On Wed, Apr 24, 2013 at 3:25 PM, Andreas Krebbel <kreb...@linux.vnet.ibm.com> wrote: > On 23/04/13 17:19, Florian Weimer wrote: >> On 04/23/2013 04:45 PM, Andreas Krebbel wrote: >>> I was not able to reproduce the problem with head GCC. But I couldn't >>> find anything which addresses the problem either. So I assume that a >>> different situation before the scheduling pass hides the problem. >> >> The fix for PR56982 might address this one in a reliable fashion, too. >> > Thanks for the pointer. This definitely goes into the right direction. But > unfortunately it > appears to only address the tree side. The abnormal edges added with the > patch do not survive in > the RTL CFG. So perhaps a similiar change is needed for the RTL cfg hooks as > well?
I expected we preserve edges across RTL expansion? We cannot re-create them optimally from scratch, but yes, re-construction is possible. Can you open a bugreport pointing out the missing RTL bits? Richard. > -Andreas- >
