#10980: Deriving Read instance from datatype with N fields leads to N^2 code size growth -------------------------------------+------------------------------------- Reporter: slyfox | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Slyfox, can you give a small example of what the code looks like before and after your change? I can see that turning 4 lines into 1 (by creating a new function definition) is good, but at best that makes it 4 times smaller, which is not the difference between linear and quadratic. I'd like to understand where the quadratic-ness is coming from! Thanks for investigating this. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10980#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler