Data.Text.Internal.Unsafe.Shift

Warning: this is an internal module, and does not have a stable API or name. Functions in this module may not check or enforce preconditions expected by public modules. Use at your own risk!

Fast, unchecked bit shifting functions.

Documentation

class UnsafeShift a where

This is a workaround for poor optimisation in GHC 6.8.2. It fails to notice constant-width shifts, and adds a test and branch to every shift. This imposes about a 10% performance hit.

These functions are undefined when the amount being shifted by is greater than the size in bits of a machine Int#.

Methods

shiftL :: a -> Int -> a

shiftR :: a -> Int -> a

Instances

UnsafeShift Int

Defined in Data.Text.Internal.Unsafe.Shift

Methods

shiftL :: Int -> Int -> Int

shiftR :: Int -> Int -> Int

UnsafeShift Word16

Defined in Data.Text.Internal.Unsafe.Shift

Methods

shiftL :: Word16 -> Int -> Word16

shiftR :: Word16 -> Int -> Word16

UnsafeShift Word32

Defined in Data.Text.Internal.Unsafe.Shift

Methods

shiftL :: Word32 -> Int -> Word32

shiftR :: Word32 -> Int -> Word32

UnsafeShift Word64

Defined in Data.Text.Internal.Unsafe.Shift

Methods

shiftL :: Word64 -> Int -> Word64

shiftR :: Word64 -> Int -> Word64