Copyright	(C) 2013-2016 University of Twente 2020 Myrtle Software Ltd
License	BSD2 (see the file LICENSE)
Maintainer	QBayLogic B.V. <devops@qbaylogic.com>
Safe Haskell	Safe
Language	Haskell2010
Extensions	ScopedTypeVariables BangPatterns ViewPatterns DataKinds InstanceSigs StandaloneDeriving DeriveDataTypeable DeriveFunctor DeriveTraversable DeriveFoldable DeriveGeneric DefaultSignatures DeriveLift DerivingStrategies MagicHash KindSignatures TupleSections TypeOperators ExplicitNamespaces ExplicitForAll BinaryLiterals TypeApplications

Clash.Class.Resize

Contents

Resize helpers

Description

Synopsis

class Resize (f :: Nat -> Type) where
- resize :: (KnownNat a, KnownNat b) => f a -> f b
- extend :: (KnownNat a, KnownNat b) => f a -> f (b + a)
- zeroExtend :: (KnownNat a, KnownNat b) => f a -> f (b + a)
- signExtend :: (KnownNat a, KnownNat b) => f a -> f (b + a)
- truncateB :: KnownNat a => f (a + b) -> f a
checkedResize :: forall a b f. (HasCallStack, Resize f, KnownNat a, Integral (f a), KnownNat b, Integral (f b), Bounded (f b)) => f a -> f b
checkedFromIntegral :: forall a b. HasCallStack => (Integral a, Integral b, Bounded b) => a -> b
checkedTruncateB :: forall a b f. (HasCallStack, Resize f, KnownNat b, Integral (f (a + b)), KnownNat a, Integral (f a), Bounded (f a)) => f (a + b) -> f a

Documentation

class Resize (f :: Nat -> Type) 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

Instances details

Resize BitVector Source #
Instance details Defined in Clash.Sized.Internal.BitVector Methods resize :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => BitVector a -> BitVector b Source # extend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => BitVector a -> BitVector (b + a) Source # zeroExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => BitVector a -> BitVector (b + a) Source # signExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => BitVector a -> BitVector (b + a) Source # truncateB :: forall (a :: Nat) (b :: Nat). KnownNat a => BitVector (a + b) -> BitVector a Source #
Resize Index Source #
Instance details Defined in Clash.Sized.Internal.Index Methods resize :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Index a -> Index b Source # extend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Index a -> Index (b + a) Source # zeroExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Index a -> Index (b + a) Source # signExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Index a -> Index (b + a) Source # truncateB :: forall (a :: Nat) (b :: Nat). KnownNat a => Index (a + b) -> Index a Source #
Resize Unsigned Source #
Instance details Defined in Clash.Sized.Internal.Unsigned Methods resize :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Unsigned a -> Unsigned b Source # extend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Unsigned a -> Unsigned (b + a) Source # zeroExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Unsigned a -> Unsigned (b + a) Source # signExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Unsigned a -> Unsigned (b + a) Source # truncateB :: forall (a :: Nat) (b :: Nat). KnownNat a => Unsigned (a + b) -> Unsigned a Source #
Resize Signed Source #
Instance details Defined in Clash.Sized.Internal.Signed Methods resize :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Signed a -> Signed b Source # extend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Signed a -> Signed (b + a) Source # zeroExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Signed a -> Signed (b + a) Source # signExtend :: forall (a :: Nat) (b :: Nat). (KnownNat a, KnownNat b) => Signed a -> Signed (b + a) Source # truncateB :: forall (a :: Nat) (b :: Nat). KnownNat a => Signed (a + b) -> Signed a Source #

Resize helpers

checkedResize :: forall a b f. (HasCallStack, Resize f, KnownNat a, Integral (f a), KnownNat b, Integral (f b), Bounded (f b)) => f a -> f b Source #

Like resize, but errors if f a is out of bounds for f b. Useful when you "know" f a can't be out of bounds, but would like to have your assumptions checked.

N.B.: Check only affects simulation. I.e., no checks will be inserted into the generated HDL

checkedFromIntegral :: forall a b. HasCallStack => (Integral a, Integral b, Bounded b) => a -> b Source #

Like fromIntegral, but errors if a is out of bounds for b. Useful when you "know" a can't be out of bounds, but would like to have your assumptions checked.

N.B.: Check only affects simulation. I.e., no checks will be inserted into the generated HDL

checkedTruncateB :: forall a b f. (HasCallStack, Resize f, KnownNat b, Integral (f (a + b)), KnownNat a, Integral (f a), Bounded (f a)) => f (a + b) -> f a Source #

Like truncateB, but errors if f (a + b) is out of bounds for f a. Useful when you "know" f (a + b) can't be out of bounds, but would like to have your assumptions checked.

N.B.: Check only affects simulation. I.e., no checks will be inserted into the generated HDL