Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- SCCP.h - Sparse Conditional Constant Propagation ---------*- 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

//

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

//

// This pass implements  interprocedural sparse conditional constant

// propagation and merging.

//

// Specifically, this:

//   * Assumes values are constant unless proven otherwise

//   * Assumes BasicBlocks are dead unless proven otherwise

//   * Proves values to be constant, and replaces them with constants

//   * Proves conditional branches to be unconditional

//

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

#ifndef LLVM_TRANSFORMS_IPO_SCCP_H

#define LLVM_TRANSFORMS_IPO_SCCP_H

#include "llvm/IR/PassManager.h"

namespace llvm {

class Module;

/// A set of parameters to control various transforms performed by IPSCCP pass.

/// Each of the boolean parameters can be set to:

///   true - enabling the transformation.

///   false - disabling the transformation.

/// Intended use is to create a default object, modify parameters with

/// additional setters and then pass it to IPSCCP.

struct IPSCCPOptions {

  bool AllowFuncSpec;

  IPSCCPOptions(bool AllowFuncSpec = true) : AllowFuncSpec(AllowFuncSpec) {}

  /// Enables or disables Specialization of Functions.

  IPSCCPOptions &setFuncSpec(bool FuncSpec) {

    AllowFuncSpec = FuncSpec;

    return *this;

  }

};

/// Pass to perform interprocedural constant propagation.

class IPSCCPPass : public PassInfoMixin<IPSCCPPass> {

  IPSCCPOptions Options;

public:

  IPSCCPPass() = default;

  IPSCCPPass(IPSCCPOptions Options) : Options(Options) {}

  PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);

  bool isFuncSpecEnabled() const { return Options.AllowFuncSpec; }

};

} // end namespace llvm

#endif // LLVM_TRANSFORMS_IPO_SCCP_H