[RFC] avoiding too narrow register classes in reload

[Dave Korn]

> -----Original Message-----
> From: gcc-owner On Behalf Of Alexandre Oliva
> Sent: 15 December 2004 20:07

> On Dec 15, 2004, Richard Henderson wrote:
> 

> > Ok, except,

> >> -		  if (reg_class_size[this_alternative[i]] == 1
> >> +		  if (reg_class_size[this_alternative[i]] > 0
> >> +		      && SMALL_REGISTER_CLASS_P (this_alternative[i])
> 
> > reg_class_size check redundant with SMALL_REGISTER_CLASS_P.
> 
> I thought I'd leave it in for, like, documentation purposes, just in
> case someone reworks SMALL_REGISTER_CLASS_P such that it can match
> even for 0-sized classes, but fine.  


  As long as it's not in a critical inner loop, I always feel that a couple of
memory accesses and a test-and-branch are a small price to pay for having code
that clearly self-documents the intent behind it.  But hey, no big deal :)


    cheers, 
      DaveK
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