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57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
//===- LoopInfo.cpp - Natural Loop Calculator -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the LoopInfo class that is used to identify natural loops
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// and determine the loop depth of various nodes of the CFG. Note that the
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// loops identified may actually be several natural loops that share the same
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// header node... not just a single natural loop.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Constants.h"
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#include "llvm/Instructions.h"
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#include "llvm/Analysis/Dominators.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include <algorithm>
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#include <ostream>
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using namespace llvm;
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char LoopInfo::ID = 0;
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static RegisterPass<LoopInfo>
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X("loops", "Natural Loop Construction", false, true);
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//===----------------------------------------------------------------------===//
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// Loop implementation
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//
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/// getNumBackEdges - Calculate the number of back edges to the loop header.
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///
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//===----------------------------------------------------------------------===//
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// LoopInfo implementation
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//
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bool LoopInfo::runOnFunction(Function &) {
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releaseMemory();
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LI->Calculate(getAnalysis<DominatorTree>().getBase()); // Update
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return false;
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}
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void LoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<DominatorTree>();
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}
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// Ensure this file gets linked when LoopInfo.h is used.
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DEFINING_FILE_FOR(LoopInfo)
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