module HaskellWorks.Data.Bits.PopCount.PopCount1
( PopCount1(..)
) where
import qualified Data.Bits as DB
import qualified Data.Vector as DV
import qualified Data.Vector.Storable as DVS
import Data.Word
import HaskellWorks.Data.Bits.BitWise
import HaskellWorks.Data.Bits.Types.Broadword
import HaskellWorks.Data.Bits.Types.Builtin
import HaskellWorks.Data.Positioning
import Prelude as P
type FastWord a = Builtin a
fastWord :: a -> FastWord a
fastWord = Builtin
class PopCount1 v where
popCount1 :: v -> Count
instance PopCount1 Bool where
popCount1 True = 1
popCount1 False = 0
instance PopCount1 (Broadword Word8) where
popCount1 (Broadword x0) = Count (fromIntegral x3)
where
x1 = x0 ((x0 .&. 0xaa) .>. 1)
x2 = (x1 .&. 0x33) + ((x1 .>. 2) .&. 0x33)
x3 = (x2 + (x2 .>. 4)) .&. 0x0f
instance PopCount1 (Broadword Word16) where
popCount1 (Broadword x0) = Count (fromIntegral ((x3 * 0x0101) .>. 8))
where
x1 = x0 ((x0 .&. 0xaaaa) .>. 1)
x2 = (x1 .&. 0x3333) + ((x1 .>. 2) .&. 0x3333)
x3 = (x2 + (x2 .>. 4)) .&. 0x0f0f
instance PopCount1 (Broadword Word32) where
popCount1 (Broadword x0) = Count (fromIntegral ((x3 * 0x01010101) .>. 24))
where
x1 = x0 ((x0 .&. 0xaaaaaaaa) .>. 1)
x2 = (x1 .&. 0x33333333) + ((x1 .>. 2) .&. 0x33333333)
x3 = (x2 + (x2 .>. 4)) .&. 0x0f0f0f0f
instance PopCount1 (Broadword Word64) where
popCount1 (Broadword x0) = Count ((x3 * 0x0101010101010101) .>. 56)
where
x1 = x0 ((x0 .&. 0xaaaaaaaaaaaaaaaa) .>. 1)
x2 = (x1 .&. 0x3333333333333333) + ((x1 .>. 2) .&. 0x3333333333333333)
x3 = (x2 + (x2 .>. 4)) .&. 0x0f0f0f0f0f0f0f0f
instance PopCount1 (Builtin Word8) where
popCount1 (Builtin x0) = fromIntegral (DB.popCount x0)
instance PopCount1 (Builtin Word16) where
popCount1 (Builtin x0) = fromIntegral (DB.popCount x0)
instance PopCount1 (Builtin Word32) where
popCount1 (Builtin x0) = fromIntegral (DB.popCount x0)
instance PopCount1 (Builtin Word64) where
popCount1 (Builtin x0) = fromIntegral (DB.popCount x0)
instance PopCount1 Word8 where
popCount1 = fromIntegral . popCount1 . fastWord
instance PopCount1 Word16 where
popCount1 = fromIntegral . popCount1 . fastWord
instance PopCount1 Word32 where
popCount1 = fromIntegral . popCount1 . fastWord
instance PopCount1 Word64 where
popCount1 = fromIntegral . popCount1 . fastWord
instance PopCount1 a => PopCount1 [a] where
popCount1 = P.sum . fmap popCount1
instance PopCount1 a => PopCount1 (DV.Vector a) where
popCount1 = DV.foldl (\c -> (c +) . popCount1) 0
instance (PopCount1 a, DVS.Storable a) => PopCount1 (DVS.Vector a) where
popCount1 = DVS.foldl (\c -> (c +) . popCount1) 0