test/mjsunit/external-array.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax

// This is a regression test for overlapping key and value registers.
function f(a) {
  a[0] = 0;
  a[1] = 0;
}

var a = new Int32Array(2);
for (var i = 0; i < 5; i++) {
  f(a);
}
%OptimizeFunctionOnNextCall(f);
f(a);

assertEquals(0, a[0]);
assertEquals(0, a[1]);

// Test the correct behavior of the |length| property (which is read-only).
a = new Int32Array(42);
assertEquals(42, a.length);
a.length = 2;
assertEquals(42, a.length);
assertTrue(delete a.length);
a.length = 2
assertEquals(2, a.length);

// Test the correct behavior of the |BYTES_PER_ELEMENT| property (which is
// "constant", but not read-only).
a = new Int32Array(2);
assertEquals(4, a.BYTES_PER_ELEMENT);
a.BYTES_PER_ELEMENT = 42;
assertEquals(42, a.BYTES_PER_ELEMENT);
a = new Uint8Array(2);
assertEquals(1, a.BYTES_PER_ELEMENT);
a = new Int16Array(2);
assertEquals(2, a.BYTES_PER_ELEMENT);