1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/eliminate-type-barrier.js b/js/src/jit-test/tests/ion/eliminate-type-barrier.js
new file mode 100644
index 0000000000..75cc9a200a
--- /dev/null
+++ b/js/src/jit-test/tests/ion/eliminate-type-barrier.js
@@ -0,0 +1,41 @@
+function foo(a) {
+  var y = 0;
+  for (var i = 0; i < 10; i++) {
+    var x = a[i];
+    z = x.f;
+    if (x.h != null)
+      y = x.f.g;
+  }
+  return y;
+}
+
+function foo2(a) {
+  var y = 0;
+  for (var i = 0; i < 10; i++) {
+    var x = a[i];
+    if (x.f !== undefined) {
+      if (x.h != null)
+        y = x.f.g;
+    }
+  }
+  return y;
+}
+
+a = [];
+for (var i = 0; i < 10; i++)
+  a[i] = {f:null, h:null};
+for (var i = 0; i < 10; i++) {
+  a[i].f = {g:0};
+  a[i].h = {};
+}
+var q = a[0].h;
+a[0].f = null;
+a[0].h = null;
+
+foo(a);
+foo2(a);
+
+a[0].h = q;
+
+try { foo(a); } catch (e) {}
+try { foo2(a); } catch (e) {}