-{-# OPTIONS_GHC -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -XNoImplicitPrelude #-}
-----------------------------------------------------------------------------
-- |
-- Module : Data.Bits
question. -}
shift :: a -> Int -> a
- x `shift` i | i<0 = x `shiftR` (-i)
- | i==0 = x
- | i>0 = x `shiftL` i
+ x `shift` i | i<0 = x `shiftR` (-i)
+ | i>0 = x `shiftL` i
+ | otherwise = x
{-| @'rotate' x i@ rotates @x@ left by @i@ bits if @i@ is positive,
or right by @-i@ bits otherwise.
question. -}
rotate :: a -> Int -> a
- x `rotate` i | i<0 = x `rotateR` (-i)
- | i==0 = x
- | i>0 = x `rotateL` i
+ x `rotate` i | i<0 = x `rotateR` (-i)
+ | i>0 = x `rotateL` i
+ | otherwise = x
{-
-- Rotation can be implemented in terms of two shifts, but care is
i'# = word2Int# (int2Word# i# `and#` int2Word# (wsib -# 1#))
wsib = WORD_SIZE_IN_BITS# {- work around preprocessor problem (??) -}
bitSize _ = WORD_SIZE_IN_BITS
+
+ {-# INLINE shiftR #-}
+ -- same as the default definition, but we want it inlined (#2376)
+ x `shiftR` i = x `shift` (-i)
#else /* !__GLASGOW_HASKELL__ */
#ifdef __HUGS__