1 //===- MachineLoopInfo.cpp - Natural Loop Calculator ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Owen Anderson and is distributed under
6 // the University of Illinois Open Source 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"
22 TEMPLATE_INSTANTIATION(class LoopBase<MachineBasicBlock>);
23 TEMPLATE_INSTANTIATION(class LoopInfoBase<MachineBasicBlock>);
25 char MachineLoopInfo::ID = 0;
26 static RegisterPass<MachineLoopInfo>
27 X("machine-loops", "Machine Natural Loop Construction", true);
29 bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
31 LI->Calculate(getAnalysis<MachineDominatorTree>().getBase()); // Update
35 void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
37 AU.addRequired<MachineDominatorTree>();
40 // Ensure this file gets linked when MachineLoopInfo.h is used.
41 DEFINING_FILE_FOR(MachineLoopInfo)