[Bug tree-optimization/67945] [6 Regression] Testsuite failures starting with revision 228616

["rsandifo at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67945

--- Comment #10 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> I wonder if we should have two "phases" of simplifications, first
> aggressively canonicalize and later apply the optimizations.  We could
> key this on a new GIMPLE state, PROP_gimple_XXX (can't figure out a good
> acronym) and key patterns with it (like we have reload_completed on RTL).
> The pass deciding it's time to "lower" stuff (rather than canonicalize)
> would be cse_sincos (the pass doing the transform required
> for the testcase).  Note that some patters in that pass might be moved
> to match.pd instead so we can key PROP_gimple_XXX on the forwprop pass
> preceeding cse_sincos (so we can transform all stmts at once).

OK, thanks for the pointer.  I'm giving that a go now.