v8/test/mjsunit/compiler/is-being-interpreted-1.js

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// Copyright 2019 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 --opt --no-always-opt
function bar() { return foo(); }
function foo() { return %IsBeingInterpreted(); }
%PrepareFunctionForOptimization(bar);
%PrepareFunctionForOptimization(foo);
assertTrue(bar());
assertTrue(bar());
%OptimizeFunctionForTopTier(bar);
assertFalse(bar());