From 4c6f2f9e92eae3e676ee09133e9666567782faa3 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 31 May 2006 18:03:39 +0000
Subject: [PATCH] commuteInstruction() does not always create a new MI!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28592 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/ScheduleDAG.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index d2820d96323..1d154017f51 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -402,8 +402,10 @@ void ScheduleDAG::EmitNode(SDNode *Node,
         DEBUG(std::cerr << "Sched: COMMUTING FAILED!\n");
       else {
         DEBUG(std::cerr << "Sched: COMMUTED TO: " << *NewMI);
-        delete MI;
-        MI = NewMI;
+        if (MI != NewMI) {
+          delete MI;
+          MI = NewMI;
+        }
       }
     }