Mail Archives: djgpp/2001/02/07/15:34:21

From: "Miguel A. Ballicora" <ballicor AT msu DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Function and File ordering and speed optimization
Date: Wed, 07 Feb 2001 15:03:43 -0500
Organization: Michigan State University
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References: <3A8049B6 DOT 7C7B7BB1 AT msu DOT edu> <95pk8j$ft4$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE>
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To: djgpp AT delorie DOT com
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Hans-Bernhard Broeker wrote:


> > Do I have to place the function definitions in the same order in one
> > file.c when I compile?
> If you want to achieve that sorting: yes. The order of .o files in
> your command line would also be important.
> > Is djgpp going to follow that sorting?
> Yes. The DJGPP linker doesn't reorder objects itself.

Thanks for the answer and the discussion! very instructive to me.
And that is what I needed to know!. I do not know if this kind of
is going to be useful in my case. Probably not much, but I got curious when I
in RHIDE the name of one of files in the project and I got ~5% reduction in
the the speed.
I renamed the file to the original and I recovered the speed. Apparently,
RHIDE gives
to the compiler and linker the list of files sorted alphabetically, so
renaming files change the function order. I did not play around much with
this, but it looked weird. That is why I thought
that I could optimize the order of the files and functions. When I have time
I will try a little bit
of this. I won't try to sort the whole thing but I will chose the smallest
and hottest functions
the profiler will give me. I won't be a lot of work, I think.
Of course, I have to do other obvious optimizations first, but since speed is
critical to me, I won't
discard anything...


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