is_predicate_p?

[Jason Merrill]

>>>>> "Robert" == Robert Dewar <dewar@gnat.com> writes:

>> Predicates in GCC come in a wide variety of spellings.  Some end in _p,
>> some start with is_, some have _is_ in the middle, some just expect you to
>> know they're predicates based on the meaning of the name.  Should we set
>> some sort of standard spelling for future additions?

> I would have guidelines rather than a standard here. I would avoid the use
> of _p unless you do decide to standardize on this (which seems very dubious
> to me). The use of _p is simply not intuitive. All the other three cases
> sound plausible to me, and I would hesitate to mandate any one over the others.

_p is intuitive to folks coming from a Lisp background, including those of
us who were indoctrinated into the Emacs cult at an early age.  But since
this code has little to do with Lisp, I agree that it is probably the wrong
choice.  It does have a significant representation in the current sources,
though; try a grep of rtl.h.

Jason