RFC: ssa subvariables for complex types

[Richard Guenther]

On 4/18/06, Aldy Hernandez <aldyh@redhat.com> wrote:
> > losing a slight missed optimization on the tree level.
>
> Yay, exactly what I'm trying to fix.  Glad you agree.

You can try disabling the write_only heuristic completely on mem-ssa branch
and see if you get huge regressions on the compile time of fortran polyhedron
benchmark.  If you do, you might want to explore other ways of
"fixing" this problem.
On mainline I cannot see a way around this hack other than maybe imposing some
per-function number-of-SFTs limit or so.  But then, structures only
written to (in a sane
way) are usually not worth decomposing (which was my observation with
the fortran
testcase).

Richard.