When the attached source file is compiled with 'gcc -O3 -c', the code that uses it produces wrong results. The problem disappears if 'gcc -O3 -fno-inline -c' or if the variables inside 'generate_point_symmetry' are declared as 'static'.
This is the output of gcc-4.3 -v : Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ../gcc-4.3/configure --prefix=/opt/gcc/ --program-suffix=-4.3 --enable-languages=c,fortran,c++ --with-arch=core2 --enable-libgomp Thread model: posix gcc version 4.3.1 20080419 (prerelease) (GCC) This is the system: Linux corvo 2.6.24.2-corvo-001 #3 SMP PREEMPT x86_64 GNU/Linux distribution is Debian GNU/Linux 4.0 -- Summary: Function produces wrong results when inlined. Product: gcc Version: 4.3.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: xavier at tddft dot org GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36008