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"
22 #define MLB class LoopBase<MachineBasicBlock, MachineLoop>
23 TEMPLATE_INSTANTIATION(MLB);
25 #define MLIB class LoopInfoBase<MachineBasicBlock, MachineLoop>
26 TEMPLATE_INSTANTIATION(MLIB);
29 char MachineLoopInfo::ID = 0;
30 static RegisterPass<MachineLoopInfo>
31 X("machine-loops", "Machine Natural Loop Construction", true);
33 const PassInfo *const llvm::MachineLoopInfoID = &X;
35 bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
37 LI.Calculate(getAnalysis<MachineDominatorTree>().getBase()); // Update
41 void MachineLoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
43 AU.addRequired<MachineDominatorTree>();