LLVM  9.0.0svn
ADCE.h
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1 //===- ADCE.h - Aggressive 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 provides the interface for the Aggressive Dead Code Elimination
10 // pass. This pass optimistically assumes that all instructions are dead until
11 // proven otherwise, allowing it to eliminate dead computations that other DCE
12 // passes do not catch, particularly involving loop computations.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_TRANSFORMS_SCALAR_ADCE_H
17 #define LLVM_TRANSFORMS_SCALAR_ADCE_H
18 
19 #include "llvm/IR/PassManager.h"
20 
21 namespace llvm {
22 
23 class Function;
24 
25 /// A DCE pass that assumes instructions are dead until proven otherwise.
26 ///
27 /// This pass eliminates dead code by optimistically assuming that all
28 /// instructions are dead until proven otherwise. This allows it to eliminate
29 /// dead computations that other DCE passes do not catch, particularly involving
30 /// loop computations.
31 struct ADCEPass : PassInfoMixin<ADCEPass> {
33 };
34 
35 } // end namespace llvm
36 
37 #endif // LLVM_TRANSFORMS_SCALAR_ADCE_H
This class represents lattice values for constants.
Definition: AllocatorList.h:23
F(f)
A DCE pass that assumes instructions are dead until proven otherwise.
Definition: ADCE.h:31
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
PreservedAnalyses run(Function &F, FunctionAnalysisManager &)
Definition: ADCE.cpp:673
A container for analyses that lazily runs them and caches their results.
This header defines various interfaces for pass management in LLVM.