[tree-ssa] Re: PATCH: [gcc3.5 improvement branch] Very Simple constant propagation

[law@redhat.com]

In message <20040116001814.GA13682@kam.mff.cuni.cz>, Jan Hubicka writes:
 >Yes, I invented that code some time ago.  I really think that in
 >post-SSA world we should not do the trick on RTL.
Agreed.

 >  Perhaps the patch
 >would need to wait for SSA equivalent of this transform that I can do
 >soon if this is considered important feature.
Precisely.

 >Dom doesn't have def-use chains readilly available, right?
Nope, but it wouldn't be that hard to make then available (keeping them
up-to-date might be more difficult).

My question is does this belong in dom at all.  While we might want to
do it as part of a dominator walk or other transforming pass, I don't
see that it needs to live in the current dominator optimizer.  Unless
it's like to expose lots of additional optimization opportunities.


jeff