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Date: Wed, 28 Nov 2001 14:09:28 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
Reply-To: root@chaos.analogic.com
To: erik@hensema.net
cc: linux-kernel@vger.kernel.org
Subject: Re: Compilation problem in ndisc.c / 2.5.1-pre2 : possible gcc bug?
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Message-ID: <Pine.LNX.3.95.1011128140806.5756A-100000@chaos.analogic.com>
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On 28 Nov 2001, Erik Hensema wrote:

> 
> I've been looking into the compile problems of net/ipv6/ndisc.c in
> 2.5.1-pre2 and I found that the asm generated by gcc (2.95.3) is wrong:
> 
> This is a small part of a diff betweem two asm files generated by gcc, note
> the missing \n's in the wrong code:
> 
> -	
> -		addl 0(%ebp), %edx
> -		adcl 4(%ebp), %edx
> -		adcl 8(%ebp), %edx
> -		adcl 12(%ebp), %edx
> -		adcl 0(%ecx), %edx
> -		adcl 4(%ecx), %edx
> -		adcl 8(%ecx), %edx
> -		adcl 12(%ecx), %edx
> -		adcl %edi, %edx
> -		adcl %eax, %edx
> -		adcl $0, %edx
> -		
> +	addl 0(%ebp), %edxadcl 4(%ebp), %edxadcl 8(%ebp), %edxadcl 12(%ebp), %edxadcl 0(%ecx), %edxadcl 4(%ecx), %edxadcl 8(%ecx), %edxadcl 12(%ecx), %edxadcl %edi, %edxadcl %eax, %edxadcl $0, %edx


This is probably just some loop unrolling, not some as you say "wrong
code".


Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).

    I was going to compile a list of innovations that could be
    attributed to Microsoft. Once I realized that Ctrl-Alt-Del
    was handled in the BIOS, I found that there aren't any.


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