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From:	schaecsn <schaecsn AT gmx DOT de>
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Subject:	Re: GCC 3.03 makes slow code
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Date:	Thu, 17 Jan 2002 05:56:15 GMT
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

"Daniel Lidström" wrote:
> 
> "no spam" <no AT spam DOT com> wrote...
> > I was testing the latest GCC 3.03 (djgpp) and compiled an application
> > using switches -O9 -fomit-frame-pointer -mcpu=pentium -fschedule-insns2
> > -fexpensive-optimizations the code it generated run 10-20% slower (on
> > Celeron-A CPU) compared to a version compiled with GCC 2.95 (using
> > identical switches).
> 
> Are you sure there is a optimization switch -O9? When I read the man pages
> of gcc 2.95.3-5 (cygwin) the -O option only goes to -O3.

everything above 03 falls back to 03. so you can use the same makefile
for compilers with higher optimization numbers. C compilers are
sometimes plattform independent ;-)

- Stefan

-- 
   ___  ___       __         |   Name: Stefan Schäckeler
  /  / /  /____  (__)__  ___ | E-mail: schaecsn AT gmx DOT de
 /  /_/  /  _  \/  /\  \/  / |    day: Windows 2000,        HP-UX 11
 \___,__/__//__/__/ /__/\__\ |  night: Linux 2.4, NetBSD-Alpha 1.5.2

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