[Bug target/106222] New: x86 Better code squence for __builtin_shuffle

[admin at levyhsu dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106222

            Bug ID: 106222
           Summary: x86 Better code squence for __builtin_shuffle
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: admin at levyhsu dot com
  Target Milestone: ---

Related bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54346

After I merge two VEC_PERM_EXPR in the match.pd, I found that two
__builtin_shuffle actually generate better code than one __builtin_shuffle:

https://godbolt.org/z/xE9xd9ExT