SH: use register names instead of numbers

[Zack Weinberg]

On Wed, Nov 22, 2000 at 12:10:33AM +0000, Joern Rennecke wrote:
> > One, documentation needs to be added to md.texi.  Two, 
> > 
> > > + hashtab.o: $(srcdir)/../libiberty/hashtab.c $(CONFIG_H)
> > > + 	rm -f hashtab.c
> > > + 	$(LN_S) $(srcdir)/../libiberty/hashtab.c hashtab.c
> > > + 	$(CC) -c $(ALL_CFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) hashtab.c
> > 
> > This needs to be using HOST_CC etc.
> 
> Done.  I have also resolved a few merge problems with the most recent
> fsf sources.  Most notably, I had to put xcalloc into gensupport.c
> (libiberty/xmalloc.c has it, but it not only needs xexit, but also provides
>  lots of functions that are already in gensupport.c .)

This looks good to me.  I'm wondering why you parsed the expression by
hand instead of creating a new DEFINE_CONSTANTS RTL code, as is done
for all other define_* expressions.

As a separate patch, I think it'd be a good idea to split the md-file
reader out of rtl.c.  It could go either in gensupport.c or a new
read-rtl.c.  The compiler proper doesn't use it, so it's just wasting
space there.  Not much space at the moment, but when we do a complete
macro preprocessor with support for include files and conditional
blocks, it'll get bigger.

Doc nitpicks:

> + @section Constant Definitions
> + @cindex constant definitions
> + @findex define_constants
> + 
> + Using literal constants inside instruction patterns reduced legibility and

... reduceS legibility ...



> + To overcome these problems, the @code{define_constants} built-in
> + is provided.  It contains a vector of name-value pairs.

This paragraph isn't very detailed and doesn't match the style of the
rest of the document.  I suggest instead

  To overcome this problem, you may use the @code{define_constants}
  expression.  It contains a vector of name-value pairs.  From that
  point on, wherever any of the names appears in the MD file, it is as
  if the corresponding value had been written instead.  You may use
  @code{define_constants} multiple times; each appearance adds more
  constants to the table.  It is an error to redefine a constant with
  a different value.

zw