#4941: SpecConstr generates functions that do not use their arguments
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Reporter: simonpj | Owner:
Type: task | Status: new
Priority: normal | Milestone: _|_
Component: Compiler | Version: 7.0.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Runtime performance bug
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Comment(by batterseapower):
I'm being particularly slow today. The issue was obvious once I looked at
the simplified output rather than the tidied core - there is a non-dead
function later in that letrec (go_s1gC) that has a RULE that rewrites to
$sgo_s1lg.
It is sort of unfortunate that this is keeping the thing it refers to
alive even after core tidying, where rules cannot possibly apply any more.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4941#comment:12>
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