v8/test/mjsunit/compiler/deopt-soft-simple.js

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// Copyright 2017 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
function change_o() {
o = { y : 0, x : 1 };
}
var o = { x : 1 };
function f() {
// It triggers a soft deoptimization.
change_o();
return o.x;
}
%OptimizeFunctionOnNextCall(f);
f();