1 files changed, 31 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/compiler/escape-analysis-rest-parameters.js b/deps/v8/test/mjsunit/compiler/escape-analysis-rest-parameters.js
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+++ b/deps/v8/test/mjsunit/compiler/escape-analysis-rest-parameters.js
@@ -0,0 +1,31 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+// Test variable index access to rest parameters
+// with up to 2 elements.
+(function testRestParametersVariableIndex() {
+  function g(...args) {
+    let s = 0;
+    for (let i = 0; i < args.length; ++i) s += args[i];
+    return s;
+  }
+
+  function f(x, y) {
+    // (a) args[i] is dead code since args.length is 0.
+    const a = g();
+    // (b) args[i] always yields the first element.
+    const b = g(x);
+    // (c) args[i] can yield either x or y.
+    const c = g(x, y);
+    return a + b + c;
+  }
+
+  assertEquals(4, f(1, 2));
+  assertEquals(5, f(2, 1));
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals(4, f(1, 2));
+  assertEquals(5, f(2, 1));
+})();