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Re: selection-sort in C

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On Tue, 16 Aug 2011 13:22:59 +0100
Ben Bacarisse <ben.usenet@bsb.me.uk> wrote:

> arnuld <sunrise@invalid.address> writes:
> 
> >[...]
> >
> > I like to keep things in as small scope as possible but then here it will 
> > initialize the variable on each looping. I thought assignment is less 
> > expensive than initialization.
> 
> Why do you think that?  I am genuinely interested.  I never thought
> about it one way or the other so I wonder where the idea comes from.

If the compiler would do the allocation (i. e. reserving space on the
stack) exactly where it's requested, it would be more expensive to
declare the variable inside the loop. But I doubt that any optimizing
compiler would do that in this case; the allocation would be moved
outside the loop, or possibly the variable is allocated in a free
register, so allocating the variable inside the loop isn't any more
expensive than outside.

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Thread

selection-sort in C arnuld <sunrise@invalid.address> - 2011-08-16 11:08 +0000
  Re: selection-sort in C Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-08-16 14:24 +0300
    Re: selection-sort in C arnuld <sunrise@invalid.address> - 2011-08-16 11:36 +0000
      Re: selection-sort in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-08-16 13:22 +0100
        Re: selection-sort in C arnuld <sunrise@invalid.address> - 2011-08-16 13:44 +0000
          Re: selection-sort in C Anand Hariharan <mailto.anand.hariharan@gmail.com> - 2011-08-16 07:36 -0700
        Re: selection-sort in C Thomas Boell <tboell@domain.invalid> - 2011-08-16 18:03 +0200
          Re: selection-sort in C karnath <karnathtorjian@gmail.com> - 2011-08-16 16:25 +0000
            Re: selection-sort in C Willem <willem@toad.stack.nl> - 2011-08-16 16:33 +0000
          Re: selection-sort in C Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-08-16 20:03 +0100
        Re: selection-sort in C Keith Thompson <kst-u@mib.org> - 2011-08-16 09:27 -0700
      Re: selection-sort in C Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-17 20:17 +0000
        Re: selection-sort in C pete <pfiland@mindspring.com> - 2011-08-18 00:41 -0400
          Re: selection-sort in C Ben Pfaff <blp@cs.stanford.edu> - 2011-08-17 21:52 -0700
            Re: selection-sort in C pete <pfiland@mindspring.com> - 2011-08-18 01:07 -0400
              Re: selection-sort in C blp@cs.stanford.edu (Ben Pfaff) - 2011-08-17 22:36 -0700
                Re: selection-sort in C pete <pfiland@mindspring.com> - 2011-08-18 07:00 -0400
    Re: selection-sort in C BGB <cr88192@hotmail.com> - 2011-08-16 14:41 -0700
      Re: selection-sort in C Ian Collins <ian-news@hotmail.com> - 2011-08-17 10:10 +1200
        Re: selection-sort in C BGB <cr88192@hotmail.com> - 2011-08-16 17:25 -0700
          Re: selection-sort in C pacman@kosh.dhis.org (Alan Curry) - 2011-08-17 01:53 +0000
  Re: selection-sort in C Gene <gene.ressler@gmail.com> - 2011-08-16 05:27 -0700
  Re: selection-sort in C Malcolm McLean <malcolm.mclean5@btinternet.com> - 2011-08-16 07:24 -0700
  Re: selection-sort in C pete <pfiland@mindspring.com> - 2011-08-16 19:22 -0400
    Re: selection-sort in C arnuld <sunrise@invalid.address> - 2011-08-17 07:52 +0000
      Re: selection-sort in C Angel <angel+news@spamcop.net> - 2011-08-17 10:15 +0000
      Re: selection-sort in C Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-08-17 13:22 +0300
      Re: selection-sort in C pete <pfiland@mindspring.com> - 2011-08-18 00:33 -0400

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