1 //===- LoopSimplifyCFG.cpp - Loop CFG Simplification Pass -------*- 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 Loop SimplifyCFG Pass. This pass is responsible for
10 // basic loop CFG cleanup, primarily to assist other loop passes. If you
11 // encounter a noncanonical CFG construct that causes another loop pass to
12 // perform suboptimally, this is the place to fix it up.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_TRANSFORMS_SCALAR_LOOPSIMPLIFYCFG_H
17 #define LLVM_TRANSFORMS_SCALAR_LOOPSIMPLIFYCFG_H
18 
19 #include "llvm/Analysis/LoopAnalysisManager.h"
20 #include "llvm/IR/PassManager.h"
21 
22 namespace llvm {
23 
24 class LPMUpdater;
25 class Loop;
26 
27 /// Performs basic CFG simplifications to assist other loop passes.
28 class LoopSimplifyCFGPass : public PassInfoMixin<LoopSimplifyCFGPass> {
29 public:
30   PreservedAnalyses run(Loop &L, LoopAnalysisManager &AM,
31                         LoopStandardAnalysisResults &AR, LPMUpdater &U);
32 };
33 } // end namespace llvm
34 
35 #endif // LLVM_TRANSFORMS_SCALAR_LOOPSIMPLIFYCFG_H
36