[project @ 1996-07-01 09:16:34 by partain]

[ghc-hetmet.git] / ghc / lib / ghc / BitSet.lhs

diff --git a/ghc/lib/ghc/BitSet.lhs b/ghc/lib/ghc/BitSet.lhs
deleted file mode 100644 (file)
index eb6b523..0000000
--- a/ghc/lib/ghc/BitSet.lhs
+++ /dev/null
@@ -1,197 +0,0 @@
-%
-% (c) The GRASP Project, Glasgow University, 1994-1995
-%
-\section[BitSet]{An implementation of very small sets}
-
-Bit sets are a fast implementation of sets of integers ranging from 0
-to one less than the number of bits in a machine word (typically 31).
-If any element exceeds the maximum value for a particular machine
-architecture, the results of these operations are undefined.  You have
-been warned.  If you put any safety checks in this code, I will have
-to kill you.
-
-Note: the Yale Haskell implementation won't provide a full 32 bits.
-However, if you can handle the performance loss, you could change to
-Integer and get virtually unlimited sets.
-
-\begin{code}
-
-module BitSet (
-       BitSet,         -- abstract type
-       mkBS, listBS, emptyBS, singletonBS,
-       unionBS, minusBS
-#if ! defined(COMPILING_GHC)
-       , elementBS, intersectBS, isEmptyBS
-#endif
-    ) where
-
-#ifdef __GLASGOW_HASKELL__
--- nothing to import
-#elif defined(__YALE_HASKELL__)
-{-hide import from mkdependHS-}
-import
-        LogOpPrims
-#else
-{-hide import from mkdependHS-}
-import
-       Word
-#endif
-
-#ifdef __GLASGOW_HASKELL__
-
-data BitSet = MkBS Word#
-
-emptyBS :: BitSet 
-emptyBS = MkBS (int2Word# 0#)
-
-mkBS :: [Int] -> BitSet
-mkBS xs = foldr (unionBS . singletonBS) emptyBS xs
-
-singletonBS :: Int -> BitSet
-singletonBS x = case x of
-    I# i# -> MkBS ((int2Word# 1#) `shiftL#` i#)
-
-unionBS :: BitSet -> BitSet -> BitSet
-unionBS (MkBS x#) (MkBS y#) = MkBS (x# `or#` y#)
-
-minusBS :: BitSet -> BitSet -> BitSet
-minusBS (MkBS x#) (MkBS y#) = MkBS (x# `and#` (not# y#))
-
-#if ! defined(COMPILING_GHC)
--- not used in GHC
-isEmptyBS :: BitSet -> Bool
-isEmptyBS (MkBS s#) = 
-    case word2Int# s# of
-       0# -> True
-       _  -> False
-
-intersectBS :: BitSet -> BitSet -> BitSet
-intersectBS (MkBS x#) (MkBS y#) = MkBS (x# `and#` y#)
-
-elementBS :: Int -> BitSet -> Bool
-elementBS x (MkBS s#) = case x of
-    I# i# -> case word2Int# (((int2Word# 1#) `shiftL#` i#) `and#` s#) of
-                   0# -> False
-                   _  -> True
-#endif
-
-listBS :: BitSet -> [Int]
-listBS s = listify s 0
-    where listify (MkBS s#) n = 
-           case word2Int# s# of
-               0# -> []
-               _  -> let s' = (MkBS (s# `shiftr` 1#))
-                         more = listify s' (n + 1)
-                     in case word2Int# (s# `and#` (int2Word# 1#)) of
-                         0# -> more
-                         _  -> n : more
-# if __GLASGOW_HASKELL__ >= 23
-         shiftr x y = shiftRL# x y
-# else
-         shiftr x y = shiftR#  x y
-# endif
-
-#elif defined(__YALE_HASKELL__)
-
-data BitSet = MkBS Int
-
-emptyBS :: BitSet 
-emptyBS = MkBS 0
-
-mkBS :: [Int] -> BitSet
-mkBS xs = foldr (unionBS . singletonBS) emptyBS xs
-
-singletonBS :: Int -> BitSet
-singletonBS x = MkBS (1 `ashInt` x)
-
-unionBS :: BitSet -> BitSet -> BitSet
-unionBS (MkBS x) (MkBS y) = MkBS (x `logiorInt` y)
-
-#if ! defined(COMPILING_GHC)
--- not used in GHC
-isEmptyBS :: BitSet -> Bool
-isEmptyBS (MkBS s) = 
-    case s of
-       0 -> True
-       _ -> False
-
-intersectBS :: BitSet -> BitSet -> BitSet
-intersectBS (MkBS x) (MkBS y) = MkBS (x `logandInt` y)
-
-elementBS :: Int -> BitSet -> Bool
-elementBS x (MkBS s) = 
-    case logbitpInt x s of
-       0 -> False
-       _ -> True
-#endif
-
-minusBS :: BitSet -> BitSet -> BitSet
-minusBS (MkBS x) (MkBS y) = MkBS (x `logandc2Int` y)
-
--- rewritten to avoid right shifts (which would give nonsense on negative 
--- values.
-listBS :: BitSet -> [Int]
-listBS (MkBS s) = listify s 0 1
-    where listify s n m = 
-           case s of
-               0 -> []
-               _ -> let n' = n+1; m' = m+m in
-                     case logbitpInt s m of
-                    0 -> listify s n' m'
-                    _ -> n : listify (s `logandc2Int` m) n' m'
-
-#else  /* HBC, perhaps? */    
-
-data BitSet = MkBS Word
-
-emptyBS :: BitSet 
-emptyBS = MkBS 0
-
-mkBS :: [Int] -> BitSet
-mkBS xs = foldr (unionBS . singletonBS) emptyBS xs
-
-singletonBS :: Int -> BitSet
-singletonBS x = MkBS (1 `bitLsh` x)
-
-unionBS :: BitSet -> BitSet -> BitSet
-unionBS (MkBS x) (MkBS y) = MkBS (x `bitOr` y)
-
-#if ! defined(COMPILING_GHC)
--- not used in GHC
-isEmptyBS :: BitSet -> Bool
-isEmptyBS (MkBS s) = 
-    case s of
-       0 -> True
-       _ -> False
-
-intersectBS :: BitSet -> BitSet -> BitSet
-intersectBS (MkBS x) (MkBS y) = MkBS (x `bitAnd` y)
-
-elementBS :: Int -> BitSet -> Bool
-elementBS x (MkBS s) = 
-    case (1 `bitLsh` x) `bitAnd` s of
-       0 -> False
-       _ -> True
-#endif
-
-minusBS :: BitSet -> BitSet -> BitSet
-minusBS (MkBS x) (MkBS y) = MkBS (x `bitAnd` (bitCompl y))
-
-listBS :: BitSet -> [Int]
-listBS (MkBS s) = listify s 0
-    where listify s n = 
-           case s of
-               0 -> []
-               _ -> let s' = s `bitRsh` 1
-                        more = listify s' (n + 1)
-                    in case (s `bitAnd` 1) of
-                           0 -> more
-                           _ -> n : more
-
-#endif
-
-\end{code}
-
-
-
-