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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/PassManager.h"
  20.  
  21. namespace llvm {
  22.  
  23. class Function;
  24.  
  25. // The Bit-Tracking Dead Code Elimination pass.
  26. struct BDCEPass : PassInfoMixin<BDCEPass> {
  27.   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
  28. };
  29. }
  30.  
  31. #endif // LLVM_TRANSFORMS_SCALAR_BDCE_H
  32.