Need help at writing basic igen simulator

[Andrew Cagney]

If you leave this out:

> {
> 	/* TODO */
> }

igen should automatically generate code to throw an unimplemented 
instruction exception.

> If i write the instruction identifer in hexform like this
> "8.0xe3,8.reg,16.value::::setl" igen fails with "ld-insn.c:293: assertion
> failed - word->first->last < 0" it this the correct behavior.

Hmm, forgotten that it was possible to specify hex values.  Looking at 
the mn10300, I think you need:

:option:::insn-specifying-widths:true

I've not tried to bring up an IGEN simulator from scratch for some years 
- the onces I worked on were rewrites of existing hand written simulators.

Andrew