I have found this bug when playing a bit with the vector_size attribute. To reproduce just compile the attached program with
gcc -march=pentium4 runsimd.c Result: runsimd.c:1: internal compiler error: in round_up, at fold-const.c:11606 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. -- Summary: Internal compiler error when specifying vector_size(2) Product: gcc Version: 4.0.2 Status: UNCONFIRMED Severity: major Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: guilhem at kaffe dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25559
