#9132: takeWhile&C. still not fusible -------------------------------------+------------------------------------- Reporter: Blaisorblade | Owner: skeuchel Type: bug | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.8.2 Resolution: | Keywords: fusion Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: Runtime | Difficulty: Moderate (less performance bug | than a day) Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------- Comment (by Blaisorblade): Replying to [comment:7 skeuchel]: my progress is in this branch: https://github.com/Blaisorblade/ghc/tree/topic/fuseTakeWhile (see https://github.com/Blaisorblade/ghc/pull/1 for a better web interface), and include some doc changes. Since you assigned the bug to yourself (so I guess you plan to work on it), you might want to resume from there. Current status: the changes are done and do work on my example (causing fusion), now one should validate the performance impacts. Right now, I didn't write a benchmark to measure the speedup on my program (or any other), and there's no net effect on nofib (even though takeWhile is sometimes called — but probably not in inner loops). The automated tests are also missing. (Sorry for not getting back to you before, I'm traveling lots this month — next week I'm at PLDI). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9132#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler