v8/test/mjsunit/regress/compare-map-elim1.js

// Copyright 2010 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// Flags: --allow-natives-syntax --check-elimination


function foo(o) {
  return o.foo1;
};
%PrepareFunctionForOptimization(foo);
function getter() {
  return this.x + this.z + foo2(this);
}

function foo2(o) {
  return o.a;
}

var o1 = {z: 0, x: 1};
var o2 = {z: 0, a: 1.5, x: 1};
var o3 = {z: 0, a: 1.5};
Object.defineProperty(o1, 'foo1', {get: getter});
Object.defineProperty(o2, 'foo1', {get: getter});

foo(o1);
foo(o1);
foo(o2);
%ClearFunctionFeedback(foo2);
foo2(o2);
foo2(o2);
foo2(o3);
%OptimizeFunctionOnNextCall(foo);
foo(o1);