{-# OPTIONS -fno-implicit-prelude #-}
-----------------------------------------------------------------------------
---
+-- |
-- Module : Data.Bits
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/core/LICENSE)
-- Stability : experimental
-- Portability : portable
--
--- $Id: Bits.hs,v 1.2 2001/07/03 11:37:49 simonmar Exp $
---
-- Bitwise operations.
--
-----------------------------------------------------------------------------
-- Removing all fixities is a fairly safe fix; fixing the "one fixity
-- per symbol per program" limitation in Hugs would take a lot longer.
#ifndef __HUGS__
-infixl 8 `shift`, `rotate`
+infixl 8 `shift`, `rotate`, `shiftL`, `shiftR`, `rotateL`, `rotateR`
infixl 7 .&.
infixl 6 `xor`
infixl 5 .|.
| i# >=# 0# = I# (x# `iShiftL#` i#)
| otherwise = I# (x# `iShiftRA#` negateInt# i#)
(I# x#) `rotate` (I# i#) =
-#if WORD_SIZE_IN_BYTES == 4
- I# (word2Int# ((x'# `shiftL#` i'#) `or#`
- (x'# `shiftRL#` (32# -# i'#))))
- where
- x'# = int2Word# x#
- i'# = word2Int# (int2Word# i# `and#` int2Word# 31#)
-#else
I# (word2Int# ((x'# `shiftL#` i'#) `or#`
- (x'# `shiftRL#` (64# -# i'#))))
+ (x'# `shiftRL#` (wsib -# i'#))))
where
x'# = int2Word# x#
- i'# = word2Int# (int2Word# i# `and#` int2Word# 63#)
-#endif
- bitSize _ = WORD_SIZE_IN_BYTES * 8
+ i'# = word2Int# (int2Word# i# `and#` int2Word# (wsib -# 1#))
+ wsib = WORD_SIZE_IN_BITS# {- work around preprocessor problem (??) -}
+ bitSize _ = WORD_SIZE_IN_BITS
isSigned _ = True
instance Bits Integer where