mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-22 18:54:02 +01:00
694f018415
RDF is designed to be target agnostic. Therefore it would be useful to have it available for other targets, such as X86. Based on a previous patch by Krzysztof Parzyszek Differential Revision: https://reviews.llvm.org/D75932
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
//===--- RDFDeadCode.h ----------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// RDF-based generic dead code elimination.
|
|
//
|
|
// The main interface of this class are functions "collect" and "erase".
|
|
// This allows custom processing of the function being optimized by a
|
|
// particular consumer. The simplest way to use this class would be to
|
|
// instantiate an object, and then simply call "collect" and "erase",
|
|
// passing the result of "getDeadInstrs()" to it.
|
|
// A more complex scenario would be to call "collect" first, then visit
|
|
// all post-increment instructions to see if the address update is dead
|
|
// or not, and if it is, convert the instruction to a non-updating form.
|
|
// After that "erase" can be called with the set of nodes including both,
|
|
// dead defs from the updating instructions and the nodes corresponding
|
|
// to the dead instructions.
|
|
|
|
#ifndef RDF_DEADCODE_H
|
|
#define RDF_DEADCODE_H
|
|
|
|
#include "llvm/CodeGen/RDFGraph.h"
|
|
#include "llvm/CodeGen/RDFLiveness.h"
|
|
#include "llvm/ADT/SetVector.h"
|
|
|
|
namespace llvm {
|
|
class MachineRegisterInfo;
|
|
|
|
namespace rdf {
|
|
struct DeadCodeElimination {
|
|
DeadCodeElimination(DataFlowGraph &dfg, MachineRegisterInfo &mri)
|
|
: Trace(false), DFG(dfg), MRI(mri), LV(mri, dfg) {}
|
|
|
|
bool collect();
|
|
bool erase(const SetVector<NodeId> &Nodes);
|
|
void trace(bool On) { Trace = On; }
|
|
bool trace() const { return Trace; }
|
|
|
|
SetVector<NodeId> getDeadNodes() { return DeadNodes; }
|
|
SetVector<NodeId> getDeadInstrs() { return DeadInstrs; }
|
|
DataFlowGraph &getDFG() { return DFG; }
|
|
|
|
private:
|
|
bool Trace;
|
|
SetVector<NodeId> LiveNodes;
|
|
SetVector<NodeId> DeadNodes;
|
|
SetVector<NodeId> DeadInstrs;
|
|
DataFlowGraph &DFG;
|
|
MachineRegisterInfo &MRI;
|
|
Liveness LV;
|
|
|
|
template<typename T> struct SetQueue;
|
|
|
|
bool isLiveInstr(const MachineInstr *MI) const;
|
|
void scanInstr(NodeAddr<InstrNode*> IA, SetQueue<NodeId> &WorkQ);
|
|
void processDef(NodeAddr<DefNode*> DA, SetQueue<NodeId> &WorkQ);
|
|
void processUse(NodeAddr<UseNode*> UA, SetQueue<NodeId> &WorkQ);
|
|
};
|
|
} // namespace rdf
|
|
} // namespace llvm
|
|
|
|
#endif
|