1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/dense-elem-write-barrier.js b/js/src/jit-test/tests/ion/dense-elem-write-barrier.js
new file mode 100644
index 0000000000..79fda227da
--- /dev/null
+++ b/js/src/jit-test/tests/ion/dense-elem-write-barrier.js
@@ -0,0 +1,22 @@
+var arr = [];
+for (var i=0; i<20; i++) {
+    arr.push(new Int32Array(2000));
+}
+arr.push([null, null]);
+
+function test(o, x) {
+    assertEq(o[0], x);
+}
+
+function f() {
+    for (var i=0; i<3100; i++) {
+	var o = arr[i % arr.length];
+	if (o.length > 10 || i > 2000) {
+	    var val = (i > 3000 ? 1 : null);
+	    o[0] = val;
+	    if (o.length < 5)
+		test(o, val);
+	}
+    }
+}
+f();