Re: [ssaupdate] Local dominance info

[Michael Matz <matz@suse.de>]

Hi,

On Wed, 20 Oct 2004, Andrew MacLeod wrote:

> > > This strikes me *much* more as a local thing that an individual pass
> > > might be interested in, and so should number the stmt's itself for the
> > > duration of its interest. 
> > 
> > Still you would need some mechanism to update things when statements are
> > inserted, so this would make things only more complicated.
> 
> and what wrong with the local_dom_insert_after() and
> local_dom_insert_before() which call the bsi routines? It looks pretty
> trivial to do that,  then the info only exists and is maintained when
> you want it.

But then you have to ask yourself everytime you add stmts if you want to 
use these or the normal inserters.  And what about common code which 
inserts statements?  Do we need two versions of them too?

Generally I think there should be exactly one interface to do something 
(inserting stmts), so if maintaining this local numbering doesn't cost 
much it would be much cleaner to do this, instead of relying on special 
case code.

Why exactly would you like to have this keeping of information be factored 
out?

> I don't see any reason why it should be kept up to date all the time
> when virtually no-one else cares about it.

Cleanlyness of interfaces?  Less potential for funny bugs because the 
wrong inserters were used by some common code?


Ciao,
Michael.