#11393: Ability to define INLINE pragma for all instances of a given typeclass -------------------------------------+------------------------------------- Reporter: danilo2 | Owner: Type: feature | Status: new request | Priority: normal | Milestone: Component: Compiler | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Hello! I would like to request a feature that would allow me to define the `INLINE` pragma for all instances of a given type class. Currently when we are creating high-performance libraries, that strongly depend on type- level computations we are using a lot of typeclasses that we want to be cut-out during the compilation time. We can use the `INLINE` pragma to be sure that after type-class resolution the code will be inlined and hopefully strongly optimized, but we have to put the pragme in every single type class instance, which makes the code look ugly and is just impractival. So I would like to transform code like (this is just example, not a real-world problem solving code): {{{ class Foo a b where foo :: a -> b instance Foo Int String where foo = show {-# INLINE foo #-} instance Foo Int Int where foo = id {-# INLINE foo #-} instance Foo Int Float where foo = fromIntegral {-# INLINE foo #-} }}} into: {{{ class Foo a b where foo :: a -> b {-# INLINE foo #-} instance Foo Int String where foo = show instance Foo Int Int where foo = id instance Foo Int Float where foo = fromIntegral }}} I think it would be pretty easy to support such syntax and a lot of libraries would benefit from the design. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11393 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler