[project @ 2000-03-22 12:01:57 by rrt]

[ghc-hetmet.git] / ghc / lib / std / Complex.lhs

diff --git a/ghc/lib/std/Complex.lhs b/ghc/lib/std/Complex.lhs
index f92144e..eca2738 100644 (file)
--- a/ghc/lib/std/Complex.lhs
+++ b/ghc/lib/std/Complex.lhs
@@ -71,7 +71,7 @@ polar z                =  (magnitude z, phase z)
 
 magnitude :: (RealFloat a) => Complex a -> a
 magnitude (x:+y) =  scaleFloat k
-                    (sqrt ((scaleFloat mk x)^2 + (scaleFloat mk y)^2))
+                    (sqrt ((scaleFloat mk x)^(2::Int) + (scaleFloat mk y)^(2::Int)))
                    where k  = max (exponent x) (exponent y)
                          mk = - k
 
@@ -89,6 +89,8 @@ phase (x:+y)   = atan2 y x
 
 \begin{code}
 instance  (RealFloat a) => Num (Complex a)  where
+    {-# SPECIALISE instance Num (Complex Float) #-}
+    {-# SPECIALISE instance Num (Complex Double) #-}
     (x:+y) + (x':+y')  =  (x+x') :+ (y+y')
     (x:+y) - (x':+y')  =  (x-x') :+ (y-y')
     (x:+y) * (x':+y')  =  (x*x'-y*y') :+ (x*y'+y*x')
@@ -99,6 +101,8 @@ instance  (RealFloat a) => Num (Complex a)  where
     fromInteger n      =  fromInteger n :+ 0
 
 instance  (RealFloat a) => Fractional (Complex a)  where
+    {-# SPECIALISE instance Fractional (Complex Float) #-}
+    {-# SPECIALISE instance Fractional (Complex Double) #-}
     (x:+y) / (x':+y')  =  (x*x''+y*y'') / d :+ (y*x''-x*y'') / d
                           where x'' = scaleFloat k x'
                                 y'' = scaleFloat k y'
@@ -108,6 +112,8 @@ instance  (RealFloat a) => Fractional (Complex a)  where
     fromRational a     =  fromRational a :+ 0
 
 instance  (RealFloat a) => Floating (Complex a)        where
+    {-# SPECIALISE instance Floating (Complex Float) #-}
+    {-# SPECIALISE instance Floating (Complex Double) #-}
     pi             =  pi :+ 0
     exp (x:+y)     =  expx * cos y :+ expx * sin y
                       where expx = exp x