[GHC] #9781: Make list monad operations fuse
GHC
ghc-devs at haskell.org
Tue Nov 11 16:55:57 UTC 2014
#9781: Make list monad operations fuse
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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 |
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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>
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