toInteger :: a -> Integer
toInt :: a -> Int -- partain: Glasgow extension
- n `quot` d = q where (q,r) = quotRem n d
- n `rem` d = r where (q,r) = quotRem n d
- n `div` d = q where (q,r) = divMod n d
- n `mod` d = r where (q,r) = divMod n d
+ n `quot` d = q where (q,_) = quotRem n d
+ n `rem` d = r where (_,r) = quotRem n d
+ n `div` d = q where (q,_) = divMod n d
+ n `mod` d = r where (_,r) = divMod n d
divMod n d = if signum r == negate (signum d) then (q-1, r+d) else qr
where qr@(q,r) = quotRem n d
fromRational :: Rational -> a
recip x = 1 / x
+ x / y = x * recip y
class (Fractional a) => Floating a where
pi :: a
scaleFloat :: Int -> a -> a
isNaN, isInfinite, isDenormalized, isNegativeZero, isIEEE
:: a -> Bool
+ atan2 :: a -> a -> a
+
exponent x = if m == 0 then 0 else n + floatDigits x
where (m,n) = decodeFloat x
scaleFloat k x = encodeFloat m (n+k)
where (m,n) = decodeFloat x
+
+ atan2 y x
+ | x > 0 = atan (y/x)
+ | x == 0 && y > 0 = pi/2
+ | x < 0 && y > 0 = pi + atan (y/x)
+ |(x <= 0 && y < 0) ||
+ (x < 0 && isNegativeZero y) ||
+ (isNegativeZero x && isNegativeZero y)
+ = -atan2 (-y) x
+ | y == 0 && (x < 0 || isNegativeZero x)
+ = pi -- must be after the previous test on zero y
+ | x==0 && y==0 = y -- must be after the other double zero tests
+ | otherwise = x + y -- x or y is a NaN, return a NaN (via +)
+
\end{code}
%*********************************************************
-- Following chks for zero divisor are non-standard (WDP)
a `quot` b = if b /= 0
then a `quotInt` b
- else error "Integral.Int.quot{PreludeCore}: divide by 0\n"
+ else error "Prelude.Integral.quot{Int}: divide by 0"
a `rem` b = if b /= 0
then a `remInt` b
- else error "Integral.Int.rem{PreludeCore}: divide by 0\n"
+ else error "Prelude.Integral.rem{Int}: divide by 0"
x `div` y = if x > 0 && y < 0 then quotInt (x-y-1) y
else if x < 0 && y > 0 then quotInt (x-y+1) y
\begin{code}
instance Ord Integer where
- (J# a1 s1 d1) <= (J# a2 s2 d2)
- = (cmpInteger# a1 s1 d1 a2 s2 d2) <=# 0#
-
- (J# a1 s1 d1) < (J# a2 s2 d2)
- = (cmpInteger# a1 s1 d1 a2 s2 d2) <# 0#
-
- (J# a1 s1 d1) >= (J# a2 s2 d2)
- = (cmpInteger# a1 s1 d1 a2 s2 d2) >=# 0#
-
- (J# a1 s1 d1) > (J# a2 s2 d2)
- = (cmpInteger# a1 s1 d1 a2 s2 d2) ># 0#
-
- x@(J# a1 s1 d1) `max` y@(J# a2 s2 d2)
- = if ((cmpInteger# a1 s1 d1 a2 s2 d2) ># 0#) then x else y
-
- x@(J# a1 s1 d1) `min` y@(J# a2 s2 d2)
- = if ((cmpInteger# a1 s1 d1 a2 s2 d2) <# 0#) then x else y
-
- compare (J# a1 s1 d1) (J# a2 s2 d2)
- = case cmpInteger# a1 s1 d1 a2 s2 d2 of { res# ->
+ (S# i) <= (S# j) = i <=# j
+ (J# s d) <= (S# i) = cmpIntegerInt# s d i <=# 0#
+ (S# i) <= (J# s d) = cmpIntegerInt# s d i >=# 0#
+ (J# s1 d1) <= (J# s2 d2) = (cmpInteger# s1 d1 s2 d2) <=# 0#
+
+ (S# i) > (S# j) = i ># j
+ (J# s d) > (S# i) = cmpIntegerInt# s d i ># 0#
+ (S# i) > (J# s d) = cmpIntegerInt# s d i <# 0#
+ (J# s1 d1) > (J# s2 d2) = (cmpInteger# s1 d1 s2 d2) ># 0#
+
+ (S# i) < (S# j) = i <# j
+ (J# s d) < (S# i) = cmpIntegerInt# s d i <# 0#
+ (S# i) < (J# s d) = cmpIntegerInt# s d i ># 0#
+ (J# s1 d1) < (J# s2 d2) = (cmpInteger# s1 d1 s2 d2) <# 0#
+
+ (S# i) >= (S# j) = i >=# j
+ (J# s d) >= (S# i) = cmpIntegerInt# s d i >=# 0#
+ (S# i) >= (J# s d) = cmpIntegerInt# s d i <=# 0#
