Self-compile and mlton.cm

[Stephen Weeks]

> I'm having problems doing a self-compile with the 20001004 version I
> downloaded yesterday.  I'm getting an "x_221 has no operand property"
> error being raised in the backend/allocate-registers phase.  The only
> modifications I made to anything outside the x86-codegen directory were
> fairly minor.  The nj-mlton version builds fine, and that passes all of
> the regression tests and benchmarks.  It's just when I turn that on
> mlton.sml that it fails.  One other difference is that I'm constructing a
> mlton.sml in the following way:
> mlton -stop f mlton.cm | xargs cat > mlton.sml
> (just because some of my scripts were relying on a .sml file).  If there
> were parsing and typechecking errors, I would have thought my sources.cm
> file was wrong, but there aren't.  Any ideas?

It's probably just a plain old bug in allocate-registers.  You are feeding a new 
input to MLton, namely MLton with your new backend.  This may just be tripping a 
bug.  There was a change to the register allocator on 2000-8-8, so it's not been 
stable that long.  Send me the entire .sml file and I'll look at it.  For now,
I'm re-testing a virgin 20001004 to make sure it can self compile.