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  • Glasgow Haskell Compiler
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  • #15069
Closed
Open
Created Apr 20, 2018 by Simon Peyton Jones@simonpjDeveloper

Missed SpecConstr opportunity

If you look at the final Core for Csg.calc in nofib/real/fulsom you'll see missed opportunities for SpecConstr.

It has nested join points which look like this:

 join j (x :: Double) = Board (case x of { D# y -> ... })
                              ...
 in ....(j (D# v))....

So the call to $j$ ends up with an explicit (D# v) argument, and SpecConstr should catch it. But alas it does not because this happends nestedly, and SpecConstr is worried about exponential blowup.

Trac metadata
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Version 8.2.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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