Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- InstSimplifyPass.h ---------------------------------------*- C++ -*-===//

//

// 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

//

//===----------------------------------------------------------------------===//

/// \file

///

/// Defines passes for running instruction simplification across chunks of IR.

///

//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_SCALAR_INSTSIMPLIFYPASS_H

#define LLVM_TRANSFORMS_SCALAR_INSTSIMPLIFYPASS_H

#include "llvm/IR/PassManager.h"

namespace llvm {

/// Run instruction simplification across each instruction in the function.

///

/// Instruction simplification has useful constraints in some contexts:

/// - It will never introduce *new* instructions.

/// - There is no need to iterate to a fixed point.

///

/// Many passes use instruction simplification as a library facility, but it may

/// also be useful (in tests and other contexts) to have access to this very

/// restricted transform at a pass granularity. However, for a much more

/// powerful and comprehensive peephole optimization engine, see the

/// `instcombine` pass instead.

class InstSimplifyPass : public PassInfoMixin<InstSimplifyPass> {

public:

  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);

};

} // end namespace llvm

#endif // LLVM_TRANSFORMS_SCALAR_INSTSIMPLIFYPASS_H