

llvm/lib/CodeGen/LiveDebugVariables.cpp

diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index 2187833..5b7941f 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/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);