CLaSH.Class.Resize

Documentation

class Resize f where

Coerce a value to be represented by a different number of bits

Minimal complete definition

resize, zeroExtend, truncateB

Methods

resize :: (KnownNat a, KnownNat b) => f a -> f b

A sign-preserving resize operation

• For signed datatypes: Increasing the size of the number replicates the sign bit to the left. Truncating a number to length L keeps the sign bit and the rightmost L-1 bits.
• For unsigned datatypes: Increasing the size of the number extends with zeros to the left. Truncating a number of length N to a length L just removes the left (most significant) N-L bits.

extend :: (KnownNat a, KnownNat b) => f a -> f (b + a)

Perform a zeroExtend for unsigned datatypes, and signExtend for a signed datatypes

zeroExtend :: (KnownNat a, KnownNat b) => f a -> f (b + a)

Add extra zero bits in front of the MSB

signExtend :: (KnownNat a, KnownNat b) => f a -> f (b + a)

Add extra sign bits in front of the MSB

truncateB :: KnownNat a => f (a + b) -> f a

Remove bits from the MSB

Instances

Resize Index

Methods

resize :: (KnownNat a, KnownNat b) => Index a -> Index b

extend :: (KnownNat a, KnownNat b) => Index a -> Index (b + a)

zeroExtend :: (KnownNat a, KnownNat b) => Index a -> Index (b + a)

signExtend :: (KnownNat a, KnownNat b) => Index a -> Index (b + a)

truncateB :: KnownNat a => Index (a + b) -> Index a

Resize BitVector

Methods

resize :: (KnownNat a, KnownNat b) => BitVector a -> BitVector b

extend :: (KnownNat a, KnownNat b) => BitVector a -> BitVector (b + a)

zeroExtend :: (KnownNat a, KnownNat b) => BitVector a -> BitVector (b + a)

signExtend :: (KnownNat a, KnownNat b) => BitVector a -> BitVector (b + a)

truncateB :: KnownNat a => BitVector (a + b) -> BitVector a

Resize Signed

Methods

resize :: (KnownNat a, KnownNat b) => Signed a -> Signed b

extend :: (KnownNat a, KnownNat b) => Signed a -> Signed (b + a)

zeroExtend :: (KnownNat a, KnownNat b) => Signed a -> Signed (b + a)

signExtend :: (KnownNat a, KnownNat b) => Signed a -> Signed (b + a)

truncateB :: KnownNat a => Signed (a + b) -> Signed a

Resize Unsigned

Methods

resize :: (KnownNat a, KnownNat b) => Unsigned a -> Unsigned b

extend :: (KnownNat a, KnownNat b) => Unsigned a -> Unsigned (b + a)

zeroExtend :: (KnownNat a, KnownNat b) => Unsigned a -> Unsigned (b + a)

signExtend :: (KnownNat a, KnownNat b) => Unsigned a -> Unsigned (b + a)

truncateB :: KnownNat a => Unsigned (a + b) -> Unsigned a