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{-# LANGUAGE MagicHash, UnboxedTuples #-}
import GHC.Prim
import GHC.Word
import Control.Monad
import Data.Bits
main :: IO ()
main = do f 5 6 23
f 0x80000000 0 0x80000001
f 0xFC1D8A3BFB29FC6A 49 0xFD94E3B7FE36FB18
f :: Word -> Word -> Word -> IO ()
f wxHigh@(W# xHigh) wxLow@(W# xLow) wy@(W# y)
= do when debugging $ putStrLn "-----"
when debugging $ putStrLn ("Doing " ++ show (wxHigh, wxLow)
++ " `quotRem` " ++ show wy)
let ix = (toInteger wxHigh `shiftL` bitSize wxHigh)
.|. toInteger wxLow
wanted = ix `quotRem` toInteger wy
when debugging $ putStrLn ("Wanted: " ++ show wanted)
case quotRemWord2# xHigh xLow y of
(# q, r #) ->
do let wq = W# q
wr = W# r
got = (toInteger wq, toInteger wr)
when debugging $ putStrLn ("Got: " ++ show got)
if wanted == got then putStrLn "Worked"
else putStrLn "Failed"
debugging :: Bool
debugging = False
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