diff options
Diffstat (limited to 'libraries/base/GHC/Word.hs')
| -rw-r--r-- | libraries/base/GHC/Word.hs | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/libraries/base/GHC/Word.hs b/libraries/base/GHC/Word.hs index be1921df05..408dede2d3 100644 --- a/libraries/base/GHC/Word.hs +++ b/libraries/base/GHC/Word.hs @@ -730,6 +730,7 @@ instance Enum Word64 where | x <= fromIntegral (maxBound::Int) = I# (word2Int# (word64ToWord# x#)) | otherwise = fromEnumError "Word64" x +#if WORD_SIZE_IN_BITS < 64 -- See Note [Stable Unfolding for list producers] in GHC.Enum {-# INLINE enumFrom #-} enumFrom = integralEnumFrom @@ -742,6 +743,24 @@ instance Enum Word64 where -- See Note [Stable Unfolding for list producers] in GHC.Enum {-# INLINE enumFromThenTo #-} enumFromThenTo = integralEnumFromThenTo +#else + -- use Word's Enum as it has better support for fusion. We can't use + -- `boundedEnumFrom` and `boundedEnumFromThen` -- which use Int's Enum + -- instance -- because Word64 isn't compatible with Int/Int64's domain. + -- + -- See Note [Stable Unfolding for list producers] in GHC.Enum + {-# INLINE enumFrom #-} + enumFrom x = map fromIntegral (enumFrom (fromIntegral x :: Word)) + -- See Note [Stable Unfolding for list producers] in GHC.Enum + {-# INLINE enumFromThen #-} + enumFromThen x y = map fromIntegral (enumFromThen (fromIntegral x :: Word) (fromIntegral y)) + -- See Note [Stable Unfolding for list producers] in GHC.Enum + {-# INLINE enumFromTo #-} + enumFromTo x y = map fromIntegral (enumFromTo (fromIntegral x :: Word) (fromIntegral y)) + -- See Note [Stable Unfolding for list producers] in GHC.Enum + {-# INLINE enumFromThenTo #-} + enumFromThenTo x y z = map fromIntegral (enumFromThenTo (fromIntegral x :: Word) (fromIntegral y) (fromIntegral z)) +#endif -- | @since 2.01 instance Integral Word64 where |