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

[Joerg Wunsch]

"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.

-- 
J"org Wunsch                                           Unix support engineer
address@hidden        http://www.interface-systems.de/~j/

avr.md.patch
Description: Text document