[Bug tree-optimization/68417] New: [6 Regression] Missed vectorization opportunity when setting struct field

[afomin.mailbox at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68417

            Bug ID: 68417
           Summary: [6 Regression] Missed vectorization opportunity when
                    setting struct field
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: afomin.mailbox at gmail dot com
                CC: izamyatin at gmail dot com,
                    venkataramanan.kumar.gnu at gmail dot com, ysrumyan at 
gmail dot com
  Target Milestone: ---
            Target: i686-*-*

Created attachment 36763
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36763&action=edit
A reproducer

A loop in the test attached compiled with -m32 -msse4.2 -O2 -ftree-vectorize is
no more vectorized after r230454(while on r223524.