#9630: compile-time performance regression (probably due to Generics) -------------------------------------+------------------------------------- Reporter: hvr | Owner: simonpj Type: bug | Status: new Priority: high | Milestone: 7.12.1 Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #9583 | Differential Revisions: -------------------------------------+------------------------------------- Comment (by simonpj): I would love for someone to investigate this: * What exactly is happening? * Is it due to over-aggressive inlining in the `binary`? comment:7 suggests that might be so * Are there underlying issues in GHC itself? comment:10 suggests so. * If so, is the issue only that GHC is specialising too much? Or is it doing so uselessly or redundantly? And is it doing so by itself, or in response to user pragmas? * Even if GHC is behaving precisely as advertised, what should we do to stop this kind of code blow-up happening, or tell the user that it is happening, and give some clue about what to do? We are a bit stuck here until someone has the time and motivation to get some data. Thanks Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9630#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler