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Date: Sat, 23 Feb 2002 16:00:07 +0100
From: Martin Dalecki <dalecki@evision-ventures.com>
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To: Andrew Morton <akpm@zip.com.au>
CC: Larry McVoy <lm@bitmover.com>, Justin Piszcz <war@starband.net>,
        linux-kernel@vger.kernel.org
Subject: Re: gcc-2.95.3 vs gcc-3.0.4
In-Reply-To: <3C771D29.942A07C2@starband.net>,		<3C771D29.942A07C2@starband.net>; from war@starband.net on Fri, Feb 22, 2002 at 11:40:09PM -0500 <20020222204456.O11156@work.bitmover.com> <3C77270A.1CBA02E8@zip.com.au>
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Andrew Morton wrote:
> Larry McVoy wrote:
> 
>>Try 2.72, it's almost twice as fast as 2.95 for builds.  For BK, at least,
>>we don't see any benefit from the slower compiler, the code runs the same
>>either way.
>>
>>
> 
> Amen.
> 
> I want 2.7.2.3 back, but it was the name:value struct initialiser
> bug which killed that off.  2.91.66 isn't much slower than 2.7.x,
> and it's what I use.
> 
> "almost twice as fast"?  That means that 2.7.2 vs 3.x is getting
> up to a 3x difference.  Does anyone know why?

Yes. Basically the reason is a missconception what the compiler
should try to optimize in GCC.

> 
> [ Of course, if you can wink-in the object file from someone else,
>   it's not a problem.  (tum, tee tum...) ]
> 
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