toolkit/xre/test/test_fpuhandler.html


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<head>
  <title>Floating-point exception handler test</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>

<body onload="runTest()">
  <embed id="plugin1" type="application/x-test" width="400" height="400"></embed>

  <script class="testbody" type="application/javascript">
  SimpleTest.waitForExplicitFinish();

  function doDiv(x, y) {
    var z;
    z = x / y;

    for (let i = 0 + x; i < 1000; ++i)
      z = y / x;

    z = x / y;
    return z;
  }

  function runTest() {
    ok(isNaN(doDiv(0.0, 0.0)), "Undefined division-by-zero doesn't crash");

    try {
      document.getElementById("plugin1").enableFPExceptions();
    } catch (e) {
      ok(true, "No special code to set the FPU bit in the testplugin.");
      SimpleTest.finish();
      return;
    }

    ok(isNaN(doDiv(0.0, 0.0)), "Undefined division-by-zero doesn't crash again.");
    SimpleTest.finish();
  }
  </script>