#4945: Another SpecConstr infelicity
---------------------------------+------------------------------------------
Reporter: batterseapower | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Runtime performance bug
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Comment(by batterseapower):
I see what is going on here. Since this is a local letrec, you don't
generate any specialisations from the RHS call patterns unless at least
one call pattern is boring. However, since the body doesn't apply *any*
arguments at all to the function, SpecConstr doesn't detect any calls! How
amusing :-)
A quick and easy hack that would probably solve it would be to replace
SpecConstr:1486 with:
{{{
any isNothing mb_pats || null mb_pats
}}}
I can't test this right now.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4945#comment:1>
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