mlir::BufferViewFlowAnalysis Class Reference

A straight-forward alias analysis which ensures that all dependencies of all values will be determined. More...

#include "mlir/Dialect/Bufferization/Transforms/BufferViewFlowAnalysis.h"

Public Types
using	ValueSetT = SmallPtrSet< Value, 16 >
using	ValueMapT = llvm::DenseMap< Value, ValueSetT >

Public Member Functions
	BufferViewFlowAnalysis (Operation *op)
	Constructs a new alias analysis using the op provided. More...
ValueMapT::const_iterator	find (Value value) const
	Find all immediate dependencies this value could potentially have. More...
ValueMapT::const_iterator	begin () const
	Returns the begin iterator to iterate over all dependencies. More...
ValueMapT::const_iterator	end () const
	Returns the end iterator that can be used in combination with find. More...
ValueSetT	resolve (Value value) const
	Find all immediate and indirect views upon this value. More...
void	remove (const SetVector< Value > &aliasValues)
	Removes the given values from all alias sets. More...
void	rename (Value from, Value to)
	Replaces all occurrences of 'from' in the internal datastructures with 'to'. More...

Detailed Description

A straight-forward alias analysis which ensures that all dependencies of all values will be determined.

This is a requirement for the BufferPlacement class since you need to determine safe positions to place alloc and deallocs. This alias analysis only finds aliases that might have been created on top of the specified view. To find all aliases, resolve the intial alloc/argument value.

Definition at line 23 of file BufferViewFlowAnalysis.h.

Member Typedef Documentation

ValueMapT

using mlir::BufferViewFlowAnalysis::ValueMapT = llvm::DenseMap<Value, ValueSetT>

Definition at line 26 of file BufferViewFlowAnalysis.h.

ValueSetT

using mlir::BufferViewFlowAnalysis::ValueSetT = SmallPtrSet<Value, 16>

Definition at line 25 of file BufferViewFlowAnalysis.h.

Constructor & Destructor Documentation

BufferViewFlowAnalysis()

BufferViewFlowAnalysis::BufferViewFlowAnalysis

(

Operation *

op

)

Constructs a new alias analysis using the op provided.

Definition at line 19 of file BufferViewFlowAnalysis.cpp.

Member Function Documentation

begin()

ValueMapT::const_iterator mlir::BufferViewFlowAnalysis::begin ( ) const

inline

Returns the begin iterator to iterate over all dependencies.

Definition at line 37 of file BufferViewFlowAnalysis.h.

end()

ValueMapT::const_iterator mlir::BufferViewFlowAnalysis::end ( ) const

inline

Returns the end iterator that can be used in combination with find.

Definition at line 40 of file BufferViewFlowAnalysis.h.

find()

ValueMapT::const_iterator mlir::BufferViewFlowAnalysis::find ( Value  value ) const

inline

Find all immediate dependencies this value could potentially have.

Definition at line 32 of file BufferViewFlowAnalysis.h.

remove()

void BufferViewFlowAnalysis::remove

(

const SetVector< Value > &

aliasValues

)

Removes the given values from all alias sets.

Definition at line 43 of file BufferViewFlowAnalysis.cpp.

rename()

void BufferViewFlowAnalysis::rename	(	Value	from,
		Value	to
	)

Replaces all occurrences of 'from' in the internal datastructures with 'to'.

This is useful when the defining operation of a value has to be re-built because additional results have to be added or the types of results have to be changed.

Definition at line 48 of file BufferViewFlowAnalysis.cpp.

resolve()

BufferViewFlowAnalysis::ValueSetT BufferViewFlowAnalysis::resolve

(

Value

rootValue

)

const

Find all immediate and indirect views upon this value.

Find all immediate and indirect dependent buffers this value could potentially have.

This will find all dependencies on this value that can potentially be later in the execution of the program, but will not return values that this alias might have been created from (such as if the value is created by a subview, this will not return the parent view if there is no cyclic behavior). Note that the resulting set will also contain the value provided as it is an alias of itself.

A = * B = subview(A) C = B

Results in resolve(B) returning {B, C}

Note that the resulting set will also contain the value provided as it is a dependent alias of itself.

Definition at line 25 of file BufferViewFlowAnalysis.cpp.

Referenced by hasAllocationScope().

---

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

• include/mlir/Dialect/Bufferization/Transforms/BufferViewFlowAnalysis.h
• lib/Dialect/Bufferization/Transforms/BufferViewFlowAnalysis.cpp