#9781: Make list monad operations fuse -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: dfeuer Type: task | Status: closed Priority: normal | Milestone: 7.10.1 Component: Core | Version: 7.9 Libraries | Keywords: Resolution: fixed | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: Phab:D455 | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:5 nomeata]:
This showed some minor performance improvements, and one huge one, as you noticed already: cryptarithm2’s allocation went down by more than 50%!
(I just spent a few minutes looking for list monad operations in that benchmark until I noticed that your commit also had an unrelated(?) change to mapM.)
The change also improves cryptarithm2 without the `mapM` change, but not as much. So there must have been something else. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9781#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler