request: add loop benchmark
sometime we don't need complicated algorithm to see performance of programming
language, we just need to see how these language loop's implemetation, all benchmark
game like binarytree, fasta, etc just only test loop implementation of language and sometime
benchmark implementation syscall like 'print' to console through loop

example just loop for 1000_000_000 (billion) in linux bash for various language,
i'm using digitalocean cloud with centos7 

    perl 5.16 -> 5 secs just loop
    
    # time perl -e 'my $a = 1; for $i (0 .. 1000000000){$a+=4}; print $a'
    4000000005
    real    0m5.020s
    user    0m5.006s
    sys     0m0.009s
    


-

    ---  php 5.4.16 -> 3.5 secs just loop
    
    # time php -r '$a = 1; for($i=0;$i<=1000000000;$i++){ $a+=4; } echo $a;'
    4000000005
    real    0m3.536s
    user    0m3.502s
    sys     0m0.032s

    --- php 8.2.8 -> 1.2 secs just loop

    # time php82 -r '$a = 1; for($i=0;$i<=1000000000;$i++){ $a+=4; } echo $a;'
    4000000005
    real    0m1.181s
    user    0m1.152s
    sys     0m0.029s

-

    python

    --- src

    # cat loop.py
    a = 1
    for i in range(0,1000000001):
        a += 4

    print(a)

    --- python2 -> error just loop

    # time python loop.py
    Traceback (most recent call last):
      File "loop.py", line 2, in <module>
        for i in range(0,1000000000):
    MemoryError

    --- python3 -> 30 secs just loop

    # time python3 loop.py
    4000000005
    real    0m30.887s
    user    0m30.857s
    sys     0m0.015s

-

    C gcc 11.2.1

    --- src

    # cat loop.c

    #include <stdio.h>
    void main(){
            long i,a=1;
            for(i=0;i<=1000000000;i++){
                    a += 4 ;
            }
        printf("%lli",a);
    }

    --- default optimation -> 0.5 secs just loop

    # gcc -o loop loop.c
    # time loop
    4000000005
    real    0m0.526s
    user    0m0.523s
    sys     0m0.003s


    --- O3 optimation -> 0.002 secs just loop
        
    # gcc -O3 -o loop loop.c
    # time loop
    4000000005
    real    0m0.003s
    user    0m0.001s
    sys     0m0.002s
    

note: 
we need simple operation on loop like a+=4 so the optimizer of language 'dont cheat' the output, because empty operation might make some language optimizer skip loop operation 

