From d95d100c285f7a0eb54845b1c4eedcde8aa95705 Mon Sep 17 00:00:00 2001
From: Krzysztof Parzyszek <kparzysz@codeaurora.org>
Date: Fri, 19 Aug 2016 22:57:23 +0000
Subject: [PATCH] Reset "undef" flag when coalescing subregister into whole
 register

llvm-svn: 279344
---
 llvm/lib/CodeGen/RegisterCoalescer.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp
index 2d9a61b..bf7aacc 100644
--- a/llvm/lib/CodeGen/RegisterCoalescer.cpp
+++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp
@@ -975,6 +975,7 @@ bool RegisterCoalescer::reMaterializeTrivialDef(const CoalescerPair &CP,
         NewRC = CommonRC;
         DstIdx = 0;
         DefMO.setSubReg(0);
+        DefMO.setIsUndef(false); // Only subregs can have def+undef.
       }
     }
   }
-- 
2.7.4