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Re: pretty-ipa merge 17: CD-DCE wrt cyclic CFGs fix


> > 
> > I'm at the point now where I believe DCE and CD-DCE are getting so
> > complicated, that I would remove the CD-DCE bits completely again.
> > When I added then, the benefit was minimal but real.  By now, I wonder

Actually thinking about it, if cd-dce was added with the conditional in
question already there (i.e. without actual redirection to PHI
arguments), it would not do much of transformations dce+cfgcleanup can't
after iteration.

Just quick checking, disabling cd-dce on pretty ipa (with this patch in)
I get 5k increase of code size on tramp3d.  I tried to measure
compilation time difference, but it seems to be down in noise.

Honza


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