#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):
Roman: I was thinking about making stream fusion do concatMap properly. Of
course you can specialise on lambdas directly as an alternative.
Simon: I would prefer if you eliminated the box for e.g. y_smH, so y_smH
binds something of type Int# instead of Int. This would eliminate the
allocation and the unboxing in both branches. I don't think this requires
code duplication, unless I'm missing something?
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4941#comment:6>
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