1 files changed, 47 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arguments/inline-arguments-new-spread-optimization.js b/js/src/jit-test/tests/arguments/inline-arguments-new-spread-optimization.js
new file mode 100644
index 0000000000..2dab581e68
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/inline-arguments-new-spread-optimization.js
@@ -0,0 +1,47 @@
+// |jit-test| --fast-warmup
+
+
+function foo(...args) {
+    with ({}) {}
+    return {result: args.length};
+}
+
+function inner() {
+    // Single argument spread calls with |arguments| can be optimised.
+    return new foo(...arguments);
+}
+
+function outer0() {
+    trialInline();
+    return inner();
+}
+
+function outer1() {
+    trialInline();
+    return inner(1);
+}
+
+function outer2() {
+    trialInline();
+    return inner(1, 2);
+}
+
+function outer3() {
+    trialInline();
+    return inner(1,2,3)
+}
+
+function outer4() {
+    trialInline();
+    return inner(1,2,3,4)
+}
+
+with ({}) {}
+
+for (var i = 0; i < 50; i++) {
+    assertEq(outer0().result, 0);
+    assertEq(outer1().result, 1);
+    assertEq(outer2().result, 2);
+    assertEq(outer3().result, 3);
+    assertEq(outer4().result, 4);
+}