From 24d79ba2ef120ed9708ac10fc9fa146334df00c7 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Tue, 5 Aug 2008 22:24:40 +0000
Subject: [PATCH] Fix breakage on ARM/2008-04-10-ScavengerAssert.ll.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54378 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/UnreachableBlockElim.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/UnreachableBlockElim.cpp b/lib/CodeGen/UnreachableBlockElim.cpp
index ca682fd65a0..f1e3aabaebe 100644
--- a/lib/CodeGen/UnreachableBlockElim.cpp
+++ b/lib/CodeGen/UnreachableBlockElim.cpp
@@ -137,7 +137,8 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
             start++;
             phi->eraseFromParent();
             
-            F.getRegInfo().replaceRegWith(Output, Input);
+            if (Input != Output)
+              F.getRegInfo().replaceRegWith(Output, Input);
           } else
             start++;
         }