[PM] Port LoopInfo to the new pass manager, adding both a LoopAnalysis

[oota-llvm.git] / lib / Analysis / LoopInfo.cpp

diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp
index 5fde485beca516faa01b9b66f91158b49fd965e4..95f6eb0af0f549b49c951b2e218da07871ff13f1 100644 (file)
--- a/lib/Analysis/LoopInfo.cpp
+++ b/lib/Analysis/LoopInfo.cpp
@@ -26,6 +26,7 @@
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Metadata.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include <algorithm>
@@ -667,6 +668,26 @@ void LoopInfo::updateUnloop(Loop *Unloop) {
   }
 }
 
+char LoopAnalysis::PassID;
+
+LoopInfo LoopAnalysis::run(Function &F, AnalysisManager<Function> *AM) {
+  // FIXME: Currently we create a LoopInfo from scratch for every function.
+  // This may prove to be too wasteful due to deallocating and re-allocating
+  // memory each time for the underlying map and vector datastructures. At some
+  // point it may prove worthwhile to use a freelist and recycle LoopInfo
+  // objects. I don't want to add that kind of complexity until the scope of
+  // the problem is better understood.
+  LoopInfo LI;
+  LI.Analyze(AM->getResult<DominatorTreeAnalysis>(F));
+  return std::move(LI);
+}
+
+PreservedAnalyses LoopPrinterPass::run(Function &F,
+                                       AnalysisManager<Function> *AM) {
+  AM->getResult<LoopAnalysis>(F).print(OS);
+  return PreservedAnalyses::all();
+}
+
 //===----------------------------------------------------------------------===//
 // LoopInfo implementation
 //