https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97000
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Meh, this way of forcing UNIQUE last to speedup lookup is a hack ... but yes,
your patch from comment#7 looks OK if you add
/* IFN_UNIQUE should be the last insn, to make checking for it
as cheap as possible. */
before the new check to say what this is about. Note this will re-introduce
the issue that passes cannot insert on loop entry edge without creating new BBs
even if we forced preheaders to be created. For some very special case, when
UNIQUE is involved. Thus we'll likely have even more hard to trigger latent
bugs (before it was also former setjmp calls).
