diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug940846.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug940846.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+function a(f, i) {
+    results = []
+    for (var k = 0; k < 10; ++k) {
+        gc();
+        try {
+            results.push(f(i[k]));
+        } catch (e) {
+            results.push(e);
+        }
+    }
+}
+g = (function(x, y) {
+    return Math.fround((x ? Math.f : m0) ? w : Math.fround())
+})
+a(g, [Number.MAX_VALUE])