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 | |