+ (J# s1 d1) >= (J# s2 d2) = (cmpInteger# s1 d1 s2 d2) >=# 0#
+
+ compare (S# i) (S# j)
+ | i ==# j = EQ
+ | i <=# j = LT
+ | otherwise = GT
+ compare (J# s d) (S# i)
+ = case cmpIntegerInt# s d i of { res# ->
+ if res# <# 0# then LT else
+ if res# ># 0# then GT else EQ
+ }
+ compare (S# i) (J# s d)
+ = case cmpIntegerInt# s d i of { res# ->
+ if res# ># 0# then LT else
+ if res# <# 0# then GT else EQ
+ }
+ compare (J# s1 d1) (J# s2 d2)
+ = case cmpInteger# s1 d1 s2 d2 of { res# ->
if res# <# 0# then LT else
if res# ># 0# then GT else EQ
}
-instance Num Integer where
- (+) (J# a1 s1 d1) (J# a2 s2 d2)
- = case plusInteger# a1 s1 d1 a2 s2 d2 of (# a, s, d #) -> J# a s d
-
- (-) (J# a1 s1 d1) (J# a2 s2 d2)
- = case minusInteger# a1 s1 d1 a2 s2 d2 of (# a, s, d #) -> J# a s d
-
- negate (J# a s d)
- = case negateInteger# a s d of (# a, s, d #) -> J# a s d
+toBig (S# i) = case int2Integer# i of { (# s, d #) -> J# s d }
+toBig i@(J# s d) = i
- (*) (J# a1 s1 d1) (J# a2 s2 d2)
- = case timesInteger# a1 s1 d1 a2 s2 d2 of (# a, s, d #) -> J# a s d
+instance Num Integer where
+ (+) i1@(S# i) i2@(S# j)
+ = case addIntC# i j of { (# r, c #) ->
+ if c ==# 0# then S# r
+ else toBig i1 + toBig i2 }
+ (+) i1@(J# s d) i2@(S# i) = i1 + toBig i2
+ (+) i1@(S# i) i2@(J# s d) = toBig i1 + i2
+ (+) (J# s1 d1) (J# s2 d2)
+ = case plusInteger# s1 d1 s2 d2 of (# s, d #) -> J# s d
+
+ (-) i1@(S# i) i2@(S# j)
+ = case subIntC# i j of { (# r, c #) ->
+ if c ==# 0# then S# r
+ else toBig i1 - toBig i2 }
+ (-) i1@(J# s d) i2@(S# i) = i1 - toBig i2
+ (-) i1@(S# i) i2@(J# s d) = toBig i1 - i2
+ (-) (J# s1 d1) (J# s2 d2)
+ = case minusInteger# s1 d1 s2 d2 of (# s, d #) -> J# s d
+
+ (*) i1@(S# i) i2@(S# j)
+ = case mulIntC# i j of { (# r, c #) ->
+ if c ==# 0# then S# r
+ else toBig i1 * toBig i2 }
+ (*) i1@(J# s d) i2@(S# i) = i1 * toBig i2
+ (*) i1@(S# i) i2@(J# s d) = toBig i1 * i2
+ (*) (J# s1 d1) (J# s2 d2)
+ = case timesInteger# s1 d1 s2 d2 of (# s, d #) -> J# s d
+
+ negate i@(S# (-2147483648#)) = 2147483648
+ negate (S# i) = S# (negateInt# i)
+ negate (J# s d) = J# (negateInt# s) d
-- ORIG: abs n = if n >= 0 then n else -n
- abs n@(J# a1 s1 d1)
- = case 0 of { J# a2 s2 d2 ->
- if (cmpInteger# a1 s1 d1 a2 s2 d2) >=# 0#
+ abs (S# i) = case abs (I# i) of I# j -> S# j
+ abs n@(J# s d)
+ = if (cmpIntegerInt# s d 0#) >=# 0#
then n
- else case negateInteger# a1 s1 d1 of (# a, s, d #) -> J# a s d
- }
+ else J# (negateInt# s) d
- signum n@(J# a1 s1 d1)
- = case 0 of { J# a2 s2 d2 ->
- let
- cmp = cmpInteger# a1 s1 d1 a2 s2 d2
+ signum (S# i) = case signum (I# i) of I# j -> S# j
+ signum (J# s d)
+ = let
+ cmp = cmpIntegerInt# s d 0#
in
- if cmp ># 0# then 1
- else if cmp ==# 0# then 0
- else (negate 1)
- }
+ if cmp ># 0# then S# 1#
+ else if cmp ==# 0# then S# 0#
+ else S# (negateInt# 1#)
fromInteger x = x
- fromInt (I# i) = int2Integer i
+ fromInt (I# i) = S# i
instance Real Integer where
toRational x = x % 1
instance Integral Integer where
- quotRem (J# a1 s1 d1) (J# a2 s2 d2)
- = case (quotRemInteger# a1 s1 d1 a2 s2 d2) of
- (# a3, s3, d3, a4, s4, d4 #)
- -> (J# a3 s3 d3, J# a4 s4 d4)
+ -- ToDo: a `rem` b returns a small integer if b is small,
+ -- a `quot` b returns a small integer if a is small.
+ quotRem (S# i) (S# j)
+ = case quotRem (I# i) (I# j) of ( I# i, I# j ) -> ( S# i, S# j)
+ quotRem i1@(J# s d) i2@(S# i) = quotRem i1 (toBig i2)
+ quotRem i1@(S# i) i2@(J# s d) = quotRem (toBig i1) i2
+ quotRem (J# s1 d1) (J# s2 d2)
+ = case (quotRemInteger# s1 d1 s2 d2) of
+ (# s3, d3, s4, d4 #)
+ -> (J# s3 d3, J# s4 d4)
{- USING THE UNDERLYING "GMP" CODE IS DUBIOUS FOR NOW:
-> (J# a3 s3 d3, J# a4 s4 d4)
-}
toInteger n = n
- toInt (J# a s d) = case (integer2Int# a s d) of { n# -> I# n# }
+ toInt (S# i) = I# i
+ toInt (J# s d) = case (integer2Int# s d) of { n# -> I# n# }
-- the rest are identical to the report default methods;
-- you get slightly better code if you let the compiler
-- see them right here:
+ (S# n) `quot` (S# d) = S# (n `quotInt#` d)
n `quot` d = if d /= 0 then q else
- error "Integral.Integer.quot{PreludeCore}: divide by 0\n"
- where (q,r) = quotRem n d
+ error "Prelude.Integral.quot{Integer}: divide by 0"
+ where (q,_) = quotRem n d
+
+ (S# n) `rem` (S# d) = S# (n `remInt#` d)
n `rem` d = if d /= 0 then r else
- error "Integral.Integer.quot{PreludeCore}: divide by 0\n"
- where (q,r) = quotRem n d
- n `div` d = q where (q,r) = divMod n d
- n `mod` d = r where (q,r) = divMod n d
+ error "Prelude.Integral.rem{Integer}: divide by 0"
+ where (_,r) = quotRem n d
+
+ n `div` d = q where (q,_) = divMod n d
+ n `mod` d = r where (_,r) = divMod n d
divMod n d = case (quotRem n d) of { qr@(q,r) ->
if signum r == negate (signum d) then (q - 1, r+d) else qr }
-- Case-ified by WDP 94/10
instance Enum Integer where
+ succ x = x + 1
+ pred x = x - 1
toEnum n = toInteger n
fromEnum n = toInt n
enumFrom n = n : enumFrom (n + 1)
- enumFromThen m n = en' m (n - m)
- where en' m n = m : en' (m + n) n
- enumFromTo n m = takeWhile (<= m) (enumFrom n)
- enumFromThenTo n m p = takeWhile (if m >= n then (<= p) else (>= p))
- (enumFromThen n m)
+ enumFromThen e1 e2 = en' e1 (e2 - e1)
+ where en' a b = a : en' (a + b) b
+ enumFromTo n m
+ | n <= m = takeWhile (<= m) (enumFrom n)
+ | otherwise = []
+ enumFromThenTo n m p = takeWhile pred (enumFromThen n m)
+ where
+ pred | m >= n = (<= p)
+ | otherwise = (>= p)
instance Show Integer where
showsPrec x = showSignedInteger x
showList = showList__ (showsPrec 0)
+
instance Ix Integer where
- range (m,n) = [m..n]
- index b@(m,n) i
+ range (m,n)
+ | m <= n = [m..n]
+ | otherwise = []
+
+ index b@(m,_) i
| inRange b i = fromInteger (i - m)
- | otherwise = error "Integer.index: Index out of range."
