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    SubjectRe: Compilation problem in ndisc.c / 2.5.1-pre2 : possible gcc bug?
    Date
    ----- Original Message -----
    From: "Richard B. Johnson" <root@chaos.analogic.com>
    To: <erik@hensema.net>
    Cc: <linux-kernel@vger.kernel.org>
    Sent: Wednesday, November 28, 2001 8:09 PM
    Subject: Re: Compilation problem in ndisc.c / 2.5.1-pre2 : possible gcc bug?


    > 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".

    Correct me if I'm wrong, but I don't think "%edxadcl" really assembles....

    _____________________________________________________
    | Martin Eriksson <nitrax@giron.wox.org>
    | MSc CSE student, department of Computing Science
    | Umeå University, Sweden


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