[Bug libstdc++/114958] New: use __builtin_shufflevector for std::experimental::simd split and concat (at least the common cases) to enable better optimizations

[mkretz at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114958

            Bug ID: 114958
           Summary: use __builtin_shufflevector for
                    std::experimental::simd split and concat (at least the
                    common cases) to enable better optimizations
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: mkretz at gcc dot gnu.org
          Reporter: mkretz at gcc dot gnu.org
  Target Milestone: ---

PR114908 presents a missed optimization that would not occur if simd's split
and concat would make better use of __builtin_shufflevector.