From 71c8dc9b20536e89afdae1b82075806761a57c89 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Fri, 9 Oct 2009 17:33:33 +0000
Subject: when previous scratch register is killed, flag the value as no longer
 tracking

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83653 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/PrologEpilogInserter.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'lib/CodeGen/PrologEpilogInserter.cpp')

diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index d9b01d0..8793df7 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -797,10 +797,13 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
             if (Reg == PrevScratchReg) {
               if (MO.isUse()) {
                 // Two-address operands implicitly kill
-                if (MO.isKill() || MI->isRegTiedToDefOperand(i))
+                if (MO.isKill() || MI->isRegTiedToDefOperand(i)) {
+                  havePrevValue = false;
                   PrevScratchReg = 0;
+                }
               } else {
                 assert (MO.isDef());
+                havePrevValue = false;
                 PrevScratchReg = 0;
               }
             }
-- 
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