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