http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44606
--- Comment #10 from David Kühling <dvdkhlng at gmx dot de> 2010-11-02 14:39:12 UTC --- I can reproduce this bug with gcc-4_4-branch SVN HEAD, compiling gcc in cross-compile mode and running the resulting executable with qemu-ppc. Instructions to reproduce everything without any PPC hardware involved (tested on Ubuntu Maverick/AMD64): Get a powerpcspe sysroot: apt-cross -a powerpcspe -S sid -m http://ftp.de.debian.org/debian-ports \ libdb1-compat libdb4.8 libc6 libc6-dev linux-libc-dev \ zlib1g zlib1g-dev libmpfr-dev apt-cross -a powerpcspe -S unreleased -m http://ftp.de.debian.org/debian-ports \ libdb1-compat libdb4.8 libc6 libc6-dev linux-libc-dev \ zlib1g zlib1g-dev libmpfr-dev (repeat a few times until all dependencies resolved) get Debian SID binutils source, then compile&install in cross-compile mode: dpkg-source -x binutils_*.dsc cd binutils-* && \ TARGET=powerpcspe fakeroot debian/rules binary-cross dpkg -i binutils-powepc-linux-gnuspe-*.deb Get GCC from SVN and compile minimal C-only version: svn co svn://gcc.gnu.org/svn/gcc/branches/gcc-4_4-branch mkdir -p build cd build && ../gcc-4_4-branch/configure \ --target=powerpc-linux-gnuspe \ -with-cpu=8548 --enable-e500_double --with-long-double-128 \ --enable-languages=c --disable-multilib \ --prefix=/usr --with-headers=/usr/powerpc-linux-gnuspe/include \ --with-libs=/usr/powerpc-linux-gnuspe/lib make -C build -j5 Compile test-cases available as attachments to this bug, i.e. test.c: build/gcc/xgcc \ -B./build/gcc/ -B/usr/powerpc-linux-gnuspe/bin/ \ -B/usr/powerpc-linux-gnuspe/lib/ \ -isystem /usr/powerpc-linux-gnuspe/include \ -isystem /usr/powerpc-linux-gnuspe/sys-include \ -fverbose-asm -dA -O2 -o test test.c Use Ubuntu's qemu user-space emulation to run resulting executable: rootfs=/usr/powerpc-linux-gnuspe /usr/bin/qemu-ppc -cpu 'MPC8548E_v21' \ -E LD_LIBRARY_PATH=$rootfs/lib/ $rootfs/lib/ld.so.1 \ ./test Repeat the same with -O0 and note the difference. This test fails for all the 3 .c files attached here. Output for tc-resize.c matches the output documented by Sebastian, so I'd say qemu is doing it right.
