v8/test/mjsunit/regress/regress-2451.js

// Copyright 2013 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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// Flags: --allow-natives-syntax --opt

function f() {
  assertEquals(-1.0, Math.round(-1.5));
  assertEquals(-2.0, Math.round(-2.5));
  assertEquals(-1.0, Math.round(-0.5000000000000001));
}

%PrepareFunctionForOptimization(f);
f();
f();
%OptimizeFunctionOnNextCall(f);
f();
assertOptimized(f);