This analysis implements sparse constant propagation, which attempts to determine constant-valued results for operations using constant-valued operands, by speculatively folding operations. More...
#include "mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h"
Inheritance diagram for mlir::dataflow::SparseConstantPropagation:Public Member Functions | |
| LogicalResult | visitOperation (Operation *op, ArrayRef< const Lattice< ConstantValue > * > operands, ArrayRef< Lattice< ConstantValue > * > results) override |
| Visit an operation with the lattices of its operands. More... | |
| void | setToEntryState (Lattice< ConstantValue > *lattice) override |
| Set the given lattice element(s) at control flow entry point(s). More... | |
| SparseForwardDataFlowAnalysis (DataFlowSolver &solver) | |
| Public Member Functions inherited from mlir::dataflow::SparseForwardDataFlowAnalysis< Lattice< ConstantValue > > | |
| SparseForwardDataFlowAnalysis (DataFlowSolver &solver) | |
| virtual void | visitExternalCall (CallOpInterface call, ArrayRef< const Lattice< ConstantValue > * > argumentLattices, ArrayRef< Lattice< ConstantValue > * > resultLattices) |
| Visit a call operation to an externally defined function given the lattices of its arguments. More... | |
| virtual void | visitNonControlFlowArguments (Operation *op, const RegionSuccessor &successor, ArrayRef< Lattice< ConstantValue > * > argLattices, unsigned firstIndex) |
| Given an operation with possible region control-flow, the lattices of the operands, and a region successor, compute the lattice values for block arguments that are not accounted for by the branching control flow (ex. More... | |
| Public Member Functions inherited from mlir::dataflow::AbstractSparseForwardDataFlowAnalysis | |
| LogicalResult | initialize (Operation *top) override |
| Initialize the analysis by visiting every owner of an SSA value: all operations and blocks. More... | |
| LogicalResult | visit (ProgramPoint *point) override |
| Visit a program point. More... | |
| Public Member Functions inherited from mlir::DataFlowAnalysis | |
| virtual | ~DataFlowAnalysis () |
| DataFlowAnalysis (DataFlowSolver &solver) | |
| Create an analysis with a reference to the parent solver. More... | |
| virtual void | initializeEquivalentLatticeAnchor (Operation *top) |
| Initialize lattice anchor equivalence class from the provided top-level operation. More... | |
Additional Inherited Members | |
| Protected Member Functions inherited from mlir::dataflow::SparseForwardDataFlowAnalysis< Lattice< ConstantValue > > | |
| Lattice< ConstantValue > * | getLatticeElement (Value value) override |
| Get the lattice element for a value. More... | |
| const Lattice< ConstantValue > * | getLatticeElementFor (ProgramPoint *point, Value value) |
| Get the lattice element for a value and create a dependency on the provided program point. More... | |
| void | setAllToEntryStates (ArrayRef< Lattice< ConstantValue > * > lattices) |
| Protected Member Functions inherited from mlir::dataflow::AbstractSparseForwardDataFlowAnalysis | |
| AbstractSparseForwardDataFlowAnalysis (DataFlowSolver &solver) | |
| const AbstractSparseLattice * | getLatticeElementFor (ProgramPoint *point, Value value) |
| Get a read-only lattice element for a value and add it as a dependency to a program point. More... | |
| void | setAllToEntryStates (ArrayRef< AbstractSparseLattice * > lattices) |
| void | join (AbstractSparseLattice *lhs, const AbstractSparseLattice &rhs) |
| Join the lattice element and propagate and update if it changed. More... | |
| Protected Member Functions inherited from mlir::DataFlowAnalysis | |
| void | addDependency (AnalysisState *state, ProgramPoint *point) |
| Create a dependency between the given analysis state and lattice anchor on this analysis. More... | |
| void | propagateIfChanged (AnalysisState *state, ChangeResult changed) |
| Propagate an update to a state if it changed. More... | |
| template<typename AnchorT > | |
| void | registerAnchorKind () |
| Register a custom lattice anchor class. More... | |
| template<typename AnchorT , typename... Args> | |
| AnchorT * | getLatticeAnchor (Args &&...args) |
| Get or create a custom lattice anchor. More... | |
| template<typename StateT , typename AnchorT > | |
| void | unionLatticeAnchors (AnchorT anchor, AnchorT other) |
| Union input anchors under the given state. More... | |
| template<typename StateT , typename AnchorT > | |
| StateT * | getOrCreate (AnchorT anchor) |
| Get the analysis state associated with the lattice anchor. More... | |
| template<typename StateT , typename AnchorT > | |
| const StateT * | getOrCreateFor (ProgramPoint *dependent, AnchorT anchor) |
Get a read-only analysis state for the given point and create a dependency on dependent. More... | |
| ProgramPoint * | getProgramPointBefore (Operation *op) |
| Get a uniqued program point instance. More... | |
| ProgramPoint * | getProgramPointBefore (Block *block) |
| ProgramPoint * | getProgramPointAfter (Operation *op) |
| ProgramPoint * | getProgramPointAfter (Block *block) |
| const DataFlowConfig & | getSolverConfig () const |
| Return the configuration of the solver used for this analysis. More... | |
Detailed Description
This analysis implements sparse constant propagation, which attempts to determine constant-valued results for operations using constant-valued operands, by speculatively folding operations.
When combined with dead-code analysis, this becomes sparse conditional constant propagation (SCCP).
Definition at line 99 of file ConstantPropagationAnalysis.h.
Member Function Documentation
◆ setToEntryState()
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overridevirtual |
Set the given lattice element(s) at control flow entry point(s).
Implements mlir::dataflow::SparseForwardDataFlowAnalysis< Lattice< ConstantValue > >.
Definition at line 114 of file ConstantPropagationAnalysis.cpp.
References mlir::dataflow::ConstantValue::getUnknownConstant(), mlir::dataflow::Lattice< ValueT >::join(), and mlir::DataFlowAnalysis::propagateIfChanged().
◆ SparseForwardDataFlowAnalysis()
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inlineexplicit |
Definition at line 285 of file SparseAnalysis.h.
◆ visitOperation()
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overridevirtual |
Visit an operation with the lattices of its operands.
This function is expected to set the lattices of the operation's results.
Implements mlir::dataflow::SparseForwardDataFlowAnalysis< Lattice< ConstantValue > >.
Definition at line 46 of file ConstantPropagationAnalysis.cpp.
References mlir::Operation::fold(), mlir::Operation::getAttrDictionary(), mlir::Operation::getDialect(), mlir::dataflow::SparseForwardDataFlowAnalysis< Lattice< ConstantValue > >::getLatticeElement(), mlir::Operation::getNumOperands(), mlir::Operation::getNumRegions(), mlir::Operation::getNumResults(), mlir::Operation::getOperands(), mlir::dataflow::AbstractSparseForwardDataFlowAnalysis::join(), mlir::dataflow::Lattice< ValueT >::join(), mlir::DataFlowAnalysis::propagateIfChanged(), mlir::dataflow::SparseForwardDataFlowAnalysis< Lattice< ConstantValue > >::setAllToEntryStates(), mlir::Operation::setAttrs(), and mlir::Operation::setOperands().
The documentation for this class was generated from the following files:
- include/mlir/Analysis/DataFlow/ConstantPropagationAnalysis.h
- lib/Analysis/DataFlow/ConstantPropagationAnalysis.cpp
