#2439: Missed optimisation with dictionaries and loops
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Reporter: rl | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.9
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown
Os: Unknown |
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Changes (by simonpj):
* difficulty: => Unknown
Comment:
Interesting example. I've thought about it a bit, and I don't see an
obvious, general transformation that would help. The loop ''is not''
strict in the dictionary; it's just this particular call that is.
A long-standing thing I've wanted to try is to make ''all'' dictionary
arguments strict, and see where that takes us. After all, evaluating a
dictionary should always terminate. I'll leave this ticket open to help
me remember to try that.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2439#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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