#14672: Make likelyhood of branches/conditions available throughout the compiler. -------------------------------------+------------------------------------- Reporter: AndreasK | Owner: (none) Type: task | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: CodeGen Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #849 #15124 | Differential Rev(s): Phab:D4316 Wiki Page: | Phab:D4324 Phab:D4327 -------------------------------------+------------------------------------- Comment (by AndreasK): Doing this right might also help with performance being dependant on the syntactic order of Constructors in the end. For example containers has this note in Data.IntSet.Internal {{{ -- [Note: Order of constructors] -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- The order of constructors of IntMap matters when considering performance. -- Currently in GHC 7.0, when type has 3 constructors, they are matched from -- the first to the last -- the best performance is achieved when the -- constructors are ordered by frequency. -- On GHC 7.0, reordering constructors from Nil | Tip | Bin to Bin | Tip | Nil -- improves the benchmark by circa 10%. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14672#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler