[PATCH] Overhaul __builtin_constant_p processing (take 2)

[Neil Booth]

Roger Sayle wrote:-

> > Hmm.  Ok, one last question: what impact does this have on
> > compile times?
> 
> Mainline CVS:
> real	62m27.428s
> user	53m35.360s
> sys	 8m31.900s
> 
> With patch below:
> real	62m47.929s
> user	 54m3.140s
> sys	  9m0.130s
> 
> 
> There's a reproduceable slow down of about 28s, about 0.87%, of a
> full three stage bootstrap, all languages except Ada and treelang,

I think it's really important we stop this gradual rot.

Neil.