1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/conditional-test-undefined-1.js b/js/src/jit-test/tests/warp/conditional-test-undefined-1.js
new file mode 100644
index 0000000000..382f3ca966
--- /dev/null
+++ b/js/src/jit-test/tests/warp/conditional-test-undefined-1.js
@@ -0,0 +1,22 @@
+function g(array) {
+  // 1. Absent properties return |undefined| from CacheIR.
+  // 2. Tests on |undefined| are changed to |false| in CacheIR.
+  //
+  // When Warp compiling the CacheIR ops, the first test will then happen on
+  // a boolean, whereas the phi still sees the original undefined value.
+  if (array.does_not_exist || array.slice) {
+    return 1;
+  }
+  return 0;
+}
+
+function f() {
+  var array = [];
+  var r = 0;
+  for (let i = 0; i < 100; ++i) {
+    r += g(array);
+  }
+  assertEq(r, 100);
+}
+
+for (let i = 0; i < 2; ++i) f();
+\ No newline at end of file