linux-kernel - Re: [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization

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Message-ID: <20070623131355.GO23017@stusta.de>
Date:	Sat, 23 Jun 2007 15:13:55 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Oleg Verych <olecom@...wer.upol.cz>
Cc:	Denis Cheng <crquan@...il.com>, trivial@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trivial: the memset operation on a automatic array
	variable should be optimized out by data initialization

On Sat, Jun 23, 2007 at 09:59:33AM +0200, Oleg Verych wrote:
> * From: Denis Cheng
> * Newsgroups: linux.kernel
> * Date: Fri, 22 Jun 2007 22:15:49 -0700 (PDT)
>  
> > From: Denis Cheng <crquan@...il.com>
> >
> > the explicit memset call could be optimized out by data initialization,
> > thus all the fill working can be done by the compiler implicitly.
> 
> Can be optimized and can be done by compiler are just words;
> 
> > and C standard guaranteed all the unspecified data field initialized to zero.
> 
> standards and implementation are on opposite poles of magnet

Bullshit.

We expect a C compiler, and if a C compiler violates the C standard 
that's a bug in the compiler that has to be fixed.

And gcc is usually quite good in following the C standard.

> > Signed-off-by: Denis Cheng <crquan@...il.com>
> >
> > ---
> > After comments in the former threads:
> > http://lkml.org/lkml/2007/6/18/119
> 
> i see a patch
> 
> > http://lkml.org/lkml/2007/6/18/48
> 
> same patch.
>...

Open your eyes and you'll find thread overviews at the left side of 
the URLs he gave...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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