machine-dependent Passes on GIMPLE/SSA Tree's?

[Jeffrey Law]

On Mon, 2006-11-27 at 13:08 -0500, Diego Novillo wrote:
> Markus Franke wrote on 11/27/06 12:50:
> 
> > Are there also some other optimisation passes working on the GIMPLE/SSA
> > representation which make use of any machine-dependent features?
> > 
> Yes.  Passes like vectorization and loop optimizations will use so 
> called 'target hooks' which allow the high-level passes to query the 
> target for various capabilities and attributes.  See the tree-vect*.c 
> files for several examples.
Note that in general we're trying to avoid introducing target dependent
stuff into the gimple/SSA optimizers.  We should consider the
vectorization code as the exception rather than the rule for this
kind of thing.

Jeff