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{-# LANGUAGE ScopedTypeVariables #-} | |
import Control.Monad | |
import Control.Monad.Fix | |
import Control.Monad.Primitive | |
import Criterion | |
import Criterion.Main | |
import Data.List | |
import Data.STRef | |
import Data.Vector.Unboxed hiding (filter, forM_, (++)) | |
import qualified Data.Vector.Unboxed.Mutable as M | |
import Debug.Trace | |
import GHC.ST | |
import System.Random | |
import Test.QuickCheck | |
import Test.QuickCheck.Instances | |
qs :: Ord a => [a] -> [a] | |
qs [] = [] | |
qs (x:xs) = qs left ++ [x] ++ qs right | |
where | |
left = filter (<x) xs | |
right = filter (>=x) xs | |
quickSort :: Vector Int -> Vector Int | |
quickSort = modify f | |
where | |
f :: (Ord a, PrimMonad m, Unbox a) => MVector (PrimState m) a -> m () | |
f v = qsort v 0 (M.length v - 1) | |
where | |
qsort a low high = | |
when (low < high) $ do | |
p <- partition a low high | |
qsort a low (p - 1) | |
qsort a (p + 1) high | |
partition a low high = do | |
pivot <- M.read a high | |
ix <- go low (high-1) low pivot a | |
M.swap a high ix | |
return ix | |
go l h i pivot a = | |
if l <= h | |
then do | |
aj <- M.read a l | |
if aj <= pivot | |
then do | |
M.swap a l i | |
go (l+1) h (i+1) pivot a | |
else | |
go (l+1) h i pivot a | |
else | |
return i | |
test = quickCheck $ \(v :: Vector Int) -> | |
(quickSort v) == (fromList $ sort (toList v)) | |
main = do | |
k <- Control.Monad.replicateM 1000 $ randomRIO (1,1000 :: Int) | |
let k' = fromList k | |
defaultMain [ | |
bgroup "sorting" [ | |
bench "linked list quicksort nf" $ nf qs k | |
, bench "in-place quicksort nf" $ nf quickSort k' | |
, bench "linked list quicksort whnf" $ whnf qs k | |
, bench "in-place quicksort whnf" $ whnf quickSort k' | |
] | |
] |
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