[Bug middle-end/71232] New: [7 Regression] FAIL gnat.dg/vect[36].adb scan-tree-dump-times vect "vectorized 1 loops" 15

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71232

            Bug ID: 71232
           Summary: [7 Regression] FAIL gnat.dg/vect[36].adb
                    scan-tree-dump-times vect "vectorized 1 loops" 15
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                CC: ebotcazou at gcc dot gnu.org, hubicka at gcc dot gnu.org
  Target Milestone: ---

I am seeing

Running target unix/
FAIL: gnat.dg/vect3.adb scan-tree-dump-times vect "vectorized 1 loops" 15
FAIL: gnat.dg/vect6.adb scan-tree-dump-times vect "vectorized 1 loops" 15

looking into the dumps this is caused by loop trip estimate changes.

Not sure if the testcases are really having too low loop trip count or the
change is causing a real-life regression (likely).