Re: Compilation problem in ndisc.c / 2.5.1-pre2 : possible gcc

[David Relson]

At 02:09 PM 11/28/01, you wrote:
>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".

The lack of \n's is wrong.  Adding \n's and some whitespace, gives 
identical code.  Looks like a defective printf() in gcc.

David