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//===- InstSimplifyPass.h ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
///
/// Defines passes for running instruction simplification across chunks of IR.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
#define LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
#include "llvm/IR/PassManager.h"
namespace llvm {
class FunctionPass;
/// 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);
};
/// Create a legacy pass that does instruction simplification on each
/// instruction in a function.
FunctionPass *createInstSimplifyLegacyPass();
} // end namespace llvm
#endif // LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
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