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Re: [tree-ssa] Loop header copying on trees
> > The jump threading on tree-ssa does this kind of loop header copying
> >already, so I assume it might no longer be true (although I haven't
> >tested it).
> Yes, we get a certain amount of virtual header copying via jump threading.
> It would certainly be interesting to see if loop header copying at the
> tree level generally makes things larger or smaller so that we could
> make an informed decision :-)
on gcc from specint benchmark:
-O2 -ftree-ch: 1447502
-O2 -fno-tree-ch: 1429678
-Os -ftree-ch: 1175935
-Os -fno-tree-ch: 1160095