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Date: Wed, 12 May 2004 14:40:17 -0700 (PDT)
From: Davide Libenzi <davidel@xmailserver.org>
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To: Ingo Molnar <mingo@elte.hu>
cc: Jeff Garzik <jgarzik@pobox.com>, Greg KH <greg@kroah.com>,
       Andrew Morton <akpm@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Netdev <netdev@oss.sgi.com>
Subject: Re: MSEC_TO_JIFFIES is messed up...
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On Wed, 12 May 2004, Ingo Molnar wrote:

> 
> * Davide Libenzi <davidel@xmailserver.org> wrote:
> 
> > int foo(int i) {
> > 
> > 
> >         return i * 1000 / 1000;
> > }
> 
> try unsigned and you'll see:
> 
>         pushl   %ebp
>         movl    %esp, %ebp
>         movl    8(%ebp), %edx
>         movl    %edx, %eax
>         sall    $2, %eax
>         addl    %edx, %eax
>         leal    0(,%eax,4), %edx
>         addl    %edx, %eax
>         leal    0(,%eax,4), %edx
>         addl    %edx, %eax
>         leal    0(,%eax,8), %edx
>         movl    $274877907, %eax
>         mull    %edx
>         movl    %edx, %eax
>         shrl    $6, %eax
>         leave
>         ret

Yeah, I see.



- Davide