gistfile1.js

if (window.SIMD) {
  // yay, SIMD available, let's do a little stereo mixdown routine
  for (var i = 0; i < bufsize; i+=4) {
    var lhs = SIMD.float32x4(left[i+0], left[i+1],
                             left[i+2], left[i+3]),
        rhs = SIMD.float32x4(right[i+0], right[i+1],
                             right[i+2], right[i+3]),
        mixdown = SIMD.float32x4();

    mixdown = lhs.add(rhs);
    SIMD.float32x4.store(center, i, mixdown)
  }
}