linux-kernel - Re: [PATCH] Make shr to divide by power of 2

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Message-ID: <20090807074251.GB3004@localdomain.by>
Date:	Fri, 7 Aug 2009 10:42:51 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make shr to divide by power of 2

On (08/07/09 08:50), Andi Kleen wrote:
> Sergey Senozhatsky <sergey.senozhatsky@...il.com> writes:
> >
> > Of course, compiler supposed to do something like
> > 	add    $0x7,%eax
> > 	shr    $0x3,%eax
> > instead of div. Should we rely on this?
> 
> Yes. We should rely on this. 
> 

grep -cR '>> 3' bitblit.c 
5

and only 1 '/8'.

	Sergey

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