[tree-ssa] RFC: Making control flow more explicit

[law@redhat.com]

In message <Pine.LNX.4.44.0308120020590.19843-100000@wotan.suse.de>, Michael Ma
tz writes:
 >Hi,
 >
 >On Mon, 11 Aug 2003 law@redhat.com wrote:
 >
 >>  >because parent obviously is not what you want here. IIRC in the ssa dce
 >>  >algorithm marking of the neccesary control statements is somehow
 >>  >done using dominator information.
 >> The RTL version does use dominator information, the tree version does not
 >> use dominator information to find necessary control statements.
 >>
 >> The tree version uses the nested control structure and goto following to
 >> deduce control dependency.
 >
 >The question is, do we eventually somewhen will need postdoms anyway?
Very very rarely within the DCE optimizer.

jeff