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