#include <zigzag_stage.h>

Inheritance diagram for fz::ZigzagStage< TIn, TOut >:

Public Member Functions
void	setInverse (bool inv) override

void	setByteTransparent (bool on)

void	execute (fz::stream_t stream, MemoryPool pool, const std::vector< void > &inputs, const std::vector< void * > &outputs, const std::vector< size_t > &sizes) override

std::string	getName () const override

std::vector< size_t >	estimateOutputSizes (const std::vector< size_t > &input_sizes) const override

std::unordered_map< std::string, size_t >	getActualOutputSizesByName () const override

size_t	getActualOutputSize (int index) const override

uint16_t	getStageTypeId () const override

uint8_t	getOutputDataType (size_t output_index) const override

uint8_t	getInputDataType (size_t) const override

size_t	serializeHeader (size_t output_index, uint8_t *buf, size_t max_size) const override

void	deserializeHeader (const uint8_t *buf, size_t size) override

size_t	getMaxHeaderSize (size_t) const override

Public Member Functions inherited from fz::Stage
virtual size_t	getRequiredInputAlignment () const

virtual std::vector< std::string >	getOutputNames () const

int	getOutputIndex (const std::string &name) const

virtual void	saveState ()

virtual std::vector< std::string >	getRunNotes () const

virtual void	setDims (const std::array< size_t, 3 > &dims)

virtual void	onFinalize (size_t, MemoryPool *)

virtual size_t	estimateDeviceFootprintBytes (size_t) const

virtual size_t	estimatePinnedFootprintBytes (size_t) const

virtual void	postStreamSync (fz::stream_t stream)

virtual bool	isGraphCompatible () const

virtual size_t	estimateScratchBytes (const std::vector< size_t > &input_sizes) const

Additional Inherited Members
Static Public Member Functions inherited from fz::Stage
static constexpr bool	isSupportedOnBackend ()

Detailed Description

template<typename TIn, typename TOut = typename std::make_unsigned<TIn>::type>
class fz::ZigzagStage< TIn, TOut >

Element-wise zigzag encode/decode stage. Forward: TIn[] → TOut[]; inverse: TOut[] → TIn[].

Template Parameters

TIn	Signed integer type.
TOut	Corresponding unsigned type (same width as `TIn`).

Member Function Documentation

◆ setInverse()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

void fz::ZigzagStage< TIn, TOut >::setInverse ( bool inverse )

inlineoverridevirtual

Switch between forward (compression) and inverse (decompression) mode. Affects getNumInputs()/getNumOutputs() for stages with asymmetric port counts.

Reimplemented from fz::Stage.

◆ setByteTransparent()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

void fz::ZigzagStage< TIn, TOut >::setByteTransparent ( bool on )

inline

Byte-transparent mode (default off). When enabled, the stage opts out of finalize() type checking by reporting DataType::UNKNOWN on both ports, while still applying the same sizeof(TIn)-word zigzag transform.

This is what lets ZigzagStage act as the LC framework's TCMS component (Two's-Complement → Magnitude-Sign) inside a byte-stream chain: LC's TCMS_N operates on a raw byte stream as N-byte words regardless of the upstream element type, so the typed default (which would reject, e.g., a uint16 codes port feeding Zigzag<int8_t>, or a UINT8 byte stream feeding Zigzag<int64_t>) must be relaxed for the chain to connect.

◆ execute()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

void fz::ZigzagStage< TIn, TOut >::execute	(	fz::stream_t	stream,
		MemoryPool *	pool,
		const std::vector< void * > &	inputs,
		const std::vector< void * > &	outputs,
		const std::vector< size_t > &	sizes
	)

overridevirtual

Execute the stage. Inputs, outputs, and sizes are device pointers/bytes.

Stages may call cudaStreamSynchronize(stream) or issue blocking D2H copies when the algorithm requires it (e.g. Huffman histogram readback for codebook construction, ANS renormalization tables). Such stages must return false from isGraphCompatible() and must document the sync points.

