Use predicates for RTL objects

[Arvind Sankar]

On Thu, Aug 08, 2019 at 08:31:28AM -0600, Jeff Law wrote:
> True, but they could be.  When David was working in this space a few
> years ago I concluded that the main value in sub-classing the various
> RTL operators just wansn't worth the effort.  Instead we focused on
> starting to tear apart things like the toplevel objects into rtx_insn
> and the like.  THere's little value in treating those as simple RTXs.
> INSN_LIST and the like were also ripe for this treatment.
> 
> The biggest value in making a real class for the operators things would
> be to move the runtime RTL checking into a compile-time check.  But I
> couldn't really green light something like that without first completing
> the rtx_insn changes.

Are there any notes or old discussion threads on what remains? I would
be interested in taking a look if no-one else is.

Thanks

> 
> > 
> > 
> > If you really want to convert RTL to C++, you should start with getting
> > rid of rtx_format and rtx_class, and make REG_P etc. work just as they
> > have always done.
> Yup.  And continue pushing the rtx_insn bits deeper, tackling INSN_LIST,
> etc.
> 
> jeff