https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106895
--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> --- (In reply to Segher Boessenkool from comment #5) > Constraints are completely the wrong tool for this. Just use modes, which > *are* the right tool? Well you cannot specify modes in the asm, so I think you're saying we need use the correct type that maps to a internal to GCC mode that has the even/odd register behavior, so something like: unsigned int foo __attribute__ ((mode (XX))); ...where XXmode is the new integer mode that gives us even/odd register pairs? Of course we have to be careful about how this all works wrt -m32 versus -m64.
