#13014: Seemingly unnecessary marking of a SpecConstr specialization as a loopbreaker -------------------------------------+------------------------------------- Reporter: nfrisby | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: SpecConstr Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nfrisby): I've attached three `hs` files as `T13014.tar.gz`. They demonstrate the issue when they're all compiled with `-O`. (The second module specifies `OPTIONS_GHC -fspec-constr`.) The characteristic of this ticket is that the `-ddump-simpl` for the `GADTSpecConstr3.hs` module does not define `test` as simply `3`. Embarassingly and frustratingly, I've lost the `VLZ` rule with my interim edits and I can't get it back. Thankfully, it's not actually necessary for this ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13014#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler