Date:	Tue, 9 Mar 1999 17:53:12 +0100
To:	pgcc AT delorie DOT com
Subject:	Re: gcc-2.7.0 creates faster code than pgcc-1.1.1
Message-ID:	<19990309175312.G2217@cerebro.laendle>
Mail-Followup-To:	pgcc AT delorie DOT com
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In-Reply-To:	<36DDD2C1.421DD4AF@t-online.de>; from Hans-Peter Jansen on Thu, Mar 04, 1999 at 01:24:33AM +0100
X-Operating-System:	Linux version 2.2.2 (marc AT cerebro) (gcc driver version pgcc-2.93.04 19990131 (gcc2 ss-980929 experimental) executing gcc version 2.7.2.3)
From:	Marc Lehmann <pcg AT goof DOT com>
Reply-To:	pgcc AT delorie DOT com
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On Thu, Mar 04, 1999 at 01:24:33AM +0100, Hans-Peter Jansen wrote:
> 
> # pgcc fail:
> # -fcompare-elim -floop-after-global -fcombine-222
> 
> all at the expense of a significant bigger binary.
> 
> This really desillusionized me about the capabilities of all this
> funky optimizing stuff... Mostly they are not worth the bigger size
> they need (and the time figuring out the best switches). 
> 
> Real optimisation happens in the design phase of a project.
> The compiler can help you getting the most of it!
> 
> Correct me, if I'm wrong.
> 
> Sorry, Marc. Please don't feel offended. As I'm an optimist, I will
> look forward and see, how I can help you to get behind it...

I don't feel offended, but on which CPU did you do your tests? My
slackware 1995 binary runs significantly slower on my machine (p-ii) than
the pgcc compiled ones, that is with current pgcc as well as the old libc5
binary that we happen to have on our homepage.

This is with the snapshot pgcc, btw. The release might have some
hand-tuning to be correct rather than fast in some cases.

--  
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      ---==---(_)__  __ ____  __       Marc Lehmann      +--
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    The choice of a GNU generation                       |
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