From 79cb53ce9563fff74605454560e98ea0aa4b523f Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Mon, 1 Nov 2010 21:51:29 +0000
Subject: [PATCH] Update kill flags while rewriting instructions after
 splitting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117959 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SplitKit.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index 5b5b602952e..f8be7d484fe 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -822,6 +822,7 @@ void SplitEditor::rewrite(unsigned reg) {
   for (MachineRegisterInfo::reg_iterator RI = mri_.reg_begin(reg),
        RE = mri_.reg_end(); RI != RE;) {
     MachineOperand &MO = RI.getOperand();
+    unsigned OpNum = RI.getOperandNo();
     MachineInstr *MI = MO.getParent();
     ++RI;
     if (MI->isDebugValue()) {
@@ -844,6 +845,8 @@ void SplitEditor::rewrite(unsigned reg) {
     DEBUG(dbgs() << "  rewr BB#" << MI->getParent()->getNumber() << '\t'<< Idx);
     assert(LI && "No register was live at use");
     MO.setReg(LI->reg);
+    if (MO.isUse() && !MI->isRegTiedToDefOperand(OpNum))
+      MO.setIsKill(LI->killedAt(Idx.getDefIndex()));
     DEBUG(dbgs() << '\t' << *MI);
   }
 }