https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92425
Florian Weimer <fw at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fw at gcc dot gnu.org --- Comment #3 from Florian Weimer <fw at gcc dot gnu.org> --- In general, the 32-bit opcodes clear the upper 32 bits of the 64 bit registers. They do not just operate on the lower 32 bits.