[GHC] #9872: Runing type functions is too slow
GHC
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Mon Dec 8 12:38:05 UTC 2014
#9872: Runing type functions is too slow
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Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.8.3
Resolution: | Keywords:
Operating System: | Architecture: Unknown/Multiple
Unknown/Multiple | Difficulty: Unknown
Type of failure: | Blocked By:
None/Unknown | Related Tickets:
Test Case: |
Blocking: |
Differential Revisions: |
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Comment (by goldfire):
This all begs a question I've wondered several times: Flattening in the
solver is great when we have bits of a type that are unknown, like `F
(Int, a)`. But, it seems like an awful lot of work to do when a type is
fully known, such as `F Bool`. In the latter case, is there a reason we
don't use `normaliseType`? It would seem to me that this all would get
more efficient if we just called `normaliseType` as an early step in the
process, say in `flattenFamApp`.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9872#comment:3>
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