#9374: Investigate Static Argument Transformation -------------------------------------+------------------------------------- Reporter: jstolarek | Owner: Type: task | Status: new Priority: lowest | Milestone: Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:10 simonpj]:
I can't tell without a concrete example. Can you offer one? Thanks.
Simon
Not yet. Dan Doel's work on Takano Akio's `foldrW/buildW` fusion stuff (with some help from me) shows that it often creates static arguments. It also sometimes leads to apparently-splittable `Rec` groups. I have not ''yet'' seen it create a splittable `Rec` group in which it introduces a static argument. We still don't know if this fusion framework is viable as a replacement for classic `foldr/build`, but it seems likely that giving it a really fair performance test would require a late SAT run of some kind. It may be that there won't be splittable-`Rec` issues, but I figured I'd mention that possibility. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9374#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler