2 % (c) The University of Glasgow, 1997-2000
4 \section[PrelWord]{Module @PrelWord@}
10 Word8(..), Word16(..), Word32(..), Word64(..),
12 -- SUP: deprecated in the new FFI, subsumed by fromIntegral
13 , intToWord8 -- :: Int -> Word8
14 , intToWord16 -- :: Int -> Word16
15 , intToWord32 -- :: Int -> Word32
16 , intToWord64 -- :: Int -> Word64
18 , integerToWord8 -- :: Integer -> Word8
19 , integerToWord16 -- :: Integer -> Word16
20 , integerToWord32 -- :: Integer -> Word32
21 , integerToWord64 -- :: Integer -> Word64
23 , word8ToInt -- :: Word8 -> Int
24 , word8ToInteger -- :: Word8 -> Integer
25 , word8ToWord16 -- :: Word8 -> Word16
26 , word8ToWord32 -- :: Word8 -> Word32
27 , word8ToWord64 -- :: Word8 -> Word64
29 , word16ToInt -- :: Word16 -> Int
30 , word16ToInteger -- :: Word16 -> Integer
31 , word16ToWord8 -- :: Word16 -> Word8
32 , word16ToWord32 -- :: Word16 -> Word32
33 , word16ToWord64 -- :: Word16 -> Word64
35 , word32ToInt -- :: Word32 -> Int
36 , word32ToInteger -- :: Word32 -> Integer
37 , word32ToWord8 -- :: Word32 -> Word8
38 , word32ToWord16 -- :: Word32 -> Word16
39 , word32ToWord64 -- :: Word32 -> Word64
41 , word64ToInt -- :: Word64 -> Int
42 , word64ToInteger -- :: Word64 -> Integer
43 , word64ToWord8 -- :: Word64 -> Word8
44 , word64ToWord16 -- :: Word64 -> Word16
45 , word64ToWord32 -- :: Word64 -> Word32
48 , wordToWord8 -- :: Word -> Word8
49 , wordToWord16 -- :: Word -> Word16
50 , wordToWord32 -- :: Word -> Word32
51 , wordToWord64 -- :: Word -> Word64
53 , word8ToWord -- :: Word8 -> Word
54 , word16ToWord -- :: Word16 -> Word
55 , word32ToWord -- :: Word32 -> Word
56 , word64ToWord -- :: Word64 -> Word
58 -- The "official" place to get these from is Addr.
59 -- SUP: deprecated in the new FFI, subsumed by the Storable class
77 , wordToWord8#, wordToWord16#, wordToWord32#, wordToWord64#
79 , word64ToInt64#, int64ToWord64#
80 , wordToWord64#, word64ToWord#
82 , toEnumError, fromEnumError, succError, predError, divZeroError
85 import Numeric ( showInt )
96 -- ---------------------------------------------------------------------------
97 -- Coercion functions (DEPRECATED)
98 -- ---------------------------------------------------------------------------
100 intToWord8 :: Int -> Word8
101 intToWord16 :: Int -> Word16
102 intToWord32 :: Int -> Word32
103 intToWord64 :: Int -> Word64
105 integerToWord8 :: Integer -> Word8
106 integerToWord16 :: Integer -> Word16
107 integerToWord32 :: Integer -> Word32
108 integerToWord64 :: Integer -> Word64
110 word8ToInt :: Word8 -> Int
111 word8ToInteger :: Word8 -> Integer
112 word8ToWord16 :: Word8 -> Word16
113 word8ToWord32 :: Word8 -> Word32
114 word8ToWord64 :: Word8 -> Word64
116 word16ToInt :: Word16 -> Int
117 word16ToInteger :: Word16 -> Integer
118 word16ToWord8 :: Word16 -> Word8
119 word16ToWord32 :: Word16 -> Word32
120 word16ToWord64 :: Word16 -> Word64
122 word32ToInt :: Word32 -> Int
123 word32ToInteger :: Word32 -> Integer
124 word32ToWord8 :: Word32 -> Word8
125 word32ToWord16 :: Word32 -> Word16
126 word32ToWord64 :: Word32 -> Word64
128 word64ToInt :: Word64 -> Int
129 word64ToInteger :: Word64 -> Integer
130 word64ToWord8 :: Word64 -> Word8
131 word64ToWord16 :: Word64 -> Word16
132 word64ToWord32 :: Word64 -> Word32
134 wordToWord8 :: Word -> Word8
135 wordToWord16 :: Word -> Word16
136 wordToWord32 :: Word -> Word32
137 wordToWord64 :: Word -> Word64
139 word8ToWord :: Word8 -> Word
140 word16ToWord :: Word16 -> Word
141 word32ToWord :: Word32 -> Word
142 word64ToWord :: Word64 -> Word
144 intToWord8 = word32ToWord8 . intToWord32
145 intToWord16 = word32ToWord16 . intToWord32
147 integerToWord8 = fromInteger
148 integerToWord16 = fromInteger
150 word8ToInt = word32ToInt . word8ToWord32
151 word8ToInteger = word32ToInteger . word8ToWord32
153 word16ToInt = word32ToInt . word16ToWord32
154 word16ToInteger = word32ToInteger . word16ToWord32
156 #if WORD_SIZE_IN_BYTES > 4
157 intToWord32 (I# x) = W32# ((int2Word# x) `and#` (case (maxBound::Word32) of W32# x# -> x#))
159 intToWord32 (I# x) = W32# (int2Word# x)
162 word32ToInt (W32# x) = I# (word2Int# x)
164 word32ToInteger (W32# x) = word2Integer x
165 integerToWord32 = fromInteger
167 -----------------------------------------------------------------------------
168 -- The following rules for fromIntegral remove the need to export specialized
169 -- conversion functions.
