1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/bigint/bug1580020.js b/js/src/jit-test/tests/bigint/bug1580020.js
new file mode 100644
index 0000000000..52ef27dd5f
--- /dev/null
+++ b/js/src/jit-test/tests/bigint/bug1580020.js
@@ -0,0 +1,14 @@
+// This test was designed for asan.
+//
+// In the deferred mode of parsing we need to ensure that the
+// asmJS parser doesn't emit the deferred big int under the
+// asmJS lifo alloc.
+var x = -1n;
+function a() {
+  'use asm';
+  function f() {
+    return (((((-1) >>> (0 + 0)) | 0) % 10000) >> (0 + 0)) | 0;
+  }
+  return f;
+}
+assertEq(true, a()() == x);
+\ No newline at end of file