linux-kernel - Re: [PATCH] crc32: remove useless _

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Message-Id: <1236014911.18284.89.camel@penberg-laptop>
Date:	Mon, 02 Mar 2009 19:28:31 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Thiago Galesi <thiagogalesi@...il.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crc32: remove useless __pure modifier from functions

On Mon, 2009-03-02 at 12:50 -0300, Thiago Galesi wrote:
> Actually, the effects of most keywords (like const, etc) affect things
> outside of the module (the callers)
> 
> http://gcc.gnu.org/onlinedocs/gcc-4.2.0/gcc/Function-Attributes.html
> has a good explanation.
> 
> Briefly, a _pure function only depends on its parameters and the only
> return is via the function return, so the compiler can optimize some
> of its calls away.

Hmm. They're not marked as pure in the header files. Does GCC look it up
from the object file or something for this...?

			Pekka

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