170 -----------------------------------------------------------------------------
173 "fromIntegral/Int->Word8" fromIntegral = intToWord8;
174 "fromIntegral/Int->Word16" fromIntegral = intToWord16;
175 "fromIntegral/Int->Word32" fromIntegral = intToWord32;
176 "fromIntegral/Int->Word64" fromIntegral = intToWord64;
178 "fromIntegral/Integer->Word8" fromIntegral = integerToWord8;
179 "fromIntegral/Integer->Word16" fromIntegral = integerToWord16;
180 "fromIntegral/Integer->Word32" fromIntegral = integerToWord32;
181 "fromIntegral/Integer->Word64" fromIntegral = integerToWord64;
183 "fromIntegral/Word8->Int" fromIntegral = word8ToInt;
184 "fromIntegral/Word8->Integer" fromIntegral = word8ToInteger;
185 "fromIntegral/Word8->Word16" fromIntegral = word8ToWord16;
186 "fromIntegral/Word8->Word32" fromIntegral = word8ToWord32;
187 "fromIntegral/Word8->Word64" fromIntegral = word8ToWord64;
189 "fromIntegral/Word16->Int" fromIntegral = word16ToInt;
190 "fromIntegral/Word16->Integer" fromIntegral = word16ToInteger;
191 "fromIntegral/Word16->Word8" fromIntegral = word16ToWord8;
192 "fromIntegral/Word16->Word32" fromIntegral = word16ToWord32;
193 "fromIntegral/Word16->Word64" fromIntegral = word16ToWord64;
195 "fromIntegral/Word32->Int" fromIntegral = word32ToInt;
196 "fromIntegral/Word32->Integer" fromIntegral = word32ToInteger;
197 "fromIntegral/Word32->Word8" fromIntegral = word32ToWord8;
198 "fromIntegral/Word32->Word16" fromIntegral = word32ToWord16;
199 "fromIntegral/Word32->Word64" fromIntegral = word32ToWord64;
201 "fromIntegral/Word64->Int" fromIntegral = word64ToInt;
202 "fromIntegral/Word64->Integer" fromIntegral = word64ToInteger;
203 "fromIntegral/Word64->Word8" fromIntegral = word64ToWord8;
204 "fromIntegral/Word64->Word16" fromIntegral = word64ToWord16;
205 "fromIntegral/Word64->Word32" fromIntegral = word64ToWord32
210 \subsection[Word8]{The @Word8@ interface}
213 The byte type @Word8@ is represented in the Haskell
214 heap by boxing up a 32-bit quantity, @Word#@. An invariant
215 for this representation is that the higher 24 bits are
216 *always* zeroed out. A consequence of this is that
217 operations that could possibly overflow have to mask
218 out the top three bytes before building the resulting @Word8@.
221 data Word8 = W8# Word#
223 instance CCallable Word8
224 instance CReturnable Word8
226 word8ToWord32 (W8# x) = W32# x
227 word8ToWord16 (W8# x) = W16# x
228 word32ToWord8 (W32# x) = W8# (wordToWord8# x)
230 -- mask out upper three bytes.
231 intToWord8# :: Int# -> Word#
232 intToWord8# i# = (int2Word# i#) `and#` (int2Word# 0xff#)
234 wordToWord8# :: Word# -> Word#
235 wordToWord8# w# = w# `and#` (int2Word# 0xff#)
237 instance Eq Word8 where
238 (W8# x) == (W8# y) = x `eqWord#` y
239 (W8# x) /= (W8# y) = x `neWord#` y
241 instance Ord Word8 where
242 compare (W8# x#) (W8# y#) = compareWord# x# y#
243 (<) (W8# x) (W8# y) = x `ltWord#` y
244 (<=) (W8# x) (W8# y) = x `leWord#` y
245 (>=) (W8# x) (W8# y) = x `geWord#` y
246 (>) (W8# x) (W8# y) = x `gtWord#` y
247 max x@(W8# x#) y@(W8# y#) =
248 case (compareWord# x# y#) of { LT -> y ; EQ -> x ; GT -> x }
249 min x@(W8# x#) y@(W8# y#) =
250 case (compareWord# x# y#) of { LT -> x ; EQ -> x ; GT -> y }
252 -- Helper function, used by Ord Word* instances.
253 compareWord# :: Word# -> Word# -> Ordering
255 | x# `ltWord#` y# = LT
256 | x# `eqWord#` y# = EQ
259 instance Num Word8 where
261 W8# (intToWord8# (word2Int# x +# word2Int# y))
263 W8# (intToWord8# (word2Int# x -# word2Int# y))
265 W8# (intToWord8# (word2Int# x *# word2Int# y))
269 else W8# (int2Word# (0x100# -# x'))
274 fromInteger (S# i#) = W8# (wordToWord8# (int2Word# i#))
275 fromInteger (J# s# d#) = W8# (wordToWord8# (integer2Word# s# d#))
278 instance Bounded Word8 where
282 instance Real Word8 where
283 toRational x = toInteger x % 1
285 -- Note: no need to mask results here
286 -- as they cannot overflow.
