1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/bug1757634.js b/js/src/jit-test/tests/cacheir/bug1757634.js
new file mode 100644
index 0000000000..97ea3a87f4
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/bug1757634.js
@@ -0,0 +1,29 @@
+function testSmallIndex() {
+   var proto = Object.create(null);
+   var arr = [];
+   Object.setPrototypeOf(arr, proto);
+
+   proto[0] = 123;
+   Object.freeze(proto);
+
+   for (var i = 0; i < 20; i++) {
+      arr[0] = 321;
+   }
+   assertEq(arr[0], 123);
+}
+testSmallIndex();
+
+function testLargeIndex() {
+   var proto = Object.create(null);
+   var arr = [];
+   Object.setPrototypeOf(arr, proto);
+
+   proto[98765432] = 123;
+   Object.freeze(proto);
+
+   for (var i = 0; i < 20; i++) {
+      arr[98765432] = 321;
+   }
+   assertEq(arr[98765432], 123);
+}
+testLargeIndex();