v8/test/mjsunit/regress/regress-2596.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax

var ab = new ArrayBuffer(8);
var i_view = new Int32Array(ab);
i_view[0] = %GetHoleNaNUpper();
i_view[1] = %GetHoleNaNLower();
var doubles = new Float64Array(ab);  // kHoleNaN
assertTrue(isNaN(doubles[0]));

var prototype = [2.5, 2.5];
var array = [3.5, 3.5];
array.__proto__ = prototype;
assertTrue(%HasDoubleElements(array));

function boom(index) {
  array[index] = doubles[0];
  return array[index];
};
%PrepareFunctionForOptimization(boom);
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));

// Test hydrogen
%OptimizeFunctionOnNextCall(boom);
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));
assertTrue(isNaN(boom(0)));