DSPLIB_bexp

Introduction

The bexp kernel, performs a determination of the block exponent of the vector of elements and returns the maximum exponent.

• The bexp operation returns the minimum norm of the vector.
• The minimum norm corresponds to the maximum exponent.
• This information can then be used to re-normalize the vector. This operation is useful when auto-scaling is required (e.g. in FFT).
• The kernel supports computation of vector of a batch of several inputs in one kernel call.
• The kernel currently supports all signed and unsigned integer data types upto 64 bits

Data Structures
struct	DSPLIB_bexp_InitArgs
	Structure containing the parameters to initialize the kernel. More...

Functions
int32_t	DSPLIB_bexp_getHandleSize (DSPLIB_bexp_InitArgs *pKerInitArgs)
	This is a query function to calculate the size of internal handle. More...
DSPLIB_STATUS	DSPLIB_bexp_init (DSPLIB_kernelHandle handle, DSPLIB_bufParams1D_t *bufParamsIn, DSPLIB_bufParams1D_t *bufParamsOut, const DSPLIB_bexp_InitArgs *pKerInitArgs)
	This function should be called before the DSPLIB_bexp_exec function is called. This function takes care of any one-time operations such as setting up the configuration of required hardware resources, streaming engine in this case. The results of these operations are stored in the handle. More...
DSPLIB_STATUS	DSPLIB_bexp_init_checkParams (DSPLIB_kernelHandle handle, const DSPLIB_bufParams1D_t *bufParamsIn, const DSPLIB_bufParams1D_t *bufParamsOut, const DSPLIB_bexp_InitArgs *pKerInitArgs)
	This function checks the validity of the parameters passed to DSPLIB_bexp_init function. This function is called with the same parameters as the DSPLIB_bexp_init, and this function must be called before the DSPLIB_bexp_init is called. More...
DSPLIB_STATUS	DSPLIB_bexp_exec_checkParams (DSPLIB_kernelHandle handle, const void *restrict pIn, const void *restrict pOut)
	This function checks the validity of the parameters passed to DSPLIB_bexp_exec function. This function is called with the same parameters as the DSPLIB_bexp_exec, and this function must be called before the DSPLIB_bexp_exec is called. More...
DSPLIB_STATUS	DSPLIB_bexp_exec (DSPLIB_kernelHandle handle, void *restrict pIn, void *restrict pOut)
	This function is the main kernel compute function. More...

Function Documentation

DSPLIB_bexp_getHandleSize()

int32_t DSPLIB_bexp_getHandleSize

(

DSPLIB_bexp_InitArgs *

pKerInitArgs

)

This is a query function to calculate the size of internal handle.

Parameters

[in]

pKerInitArgs

: Pointer to structure holding init parameters

Returns

Size of the buffer in bytes

Remarks

Application is expected to allocate buffer of the requested size and provide it as input to other functions requiring it.

Definition at line 29 of file DSPLIB_bexp.cpp.

DSPLIB_bexp_init()

DSPLIB_STATUS DSPLIB_bexp_init	(	DSPLIB_kernelHandle	handle,
		DSPLIB_bufParams1D_t *	bufParamsIn,
		DSPLIB_bufParams1D_t *	bufParamsOut,
		const DSPLIB_bexp_InitArgs *	pKerInitArgs
	)

This function should be called before the DSPLIB_bexp_exec function is called. This function takes care of any one-time operations such as setting up the configuration of required hardware resources, streaming engine in this case. The results of these operations are stored in the handle.

Parameters

[in]	handle	: Active handle to the kernel
[in]	bufParamsIn	: Pointer to the structure containing dimensional information of input buffer
[out]	bufParamsOut	: Pointer to the structure containing dimensional information of ouput buffer
[in]	pKerInitArgs	: Pointer to the structure holding init parameters

Returns

Status value indicating success or failure. Refer to DSPLIB_STATUS.

Remarks

Application is expected to provide a valid handle.

Definition at line 86 of file DSPLIB_bexp.cpp.

DSPLIB_bexp_init_checkParams()

DSPLIB_STATUS DSPLIB_bexp_init_checkParams	(	DSPLIB_kernelHandle	handle,
		const DSPLIB_bufParams1D_t *	bufParamsIn,
		const DSPLIB_bufParams1D_t *	bufParamsOut,
		const DSPLIB_bexp_InitArgs *	pKerInitArgs
	)

This function checks the validity of the parameters passed to DSPLIB_bexp_init function. This function is called with the same parameters as the DSPLIB_bexp_init, and this function must be called before the DSPLIB_bexp_init is called.

Parameters

[in]	handle	: Active handle to the kernel
[in]	bufParamsIn	: Pointer to the structure containing dimensional information of input buffer
[out]	bufParamsOut	: Pointer to the structure containing dimensional information of output buffer
[in]	pKerInitArgs	: Pointer to the structure holding init parameters

Returns

Status value indicating success or failure. Refer to DSPLIB_STATUS.

Remarks

None

Definition at line 35 of file DSPLIB_bexp.cpp.

DSPLIB_bexp_exec_checkParams()

DSPLIB_STATUS DSPLIB_bexp_exec_checkParams	(	DSPLIB_kernelHandle	handle,
		const void *restrict	pIn,
		const void *restrict	pOut
	)

This function checks the validity of the parameters passed to DSPLIB_bexp_exec function. This function is called with the same parameters as the DSPLIB_bexp_exec, and this function must be called before the DSPLIB_bexp_exec is called.

Parameters

[in]	handle	: Active handle to the kernel
[in]	pIn	: Pointer to the structure input buffer 1
[out]	pout	: Pointer to the output buffer

Returns

Status value indicating success or failure. Refer to DSPLIB_STATUS.

Remarks

None

Definition at line 70 of file DSPLIB_bexp.cpp.

DSPLIB_bexp_exec()

DSPLIB_STATUS DSPLIB_bexp_exec	(	DSPLIB_kernelHandle	handle,
		void *restrict	pIn,
		void *restrict	pOut
	)

This function is the main kernel compute function.

Please refer to details under DSPLIB_bexp_exec

Parameters

[in]	handle	: Active handle to the kernel
[in]	pIn	: Pointer to buffer holding the input data
[out]	pOut	: Pointer to buffer holding the output data

Returns

Status value indicating success or failure. Refer to DSPLIB_STATUS.

Assumptions:

• None

Performance Considerations:

For best performance,

• the input and output data buffers are expected to be in L2 memory
• the buffer pointers are assumed to be 64-byte aligned

Remarks

Before calling this function, application is expected to call DSPLIB_bexp_init and DSPLIB_bexp_exec_checkParams functions. This ensures resource configuration and error checks are done only once for several invocations of this function.

Definition at line 170 of file DSPLIB_bexp.cpp.