bp128

package

v1.0.4 Latest Latest Go to latest Published: Mar 9, 2018 License: AGPL-3.0, Apache-2.0, MIT Imports: 4 Imported by: 0

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Valid go.mod file
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Repository

github.com/Wumms/dgraph

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Documentation ¶

Overview ¶

Package bp128 implements SIMD-BP128 integer encoding and decoding. It requires an x86_64/AMD64 CPU that supports SSE2 instructions.

For more details on SIMD-BP128 algorithm see "Decoding billions of integers per second through vectorization" by Daniel Lemire, Leonid Boytsov, and Nathan Kurz at http://arxiv.org/pdf/1209.2137

For the original C++ implementation visit https://github.com/lemire/SIMDCompressionAndIntersection.

Index ¶

Constants
func DeltaPack(in []uint64) []byte
func DeltaUnpack(in []byte, out []uint64)
func NumIntegers(data []byte) int
type BPackEncoder
type BPackIterator

Constants ¶

View Source

const (
	// BlockSize is the number of integers per block. Each
	// block address must be aligned at 16-byte boundaries.
	BlockSize = 256
)

Variables ¶

This section is empty.

Functions ¶

func DeltaPack ¶

func DeltaPack(in []uint64) []byte

func DeltaUnpack ¶

func DeltaUnpack(in []byte, out []uint64)

func NumIntegers ¶

func NumIntegers(data []byte) int

Types ¶

type BPackEncoder ¶

type BPackEncoder struct {
	// contains filtered or unexported fields
}

func (*BPackEncoder) Length ¶

func (bp *BPackEncoder) Length() int

func (*BPackEncoder) PackAppend ¶

func (bp *BPackEncoder) PackAppend(in []uint64)

func (*BPackEncoder) Size ¶

func (bp *BPackEncoder) Size() int

func (*BPackEncoder) WriteTo ¶

func (bp *BPackEncoder) WriteTo(in []byte)

type BPackIterator ¶

type BPackIterator struct {
	// contains filtered or unexported fields
}

func (*BPackIterator) AfterUid ¶

func (pi *BPackIterator) AfterUid(uid uint64) (found bool)

func (*BPackIterator) Init ¶

func (pi *BPackIterator) Init(data []byte, afterUid uint64)

func (*BPackIterator) Length ¶

func (pi *BPackIterator) Length() int

func (*BPackIterator) MaxIntInBlock ¶

func (pi *BPackIterator) MaxIntInBlock() uint64

func (*BPackIterator) Next ¶

func (pi *BPackIterator) Next()

func (*BPackIterator) SkipNext ¶

func (pi *BPackIterator) SkipNext()

func (*BPackIterator) StartIdx ¶

func (pi *BPackIterator) StartIdx() int

Returns the startIndex

func (*BPackIterator) Uids ¶

func (pi *BPackIterator) Uids() []uint64

func (*BPackIterator) Valid ¶

func (pi *BPackIterator) Valid() bool

Source Files ¶

View all Source files

Directories ¶

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