llvm-project/llvm/lib/Analysis/LoopDependenceAnalysis.cpp

//===- LoopDependenceAnalysis.cpp - LDA Implementation ----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is the (beginning) of an implementation of a loop dependence analysis
// framework, which is used to detect dependences in memory accesses in loops.
//
// Please note that this is work in progress and the interface is subject to
// change.
//
// TODO: adapt as implementation progresses.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "lda"
#include "llvm/Analysis/LoopDependenceAnalysis.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolution.h"
using namespace llvm;

LoopPass *llvm::createLoopDependenceAnalysisPass() {
  return new LoopDependenceAnalysis();
}

static RegisterPass<LoopDependenceAnalysis>
R("lda", "Loop Dependence Analysis", false, true);
char LoopDependenceAnalysis::ID = 0;

//===----------------------------------------------------------------------===//
//                   LoopDependenceAnalysis Implementation
//===----------------------------------------------------------------------===//

bool LoopDependenceAnalysis::runOnLoop(Loop *L, LPPassManager &) {
  this->L = L;
  SE = &getAnalysis<ScalarEvolution>();
  return false;
}

void LoopDependenceAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesAll();
  AU.addRequired<ScalarEvolution>();
}