Note: the DAG dispatches sibling nodes (same topological level) via a sequential CPU loop, each enqueuing to its own stream. A sync inside execute() blocks the CPU from dispatching subsequent siblings until the synced stream is idle — this delays parallel branches in wide DAGs. In a linear pipeline there are no siblings and no extra cost.

Implements fz::Stage.

◆ getName()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

std::string fz::ZigzagStage< TIn, TOut >::getName ( ) const

inlineoverridevirtual

Human-readable name used in error messages and debug output.

Implements fz::Stage.

◆ estimateOutputSizes()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

std::vector< size_t > fz::ZigzagStage< TIn, TOut >::estimateOutputSizes ( const std::vector< size_t > & input_sizes ) const

inlineoverridevirtual

Estimate output buffer sizes given input sizes. Used for buffer allocation planning in PREALLOCATE mode — must be a safe upper bound; under-estimation causes buffer overruns.

Implements fz::Stage.

◆ getActualOutputSizesByName()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

std::unordered_map< std::string, size_t > fz::ZigzagStage< TIn, TOut >::getActualOutputSizesByName ( ) const

inlineoverridevirtual

Actual output sizes after execute(), keyed by output port name.

Implements fz::Stage.

◆ getActualOutputSize()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

size_t fz::ZigzagStage< TIn, TOut >::getActualOutputSize ( int index ) const

inlineoverridevirtual

Actual size of a single output by index after execute(). Avoids constructing the map for the common single-output case. Default delegates to getActualOutputSizesByName(); override to return directly from an internal field.

Reimplemented from fz::Stage.

◆ getStageTypeId()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

uint16_t fz::ZigzagStage< TIn, TOut >::getStageTypeId ( ) const

inlineoverridevirtual

Stage type identifier written into the FZM file header.

Implements fz::Stage.

◆ getOutputDataType()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

uint8_t fz::ZigzagStage< TIn, TOut >::getOutputDataType ( size_t output_index ) const

inlineoverridevirtual

DataType enum of the given output port.

Implements fz::Stage.

◆ getInputDataType()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

uint8_t fz::ZigzagStage< TIn, TOut >::getInputDataType ( size_t ) const

inlineoverridevirtual

Expected DataType of the given input port.

Used by Pipeline::finalize() to detect type mismatches between connected stages before any execution. Return DataType::UNKNOWN to opt out of checking — byte-transparent stages (Bitshuffle, RZE, RRE) and mock stages must return UNKNOWN; finalize() skips any connection where either side is UNKNOWN.

Reimplemented from fz::Stage.

◆ serializeHeader()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

size_t fz::ZigzagStage< TIn, TOut >::serializeHeader	(	size_t	output_index,
		uint8_t *	header_buffer,
		size_t	max_size
	)		const

inlineoverridevirtual

Serialize stage config into header_buffer (max 128 bytes) for the FZM file. Return the number of bytes written, or 0 if the stage has no config.

Reimplemented from fz::Stage.

◆ deserializeHeader()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

void fz::ZigzagStage< TIn, TOut >::deserializeHeader	(	const uint8_t *	header_buffer,
		size_t	size
	)

inlineoverridevirtual

Restore stage config from header_buffer during decompression.

Reimplemented from fz::Stage.

◆ getMaxHeaderSize()

template<typename TIn , typename TOut = typename std::make_unsigned<TIn>::type>

size_t fz::ZigzagStage< TIn, TOut >::getMaxHeaderSize ( size_t output_index ) const

inlineoverridevirtual

Maximum bytes this stage writes into its per-output FZM header slot.

Reimplemented from fz::Stage.

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ setInverse()

◆ setByteTransparent()

◆ execute()

◆ getName()

◆ estimateOutputSizes()

◆ getActualOutputSizesByName()

◆ getActualOutputSize()

◆ getStageTypeId()

◆ getOutputDataType()

◆ getInputDataType()

◆ serializeHeader()

◆ deserializeHeader()

◆ getMaxHeaderSize()