287 instance Integral Word8 where
288 div x@(W8# x#) (W8# y#)
289 | y# `neWord#` (int2Word# 0#) = W8# (x# `quotWord#` y#)
290 | otherwise = divZeroError "div{Word8}" x
292 quot x@(W8# x#) (W8# y#)
293 | y# `neWord#` (int2Word# 0#) = W8# (x# `quotWord#` y#)
294 | otherwise = divZeroError "quot{Word8}" x
296 rem x@(W8# x#) (W8# y#)
297 | y# `neWord#` (int2Word# 0#) = W8# (x# `remWord#` y#)
298 | otherwise = divZeroError "rem{Word8}" x
300 mod x@(W8# x#) (W8# y#)
301 | y# `neWord#` (int2Word# 0#) = W8# (x# `remWord#` y#)
302 | otherwise = divZeroError "mod{Word8}" x
304 quotRem (W8# x) (W8# y) = (W8# (x `quotWord#` y), W8# (x `remWord#` y))
305 divMod (W8# x) (W8# y) = (W8# (x `quotWord#` y), W8# (x `remWord#` y))
307 toInteger = toInteger . toInt
310 instance Ix Word8 where
313 | inRange b i = word8ToInt (i-m)
314 | otherwise = indexError b i "Word8"
315 inRange (m,n) i = m <= i && i <= n
317 instance Enum Word8 where
319 | w == maxBound = succError "Word8"
322 | w == minBound = predError "Word8"
326 | i >= toInt (minBound::Word8) && i <= toInt (maxBound::Word8)
327 = W8# (intToWord8# i#)
329 = toEnumError "Word8" i (minBound::Word8,maxBound::Word8)
331 fromEnum (W8# w) = I# (word2Int# w)
333 enumFrom = boundedEnumFrom
334 enumFromThen = boundedEnumFromThen
336 instance Read Word8 where
337 readsPrec _ = readDec
339 instance Show Word8 where
340 showsPrec _ = showInt
343 \subsection[Word16]{The @Word16@ interface}
345 The double byte type @Word16@ is represented in the Haskell
346 heap by boxing up a machine word, @Word#@. An invariant
347 for this representation is that only the lower 16 bits are
348 `active', any bits above are {\em always} zeroed out.
349 A consequence of this is that operations that could possibly
350 overflow have to mask out anything above the lower two bytes
351 before putting together the resulting @Word16@.
354 data Word16 = W16# Word#
356 instance CCallable Word16
357 instance CReturnable Word16
359 word16ToWord8 (W16# x) = W8# (wordToWord8# x)
360 word16ToWord32 (W16# x) = W32# x
362 word32ToWord16 (W32# x) = W16# (wordToWord16# x)
364 -- mask out upper 16 bits.
365 intToWord16# :: Int# -> Word#
366 intToWord16# i# = ((int2Word# i#) `and#` (int2Word# 0xffff#))
368 wordToWord16# :: Word# -> Word#
369 wordToWord16# w# = w# `and#` (int2Word# 0xffff#)
371 instance Eq Word16 where
372 (W16# x) == (W16# y) = x `eqWord#` y
373 (W16# x) /= (W16# y) = x `neWord#` y
375 instance Ord Word16 where
376 compare (W16# x#) (W16# y#) = compareWord# x# y#
377 (<) (W16# x) (W16# y) = x `ltWord#` y
378 (<=) (W16# x) (W16# y) = x `leWord#` y
379 (>=) (W16# x) (W16# y) = x `geWord#` y
380 (>) (W16# x) (W16# y) = x `gtWord#` y
381 max x@(W16# x#) y@(W16# y#) =
382 case (compareWord# x# y#) of { LT -> y ; EQ -> x ; GT -> x }
383 min x@(W16# x#) y@(W16# y#) =
384 case (compareWord# x# y#) of { LT -> x ; EQ -> x ; GT -> y }
388 instance Num Word16 where
389 (W16# x) + (W16# y) =
390 W16# (intToWord16# (word2Int# x +# word2Int# y))
391 (W16# x) - (W16# y) =
392 W16# (intToWord16# (word2Int# x -# word2Int# y))
393 (W16# x) * (W16# y) =
394 W16# (intToWord16# (word2Int# x *# word2Int# y))
398 else W16# (int2Word# (0x10000# -# x'))
403 fromInteger (S# i#) = W16# (wordToWord16# (int2Word# i#))
404 fromInteger (J# s# d#) = W16# (wordToWord16# (integer2Word# s# d#))
405 fromInt = intToWord16
407 instance Bounded Word16 where
411 instance Real Word16 where
412 toRational x = toInteger x % 1
414 instance Integral Word16 where
415 div x@(W16# x#) (W16# y#)
416 | y# `neWord#` (int2Word# 0#) = W16# (x# `quotWord#` y#)
417 | otherwise = divZeroError "div{Word16}" x
419 quot x@(W16# x#) (W16# y#)
420 | y# `neWord#`(int2Word# 0#) = W16# (x# `quotWord#` y#)
421 | otherwise = divZeroError "quot{Word16}" x
423 rem x@(W16# x#) (W16# y#)
424 | y# `neWord#` (int2Word# 0#) = W16# (x# `remWord#` y#)
425 | otherwise = divZeroError "rem{Word16}" x
427 mod x@(W16# x#) (W16# y#)
428 | y# `neWord#` (int2Word# 0#) = W16# (x# `remWord#` y#)
429 | otherwise = divZeroError "mod{Word16}" x
431 quotRem (W16# x) (W16# y) = (W16# (x `quotWord#` y), W16# (x `remWord#` y))
