#7436: Derived Foldable and Traversable instances become extremely inefficient
due
to eta-expansion
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Reporter: shachaf | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Runtime performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj):
Thanks for the simple version. Truly bizarre. The slow code allocate
ONLY 11 MBYTE, and yet takes EIGHT SECONDS to run. No time to look today,
but if anyone cares to investigate that'd be great. (One thing to try
would be profiling, though that might make the bug disappear.)
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7436#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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