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Subject: Re: optimizing loops question

Author: Dave Gomboc

Date: 18:12:41 07/21/03

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On July 21, 2003 at 21:11:09, Dave Gomboc wrote:

>On July 20, 2003 at 08:01:50, Uri Blass wrote:
>
>>I also thought about the following code but
>>I do not like if commands and I understood it is better
>>to have branchless code.
>>
>>do
>>{
>>  f(i);
>>  if (i==n)
>>   break;
>>  i++;
>>}
>>while (1);
>
>There must be a branch somewhere; whether it is implicit in a for-loop or
>explicit with break is not terribly important.  There's nothing wrong with this
>chunk of code, and if you would otherwise have to duplicate the real code that
>you use f(i) to represent, then it's your best option for code clarity.
>
>I would write it as
>
>    do {
>        // here is the code that you are doing
>        // over and over throughout the loop
>        // that you used f(i) to represent
>
>        if (n == i) break;
>        i++;
>    } while (1);
>
>but that's just stylistic.  The whitespace before the line with the break will
>grab the eye.
>
>Dave

Sorry, use ++i rather than i++ in that code sample.  I forgot to flip it after
editing your code.

Dave



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