432 divMod (W16# x) (W16# y) = (W16# (x `quotWord#` y), W16# (x `remWord#` y))
434 toInteger = toInteger . toInt
437 instance Ix Word16 where
440 | inRange b i = word16ToInt (i - m)
441 | otherwise = indexError b i "Word16"
442 inRange (m,n) i = m <= i && i <= n
444 instance Enum Word16 where
446 | w == maxBound = succError "Word16"
449 | w == minBound = predError "Word16"
453 | i >= toInt (minBound::Word16) && i <= toInt (maxBound::Word16)
454 = W16# (intToWord16# i#)
456 = toEnumError "Word16" i (minBound::Word16,maxBound::Word16)
458 fromEnum (W16# w) = I# (word2Int# w)
459 enumFrom = boundedEnumFrom
460 enumFromThen = boundedEnumFromThen
462 instance Read Word16 where
463 readsPrec _ = readDec
465 instance Show Word16 where
466 showsPrec _ = showInt
469 \subsection[Word32]{The @Word32@ interface}
471 The quad byte type @Word32@ is represented in the Haskell
472 heap by boxing up a machine word, @Word#@. An invariant
473 for this representation is that any bits above the lower
474 32 are {\em always} zeroed out. A consequence of this is that
475 operations that could possibly overflow have to mask
476 the result before building the resulting @Word16@.
479 data Word32 = W32# Word#
481 instance CCallable Word32
482 instance CReturnable Word32
484 instance Eq Word32 where
485 (W32# x) == (W32# y) = x `eqWord#` y
486 (W32# x) /= (W32# y) = x `neWord#` y
488 instance Ord Word32 where
489 compare (W32# x#) (W32# y#) = compareWord# x# y#
490 (<) (W32# x) (W32# y) = x `ltWord#` y
491 (<=) (W32# x) (W32# y) = x `leWord#` y
492 (>=) (W32# x) (W32# y) = x `geWord#` y
493 (>) (W32# x) (W32# y) = x `gtWord#` y
494 max x@(W32# x#) y@(W32# y#) =
495 case (compareWord# x# y#) of { LT -> y ; EQ -> x ; GT -> x }
496 min x@(W32# x#) y@(W32# y#) =
497 case (compareWord# x# y#) of { LT -> x ; EQ -> x ; GT -> y }
499 instance Num Word32 where
500 (W32# x) + (W32# y) =
501 W32# (intToWord32# (word2Int# x +# word2Int# y))
502 (W32# x) - (W32# y) =
503 W32# (intToWord32# (word2Int# x -# word2Int# y))
504 (W32# x) * (W32# y) =
505 W32# (intToWord32# (word2Int# x *# word2Int# y))
506 #if WORD_SIZE_IN_BYTES == 8
510 else W32# (intToWord32# (0x100000000# -# x'))
514 negate (W32# x) = W32# (intToWord32# (negateInt# (word2Int# x)))
518 fromInteger (S# i#) = W32# (intToWord32# i#)
519 fromInteger (J# s# d#) = W32# (wordToWord32# (integer2Word# s# d#))
520 fromInt (I# x) = W32# (intToWord32# x)
521 -- ToDo: restrict fromInt{eger} range.
523 intToWord32# :: Int# -> Word#
524 wordToWord32# :: Word# -> Word#
526 #if WORD_SIZE_IN_BYTES == 8
527 intToWord32# i# = (int2Word# i#) `and#` (int2Word# 0xffffffff#)
528 wordToWord32# w# = w# `and#` (int2Word# 0xffffffff#)
529 wordToWord64# w# = w#
531 intToWord32# i# = int2Word# i#
532 wordToWord32# w# = w#
535 instance Bounded Word32 where
537 #if WORD_SIZE_IN_BYTES == 8
538 maxBound = 0xffffffff
540 maxBound = minBound - 1
543 instance Real Word32 where
544 toRational x = toInteger x % 1
546 instance Integral Word32 where
548 | y /= 0 = quotWord32 x y
549 | otherwise = divZeroError "div{Word32}" x
552 | y /= 0 = quotWord32 x y
553 | otherwise = divZeroError "quot{Word32}" x
556 | y /= 0 = remWord32 x y
557 | otherwise = divZeroError "rem{Word32}" x
560 | y /= 0 = remWord32 x y
561 | otherwise = divZeroError "mod{Word32}" x
563 quotRem a b = (a `quot` b, a `rem` b)
564 divMod x y = quotRem x y
566 toInteger = word32ToInteger
570 {-# INLINE quotWord32 #-}
571 {-# INLINE remWord32 #-}
572 remWord32, quotWord32 :: Word32 -> Word32 -> Word32
573 (W32# x) `quotWord32` (W32# y) = W32# (x `quotWord#` y)
574 (W32# x) `remWord32` (W32# y) = W32# (x `remWord#` y)
577 instance Ix Word32 where
580 | inRange b i = word32ToInt (i - m)
581 | otherwise = indexError b i "Word32"
582 inRange (m,n) i = m <= i && i <= n
584 instance Enum Word32 where
586 | w == maxBound = succError "Word32"
589 | w == minBound = predError "Word32"
592 -- the toEnum/fromEnum will fail if the mapping isn't legal,
593 -- use the intTo* & *ToInt coercion functions to 'bypass' these range checks.
