1 //===- SimplifyCFG.h - Simplify and canonicalize the CFG --------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 /// \file
10 /// This file provides the interface for the pass responsible for both
11 /// simplifying and canonicalizing the CFG.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H
16 #define LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H
17 
18 #include "llvm/IR/Function.h"
19 #include "llvm/IR/PassManager.h"
20 
21 namespace llvm {
22 
23 /// \brief A pass to simplify and canonicalize the CFG of a function.
24 ///
25 /// This pass iteratively simplifies the entire CFG of a function, removing
26 /// unnecessary control flows and bringing it into the canonical form expected
27 /// by the rest of the mid-level optimizer.
28 class SimplifyCFGPass {
29   int BonusInstThreshold;
30 
31 public:
name()32   static StringRef name() { return "SimplifyCFGPass"; }
33 
34   /// \brief Construct a pass with the default thresholds.
35   SimplifyCFGPass();
36 
37   /// \brief Construct a pass with a specific bonus threshold.
38   SimplifyCFGPass(int BonusInstThreshold);
39 
40   /// \brief Run the pass over the function.
41   PreservedAnalyses run(Function &F, AnalysisManager<Function> *AM);
42 };
43 
44 }
45 
46 #endif
47