1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/array-slice.js b/js/src/jit-test/tests/cacheir/array-slice.js
new file mode 100644
index 0000000000..2ed43926ff
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/array-slice.js
@@ -0,0 +1,39 @@
+function packed() {
+  var a = [0, 1, 2, 3];
+  for (var i = 0; i <= 100; ++i) {
+    var r = a.slice(0);
+    assertEq(r.length, 4);
+  }
+}
+
+for (var i = 0; i < 2; ++i) {
+  packed();
+}
+
+function packedThenUnpacked() {
+  var a = [0, 1, 2, 3];
+  var q = 0;
+  for (var i = 0; i <= 100; ++i) {
+    if (i === 100) a[10] = 0;
+
+    var r = a.slice(0);
+    assertEq(r.length, i < 100 ? 4 : 11);
+  }
+}
+
+for (var i = 0; i < 2; ++i) {
+  packedThenUnpacked();
+}
+
+function unpacked() {
+  var a = [0, 1, /* hole */ , 3];
+  for (var i = 0; i <= 100; ++i) {
+    var r = a.slice(0);
+    assertEq(r.length, 4);
+    assertEq(2 in r, false);
+  }
+}
+
+for (var i = 0; i < 2; ++i) {
+  unpacked();
+}