From 673b347e5a4aa8ca382dfb38e0cc3e9ead6c68fe Mon Sep 17 00:00:00 2001
From: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Mon, 22 Aug 2016 14:50:12 +0000
Subject: [PATCH] Reset isUndef when removing subreg from a def operand

llvm-svn: 279437
---
 llvm/lib/CodeGen/MachineInstr.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index f860bac21696..12081a9fa90f 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -93,6 +93,8 @@ void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) {
     // Note that getSubReg() may return 0 if the sub-register doesn't exist.
     // That won't happen in legal code.
     setSubReg(0);
+    if (isDef())
+      setIsUndef(false);
   }
   setReg(Reg);
 }