[Haskell-cafe] force inlining in GHC

Henning Thielemann lemming at henning-thielemann.de
Tue Apr 29 06:01:39 EDT 2008

Whenever I try to inline a lot of nested function calls, GHC decides to 
specialise one of the functions and the specialised function is no longer 
inlined. I hoped to get the function inlined anyway by specialising it 
manually. Say, I want to inline genericFunc

{-# INLINE genericFunc #-}
genericFunc :: RealFrac a => a -> Int

but GHC inserts a call to genericFunc1 specialised to a=Double where I 
apply genericFunc to a Double argument.

Now I define

{-# INLINE doubleFunc #-}
doubleFunc :: Double -> Int
doubleFunc = genericFunc

However, in the Core output 'doubleFunc' does not get the __inline_me tag 
and thus will not be inlined, too. :-(

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