[Bug optimization/11837] New: Stack frame gets corrupted

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11837

           Summary: Stack frame gets corrupted
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mail at andreas-s dot net
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: avr

The following program runs fine when compiled with -O1 or -O2, but with
-Os the function iRealFT() corrupts the stack frame (R29):

http://andreas-s.net/gccbug.tar.gz

Contains (preprocessed) sources, Makefile and elf objects which reproduce the
problem. You can see in the simulator (tried it with simulavr and AVR-Studio 3)
that the return from iRealFT() doesn't work. Sorry that I couldn't provide an
inline example.

gcc 3.3.1 20030720
binutils 2.14 20030727

(PS: why is the Os-compiled binary larger than the O2 and O1 ones?