From ad068bc5fd5d19f5f48d69d3a39d8aacbbd26e85 Mon Sep 17 00:00:00 2001
From: Alon Zakai <alonzakai@gmail.com>
Date: Thu, 27 Feb 2014 10:47:14 -0800
Subject: emit assigns only for variables actually used

---
 lib/Target/JSBackend/JSBackend.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'lib')

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index 5074378efb..da28c26e4b 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -581,8 +581,9 @@ std::string JSWriter::getAssign(const Instruction *I) {
 }
 
 std::string JSWriter::getAssignIfNeeded(const Value *V) {
-  if (const Instruction *I = dyn_cast<Instruction>(V))
-    return getAssign(I);
+  if (const Instruction *I = dyn_cast<Instruction>(V)) {
+    if (I->getNumUses() > 0) return getAssign(I);
+  }
   return std::string();
 }
 
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