http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50131
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-08-20 08:32:12 UTC --- Is or $-1, reg on all CPUs equally expensive to mov $-1, reg though (as or generally needs the previous reg content while mov does not; I know some CPUs special case xor reg, reg, but I doubt or $-1, reg is special cased)?