595 | x >= 0 = intToWord32 x
597 = toEnumError "Word32" x (minBound::Word32,maxBound::Word32)
600 | x <= intToWord32 (maxBound::Int)
603 = fromEnumError "Word32" x
605 enumFrom w = [w .. maxBound]
607 | w1 <= w2 = eftt32 True{-increasing-} w1 diff_f last
613 enumFromThen w1 w2 = [w1,w2 .. last]
618 | otherwise = minBound
620 enumFromThenTo w1 w2 wend = eftt32 increasing w1 step_f last
622 increasing = w1 <= w2
627 | increasing = (> wend)
628 | otherwise = (< wend)
631 | increasing = \ x -> x + diff1
632 | otherwise = \ x -> x - diff2
634 eftt32 :: Bool -> Word32 -> (Word32 -> Word32) -> (Word32-> Bool) -> [Word32]
635 eftt32 increasing init stepper done = go init
639 | increasing && now > nxt = [now] -- oflow
640 | not increasing && now < nxt = [now] -- uflow
641 | otherwise = now : go nxt
645 instance Read Word32 where
646 readsPrec _ = readDec
648 instance Show Word32 where
649 showsPrec _ = showInt
651 -- -----------------------------------------------------------------------------
653 -- -----------------------------------------------------------------------------
655 #if WORD_SIZE_IN_BYTES == 8
656 --data Word64 = W64# Word#
658 word32ToWord64 (W32 w#) = W64# w#
660 word8ToWord64 (W8# w#) = W64# w#
661 word64ToWord8 (W64# w#) = W8# (w# `and#` (int2Word# 0xff#))
663 word16ToWord64 (W16# w#) = W64# w#
664 word64ToWord16 (W64# w#) = W16# (w# `and#` (int2Word# 0xffff#))
666 wordToWord32# :: Word# -> Word#
667 wordToWord32# w# = w# `and#` (case (maxBound::Word32) of W# x# -> x#)
669 word64ToWord32 :: Word64 -> Word32
670 word64ToWord32 (W64# w#) = W32# (wordToWord32# w#)
672 wordToWord64# w# = w#
673 word64ToWord# w# = w#
675 instance Eq Word64 where
676 (W64# x) == (W64# y) = x `eqWord#` y
677 (W64# x) /= (W64# y) = x `neWord#` y
679 instance Ord Word64 where
680 compare (W64# x#) (W64# y#) = compareWord# x# y#
681 (<) (W64# x) (W64# y) = x `ltWord#` y
682 (<=) (W64# x) (W64# y) = x `leWord#` y
683 (>=) (W64# x) (W64# y) = x `geWord#` y
684 (>) (W64# x) (W64# y) = x `gtWord#` y
685 max x@(W64# x#) y@(W64# y#) =
686 case (compareWord# x# y#) of { LT -> y ; EQ -> x ; GT -> x }
687 min x@(W64# x#) y@(W64# y#) =
688 case (compareWord# x# y#) of { LT -> x ; EQ -> x ; GT -> y }
690 instance Num Word64 where
691 (W64# x) + (W64# y) =
692 W64# (intToWord64# (word2Int# x +# word2Int# y))
693 (W64# x) - (W64# y) =
694 W64# (intToWord64# (word2Int# x -# word2Int# y))
695 (W64# x) * (W64# y) =
696 W64# (intToWord64# (word2Int# x *# word2Int# y))
700 else W64# (int2Word# (0x100# -# x'))
705 fromInteger (S# i#) = W64# (int2Word# i#)
706 fromInteger (J# s# d#) = W64# (integer2Word# s# d#)
707 fromInt = intToWord64
709 -- Note: no need to mask results here
710 -- as they cannot overflow.
