optimize fround polyfill a tiny bit

1 files changed, 4 insertions, 2 deletions

diff --git a/src/preamble.js b/src/preamble.js
index 3238c99c..3e76e503 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -1076,8 +1076,10 @@ Math.imul = Math['imul'];
 
 #if PRECISE_F32
 #if PRECISE_F32 == 1
-var froundBuffer = new Float32Array(1);
-if (!Math['fround']) Math['fround'] = function(x) { froundBuffer[0] = x; return froundBuffer[0] };
+if (!Math['fround']) {
+  var froundBuffer = new Float32Array(1);
+  Math['fround'] = function(x) { froundBuffer[0] = x; return froundBuffer[0] };
+}
 #else // 2
 if (!Math['fround']) Math['fround'] = function(x) { return x };
 #endif