[Bug middle-end/33638] optimization bug: wrong code with -fforce-addr

["manfred99 at gmx dot ch" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from manfred99 at gmx dot ch  2007-10-05 09:36 -------
Ok, I managed to produce a testcase: a wrapper around the miscompiled
function and all the missing routines. Input data is read from a binary file,
so the program has to be run on a x86 machine (littleendian).

I attach a tar file with all these things, including program output of a
good and a bad run.

good.out is an output of
# gcc -O2 -march=pentium4 -c mova2i.c
# gfortran -O2 -march=pentium4 -o main main.f \
    comunpack.f rdieee.f gbytesc.f mova2i.o
# ./main > good.out

bad.out likewise, but with "-O2 -march=pentium4 -fforce-addr" (the
additional flag only matters to comunpack.f, the other routines seem
not to be affected and can be compiled arbitrarily).

Hope this helps.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33638