711 instance Integral Word64 where
712 div x@(W64# x#) (W64# y#)
713 | y# `neWord#` (int2Word# 0#) = W64# (x# `quotWord#` y#)
714 | otherwise = divZeroError "div{Word64}" x
716 quot x@(W64# x#) (W64# y#)
717 | y# `neWord#` (int2Word# 0#) = W64# (x# `quotWord#` y#)
718 | otherwise = divZeroError "quot{Word64}" x
720 rem x@(W64# x#) (W64# y#)
721 | y# `neWord#` (int2Word# 0#) = W64# (x# `remWord#` y#)
722 | otherwise = divZeroError "rem{Word64}" x
724 mod (W64# x) (W64# y)
725 | y# `neWord#` (int2Word# 0#) = W64# (x `remWord#` y)
726 | otherwise = divZeroError "mod{Word64}" x
728 quotRem (W64# x) (W64# y) = (W64# (x `quotWord#` y), W64# (x `remWord#` y))
729 divMod (W64# x) (W64# y) = (W64# (x `quotWord#` y), W64# (x `remWord#` y))
731 toInteger (W64# x) = word2Integer# x
732 toInt x = word64ToInt x
734 #else /* WORD_SIZE_IN_BYTES < 8 */
736 --defined in PrelCCall: data Word64 = W64 Word64# deriving (Eq, Ord, Bounded)
738 -- for completeness sake
739 word32ToWord64 (W32# w#) = W64# (wordToWord64# w#)
740 word64ToWord32 (W64# w#) = W32# (word64ToWord# w#)
742 word8ToWord64 (W8# w#) = W64# (wordToWord64# w#)
743 word64ToWord8 (W64# w#) = W8# ((word64ToWord# w#) `and#` (int2Word# 0xff#))
745 word16ToWord64 (W16# w#) = W64# (wordToWord64# w#)
746 word64ToWord16 (W64# w#) = W16# ((word64ToWord# w#) `and#` (int2Word# 0xffff#))
748 word64ToInteger (W64# w#) =
749 case word64ToInteger# w# of
750 (# s#, p# #) -> J# s# p#
752 case w `quotRem` 0x100000000 of
753 (_,l) -> toInt (word64ToWord32 l)
755 intToWord64# :: Int# -> Word64#
756 intToWord64# i# = wordToWord64# (int2Word# i#)
758 intToWord64 (I# i#) = W64# (intToWord64# i#)
760 integerToWord64 (S# i#) = W64# (intToWord64# i#)
761 integerToWord64 (J# s# d#) = W64# (integerToWord64# s# d#)
763 instance Eq Word64 where
764 (W64# x) == (W64# y) = x `eqWord64#` y
765 (W64# x) /= (W64# y) = not (x `eqWord64#` y)
767 instance Ord Word64 where
768 compare (W64# x#) (W64# y#) = compareWord64# x# y#
769 (<) (W64# x) (W64# y) = x `ltWord64#` y
770 (<=) (W64# x) (W64# y) = x `leWord64#` y
771 (>=) (W64# x) (W64# y) = x `geWord64#` y
772 (>) (W64# x) (W64# y) = x `gtWord64#` y
773 max x@(W64# x#) y@(W64# y#) =
774 case (compareWord64# x# y#) of { LT -> y ; EQ -> x ; GT -> x }
775 min x@(W64# x#) y@(W64# y#) =
776 case (compareWord64# x# y#) of { LT -> x ; EQ -> x ; GT -> y }
778 instance Num Word64 where
779 (W64# x) + (W64# y) =
780 W64# (int64ToWord64# (word64ToInt64# x `plusInt64#` word64ToInt64# y))
781 (W64# x) - (W64# y) =
782 W64# (int64ToWord64# (word64ToInt64# x `minusInt64#` word64ToInt64# y))
783 (W64# x) * (W64# y) =
784 W64# (int64ToWord64# (word64ToInt64# x `timesInt64#` word64ToInt64# y))
787 | otherwise = maxBound - w
791 fromInteger i = integerToWord64 i
792 fromInt = intToWord64
794 -- Note: no need to mask results here as they cannot overflow.
795 -- ToDo: protect against div by zero.
796 instance Integral Word64 where
797 div (W64# x) (W64# y) = W64# (x `quotWord64#` y)
798 quot (W64# x) (W64# y) = W64# (x `quotWord64#` y)
799 rem (W64# x) (W64# y) = W64# (x `remWord64#` y)
800 mod (W64# x) (W64# y) = W64# (x `remWord64#` y)
801 quotRem (W64# x) (W64# y) = (W64# (x `quotWord64#` y), W64# (x `remWord64#` y))
802 divMod (W64# x) (W64# y) = (W64# (x `quotWord64#` y), W64# (x `remWord64#` y))
803 toInteger w64 = word64ToInteger w64
804 toInt x = word64ToInt x
806 compareWord64# :: Word64# -> Word64# -> Ordering
808 | i# `ltWord64#` j# = LT
809 | i# `eqWord64#` j# = EQ
812 -- Word64# primop wrappers:
814 ltWord64# :: Word64# -> Word64# -> Bool
815 ltWord64# x# y# = stg_ltWord64 x# y# /= 0
817 leWord64# :: Word64# -> Word64# -> Bool
818 leWord64# x# y# = stg_leWord64 x# y# /= 0
820 eqWord64# :: Word64# -> Word64# -> Bool
821 eqWord64# x# y# = stg_eqWord64 x# y# /= 0
823 neWord64# :: Word64# -> Word64# -> Bool
824 neWord64# x# y# = stg_neWord64 x# y# /= 0
826 geWord64# :: Word64# -> Word64# -> Bool
827 geWord64# x# y# = stg_geWord64 x# y# /= 0
829 gtWord64# :: Word64# -> Word64# -> Bool
830 gtWord64# x# y# = stg_gtWord64 x# y# /= 0
832 plusInt64# :: Int64# -> Int64# -> Int64#
