Scaffolding for LDA pass.

llvm-svn: 74120

1 files changed, 47 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/LoopDependenceAnalysis.cpp b/llvm/lib/Analysis/LoopDependenceAnalysis.cpp
new file mode 100644
index 00000000000..172a2be6bcf
--- /dev/null
+++ b/llvm/lib/Analysis/LoopDependenceAnalysis.cpp
@@ -0,0 +1,47 @@
+//===- 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>();
+}