tvm::tir::PrimFuncNode Class Reference

Primitive functions that contains TIR statements. More...

#include <function.h>

Inheritance diagram for tvm::tir::PrimFuncNode:

Collaboration diagram for tvm::tir::PrimFuncNode:

Public Member Functions
FuncType	func_type_annotation () const
	Return the derived function annotation of this function. More...
	TVM_OBJECT_ENABLE_SCRIPT_PRINTER ()
	TVM_FFI_DECLARE_OBJECT_INFO_FINAL ("tir.PrimFunc", PrimFuncNode, BaseFuncNode)
Public Member Functions inherited from tvm::BaseFuncNode
template<typename TObjectRef >
ffi::Optional< TObjectRef >	GetAttr (const std::string &attr_key, ffi::Optional< TObjectRef > default_value=std::nullopt) const
	Get a function attribute. More...
template<typename TObjectRef >
ffi::Optional< TObjectRef >	GetAttr (const std::string &attr_key, TObjectRef default_value) const
bool	HasNonzeroAttr (const std::string &attr_key) const
	Check whether the function has an non-zero integer attr. More...
LinkageType	GetLinkageType () const
	Get the type of the linkage. More...
	TVM_FFI_DECLARE_OBJECT_INFO ("ir.BaseFunc", BaseFuncNode, RelaxExprNode)
Public Member Functions inherited from tvm::RelaxExprNode
	TVM_FFI_DECLARE_OBJECT_INFO ("ir.RelaxExpr", RelaxExprNode, BaseExprNode)
Public Member Functions inherited from tvm::BaseExprNode
	TVM_FFI_DECLARE_OBJECT_INFO ("ir.BaseExpr", BaseExprNode, Object)

Static Public Member Functions
static void	RegisterReflection ()
Static Public Member Functions inherited from tvm::BaseFuncNode
static void	RegisterReflection ()
Static Public Member Functions inherited from tvm::RelaxExprNode
static void	RegisterReflection ()
Static Public Member Functions inherited from tvm::BaseExprNode
static void	RegisterReflection ()

Public Attributes
ffi::Array< tir::Var >	params
	Function parameters. More...
Type	ret_type
	The return type of the function. More...
ffi::Map< tir::Var, Buffer >	buffer_map
	Maps some parameters to specific Buffer data structures. More...
tir::Stmt	body
	The body of the function. More...
Public Attributes inherited from tvm::BaseFuncNode
DictAttrs	attrs
	Additional attributes storing the meta-data. More...
Public Attributes inherited from tvm::RelaxExprNode
ffi::Optional< ObjectRef >	struct_info_ = ffi::Optional<ObjectRef>()
	Stores the result of structure information of the expression that encapsulate both static shape and runtime information such as shape. More...
Public Attributes inherited from tvm::BaseExprNode
Span	span
	Span that points to the original source code. Reserved debug information. More...

Additional Inherited Members
Static Public Attributes inherited from tvm::BaseFuncNode
static constexpr const uint32_t	_type_child_slots = 2
Static Public Attributes inherited from tvm::RelaxExprNode
static constexpr const uint32_t	_type_child_slots = 22
Static Public Attributes inherited from tvm::BaseExprNode
static constexpr TVMFFISEqHashKind	_type_s_eq_hash_kind = kTVMFFISEqHashKindTreeNode
static constexpr const uint32_t	_type_child_slots = 64

Detailed Description

Primitive functions that contains TIR statements.

The PrimFunc provides low-level code representation does not automatically manage

See also

PrimFunc

Member Function Documentation

func_type_annotation()

FuncType tvm::tir::PrimFuncNode::func_type_annotation

(

)

const

Return the derived function annotation of this function.

Returns

The function type annotation.

Note

The function type annotation of PrimExpr is directly derived from the Vars without the need of type inference.

RegisterReflection()

static void tvm::tir::PrimFuncNode::RegisterReflection ( )

inlinestatic

TVM_FFI_DECLARE_OBJECT_INFO_FINAL()

tvm::tir::PrimFuncNode::TVM_FFI_DECLARE_OBJECT_INFO_FINAL	(	"tir.PrimFunc"	,
		PrimFuncNode	,
		BaseFuncNode
	)

TVM_OBJECT_ENABLE_SCRIPT_PRINTER()

tvm::tir::PrimFuncNode::TVM_OBJECT_ENABLE_SCRIPT_PRINTER

(

)

Member Data Documentation

body

tir::Stmt tvm::tir::PrimFuncNode::body

The body of the function.

buffer_map

ffi::Map<tir::Var, Buffer> tvm::tir::PrimFuncNode::buffer_map

Maps some parameters to specific Buffer data structures.

buffer_map provides a way to express data structure's field and shape constraints. The provided information is used in the program analysis and the code generation.

• It defines the vars in the Buffer (m, n) in the cases below when they appears in the buffer_map for the first time.
• When a var appears multiple times, they translate into runtime assertion to check the field constraint.

# The corresponding fields of f are as follows
#
# - f.params = [a, b]
# - f.buffer_map = {a: A, b: B}
# - A = decl_buffer(shape=[m, n])
# - B = decl_buffer(shape=[m, n])
 
def f(a, b):
    m, n = var(), var()
    A = bind_buffer(a, shape=[m, n])
    B = bind_buffer(b, shape=[m, n])
    # body

buffer_map is a sugar to express:

• Parameter unpacking: e.g. I can load a.shape[0] to get value of m
• Constraint checking: a.shape[0] must equal b.shape[0] because they both corresponds to m.

While we could have express parameter unpacking and constraint using normal statements, making buffer_map as first class citizen of PrimFunc will make program analysis much easier.

Prior to buffer flattening, which is performed FlattenBuffer for TIR-based schedules, these buffer objects are used directly in the body of the function. After buffer flattening, these buffer objects remain unflattened for use in argument validation, but all usage in the body of the function is done through a flattened alias of the buffer.

params

ffi::Array<tir::Var> tvm::tir::PrimFuncNode::params

Function parameters.

ret_type

Type tvm::tir::PrimFuncNode::ret_type

The return type of the function.

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The documentation for this class was generated from the following file:

• include/tvm/tir/function.h