Platform: Fedora release 7 (Moonshine) Linux idle.lbl.gov 2.6.22.9-91.fc7 #1 SMP Thu Sep 27 20:47:39 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
% g++ -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: /net/rosie/scratch2/rwgk/gcc_trunk/configure --prefix=/net/cci-filer1/vol1/tmp/rwgk/gcc_trunk_130159_x86_64_fc7 --enable-languages=c,c++,fortran --with-mpfr=/usr Thread model: posix gcc version 4.3.0 20071113 (experimental) (GCC) I'll attach a small reproducer. It works with -O0: % g++ -O0 -Wall multiply_bug.cpp -fno-strict-aliasing && ./a.out (7,4) But doesn't with -O1 or higher: % g++ -O1 -Wall multiply_bug.cpp -fno-strict-aliasing && ./a.out (0,0) The reproducer #includes complex. I'm guessing it wouldn't be hard to reduce the reproducer if necessary. Ralf -- Summary: optimizer problem Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: rwgk at yahoo dot com GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34099