#15164: Slowdown in ghc compile times from GHC 8.0.2 to GHC 8.2.1 when doing Called arity analysis -------------------------------------+------------------------------------- Reporter: flip101 | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): We already go from {{{ ==================== Desugar (after optimization) ==================== Result size of Desugar (after optimization) = {terms: 3,189, types: 4,403, coercions: 132} }}} to {{{ ==================== Desugar (after optimization) ==================== Result size of Desugar (after optimization) = {terms: 82,881, types: 86,775, coercions: 132, joins: 0/20,633} }}} Maybe the use of `UndecidableInstances` is the problem here? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15164#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler