[Bug tree-optimization/77893] New: VRP simplify_bit_ops_using_ranges should be applied during propagation

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77893

            Bug ID: 77893
           Summary: VRP simplify_bit_ops_using_ranges should be applied
                    during propagation
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: easyhack, missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

A redundant

 _3 = _2 & _1;

that is replaced by _3 = _2; should instead produce a [_2, _2] range for _3
during propagation.