Richard Guenther wrote:
The most interesting pass change is the removal of the first
DOM/phi-cprop pair. DOM mostly deals with jump-threading at this
place and for tramp3d catches 473 threads on top of the 2555 ones
performed by the VRP pass that runs right before the first DOM.
Ultimately, jump threading is all I really want DOM to do long term
anyway -- the redundancy elimination performed by DOM can be better
handled elsewhere. The interesting question is there redundancy
elimination left in DOM that is unique and if not, can we get the same
overall effect if we remove the redundancy elimination from DOM and
instead using existing passes for redundancy elimination. Same overall
effect doesn't mean identical code, but reasonably close and without
incurring a significant compile-time hit.
Regardless, I fully support eliminating the number of calls into DOM as
well as trimming the set of transformations performed by DOM.
jeff
