src/v8/test/mjsunit/typed-array-slice.js

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// Flags: --allow-natives-syntax

// This is a regression test for overlapping key and value registers.

var types = [Array, Int8Array, Uint8Array, Int16Array, Uint16Array,
             Int32Array, Uint32Array, Uint8ClampedArray, Float32Array,
             Float64Array];

var results1 = [-2, -2, 254, -2, 65534, -2, 4294967294, 0, -2, -2];
var results2 = [undefined, -1, 255, -1, 65535, -1, 4294967295, 0, -1, -1];
var results3 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
var results4 = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1];

const kElementCount = 40;

function do_slice(a) {
  return Array.prototype.slice.call(a, 4, 8);
}

for (var t = 0; t < types.length; t++) {
  var type = types[t];
  var a = new type(kElementCount);
  for (var i = 0; i < kElementCount; ++i ) {
    a[i] = i-6;
  }
  delete a[5];
  var sliced = do_slice(a);

  %ClearFunctionFeedback(do_slice);
  assertEquals(results1[t], sliced[0]);
  assertEquals(results2[t], sliced[1]);
  assertEquals(results3[t], sliced[2]);
  assertEquals(results4[t], sliced[3]);
}