From c6f3be7a4da7ba2f94dcbd3b442147807b558b99 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Tue, 4 Mar 2014 21:30:15 -0800
Subject: Don't run calculateNativizedVars at -O1 and higher.

---
 lib/Target/JSBackend/JSBackend.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index 56e125c3f3..92d562a1df 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -1849,7 +1849,11 @@ void JSWriter::printFunction(const Function *F) {
 
   UsedVars.clear();
   UniqueNum = 0;
-  calculateNativizedVars(F);
+
+  // When optimizing, the regular optimizer (mem2reg, SROA, GVN, and others)
+  // will have already taken all the opportunities for nativization.
+  if (OptLevel == CodeGenOpt::None)
+    calculateNativizedVars(F);
 
   // Do alloca coloring at -O1 and higher.
   Allocas.analyze(*F, *DL, OptLevel != CodeGenOpt::None);
-- 
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