I experienced that on ffmpeg elbg.c, I'll attach a delta reduced testcase soon, the issue is trigged by the cflags combination of -O2 and -ftree-vectorize, I hadn't dug on -O2 list to spot which is the exact one.
gcc -O2 -mcpu=cell -ftree-vectorize -ftree-vectorizer-verbose=7 delta/min.c delta/min.c:32: warning: 'struct __gconv_step_data' declared inside parameter list delta/min.c:32: warning: its scope is only this definition or declaration, which is probably not what you want delta/min.c:32: warning: 'struct __gconv_step' declared inside parameter list delta/min.c:34: warning: 'struct __gconv_step' declared inside parameter list delta/min.c:118: note: not vectorized: too many BBs in loop. delta/min.c:116: note: not vectorized: number of iterations cannot be computed. delta/min.c:113: note: vectorized 0 loops in function. delta/min.c:81: note: === vect_analyze_slp === delta/min.c:81: note: === vect_make_slp_decision === delta/min.c:81: note: === vect_detect_hybrid_slp === delta/min.c:81: note: Vectorizing an unaligned access. delta/min.c:81: note: Vectorizing an unaligned access. delta/min.c:81: note: === vect_update_slp_costs_according_to_vf === delta/min.c:81: note: LOOP VECTORIZED. delta/min.c:147: note: vectorized 1 loops in function. delta/min.c: In function 'try_shift_candidate': delta/min.c:147: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. -- Summary: Segfault on -O2 -ftree-vectorize -mabi=altivec with gcc- 4.3.0 from 20071012 Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: lu_zero at gentoo dot org GCC build triplet: powerpc64-unknown-linux-gnu GCC host triplet: powerpc64-unknown-linux-gnu GCC target triplet: powerpc64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33872
