[Bug c/11949] New: Compiler segfault with ffmpeg altivec code

["dr at jones dot dk" <gcc-bugzilla at gcc dot gnu dot org>]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11949

           Summary: Compiler segfault with ffmpeg altivec code
           Product: gcc
           Version: 3.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dr at jones dot dk
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-linux
  GCC host triplet: powerpc-linux
GCC target triplet: powerpc-linux

Using up-to-date Debian GNU/Linux unstable and attempting to compile CVS
snapshot of ffmpeg on my 1st generation Apple PowerBook G4 (Tibook) the
following happens:

LANG=C gcc -maltivec -mabi=altivec -Wall -g -DHAVE_AV_CONFIG_H -I..
-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE -c -o
ppc/idct_altivec.o ppc/idct_altivec.c
ppc/idct_altivec.c:164: internal compiler error: Segmentation fault
Please submit a full bug report,

The mentioned line 164 is the end of this:

static const vector_s16_t constants[5] = {
    (vector_s16_t) AVV(23170, 13573, 6518, 21895, -23170, -21895, 32, 31),
    (vector_s16_t) AVV(16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725),
    (vector_s16_t) AVV(22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521),
    (vector_s16_t) AVV(21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692),
    (vector_s16_t) AVV(19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722)
};

Following your instructions here's the more verbose output:

LANG=C gcc -v -save-temps -maltivec -mabi=altivec -Wall -g -DHAVE_AV_CONFIG_H
-I.. -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE -c -o
ppc/idct_altivec.o ppc/idct_altivec.c
Reading specs from /usr/lib/gcc-lib/powerpc-linux/3.3.2/specs
Configured with: ../src/configure -v
--enable-languages=c,c++,java,f77,pascal,objc,ada --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib
--enable-nls --without-included-gettext --enable-__cxa_atexit
--enable-clocale=gnu --enable-java-gc=boehm --enable-java-awt=xlib
--enable-objc-gc --disable-multilib powerpc-linux
Thread model: posix
gcc version 3.3.2 20030812 (Debian prerelease)
 /usr/lib/gcc-lib/powerpc-linux/3.3.2/cc1 -E -quiet -v -I.. -D__GNUC__=3
-D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=2 -D__unix__ -D__gnu_linux__
-D__linux__ -Dunix -D__unix -Dlinux -D__linux -Asystem=unix -Asystem=posix
-DHAVE_AV_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_GNU_SOURCE
ppc/idct_altivec.c -maltivec -mabi=altivec -Wall idct_altivec.i
ignoring nonexistent directory "/usr/powerpc-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 ..
 /usr/local/include
 /usr/lib/gcc-lib/powerpc-linux/3.3.2/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/powerpc-linux/3.3.2/cc1 -fpreprocessed idct_altivec.i -quiet
-dumpbase idct_altivec.c -maltivec -mabi=altivec -auxbase-strip
ppc/idct_altivec.o -g -Wall -version -o idct_altivec.s
GNU C version 3.3.2 20030812 (Debian prerelease) (powerpc-linux)
        compiled by GNU C version 3.3.2 20030812 (Debian prerelease).
GGC heuristics: --param ggc-min-expand=55 --param ggc-min-heapsize=48089
ppc/idct_altivec.c:164: internal compiler error: Segmentation fault
Please submit a full bug report,

Please guide me if you need me to do dig up more info or do some tests. I can't
really code myself, only compile written code and mess around with scripts (I do
Debian package maintainance), so spell it out if you want me to use a debugger
or other woodo.

(hmm - let's see if I can figure out how to attach the *.i.bz2 file to this
bugreport when filed, there is no "attach" button on the current page...)