[Bug target/103269] New: Enable ZMM in MOVE_MAX and STORE_MAX_PIECES without -mprefer-vector-width=512

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103269

            Bug ID: 103269
           Summary: Enable ZMM in MOVE_MAX and STORE_MAX_PIECES without
                    -mprefer-vector-width=512
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: crazylht at gmail dot com, wwwhhhyyy333 at gmail dot com
  Target Milestone: ---
            Target: i386,x86-64

Need a way to enable ZMM in MOVE_MAX and STORE_MAX_PIECES without
-mprefer-vector-width=512.