#7803: Superclass methods are left unspecialized -------------------------------------+------------------------------------- Reporter: akio | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Here is a nofib comparison based on 38af3d1db2889423a12a2232b9d52181bba23d75 with and without the following patch, {{{#!patch diff --git a/compiler/simplCore/SimplCore.hs b/compiler/simplCore/SimplCore.hs index 6badbf8..c573b45 100644 --- a/compiler/simplCore/SimplCore.hs +++ b/compiler/simplCore/SimplCore.hs @@ -182,7 +182,7 @@ getCoreToDo dflags (base_mode { sm_phase = InitialPhase , sm_names = ["Gentle"] , sm_rules = rules_on -- Note [RULEs enabled in SimplGently] - , sm_inline = False + , sm_inline = True , sm_case_case = False }) -- Don't do case-of-case transformations. -- This makes full laziness work better }}} Unfortunately things don't look terribly promising, {{{ Program Size Allocs Runtime Elapsed TotalMem -------------------------------------------------------------------------------- Min -0.3% -95.0% -0.6% -1.2% 0.0% Max +0.9% +10.6% +14.3% +14.3% +100.0% Geometric Mean +0.4% -2.8% +1.6% +1.5% +0.8% }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7803#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler