Extend tree-call-cdce to calls whose result is used
Mon Nov 16 16:19:00 GMT 2015
On Mon, 16 Nov 2015, Richard Biener wrote:
> >> Which would leave us with a lowering stage early in the main
> >> optimization pipeline - I think fold_builtins pass is way too late
> >> but any "folding" pass will do (like forwprop or backprop where the
> >> latter might be better because it might end up computing FP "ranges"
> >> to improve the initial lowering code).
> > This isn't at all related to what backprop is doing though. backprop
> > is about optimising definitions based on information about all uses.
Right, I think backprop would be even worse than call_cdce, that pass has
a completely different structure.
> >> Of course call_cdce is as good as long as it still exists.
> > Does this meann that you're not against the patch in principle (i.e.
> > keeping call_cdce for now and extending it in the way that this patch
> > does)?
> Yes, I'm fine with extending call_cdce. Of course I'd happily approve a
> patch dissolving it into somewhere where it makes more sense. But this
> shouldn't block this patch.
Okay, I like merging passes, so I'll try to do that, once the stuff is in
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