#12984: Missed constant folding oportunities (associativity) -------------------------------------+------------------------------------- Reporter: hsyl20 | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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): Ideally, express it as a bunch of rewrite rules (`prelude/PrelRules.hs`). I don't know if that is conveniently possible for assoc/distrib laws. Don't forget to take care about overflow etc. You will know this better than I but computer arithmetic doesn't obey all the same laws as mathematics! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12984#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler