#9136: Constant folding in Core could be better --------------------------------------------+------------------------------ Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by nomeata): That reminded me of something, so I filed #9137. If we had that we could specify create RULES like {{{ forall x y z. (isLiteral y, isLiteral z) => (x +# y) -# z = x +# (y -# z) forall x y z. (isLiteral y, isLiteral z) => (x -# y) -# z = x -# (y +# z) ... }}} that would rewrite the terms to have the literals next to each other. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9136#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler