On 07/07/15 17:58, Tom de Vries wrote:
If you can
handle one exit edge I also can't see the difficulty in handling
all exit edges.
Agreed, that doesn't look to complicated. I could call
rewrite_virtuals_into_loop_closed_ssa for all loops in
rewrite_virtuals_into_loop_closed_ssa, to get non-single_dom_exit loops
exercising the code, and fix what breaks.
Hmm, I just realised, it's more complicated than I thought.
In loops with single_dom_exit, the exit dominates the uses outside the
loop, so I can replace the uses of the def with the uses of the exit phi
result.
If !single_dom_exit, the exit(s) may not dominate all uses, and I need
to insert non-loop-exit phi nodes to deal with that.
Thanks,
- Tom
