clash-prelude-1.5.0: Clash: a functional hardware description language - Prelude library
Copyright (C) 2013-2016 University of Twente2021 QBayLogic B.V. BSD2 (see the file LICENSE) QBayLogic B.V. Safe-Inferred Haskell2010

Clash.Prelude.BitIndex

Description

Deprecated: Use Clash.Class.BitPack instead. This module will be removed in Clash 1.8.

Synopsis

# Documentation

(!) :: (BitPack a, Enum i) => a -> i -> Bit Source #

Get the bit at the specified bit index.

NB: Bit indices are DESCENDING.

>>> pack (7 :: Unsigned 6)
0b00_0111
>>> (7 :: Unsigned 6) ! 1
1
>>> (7 :: Unsigned 6) ! 5
0
>>> (7 :: Unsigned 6) ! 6
*** Exception: (!): 6 is out of range [5..0]
...


slice :: (BitPack a, BitSize a ~ ((m + 1) + i)) => SNat m -> SNat n -> a -> BitVector ((m + 1) - n) Source #

Get a slice between bit index m and and bit index n.

NB: Bit indices are DESCENDING.

>>> pack (7 :: Unsigned 6)
0b00_0111
>>> slice d4 d2 (7 :: Unsigned 6)
0b001
>>> slice d6 d4 (7 :: Unsigned 6)

<interactive>:...
• Couldn't match type ‘7 + i0’ with ‘6’
arising from a use of ‘slice’
The type variable ‘i0’ is ambiguous
• In the expression: slice d6 d4 (7 :: Unsigned 6)
In an equation for ‘it’: it = slice d6 d4 (7 :: Unsigned 6)


split :: (BitPack a, BitSize a ~ (m + n), KnownNat n) => a -> (BitVector m, BitVector n) Source #

Split a value of a bit size m + n into a tuple of values with size m and size n.

>>> pack (7 :: Unsigned 6)
0b00_0111
>>> split (7 :: Unsigned 6) :: (BitVector 2, BitVector 4)
(0b00,0b0111)


replaceBit :: (BitPack a, Enum i) => i -> Bit -> a -> a Source #

Set the bit at the specified index

NB: Bit indices are DESCENDING.

>>> pack (-5 :: Signed 6)
0b11_1011
>>> replaceBit 4 0 (-5 :: Signed 6)
-21
>>> pack (-21 :: Signed 6)
0b10_1011
>>> replaceBit 5 0 (-5 :: Signed 6)
27
>>> pack (27 :: Signed 6)
0b01_1011
>>> replaceBit 6 0 (-5 :: Signed 6)
*** Exception: replaceBit: 6 is out of range [5..0]
...


setSlice :: (BitPack a, BitSize a ~ ((m + 1) + i)) => SNat m -> SNat n -> BitVector ((m + 1) - n) -> a -> a Source #

Set the bits between bit index m and bit index n.

NB: Bit indices are DESCENDING.

>>> pack (-5 :: Signed 6)
0b11_1011
>>> setSlice d4 d3 0 (-5 :: Signed 6)
-29
>>> pack (-29 :: Signed 6)
0b10_0011
>>> setSlice d6 d5 0 (-5 :: Signed 6)

<interactive>:...
• Couldn't match type ‘7 + i0’ with ‘6’
arising from a use of ‘setSlice’
The type variable ‘i0’ is ambiguous
• In the expression: setSlice d6 d5 0 (- 5 :: Signed 6)
In an equation for ‘it’: it = setSlice d6 d5 0 (- 5 :: Signed 6)


msb :: BitPack a => a -> Bit Source #

Get the most significant bit.

>>> pack (-4 :: Signed 6)
0b11_1100
>>> msb (-4 :: Signed 6)
1
>>> pack (4 :: Signed 6)
0b00_0100
>>> msb (4 :: Signed 6)
0


lsb :: BitPack a => a -> Bit Source #

Get the least significant bit.

>>> pack (-9 :: Signed 6)
0b11_0111
>>> lsb (-9 :: Signed 6)
1
>>> pack (-8 :: Signed 6)
0b11_1000
>>> lsb (-8 :: Signed 6)
0