Re: [avr-gcc-list] avr-gcc (GCC) 3.4.5 Bug: copying structure through pointer will destroy the pointer

[Eric Weddington]

Joerg Wunsch wrote:
> "Dmitry K." <address@hidden> wrote:
>
>
> > > Here's the smallest reproducible test case:
>
>
> > Avr-gcc 3.3.5 is correct:
>
>
> By trial & error, I narrowed it down to be a change between GCC 3.4.3
> and GCC 3.4.4.  After reviewing the ChangeLog, the following caught my
> attention:
>
> 2005-03-19  Andy Hutchinson  <address@hidden>
>
>        PR target/18251
>        * config/avr/avr.md (movstrhi): Rewrite as RTL loop.
>        (*movstrqi_insn): Delete.
>        (*movstrhi): Delete.
>
> It corresponds to the following SVN log entry:
>
> Revision 96732 - (view) (download) - [select for diffs]
> Modified Sat Mar 19 15:45:41 2005 UTC (11 months, 1 week ago) by marekm
> File length: 79688 byte(s)
> Diff to previous 96394 (colored)
>
>         PR target/18251
>         * config/avr/avr.md (movstrhi): Rewrite as RTL loop.
>         (*movstrqi_insn): Delete.
>         (*movstrhi): Delete.
>
> I'm attaching the diff that caused it.  If I unpatch a GCC 3.4.4
> (using patch -p2 -R < avr.md.patch -- remember you have to revert the
> original change, thus the -R), it generates the correct code again.

Please be sure to put this in the bug report, which should be IIRC:
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26118>

Also, it wouldn't hurt to also notify Denis Chertykov too.

Thanks
Eric