> > -      unsigned int __max_iter = 1000000;
> > +      unsigned int __max_iter = 65536U;
> 
> Doesn't that need to be 65535U for your purpose?

Yup.  The other three did.

> Should have the runtime license exception.

Added.

> This should not be needed; just using t-fdpbit should suffice for
> almost all targets.

Done.

> > \ No newline at end of file
> 
> As already noted, avoid this.

Fixed.

> > +static int register_sizes[] =
> 
> const?

Yup.

> There are a lot of functions and variables without comments explaining 
> them and their parameters.  (If a function just implements a standard 
> hook, a comment identifying which hook suffices without needing to explain 
> the parameters of that hook again.)

I went through and commented everything in rl78.c at least; I think
the .h and .md are fairly self-documenting.  I put a big comment at
the start of the devirtualization functions giving an overview of the
real/virtual thing.

> > +      if (letter == 'q' || letter == 'Q')
> > +   error ("q/Q modifiers invalid for symbol referencs");
> 
> "referencs" should be "reference" or "references" or similar.  I think 
> this should call output_operand_lossage not error, so that it becomes an 
> error or an ICE as appropriate depending on whether the source of the 
> error is the machine description or an asm.

Done.

> cross compiler configured with --enable-werror-always, on both 32-bit and 
> 64-bit hosts if possible.

I always build on 64 bit :-)

> I think the target-independent changes outside the back end (the ones that 
> are meant as separate bug fixes required by the port) should be posted in 
> separate messages, each with its own rationale.

Will do.

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