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From: sl323 AT city DOT ac DOT uk (Mark Lewis)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: OPTIMIZING EXE SPEED
Date: 28 Sep 1995 11:00:40 GMT
Organization: School of Informatics, City University, London
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References: <DEyssD DOT Inv AT news DOT cis DOT umn DOT edu> <43ijgp$jl AT st-james DOT comp DOT vuw DOT ac DOT nz>
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To: djgpp AT sun DOT soe DOT clarkson DOT edu
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Malcolm Taylor (empty AT sans DOT vuw DOT ac DOT nz) wrote:
> kari0022 AT gold DOT tc DOT umn DOT edu wrote:
> : I recently switched from Borland TurboC to djgpp. The EXE's that I get after compiling
> :  run much, much faster. However, in TurboC you could optimize your EXE for either
> :  speed, or size. How can I completely 100% optimize my EXE's in djgpp for speed?
> :  How about the other way around, for size? In both cases, I want to completely ignore
> :  the other one, like I want a really really fast executable, and I really don't care
> :  at all how large it is.

> gcc -O3 ...
>  will optimize for speed, using inline functions, and inlining small 
> functions at the compilers discretion...
[ Stuff Deleted ]

From memory, I think -O optimisation tries to avoid code bloat, so this
should produce smaller executables.  In all cases, NOT using the -g flag and
using 'strip' on the binary before converting it to an executable using
coff2exe will give you a considerable reduction in code size.

> Read the documentation for gcc (info gcc) about the -O command.

Yep, the docs on gcc command-line arguments are very comprehensive.

	Mark.

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