From 385970f290e4f28b79cdf02b1fca5580ebfcea3f Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 15 May 2012 22:20:27 +0000
Subject: 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 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/LiveDebugVariables.cpp')

diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index 2187833031e..5b7941f4612 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/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);
-- 
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