#14944: Compile speed regression -------------------------------------+------------------------------------- Reporter: br1 | Owner: dfeuer Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.4.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): In case this helps any, the simplifier runs iteration 1,2,1,2,3,1,2,3, and then the next iteration (1) is the one that blows up the term count in 8.4.1. It appears that the blow-up is non-linear. When I increase the number of lines in the `Main.hs` source, the ratio of terms in that iteration to terms in the previous one increases. Similarly, the ratio of time and allocation in that simplifier run compared to the previous one increases. I've tried looking at a very cut-down version with `-ddump- simpl-iterations`, but there are still an awful lot of terms to look at. I'll keep at it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14944#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler