diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/asm.js/testParallelCompile.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/asm.js/testParallelCompile.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+load(libdir + "asm.js");
+
+if (!isAsmJSCompilationAvailable())
+    quit();
+
+var module = "'use asm';\n";
+for (var i = 0; i < 100; i++) {
+    module += "function f" + i + "(i) {\n";
+    module += "  i=i|0; var j=0; j=(i+1)|0; i=(j-4)|0; i=(i+j)|0; return i|0\n";
+    module += "}\n";
+}
+module += "return f0";
+var script = "(function() {\n" + module + "})";
+
+for (var i = 0; i < 10; i++) {
+    try {
+        offThreadCompileScript(script);
+        var f = new Function(module);
+        var g = runOffThreadScript();
+        assertEq(isAsmJSModule(f), true);
+        assertEq(isAsmJSModule(g), true);
+    } catch (e) {
+        // ignore spurious error when offThreadCompileScript can't run in
+        // parallel
+    }
+}