[Bug rtl-optimization/40209] ICE in iv_analyze_def caused by stale REG_UNUSED note

[steven at gcc dot gnu dot org]

------- Comment #4 from steven at gcc dot gnu dot org  2009-07-24 06:27 -------
A hint, please, about why the patch of comment #2 would be the correct fix.  As
far as I can tell, loop-iv doesn't need the notes and shouldn't have to clean
up other passes' mess. This patch also introduces a pass ordering restriction
that shouldn't be there. And at the very least, if this bug gets papered over
like this, then there should be a comment in loop-iv that the problem is only
added to fix bugs elsewhere...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40209