static void Dot3SoaScalar(float[] xs, float[] ys, float[] zs, float[] dp) {
    for (var j = 0; j < reps; ++j) {
        for (var i = 0; i < dp.Length; ++i) {
            dp[i] = xs[i] * xs[i] + ys[i] * ys[i] + zs[i] * zs[i];
        }
    }
}