+ | otherwise = indexIntegerError i b
inRange (m,n) i = m <= i && i <= n
+-- Sigh, really want to use helper function in Ix, but
+-- module deps. are too painful.
+{-# NOINLINE indexIntegerError #-}
+indexIntegerError :: Integer -> (Integer,Integer) -> a
+indexIntegerError i rng
+ = error (showString "Ix{Integer}.index: Index " .
+ showParen True (showsPrec 0 i) .
+ showString " out of range " $
+ showParen True (showsPrec 0 rng) "")
+
showSignedInteger :: Int -> Integer -> ShowS
showSignedInteger p n r
- = -- from HBC version; support code follows
- if n < 0 && p > 6 then '(':jtos n++(')':r) else jtos n ++ r
-
-jtos :: Integer -> String
-jtos n
- = if n < 0 then
- '-' : jtos' (-n) []
- else
- jtos' n []
-
-jtos' :: Integer -> String -> String
-jtos' n cs
- = if n < 10 then
- chr (fromInteger (n + ord_0)) : cs
- else
- jtos' q (chr (toInt r + (ord_0::Int)) : cs)
- where
- (q,r) = n `quotRem` 10
-
+ | n < 0 && p > 6 = '(':jtos n (')':r)
+ | otherwise = jtos n r
+
+jtos :: Integer -> String -> String
+jtos i rs
+ | i < 0 = '-' : jtos' (-i) rs
+ | otherwise = jtos' i rs
+ where
+ jtos' :: Integer -> String -> String
+ jtos' n cs
+ | n < 10 = chr (fromInteger n + (ord_0::Int)) : cs
+ | otherwise = jtos' q (chr (toInt r + (ord_0::Int)) : cs)
+ where
+ (q,r) = n `quotRem` 10
\end{code}
%*********************************************************
their greatest common divisor.
\begin{code}
-reduce x 0 = error "{Ratio.%}: zero denominator"
+reduce :: (Integral a) => a -> a -> Ratio a
+reduce _ 0 = error "Ratio.%: zero denominator"
reduce x y = (x `quot` d) :% (y `quot` d)
where d = gcd x y
\end{code}
\begin{code}
x % y = reduce (x * signum y) (abs y)
-numerator (x:%y) = x
+numerator (x :% _) = x
+denominator (_ :% y) = y
-denominator (x:%y) = y
\end{code}
%*********************************************************
gcd :: (Integral a) => a -> a -> a
gcd 0 0 = error "Prelude.gcd: gcd 0 0 is undefined"
gcd x y = gcd' (abs x) (abs y)
- where gcd' x 0 = x
- gcd' x y = gcd' y (x `rem` y)
+ where gcd' a 0 = a
+ gcd' a b = gcd' b (a `rem` b)
{-# SPECIALISE lcm ::
Int -> Int -> Int,
Integer -> Int -> Integer,
Int -> Int -> Int #-}
(^) :: (Num a, Integral b) => a -> b -> a
-x ^ 0 = 1
+_ ^ 0 = 1
x ^ n | n > 0 = f x (n-1) x
where f _ 0 y = y
- f x n y = g x n where
- g x n | even n = g (x*x) (n `quot` 2)
- | otherwise = f x (n-1) (x*y)
+ f a d y = g a d where
+ g b i | even i = g (b*b) (i `quot` 2)
+ | otherwise = f b (i-1) (b*y)
_ ^ _ = error "Prelude.^: negative exponent"
{- SPECIALISE (^^) ::
(^^) :: (Fractional a, Integral b) => a -> b -> a
x ^^ n = if n >= 0 then x^n else recip (x^(negate n))
-atan2 :: (RealFloat a) => a -> a -> a
-atan2 y x = case (signum y, signum x) of
- ( 0, 1) -> 0
- ( 1, 0) -> pi/2
- ( 0,-1) -> pi
- (-1, 0) -> (negate pi)/2
- ( _, 1) -> atan (y/x)
- ( _,-1) -> atan (y/x) + pi
- ( 0, 0) -> error "Prelude.atan2: atan2 of origin"
\end{code}
projects / ghc-hetmet.git / blobdiff