https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98789
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |jakub at gcc dot gnu.org Resolution|--- |INVALID --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- unsigned long int is 64-bit rather than 32-bit on x86_64. So expecting your ROTATE_LEFT macro to perform rotation is just incorrect assumption.