bug1983499.js - mozsearch

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function test() {

  var i8 = new Int8Array(4);

  var i16 = new Int16Array(i8.buffer, 0, 2);

  for (var i = 0; i < 100; ++i) {

    i8.set([

      0x11,

      0x22,

      0x33,

      0x44,

]);

    var oldval = 0x22_11;

    // Ensure initial state is correct. (Little endian order!)

    assertEq(i16[0], oldval);

    assertEq(i16[1], 0x44_33);

    // 0x88_99_55_66 will get truncated to 0x55_66.

    var newval = 0x88_99_55_66;

    oldval = Atomics.compareExchange(i16, 0, 0x22_11, newval);

    // Assert success.

    assertEq(oldval, 0x22_11);

    // Ensure high bits 0x33_44 weren't overwritten with 0x88_99.

    assertEq(i8[0], 0x66);

    assertEq(i8[1], 0x55);

    assertEq(i8[2], 0x33);

    assertEq(i8[3], 0x44);

test();