RET
#define RET(reg) "mov pc, "#reg
#define RET(reg) "bx "#reg
#define RET jmp __x86_return_thunk
#define RET ret; int3
#define RET ret
RET = 3, /* tramp / site cond-tail-call */
#define RET(args...) \
#define RET(args...) return args
#define RET(a) ((union cmdret *)(a))