On Sun, Mar 8, 2015 at 8:49 PM, Jeff Law <l...@redhat.com> wrote: > On 03/08/15 12:13, Richard Biener wrote: >> >> >> I see. This basically creates two loop latches and thus will make our >> loop detection code turn the loop into a fake loop nest. Not sure if that >> is a good idea. > > I'd have to sit down and ponder this for a while -- what would be the > register pressure implications of duplicating the contents of the join block > into its predecessors, leaving an empty joiner so that we still have a > single latch?
Good question. Now another question is why we don't choose this way to disambiguate loops with multiple latches? (create a forwarder as new single latch block) Richard. > Jeff
