1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/dense-elements-hole-negative.js b/js/src/jit-test/tests/basic/dense-elements-hole-negative.js
new file mode 100644
index 000000000..cf63da92e
--- /dev/null
+++ b/js/src/jit-test/tests/basic/dense-elements-hole-negative.js
@@ -0,0 +1,31 @@
+// The index is negative before code generation.
+
+let v = {};
+let negativeIndex = -1;
+
+function f(obj) {
+  assertEq(obj[negativeIndex] === v, true);
+}
+for (let i = 0; i < 2000; i++) {
+  let obj = {};
+  obj[1] = {};
+  obj[negativeIndex] = v;
+  f(obj);
+}
+
+// The sign of the index changes after the code generation.
+
+function g(obj, i) {
+  for (let j = 0; j < 4; j++) {
+    assertEq(obj[i-j] === v, true);
+  }
+}
+for (let i = 0; i < 2000; i++) {
+  let obj = {};
+  obj[1] = {};
+  let X = 2000 - i;
+  for (let j = 0; j < 10; j++) {
+    obj[X-j] = v;
+  }
+  g(obj, X);
+}