From c3dd314b78c22007243c98f3f3521c7fdaa67c1b Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 2 Mar 2007 05:41:42 +0000
Subject: [PATCH] Invalidate last use of a reused register if the use is a
 deleted noop copy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34839 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/VirtRegMap.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 0f5c48aaa9b..7b8606c3209 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -937,6 +937,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
             DOUT << "Removing now-noop copy: " << MI;
             MBB.erase(&MI);
             VRM.RemoveFromFoldedVirtMap(&MI);
+            Spills.UpdateLastUse(Src, NULL);
             Spills.disallowClobberPhysReg(VirtReg);
             goto ProcessNextInst;
           }