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
