https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66247
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- static const int offset[] = { -2, -1, 0, 1, 2, 3 }; ... for (oindex = 0; oindex <= (int) (sizeof (offset) / sizeof ((offset)[0])); oindex++) { o = offset[oindex]; if ((int) isize*(64 - 0) < -o) continue; (unless the test is exiting the loop through exit (1);) seems to be undefined behavior, for offset[6] you can only validly takes its address, but not dereference it.