833 plusInt64# a# b# = case stg_plusInt64 a# b# of { I64# i# -> i# }
835 minusInt64# :: Int64# -> Int64# -> Int64#
836 minusInt64# a# b# = case stg_minusInt64 a# b# of { I64# i# -> i# }
838 timesInt64# :: Int64# -> Int64# -> Int64#
839 timesInt64# a# b# = case stg_timesInt64 a# b# of { I64# i# -> i# }
841 quotWord64# :: Word64# -> Word64# -> Word64#
842 quotWord64# a# b# = case stg_quotWord64 a# b# of { W64# w# -> w# }
844 remWord64# :: Word64# -> Word64# -> Word64#
845 remWord64# a# b# = case stg_remWord64 a# b# of { W64# w# -> w# }
847 negateInt64# :: Int64# -> Int64#
848 negateInt64# a# = case stg_negateInt64 a# of { I64# i# -> i# }
850 word64ToWord# :: Word64# -> Word#
851 word64ToWord# w64# = case stg_word64ToWord w64# of { W# w# -> w# }
853 wordToWord64# :: Word# -> Word64#
854 wordToWord64# w# = case stg_wordToWord64 w# of { W64# w64# -> w64# }
856 word64ToInt64# :: Word64# -> Int64#
857 word64ToInt64# w64# = case stg_word64ToInt64 w64# of { I64# i# -> i# }
859 int64ToWord64# :: Int64# -> Word64#
860 int64ToWord64# i64# = case stg_int64ToWord64 i64# of { W64# w# -> w# }
862 intToInt64# :: Int# -> Int64#
863 intToInt64# i# = case stg_intToInt64 i# of { I64# i64# -> i64# }
865 foreign import "stg_intToInt64" unsafe stg_intToInt64 :: Int# -> Int64
866 foreign import "stg_int64ToWord64" unsafe stg_int64ToWord64 :: Int64# -> Word64
867 foreign import "stg_word64ToInt64" unsafe stg_word64ToInt64 :: Word64# -> Int64
868 foreign import "stg_wordToWord64" unsafe stg_wordToWord64 :: Word# -> Word64
869 foreign import "stg_word64ToWord" unsafe stg_word64ToWord :: Word64# -> Word
870 foreign import "stg_negateInt64" unsafe stg_negateInt64 :: Int64# -> Int64
871 foreign import "stg_remWord64" unsafe stg_remWord64 :: Word64# -> Word64# -> Word64
872 foreign import "stg_quotWord64" unsafe stg_quotWord64 :: Word64# -> Word64# -> Word64
873 foreign import "stg_timesInt64" unsafe stg_timesInt64 :: Int64# -> Int64# -> Int64
874 foreign import "stg_minusInt64" unsafe stg_minusInt64 :: Int64# -> Int64# -> Int64
875 foreign import "stg_plusInt64" unsafe stg_plusInt64 :: Int64# -> Int64# -> Int64
876 foreign import "stg_gtWord64" unsafe stg_gtWord64 :: Word64# -> Word64# -> Int
877 foreign import "stg_geWord64" unsafe stg_geWord64 :: Word64# -> Word64# -> Int
878 foreign import "stg_neWord64" unsafe stg_neWord64 :: Word64# -> Word64# -> Int
879 foreign import "stg_eqWord64" unsafe stg_eqWord64 :: Word64# -> Word64# -> Int
880 foreign import "stg_leWord64" unsafe stg_leWord64 :: Word64# -> Word64# -> Int
881 foreign import "stg_ltWord64" unsafe stg_ltWord64 :: Word64# -> Word64# -> Int
885 instance Enum Word64 where
887 | w == maxBound = succError "Word64"
890 | w == minBound = predError "Word64"
894 | i >= 0 = intToWord64 i
896 = toEnumError "Word64" i (minBound::Word64,maxBound::Word64)
899 | w <= intToWord64 (maxBound::Int)
902 = fromEnumError "Word64" w
904 enumFrom e1 = map integerToWord64 [word64ToInteger e1 .. word64ToInteger maxBound]
905 enumFromTo e1 e2 = map integerToWord64 [word64ToInteger e1 .. word64ToInteger e2]
906 enumFromThen e1 e2 = map integerToWord64 [word64ToInteger e1, word64ToInteger e2 .. word64ToInteger last]
911 | otherwise = maxBound
913 enumFromThenTo e1 e2 e3 = map integerToWord64 [word64ToInteger e1, word64ToInteger e2 .. word64ToInteger e3]
915 instance Show Word64 where
916 showsPrec p x = showsPrec p (word64ToInteger x)
918 instance Read Word64 where
919 readsPrec _ s = [ (integerToWord64 x,r) | (x,r) <- readDec s ]
921 instance Ix Word64 where
924 | inRange b i = word64ToInt (i-m)
925 | otherwise = indexError b i "Word64"
926 inRange (m,n) i = m <= i && i <= n
928 instance Bounded Word64 where
930 maxBound = minBound - 1
932 instance Real Word64 where
933 toRational x = toInteger x % 1
935 -- -----------------------------------------------------------------------------
936 -- Reading/writing words to/from memory
937 -- -----------------------------------------------------------------------------
939 indexWord8OffAddr :: Addr -> Int -> Word8
