import GHC.Arr
import GHC.Show
import GHC.Err
+import GHC.Float () -- for RealFrac methods
------------------------------------------------------------------------
-- Helper functions
"fromIntegral/Word->Word" fromIntegral = id :: Word -> Word
#-}
+-- No RULES for RealFrac unfortunately.
+-- Going through Int isn't possible because Word's range is not
+-- included in Int's, going through Integer may or may not be slower.
+
------------------------------------------------------------------------
-- type Word8
------------------------------------------------------------------------
"fromIntegral/Word8->a" fromIntegral = \(W8# x#) -> fromIntegral (W# x#)
#-}
+{-# RULES
+"properFraction/Float->(Word8,Float)"
+ forall x. properFraction (x :: Float) =
+ case properFraction x of {
+ (n, y) -> ((fromIntegral :: Int -> Word8) n, y) }
+"truncate/Float->Word8"
+ forall x. truncate (x :: Float) = (fromIntegral :: Int -> Word8) (truncate x)
+"floor/Float->Word8"
+ forall x. floor (x :: Float) = (fromIntegral :: Int -> Word8) (floor x)
+"ceiling/Float->Word8"
+ forall x. ceiling (x :: Float) = (fromIntegral :: Int -> Word8) (ceiling x)
+"round/Float->Word8"
+ forall x. round (x :: Float) = (fromIntegral :: Int -> Word8) (round x)
+ #-}
+
+{-# RULES
+"properFraction/Double->(Word8,Double)"
+ forall x. properFraction (x :: Double) =
+ case properFraction x of {
+ (n, y) -> ((fromIntegral :: Int -> Word8) n, y) }
+"truncate/Double->Word8"
+ forall x. truncate (x :: Double) = (fromIntegral :: Int -> Word8) (truncate x)
+"floor/Double->Word8"
+ forall x. floor (x :: Double) = (fromIntegral :: Int -> Word8) (floor x)
+"ceiling/Double->Word8"
+ forall x. ceiling (x :: Double) = (fromIntegral :: Int -> Word8) (ceiling x)
+"round/Double->Word8"
+ forall x. round (x :: Double) = (fromIntegral :: Int -> Word8) (round x)
+ #-}
+
------------------------------------------------------------------------
-- type Word16
------------------------------------------------------------------------
"fromIntegral/Word16->a" fromIntegral = \(W16# x#) -> fromIntegral (W# x#)
#-}
+{-# RULES
+"properFraction/Float->(Word16,Float)"
+ forall x. properFraction (x :: Float) =
+ case properFraction x of {
+ (n, y) -> ((fromIntegral :: Int -> Word16) n, y) }
+"truncate/Float->Word16"
+ forall x. truncate (x :: Float) = (fromIntegral :: Int -> Word16) (truncate x)
+"floor/Float->Word16"
+ forall x. floor (x :: Float) = (fromIntegral :: Int -> Word16) (floor x)
+"ceiling/Float->Word16"
+ forall x. ceiling (x :: Float) = (fromIntegral :: Int -> Word16) (ceiling x)
+"round/Float->Word16"
+ forall x. round (x :: Float) = (fromIntegral :: Int -> Word16) (round x)
+ #-}
+
+{-# RULES
+"properFraction/Double->(Word16,Double)"
+ forall x. properFraction (x :: Double) =
+ case properFraction x of {
+ (n, y) -> ((fromIntegral :: Int -> Word16) n, y) }
+"truncate/Double->Word16"
+ forall x. truncate (x :: Double) = (fromIntegral :: Int -> Word16) (truncate x)
+"floor/Double->Word16"
+ forall x. floor (x :: Double) = (fromIntegral :: Int -> Word16) (floor x)
+"ceiling/Double->Word16"
+ forall x. ceiling (x :: Double) = (fromIntegral :: Int -> Word16) (ceiling x)
+"round/Double->Word16"
+ forall x. round (x :: Double) = (fromIntegral :: Int -> Word16) (round x)
+ #-}
+
------------------------------------------------------------------------
-- type Word32
------------------------------------------------------------------------
#if WORD_SIZE_IN_BITS > 32
-- Operations may assume and must ensure that it holds only values
-- from its logical range.
+
+-- We can use rewrite rules for the RealFrac methods
+
+{-# RULES
+"properFraction/Float->(Word32,Float)"
+ forall x. properFraction (x :: Float) =
+ case properFraction x of {
+ (n, y) -> ((fromIntegral :: Int -> Word32) n, y) }
+"truncate/Float->Word32"
+ forall x. truncate (x :: Float) = (fromIntegral :: Int -> Word32) (truncate x)
+"floor/Float->Word32"
+ forall x. floor (x :: Float) = (fromIntegral :: Int -> Word32) (floor x)
+"ceiling/Float->Word32"
+ forall x. ceiling (x :: Float) = (fromIntegral :: Int -> Word32) (ceiling x)
+"round/Float->Word32"
+ forall x. round (x :: Float) = (fromIntegral :: Int -> Word32) (round x)
+ #-}
+
+{-# RULES
+"properFraction/Double->(Word32,Double)"
+ forall x. properFraction (x :: Double) =
+ case properFraction x of {
+ (n, y) -> ((fromIntegral :: Int -> Word32) n, y) }
+"truncate/Double->Word32"
+ forall x. truncate (x :: Double) = (fromIntegral :: Int -> Word32) (truncate x)
+"floor/Double->Word32"
+ forall x. floor (x :: Double) = (fromIntegral :: Int -> Word32) (floor x)
+"ceiling/Double->Word32"
+ forall x. ceiling (x :: Double) = (fromIntegral :: Int -> Word32) (ceiling x)
+"round/Double->Word32"
+ forall x. round (x :: Double) = (fromIntegral :: Int -> Word32) (round x)
+ #-}
+
#endif
data Word32 = W32# Word# deriving (Eq, Ord)