[Bug tree-optimization/100457] New: [meta bug] Enabling O2 vectorization in GCC 12

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100457

            Bug ID: 100457
           Summary: [meta bug] Enabling O2 vectorization in GCC 12
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: crazylht at gmail dot com
                CC: hjl.tools at gmail dot com
  Target Milestone: ---

This metabug is used to track all the O2 vectorization issues.

We're trying to enable vectorization in O2 for GCC12. To do that, we need to
make  there's no regression comparing -O2 -ftree-vectorize
-fvect-cost-model=very-cheap to plain -O2, or those regressions are acceptable.