But what is so special about this case that makes this a worthwhile
#10012: Cheap-to-compute values aren't pushed into case branches inducing unnecessary register pressure -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Resolution: | Keywords: 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 bgamari): thing here, and not in other cases (sic)? Maybe the heuristics can be improved in general? I'd also like to point out that we already decide to inline the `BuildStep` `k` itself into `ensureRoom/step` (although I admittedly don't yet understand why). It seems odd that we would inline this yet not its free variables. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10012#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler