Functions
dnnl_status_t DNNL_API	dnnl_primitive_desc_iterator_create (dnnl_primitive_desc_iterator_t *iterator, const_dnnl_op_desc_t op_desc, const_dnnl_primitive_attr_t attr, dnnl_engine_t engine, const_dnnl_primitive_desc_t hint_forward_primitive_desc)
	Creates a primitive descriptor `iterator` for given `op_desc`, `attr`, `engine`, and optionally a hint primitive descriptor from forward propagation (required for backward propagation). More...

dnnl_status_t DNNL_API	dnnl_primitive_desc_iterator_next (dnnl_primitive_desc_iterator_t iterator)
	Iterates over primitive descriptors. More...

dnnl_primitive_desc_t DNNL_API	dnnl_primitive_desc_iterator_fetch (const_dnnl_primitive_desc_iterator_t iterator)
	Fetches the current primitive descriptor. More...

dnnl_status_t DNNL_API	dnnl_primitive_desc_iterator_destroy (dnnl_primitive_desc_iterator_t iterator)
	Deletes a primitive descriptor `iterator`.

dnnl_status_t DNNL_API	dnnl_primitive_desc_create (dnnl_primitive_desc_t *primitive_desc, const_dnnl_op_desc_t op_desc, const_dnnl_primitive_attr_t attr, dnnl_engine_t engine, const_dnnl_primitive_desc_t hint_forward_primitive_desc)
	Creates a `primitive_desc` using `op_desc`, `attr`, `engine`, and optionally a hint primitive descriptor from forward propagation. More...

dnnl_status_t DNNL_API	dnnl_primitive_desc_clone (dnnl_primitive_desc_t *primitive_desc, const_dnnl_primitive_desc_t existing_primitive_desc)
	Makes a copy of a `primitive_desc`.

dnnl_status_t DNNL_API	dnnl_primitive_desc_get_attr (const_dnnl_primitive_desc_t primitive_desc, const_dnnl_primitive_attr_t *attr)
	Returns a constant reference to the attribute of a `primitive_desc`. More...

dnnl_status_t DNNL_API	dnnl_primitive_desc_destroy (dnnl_primitive_desc_t primitive_desc)
	Deletes a `primitive_desc`.

dnnl_status_t DNNL_API	dnnl_primitive_desc_query (const_dnnl_primitive_desc_t primitive_desc, dnnl_query_t what, int index, void *result)
	Queries primitive descriptor. More...

const dnnl_memory_desc_t DNNL_API *	dnnl_primitive_desc_query_md (const_dnnl_primitive_desc_t primitive_desc, dnnl_query_t what, int index)
	Queries primitive descriptor for memory descriptor. More...

int DNNL_API	dnnl_primitive_desc_query_s32 (const_dnnl_primitive_desc_t primitive_desc, dnnl_query_t what, int index)
	Queries primitive descriptor for signed 32bit int. More...

dnnl_status_t DNNL_API	dnnl_primitive_create (dnnl_primitive_t *primitive, const_dnnl_primitive_desc_t primitive_desc)
	Creates a `primitive` using a `primitive_desc` descriptor.

dnnl_status_t DNNL_API	dnnl_primitive_execute (const_dnnl_primitive_t primitive, dnnl_stream_t stream, int nargs, const dnnl_exec_arg_t *args)
	Executes a `primitive` using a `stream`, and `nargs` arguments `args`. More...

dnnl_status_t DNNL_API	dnnl_primitive_get_primitive_desc (const_dnnl_primitive_t primitive, const_dnnl_primitive_desc_t *primitive_desc)
	Retrieves a reference to the `primitive_desc` descriptor of given `primitive`. More...

dnnl_status_t DNNL_API	dnnl_primitive_destroy (dnnl_primitive_t primitive)
	Deletes a `primitive`.

Detailed Description

Function Documentation

◆ dnnl_primitive_desc_iterator_create()

dnnl_status_t DNNL_API dnnl_primitive_desc_iterator_create	(	dnnl_primitive_desc_iterator_t *	iterator,
		const_dnnl_op_desc_t	op_desc,
		const_dnnl_primitive_attr_t	attr,
		dnnl_engine_t	engine,
		const_dnnl_primitive_desc_t	hint_forward_primitive_desc
	)

Creates a primitive descriptor iterator for given op_desc, attr, engine, and optionally a hint primitive descriptor from forward propagation (required for backward propagation).

Pass NULL for forward propagation.

◆ dnnl_primitive_desc_iterator_next()

dnnl_status_t DNNL_API dnnl_primitive_desc_iterator_next ( dnnl_primitive_desc_iterator_t iterator )

Iterates over primitive descriptors.

Returns dnnl_iterator_ends if no more primitive descriptors are available.

◆ dnnl_primitive_desc_iterator_fetch()

dnnl_primitive_desc_t DNNL_API dnnl_primitive_desc_iterator_fetch ( const_dnnl_primitive_desc_iterator_t iterator )

Fetches the current primitive descriptor.

Note: The user should delete the fetched primitive descriptor using dnnl_primitive_desc_destroy() once it is no longer needed.

◆ dnnl_primitive_desc_create()

dnnl_status_t DNNL_API dnnl_primitive_desc_create	(	dnnl_primitive_desc_t *	primitive_desc,
		const_dnnl_op_desc_t	op_desc,
		const_dnnl_primitive_attr_t	attr,
		dnnl_engine_t	engine,
		const_dnnl_primitive_desc_t	hint_forward_primitive_desc
	)

Creates a primitive_desc using op_desc, attr, engine, and optionally a hint primitive descriptor from forward propagation.

The call is equivalent to creating a primitive descriptor iterator, immediately fetching a primitive descriptor, and then destroying the iterator.

Examples:: cnn_inference_f32.c, cpu_cnn_training_f32.c, and cross_engine_reorder.c.

◆ dnnl_primitive_desc_get_attr()

dnnl_status_t DNNL_API dnnl_primitive_desc_get_attr	(	const_dnnl_primitive_desc_t	primitive_desc,
		const_dnnl_primitive_attr_t *	attr
	)

Returns a constant reference to the attribute of a primitive_desc.

Warning: The user should not destroy the obtained attr.; The lifetime of an attr is the same as that of a primitive_desc, so it is illegal to use the attr once primitive_desc has been destroyed.

◆ dnnl_primitive_desc_query()

dnnl_status_t DNNL_API dnnl_primitive_desc_query	(	const_dnnl_primitive_desc_t	primitive_desc,
		dnnl_query_t	what,
		int	index,
		void *	result
	)

Queries primitive descriptor.

One of the most typical use cases is to query a primitive descriptor created with source, weights, and destination formats equal to dnnl_format_tag_any about the corresponding memory descriptors (what equals dnnl_query_src_md, dnnl_query_weights_md, and dnnl_query_dst_md respectively) to be able to prepare memory and create reorders if required.

Another quite typical use case is to query an operation primitive descriptor for a workspace (what equals dnnl_query_workspace_md). The returned status dnnl_not_required indicates that a workspace is not required.

Note: When querying a memory descriptor for a scratchpad, a workspace, or an optional parameter, the query will return a zero_md if the parameter is not needed.

A few other possibilities:

query an operation primitive descriptor for the underlying operation descriptor (dnnl_query_convolution_d, dnnl_query_eltwise_d, dnnl_query_rnn_d, etc.)
query an operation primitive descriptor for the implementation information string (dnnl_query_impl_info_str)
query an operation primitive descriptor for the number of inputs and outputs (dnnl_query_num_of_inputs_s32 and dnnl_query_num_of_outputs_s32 respectively)

See also: dnnl_query_t for more options

◆ dnnl_primitive_desc_query_md()

const dnnl_memory_desc_t DNNL_API* dnnl_primitive_desc_query_md	(	const_dnnl_primitive_desc_t	primitive_desc,
		dnnl_query_t	what,
		int	index
	)

Queries primitive descriptor for memory descriptor.

Returns: NULL in case of any error.

This is just a specialized version of dnnl_primitive_desc_query used for convenience.

Examples:: cnn_inference_f32.c, and cpu_cnn_training_f32.c.

◆ dnnl_primitive_desc_query_s32()

int DNNL_API dnnl_primitive_desc_query_s32	(	const_dnnl_primitive_desc_t	primitive_desc,
		dnnl_query_t	what,
		int	index
	)

Queries primitive descriptor for signed 32bit int.

Returns: 0 in case of any error (in particular if the queried entity is not of type int32_t). Note that 0 might also be the actual returned value.