Hello,
In another thread[1], I proposed $SUBJECT, but then we found a better
solution to that thread's specific problem. The general idea is still
good though: it's possible to (1) replace several existing copies of
our qsort algorithm with one, and (2) make new specialised versions a
bit more easily than the existing Perl generator allows. So, I'm back
with a rebased stack of patches. I'll leave specific cases for new
worthwhile specialisations for separate proposals; I've heard about
several.
[1] https://www.postgresql.org/message-id/flat/CA%2BhUKGKMQFVpjr106gRhwk6R-nXv0qOcTreZuQzxgpHESAL6dw%40mail.gmail.com