940 indexWord8OffAddr (A# a#) (I# i#) = W8# (indexWord8OffAddr# a# i#)
942 indexWord16OffAddr :: Addr -> Int -> Word16
943 indexWord16OffAddr (A# a#) (I# i#) = W16# (indexWord16OffAddr# a# i#)
945 indexWord32OffAddr :: Addr -> Int -> Word32
946 indexWord32OffAddr (A# a#) (I# i#) = W32# (indexWord32OffAddr# a# i#)
948 indexWord64OffAddr :: Addr -> Int -> Word64
949 #if WORD_SIZE_IN_BYTES == 8
950 indexWord64OffAddr (A# a#) (I# i#) = W64# (indexWordOffAddr# a# i#)
952 indexWord64OffAddr (A# a#) (I# i#) = W64# (indexWord64OffAddr# a# i#)
956 readWord8OffAddr :: Addr -> Int -> IO Word8
957 readWord8OffAddr (A# a) (I# i)
958 = IO $ \s -> case readWord8OffAddr# a i s of (# s, w #) -> (# s, W8# w #)
960 readWord16OffAddr :: Addr -> Int -> IO Word16
961 readWord16OffAddr (A# a) (I# i)
962 = IO $ \s -> case readWord16OffAddr# a i s of (# s, w #) -> (# s, W16# w #)
964 readWord32OffAddr :: Addr -> Int -> IO Word32
965 readWord32OffAddr (A# a) (I# i)
966 = IO $ \s -> case readWord32OffAddr# a i s of (# s, w #) -> (# s, W32# w #)
968 readWord64OffAddr :: Addr -> Int -> IO Word64
969 #if WORD_SIZE_IN_BYTES == 8
970 readWord64OffAddr (A# a) (I# i)
971 = IO $ \s -> case readWordOffAddr# a i s of (# s, w #) -> (# s, W64# w #)
973 readWord64OffAddr (A# a) (I# i)
974 = IO $ \s -> case readWord64OffAddr# a i s of (# s, w #) -> (# s, W64# w #)
978 writeWord8OffAddr :: Addr -> Int -> Word8 -> IO ()
979 writeWord8OffAddr (A# a#) (I# i#) (W8# w#) = IO $ \ s# ->
980 case (writeWord8OffAddr# a# i# w# s#) of s2# -> (# s2#, () #)
982 writeWord16OffAddr :: Addr -> Int -> Word16 -> IO ()
983 writeWord16OffAddr (A# a#) (I# i#) (W16# w#) = IO $ \ s# ->
984 case (writeWord16OffAddr# a# i# w# s#) of s2# -> (# s2#, () #)
986 writeWord32OffAddr :: Addr -> Int -> Word32 -> IO ()
987 writeWord32OffAddr (A# a#) (I# i#) (W32# w#) = IO $ \ s# ->
988 case (writeWord32OffAddr# a# i# w# s#) of s2# -> (# s2#, () #)
990 writeWord64OffAddr :: Addr -> Int -> Word64 -> IO ()
991 #if WORD_SIZE_IN_BYTES == 8
992 writeWord64OffAddr (A# a#) (I# i#) (W64# w#) = IO $ \ s# ->
993 case (writeWordOffAddr# a# i# w# s#) of s2# -> (# s2#, () #)
995 writeWord64OffAddr (A# a#) (I# i#) (W64# w#) = IO $ \ s# ->
996 case (writeWord64OffAddr# a# i# w# s#) of s2# -> (# s2#, () #)
1000 The Hugs-GHC extension libraries provide functions for going between
1001 Int and the various (un)signed ints. Here we provide the same for
1002 the GHC specific Word type:
1005 word8ToWord (W8# w#) = W# w#
1006 wordToWord8 (W# w#) = W8# (w# `and#` (case (maxBound::Word8) of W8# x# -> x#))
1008 word16ToWord (W16# w#) = W# w#
1009 wordToWord16 (W# w#) = W16# (w# `and#` (case (maxBound::Word16) of W16# x# -> x#))
1011 word32ToWord (W32# w#) = W# w#
1012 wordToWord32 (W# w#) = W32# (w# `and#` (case (maxBound::Word32) of W32# x# -> x#))
1014 wordToWord64 (W# w#) = W64# (wordToWord64# w#)
1015 -- lossy on 32-bit platforms, but provided nontheless.
1016 word64ToWord (W64# w#) = W# (word64ToWord# w#)
1018 word2Integer :: Word# -> Integer
1019 word2Integer w | i >=# 0# = S# i
1020 | otherwise = case word2Integer# w of
1021 (# s, d #) -> J# s d
1022 where i = word2Int# w
1028 signumReal :: (Ord a, Num a) => a -> a
1029 signumReal x | x == 0 = 0
1034 Utils for generating friendly error messages.
1037 toEnumError :: (Show a,Show b) => String -> a -> (b,b) -> c
1038 toEnumError inst_ty tag bnds
1039 = error ("Enum.toEnum{" ++ inst_ty ++ "}: tag " ++
1040 (showParen True (showsPrec 0 tag) $
1041 " is outside of bounds " ++
1044 fromEnumError :: (Show a,Show b) => String -> a -> b
1045 fromEnumError inst_ty tag
1046 = error ("Enum.fromEnum{" ++ inst_ty ++ "}: value " ++
1047 (showParen True (showsPrec 0 tag) $
1048 " is outside of Int's bounds " ++
1049 show (minBound::Int,maxBound::Int)))
1051 succError :: String -> a
1053 = error ("Enum.succ{" ++ inst_ty ++ "}: tried to take `succ' of maxBound")
1055 predError :: String -> a
1057 = error ("Enum.pred{" ++ inst_ty ++ "}: tried to take `pred' of minBound")
1059 divZeroError :: (Show a) => String -> a -> b
1061 = error ("Integral." ++ meth ++ ": divide by 0 (" ++ show v ++ " / 0)")