diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug915301.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug915301.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+setJitCompilerOption("ion.usecount.trigger", 50);
+var f32 = new Float32Array(32);
+f32[0] = 0;
+
+function g(x) {
+    eval(""); // don't inline
+    return x + 4;
+}
+
+function f(n) {
+    var x;
+    if (n > 10000) {
+        x = 4.5;
+    } else {
+        x = f32[0];
+    }
+    f32[0] = g(x);
+}
+
+for (var n = 0; n < 100; n++)
+    f(n);
+
+assertEq(f32[0], 400);