[Bug tree-optimization/69783] New: [6 Regression] Loop is not vectorized after r233212

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69783

            Bug ID: 69783
           Summary: [6 Regression] Loop is not vectorized after r233212
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysrumyan at gmail dot com
  Target Milestone: ---

After changes in vect_prune_runtime_alias_test_list() a number of merging
ranges was significantly decreased:

  Before fix
improved number of alias checks from 50 to 3
  After fix
improved number of alias checks from 50 to 22
and loop is not vectorized since
number of versioning for alias run-time tests exceeds 10