From: e8725229 AT stud1 DOT tuwien DOT ac DOT at (godzilla)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: I don't understand djgpp's optimizations
Date: Fri, 04 Apr 97 08:55:36 GMT
Organization: Vienna University of Technology, Austria
Lines: 18
Message-ID: <5i2fm8$b34_001@tuwien.ac.at>
References: <33440E51 DOT 6AE AT imaginet DOT fr>
NNTP-Posting-Host: tubiomed.tuwien.ac.at
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

In article <33440E51 DOT 6AE AT imaginet DOT fr>, DoLooP <kst AT imaginet DOT fr> wrote:
>I'm new in c coding, and i'm trying djggp because a lot of demoscoder
>says that this is THE best compiler. So i try a simple 50000 loop with a
>calcul in it. i've done a time mesure and the code generated is really
>NOT speed comparing to what the watcom c gives to me. it run 2 times
>better in watcom flat mode. i've used -o2 -forcemem -forceaddr
>-fstrengh...   flags. (and perhaps some other one). could someone help
>me ?
>
>
>kst AT imaginet DOT fr
i'm using '-O3 -ffast-math -funroll-loops -fomit-frame-pointer' and the 
runtime-difference to watcom-generated code is usually between 10 and 20 %
(my loops are huge and no so simple)
nonetheless i prefer djgpp :-)
greetings

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