regress-4380.js 564 Bytes
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// Copyright 2015 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.

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// Flags: --allow-natives-syntax --opt
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function bar(a) {
  var x = a[0];
  return x == undefined;
}

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%PrepareFunctionForOptimization(bar);
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// Make the keyed load be polymorphic on holey smi and holey fast.
bar([, 2, 3]);
bar([, 'two', 'three']);
bar([, 2, 3]);

%OptimizeFunctionOnNextCall(bar);
bar([, 2, 3]);
// Verify that loading the hole doesn't cause deoptimization.
assertOptimized(bar);