1 //===---- BDCE.cpp - Bit-tracking dead code elimination ---------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Bit-Tracking Dead Code Elimination pass. Some 11 // instructions (shifts, some ands, ors, etc.) kill some of their input bits. 12 // We track these dead bits and remove instructions that compute only these 13 // dead bits. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #ifndef LLVM_TRANSFORMS_SCALAR_BDCE_H 18 #define LLVM_TRANSFORMS_SCALAR_BDCE_H 19 20 #include "llvm/IR/Function.h" 21 #include "llvm/IR/PassManager.h" 22 23 namespace llvm { 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
