LLVM  9.0.0svn
BDCE.h
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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> {
27 };
28 }
29 
30 #endif // LLVM_TRANSFORMS_SCALAR_BDCE_H
This class represents lattice values for constants.
Definition: AllocatorList.h:23
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Definition: BDCE.cpp:143
F(f)
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:372
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:153
A container for analyses that lazily runs them and caches their results.
This header defines various interfaces for pass management in LLVM.