Basic Example of loop unrolling

loop_unrolling.c

int normal_loop(int[] nums) {
    int x = 0;
    for (int i = 0; i < 250; i++) {
        x += nums[i];
    }
    return x;
}

int unrolled_loop(int[] nums) {
    int x = 0;
    for (int i = 0; i < 250; i+=5) {
        x += nums[i];
        x += nums[i+1];
        x += nums[i+2];
        x += nums[i+3];
        x += nums[i+4];
    }
    return x;
}