clash-prelude-0.99.1: CAES Language for Synchronous Hardware - Prelude library

Copyright(C) 2013-2016 University of Twente
LicenseBSD2 (see the file LICENSE)
MaintainerChristiaan Baaij <christiaan.baaij@gmail.com>
Safe HaskellSafe
LanguageHaskell2010
Extensions
  • DataKinds
  • KindSignatures
  • TypeOperators
  • ExplicitNamespaces

Clash.Class.Resize

Description

 
Synopsis

Documentation

class Resize (f :: Nat -> *) where Source #

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 Source #

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) Source #

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

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

Add extra zero bits in front of the MSB

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

Add extra sign bits in front of the MSB

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

Remove bits from the MSB

Instances
Resize BitVector Source # 
Instance details
Resize Index Source # 
Instance details

Methods

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

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

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

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

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

Resize Unsigned Source # 
Instance details
Resize Signed Source # 
Instance details

Methods

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

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

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

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

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