#13566: Bigger core size in ghc8 compared to ghc7 -------------------------------------+------------------------------------- Reporter: pacak | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1-rc2 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: -------------------------------------+------------------------------------- Generated core size (as reported by ghc -v) is much bigger in ghc 8.0.2 compared to ghc 7.10.1. Things are slightly better in ghc 8.2.0rc2, but not as good as in ghc7 I think that results in a slight runtime performance problem. steps to reproduce: ghc -O A.hs {{{ Result size of CorePrep = {terms: 5,016, types: 9,813, coercions: 1,443} -- ghc8 Result size of CorePrep = {terms: 975, types: 2,375, coercions: 150} -- ghc7 Result size of CorePrep = {terms: 1,342, types: 2,838, coercions: 320, joins: 0/66} -- ghc8.2 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13566 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler