Why are one-bit bitfields not allowed? I'm trying to support a BSET/BCLR pair that *only* support single bit fields, for I/O ports, which are always volatile (and thus you have to use insv, as gcc won't do a "or #1,port5" if port5 is volatile).
if (HAVE_insv
&& GET_MODE (value) != BLKmode
&& !(bitsize == 1 && GET_CODE (value) == CONST_INT)
So... why is it illegal to put a constant into a single bit field?
