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      1 //===---- BDCE.cpp - Bit-tracking dead code elimination ---------*- C++ -*-===//
      2 //
      3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
      4 // See https://llvm.org/LICENSE.txt for license information.
      5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
      6 //
      7 //===----------------------------------------------------------------------===//
      8 //
      9 // This file implements the Bit-Tracking Dead Code Elimination pass. Some
     10 // instructions (shifts, some ands, ors, etc.) kill some of their input bits.
     11 // We track these dead bits and remove instructions that compute only these
     12 // dead bits.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_TRANSFORMS_SCALAR_BDCE_H
     17 #define LLVM_TRANSFORMS_SCALAR_BDCE_H
     18 
     19 #include "llvm/IR/Function.h"
     20 #include "llvm/IR/PassManager.h"
     21 
     22 namespace llvm {
     23 
     24 // The Bit-Tracking Dead Code Elimination pass.
     25 struct BDCEPass : PassInfoMixin<BDCEPass> {
     26   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
     27 };
     28 }
     29 
     30 #endif // LLVM_TRANSFORMS_SCALAR_BDCE_H
     31