v8/test/mjsunit/array-construct-transition.js

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// Flags: --allow-natives-syntax --smi-only-arrays

support_smi_only_arrays = %HasFastSmiOnlyElements(new Array(1,2,3,4,5,6,7,8));

if (support_smi_only_arrays) {
  var a = new Array(0, 1, 2);
  assertTrue(%HasFastSmiOnlyElements(a));
  var b = new Array(0.5, 1.2, 2.3);
  assertTrue(%HasFastDoubleElements(b));
  var c = new Array(0.5, 1.2, new Object());
  assertTrue(%HasFastElements(c));
}