llvm/llvm/lib/Target/Hexagon/RDFDeadCode.h

//===--- 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 { … };
} // namespace rdf
} // namespace llvm

#endif