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