#1117: [2,4..10] is not a good list producer
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Reporter: [EMAIL PROTECTED] | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.6
Severity: normal | Resolution:
Keywords: rewrite rules | Difficulty: Easy (1 hr)
Testcase: | Architecture: Multiple
Os: Multiple |
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Comment (by [EMAIL PROTECTED]):
The function that should be changed is efdtInt in
http://darcs.haskell.org/packages/base/GHC/Enum.lhs
The comments acknowledge that it doesn't bother with rules and
deforestation.
The code that brings this up is a step on the imperative eratosthenes
sieve algorithm:
forM_ [2*i, 3*i .. n-1] (\j -> writeArray arr j False)
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1117>
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