If I understand correctly, the LNE-detection in CoreToSTG makes all of the
decisions; it's the only place that the StgLetNoEscape constructor arises.
Join-points are only implemented as LNE if they are detected to be LNE,
which they most often — but not always! — after all the core2core
simplification are.
I have seen let-bindings with no parameters be detected as LNE.
HTH
On Wed, Oct 16, 2013 at 11:27 AM, Jan Stolarek
Hi all,
I'm trying to understand this:
1. Note [What is a non-escaping let] says that one of conditions of binding being a non-escaping let is non-updatability. 2. My understanding is that a if a binding has at least one parameter it is non-updatable, though I suspect that converse does not have to be true (lambdas) 3. Join-points are implemented using LNE bindings and I can imagine a join-points not having any parameters (and not being a lambda).
Three points above seem inconsistent - where does my reasoning go wrong? I suspect that the Note might be wrong and an updatable binding can in fact be a LNE binding.
Janek _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs