Function pi_host

examples/benchmarks/pi.cpp:35–43

}

static double pi_host() {
    int count = 0;
    for (int i = 0; i < samples; ++i) {
        float x = float(rand()) / float(RAND_MAX);
        float y = float(rand()) / float(RAND_MAX);
        if (sqrt(x * x + y * y) < 1) count++;
    }
    return 4.0 * count / samples;
}

// void wrappers for timeit()
static void device_wrapper() { pi_device(); }