https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95121
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- register char x __asm__("dh"); Is the same as: register char x __asm__("di"); dh and dl are the same register really but the high are low parts can be modified seperately via some of the 8bit instructions.