From 33e694a8077809dc414145d65a31f73068c85589 Mon Sep 17 00:00:00 2001
From: Dan Gohman <dan433584@gmail.com>
Date: Thu, 12 May 2016 04:19:09 +0000
Subject: [WebAssembly] Fast-isel support for calls, arguments, and selects.

llvm-svn: 269273
---
 llvm/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'llvm/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp')

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp
index b3da7861f29..1e9a773ae62 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyStoreResults.cpp
@@ -115,9 +115,11 @@ static bool ReplaceDominatedUses(MachineBasicBlock &MBB, MachineInstr &MI,
     O.setReg(ToReg);
 
     // If the store's def was previously dead, it is no longer.
-    MI.getOperand(0).setIsDead(false);
+    if (!O.isUndef()) {
+      MI.getOperand(0).setIsDead(false);
 
-    Indices.push_back(WhereIdx.getRegSlot());
+      Indices.push_back(WhereIdx.getRegSlot());
+    }
   }
 
   if (Changed) {
-- 
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