1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/bigint/bigint-dec.js b/js/src/jit-test/tests/bigint/bigint-dec.js
new file mode 100644
index 0000000000..09750c08bd
--- /dev/null
+++ b/js/src/jit-test/tests/bigint/bigint-dec.js
@@ -0,0 +1,51 @@
+const tests = [
+  [-0x10000000000000001n, -0x10000000000000002n],
+  [-0x10000000000000000n, -0x10000000000000001n],
+  [-0xffffffffffffffffn, -0x10000000000000000n],
+  [-0xfffffffffffffffen, -0xffffffffffffffffn],
+  [-0x8000000000000001n, -0x8000000000000002n],
+  [-0x8000000000000000n, -0x8000000000000001n],
+  [-0x7fffffffffffffffn, -0x8000000000000000n],
+  [-0x7ffffffffffffffen, -0x7fffffffffffffffn],
+  [-0x100000001n, -0x100000002n],
+  [-0x100000000n, -0x100000001n],
+  [-0xffffffffn, -0x100000000n],
+  [-0xfffffffen, -0xffffffffn],
+  [-0x80000001n, -0x80000002n],
+  [-0x80000000n, -0x80000001n],
+  [-0x7fffffffn, -0x80000000n],
+  [-0x7ffffffen, -0x7fffffffn],
+  [-2n, -3n],
+  [-1n, -2n],
+  [0n, -1n],
+  [1n, 0n],
+  [2n, 1n],
+  [0x7ffffffen, 0x7ffffffdn],
+  [0x7fffffffn, 0x7ffffffen],
+  [0x80000000n, 0x7fffffffn],
+  [0x80000001n, 0x80000000n],
+  [0xfffffffen, 0xfffffffdn],
+  [0xffffffffn, 0xfffffffen],
+  [0x100000000n, 0xffffffffn],
+  [0x100000001n, 0x100000000n],
+  [0x7ffffffffffffffen, 0x7ffffffffffffffdn],
+  [0x7fffffffffffffffn, 0x7ffffffffffffffen],
+  [0x8000000000000000n, 0x7fffffffffffffffn],
+  [0x8000000000000001n, 0x8000000000000000n],
+  [0xfffffffffffffffen, 0xfffffffffffffffdn],
+  [0xffffffffffffffffn, 0xfffffffffffffffen],
+  [0x10000000000000000n, 0xffffffffffffffffn],
+  [0x10000000000000001n, 0x10000000000000000n],
+];
+
+function f(tests) {
+  for (let test of tests) {
+    let input = test[0], expected = test[1];
+
+    assertEq(--input, expected);
+  }
+}
+
+for (let i = 0; i < 200; ++i) {
+  f(tests);
+}