42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
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//===- InstSimplifyPass.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// Defines passes for running instruction simplification across chunks of IR.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
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#define LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
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#include "llvm/IR/PassManager.h"
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namespace llvm {
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class FunctionPass;
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/// Run instruction simplification across each instruction in the function.
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///
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/// Instruction simplification has useful constraints in some contexts:
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/// - It will never introduce *new* instructions.
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/// - There is no need to iterate to a fixed point.
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///
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/// Many passes use instruction simplification as a library facility, but it may
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/// also be useful (in tests and other contexts) to have access to this very
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/// restricted transform at a pass granularity. However, for a much more
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/// powerful and comprehensive peephole optimization engine, see the
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/// `instcombine` pass instead.
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class InstSimplifyPass : public PassInfoMixin<InstSimplifyPass> {
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public:
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PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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};
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
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