On Mon, Feb 03, 2020 at 12:44:19PM +0000, Richard Sandiford wrote: > Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> writes: > > On Mon, Feb 03, 2020 at 11:04:39AM +0000, Richard Sandiford wrote: > > Wow. Yeah, I don't remember ever seeing this, is size of CC ever used > > at all? > > > >> So one option might be to: > >> > >> - Add a new genmodes.c macro (e.g. CC_MODE_WITH_SIZE) that creates a CC > >> mode with a specific byte size. > > > > But Henri needs CC regs that are three bits. The hardware reg is 12 bits, > > four times three bits, packed, so subregs can still not work after your > > extra macro. > > The idea to use a byte size for the smallest thing that needs to be > addressed individually, then use aggregates for everything else. > It doesn't matter whether that thing has 8 significant bits or not. You cannot *address* the fields that way (except for the lowest one): subreg offsets are in bytes. The sizes do not matter, sure, and those do not cause the ICE Henri saw, iirc. Segher
