1 //===- MachineLoopInfo.cpp - Natural Loop Calculator ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the MachineLoopInfo class that is used to identify natural
11 // loops and determine the loop depth of various nodes of the CFG. Note that
12 // the loops identified may actually be several natural loops that share the
13 // same header node... not just a single natural loop.
15 //===----------------------------------------------------------------------===//
17 #include "llvm/CodeGen/MachineLoopInfo.h"
18 #include "llvm/CodeGen/MachineDominators.h"
19 #include "llvm/CodeGen/Passes.h"
23 TEMPLATE_INSTANTIATION(class LoopBase<MachineBasicBlock>);
24 TEMPLATE_INSTANTIATION(class LoopInfoBase<MachineBasicBlock>);
27 char MachineLoopInfo::ID = 0;
28 RegisterPass<MachineLoopInfo>
29 X("machine-loops", "Machine Natural Loop Construction", true);
32 const PassInfo *llvm::MachineLoopInfoID = X.getPassInfo();
34 bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
36 LI->Calculate(getAnalysis<MachineDominatorTree>().getBase()); // Update
40 void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
42 AU.addRequired<MachineDominatorTree>();
45 // Ensure this file gets linked when MachineLoopInfo.h is used.
46 DEFINING_FILE_FOR(MachineLoopInfo)