Re: [Dev-C++] loop optimization

[David M. <ci...@ya...>]

Ok here is a test I tried on a OLD comp I have lying
around.

System specifications:
25Mhz 486 (no math co-processor)
4Mb Ram
Compiled using the Pacific C compiler (djgpp runs WAY too
slow) using full
optimization.

Program:
#include <stdio.h>
#include <time.h>

long getint(void);

int main()
{
  time_t begin,end;
  long i, get_int;

  begin = time(NULL);
  for(i = 0; i < getint(); ++i);
  end = time(NULL);
  printf("Function call time taken = %i\n", end - begin);

  get_int = getint();
  begin = time(NULL);
  for(i = 0; i < get_int; ++i);
  end = time(NULL);
  printf("Varible buffer time taken = %i\n", end - begin);

  return 0;
}

long getint(void)
{
  return 50000000;
}

Output:
Function call time taken = 40
Varible buffer time taken = 16

Hope this helps.

----- Original Message ----- 
From: "OROSZI Balázs" <or...@vp...>
To: <dev...@li...>
Sent: Tuesday, August 05, 2003 3:17 PM
Subject: Re: [Dev-C++] loop optimization


> Graham Douglas wrote:
> > Run the profiler to find out where the inefficiencies
are. In my
> > experience, any attempt to prejudge optimisation will
be wrong. The
> > inefficiencies are _never_ where you expect.
> >
> > The two fundamental rules for optimising by hand are:
> >
> > rule 1: don't do it.
> > rule 2: don't do it - yet.
>
> Thanks. Advice taken :)
>
> --
> Greetings,
>    Balázs
>
>
>
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