https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82676

            Bug ID: 82676
           Summary: GRAPHITE doesn't handle niter with may_be_zero
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
            Blocks: 59859
  Target Milestone: ---

$summary.  It should use number_of_iterations_exit and only reject assumptions
(even that could go into a versioning condition).  may_be_zero can be added
as an additional constraint on the domain.

Needs some refactoring for handling of condition / constraint generation for
conditions.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59859
[Bug 59859] [meta-bug] GRAPHITE issues

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