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