#4507: Data.List.sum and Data.List.product unnecessarily inefficient
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Reporter: pozorvlak | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: libraries/base | Version: 7.0.1
Resolution: wontfix | Keywords: Data.List, sum, product, foldl'
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: None/Unknown |
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Comment(by pozorvlak):
I am confused. The Haskell 2010 Language Report section on Data.List
(http://www.haskell.org/onlinereport/haskell2010/haskellch20.html#x28-23100020.3)
doesn't say anything about the strictness of sum or product that I can
see: the Haskell 1998 Report doesn't mention Data.List at all. Where
should I be looking? Note that I'm talking about the sum and product
defined in Data.List, not the ones in the Prelude.
[I tried again with -O, and performance was indeed similar. Thanks!]
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4507#comment:2>
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