#1168: nofib/spectral/calendar is mis-optimised
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Reporter: simonmar | Owner:
Type: bug | Status: new
Priority: normal | Milestone: _|_
Component: Compiler | Version: 6.6
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: nofib/spectral/calendar | Architecture: Unknown
Os: Unknown |
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Changes (by simonmar):
* milestone: 6.6.2 => _|_
Comment:
I don't think we're going to fix this any time soon. The simplifier is
eta-expanding `State#` lambdas on purpose, because it's often critical for
good performance of IO code, but it does risk re-computation in some
cases, and this is one of those cases. Leaving the bug open because it is
a real bug, someday we might implement something a bit more refined (e.g.
arity analysis).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1168#comment:1>
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