how difficult to make UNITS_PER_WORD 1

[Dave Milter <davemilter at gmail dot com>]

Hello,

I try to make estimation of time and efforts to implement support of
one CPU in gcc 4.x.

The main problem, as can I see, that CPU can only access memory  using
 32bit word as unit.

I try to play with ggx:
http://spindazzle.org/ggx/

and force it to work with memory like above mentioined CPU:

#define UNITS_PER_WORD 1
#define BITS_PER_UNIT 32
#define BITS_PER_WORD 32
#define POINTER_SIZE 32

but this cause a segfault in builtin_define_float_constants.

The old implementation for this CPU based on 3.3.x branch uses trick like this:
#define QImode SImode

but now it does not work.

I define Pmode to QImode but this also not helps, it still catch segfault.

Can anybody with deep knowledge in gcc, describe a little,
the main steps to force compiler generate code for UINTS_PER_WORD==1 target?