https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78135
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > wk = 0x100000000 << j; > > That is still int << j That is not true, that is actually either long int << j or long long int << j on most targets (e.g. LP64 the former and ILP32 the latter). Otherwise, on 32-bit int targets, 1 << 31 is defined in C++, but is INT_MIN then, i.e. negative, and undefined behavior in C99/C11 (just try -fsanitize=undefined). And, again on 32-bit int targets, (1 << 24) << 7 is well defined, but 0.
