https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79341
--- Comment #37 from Jakub Jelinek <jakub at gcc dot gnu.org> --- The overflow-vec-1.c and vec-2.c on -m64 fail also on ppc64{,le}. Minimum failing testcase is: #define SCHAR_MAX __SCHAR_MAX__ #define SCHAR_MIN (-__SCHAR_MAX__ - 1) typedef signed char VC __attribute__((vector_size (16))); void __attribute__((noinline,noclone)) checkvc (VC i, VC j) { if (__builtin_memcmp (&i, &j, sizeof (VC))) __builtin_abort (); } int main (void) { /* Check that for a vector operation, only the first element with UB is reported. */ volatile VC a = (VC) { 0, SCHAR_MAX - 2, SCHAR_MAX - 2, 3, 2, 3, 4, 5, 0, 7, 1, 2, 3, 4, SCHAR_MAX - 13, SCHAR_MAX }; volatile VC b = (VC) { 5, 2, 1, 5, 0, 1, 2, 7, 8, 9, 10, 11, 6, -2, 13, 0 }; volatile VC k = b + a; checkvc (k, (VC) { 5, SCHAR_MAX, SCHAR_MAX - 1, 8, 2, 4, 6, 12, 8, 16, 11, 13, 9, 2, SCHAR_MAX, SCHAR_MAX }); return 0; } Looking into that now.