#3744: Comparisons against minBound/maxBound not optimised for (Int|Word)(8|16|32) -------------------------------------+------------------------------------- Reporter: rl | Owner: Type: feature | Status: new request | Milestone: 7.10.1 Priority: low | Version: 6.13 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * difficulty: => Unknown * type: bug => feature request Comment: Status: see comment:12. Use program from comment:5 to test, and replace `Int` by `Int8` (`Int64` works since 7.4). For reference: commit d4781f3e6e8cead1cbeac5337f9f78440c8df8bc {{{ Author: Michal Terepeta <> Date: Wed Oct 27 18:40:54 2010 +0000 Optimise comparisons against min/maxBound (ticket #3744). This optimises away comparisons with minBound or maxBound that are always false or always true. }}} commit fe5821233d439c35c441cfc6c9d2029e5fd01342 {{{ Author: Ian Lynagh <> Date: Wed Sep 19 22:37:01 2012 +0100 Make some uses of minBound/maxBound use the target Int/Word sizes }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3744#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler