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| author | Simon Peyton Jones <simonpj@microsoft.com> | 2014-05-12 10:53:09 +0100 |
|---|---|---|
| committer | Simon Peyton Jones <simonpj@microsoft.com> | 2014-08-28 11:14:09 +0100 |
| commit | 4c03791f986509c5d95adf50de555876ed05522e (patch) | |
| tree | 00ce8214b4094dde855ae01d4279bc680dc0a8b2 /libraries | |
| parent | 9cf5906b692c31b7ec67856b0859cb0e33770651 (diff) | |
| download | haskell-4c03791f986509c5d95adf50de555876ed05522e.tar.gz | |
Specialise Eq, Ord, Read, Show at Int, Char, String
These instances are quite common, so it's good to have
pre-specialised versions available
Diffstat (limited to 'libraries')
| -rw-r--r-- | libraries/base/GHC/Read.lhs | 3 | ||||
| -rw-r--r-- | libraries/base/GHC/Show.lhs | 5 | ||||
| -rw-r--r-- | libraries/ghc-prim/GHC/Classes.hs | 4 |
3 files changed, 11 insertions, 1 deletions
diff --git a/libraries/base/GHC/Read.lhs b/libraries/base/GHC/Read.lhs index ab730e6652..2fd9f305b6 100644 --- a/libraries/base/GHC/Read.lhs +++ b/libraries/base/GHC/Read.lhs @@ -423,6 +423,9 @@ instance Read a => Read (Maybe a) where readList = readListDefault instance Read a => Read [a] where + {-# SPECIALISE instance Read [String] #-} + {-# SPECIALISE instance Read [Char] #-} + {-# SPECIALISE instance Read [Int] #-} readPrec = readListPrec readListPrec = readListPrecDefault readList = readListDefault diff --git a/libraries/base/GHC/Show.lhs b/libraries/base/GHC/Show.lhs index 45338e8845..09c3c56cd9 100644 --- a/libraries/base/GHC/Show.lhs +++ b/libraries/base/GHC/Show.lhs @@ -184,7 +184,10 @@ instance Show () where showsPrec _ () = showString "()" instance Show a => Show [a] where - showsPrec _ = showList + {-# SPECIALISE instance Show [String] #-} + {-# SPECIALISE instance Show [Char] #-} + {-# SPECIALISE instance Show [Int] #-} + showsPrec _ = showList instance Show Bool where showsPrec _ True = showString "True" diff --git a/libraries/ghc-prim/GHC/Classes.hs b/libraries/ghc-prim/GHC/Classes.hs index 5bb4cb681c..9028f6edcd 100644 --- a/libraries/ghc-prim/GHC/Classes.hs +++ b/libraries/ghc-prim/GHC/Classes.hs @@ -83,7 +83,9 @@ deriving instance (Eq a, Eq b, Eq c, Eq d, Eq e, Eq f, Eq g, => Eq (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) instance (Eq a) => Eq [a] where + {-# SPECIALISE instance Eq [[Char]] #-} {-# SPECIALISE instance Eq [Char] #-} + {-# SPECIALISE instance Eq [Int] #-} [] == [] = True (x:xs) == (y:ys) = x == y && xs == ys _xs == _ys = False @@ -181,7 +183,9 @@ deriving instance (Ord a, Ord b, Ord c, Ord d, Ord e, Ord f, Ord g, => Ord (a, b, c, d, e, f, g, h, i, j, k, l, m, n, o) instance (Ord a) => Ord [a] where + {-# SPECIALISE instance Ord [[Char]] #-} {-# SPECIALISE instance Ord [Char] #-} + {-# SPECIALISE instance Ord [Int] #-} compare [] [] = EQ compare [] (_:_) = LT compare (_:_) [] = GT |