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{-# LANGUAGE MagicHash #-}
-- Actually, this exercises prelude/PrelRules, but this is the closest
-- place I could find to put it...
import GHC.Exts
import Numeric
import Data.Bits
main = do phex (I# (uncheckedIShiftL# (negateInt# 5#) 2#))
phex (I# (uncheckedIShiftRA# (negateInt# 5#) 1#))
phex (I# (uncheckedIShiftRL# (negateInt# 5#) 1#))
phex (W# (uncheckedShiftL# (int2Word# (negateInt# 5#)) 2#))
phex (W# (uncheckedShiftRL# (int2Word# (negateInt# 5#)) 1#))
phex x = putStrLn (showSigned (\x -> ("0x"++) . showHex x) 0 x "")
{- Too wordsize-dependant
phex x = putStrLn (hex x)
hex x = "0x" ++ [onedigit (fromIntegral ((x `shiftR` (i*4)) .&. 0xF))
| i <- [digits-1,digits-2..0]]
where
digits = bitSize x `div` 4
onedigit n = "0123456789abcdef" !! n
-}
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