1 files changed, 182 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp b/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp
new file mode 100644
index 0000000..8ed8e3e
--- /dev/null
+++ b/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp
@@ -0,0 +1,182 @@
+//===- BlockFrequencyInfo.cpp - Block Frequency Analysis ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Loops should be simplified before this analysis.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/BlockFrequencyInfo.h"
+#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
+#include "llvm/Analysis/BranchProbabilityInfo.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/InitializePasses.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/GraphWriter.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "block-freq"
+
+#ifndef NDEBUG
+enum GVDAGType {
+  GVDT_None,
+  GVDT_Fraction,
+  GVDT_Integer
+};
+
+static cl::opt<GVDAGType>
+ViewBlockFreqPropagationDAG("view-block-freq-propagation-dags", cl::Hidden,
+          cl::desc("Pop up a window to show a dag displaying how block "
+                   "frequencies propagation through the CFG."),
+          cl::values(
+            clEnumValN(GVDT_None, "none",
+                       "do not display graphs."),
+            clEnumValN(GVDT_Fraction, "fraction", "display a graph using the "
+                       "fractional block frequency representation."),
+            clEnumValN(GVDT_Integer, "integer", "display a graph using the raw "
+                       "integer fractional block frequency representation."),
+            clEnumValEnd));
+
+namespace llvm {
+
+template <>
+struct GraphTraits<BlockFrequencyInfo *> {
+  typedef const BasicBlock NodeType;
+  typedef succ_const_iterator ChildIteratorType;
+  typedef Function::const_iterator nodes_iterator;
+
+  static inline const NodeType *getEntryNode(const BlockFrequencyInfo *G) {
+    return G->getFunction()->begin();
+  }
+  static ChildIteratorType child_begin(const NodeType *N) {
+    return succ_begin(N);
+  }
+  static ChildIteratorType child_end(const NodeType *N) {
+    return succ_end(N);
+  }
+  static nodes_iterator nodes_begin(const BlockFrequencyInfo *G) {
+    return G->getFunction()->begin();
+  }
+  static nodes_iterator nodes_end(const BlockFrequencyInfo *G) {
+    return G->getFunction()->end();
+  }
+};
+
+template<>
+struct DOTGraphTraits<BlockFrequencyInfo*> : public DefaultDOTGraphTraits {
+  explicit DOTGraphTraits(bool isSimple=false) :
+    DefaultDOTGraphTraits(isSimple) {}
+
+  static std::string getGraphName(const BlockFrequencyInfo *G) {
+    return G->getFunction()->getName();
+  }
+
+  std::string getNodeLabel(const BasicBlock *Node,
+                           const BlockFrequencyInfo *Graph) {
+    std::string Result;
+    raw_string_ostream OS(Result);
+
+    OS << Node->getName().str() << ":";
+    switch (ViewBlockFreqPropagationDAG) {
+    case GVDT_Fraction:
+      Graph->printBlockFreq(OS, Node);
+      break;
+    case GVDT_Integer:
+      OS << Graph->getBlockFreq(Node).getFrequency();
+      break;
+    case GVDT_None:
+      llvm_unreachable("If we are not supposed to render a graph we should "
+                       "never reach this point.");
+    }
+
+    return Result;
+  }
+};
+
+} // end namespace llvm
+#endif
+
+INITIALIZE_PASS_BEGIN(BlockFrequencyInfo, "block-freq",
+                      "Block Frequency Analysis", true, true)
+INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfo)
+INITIALIZE_PASS_DEPENDENCY(LoopInfo)
+INITIALIZE_PASS_END(BlockFrequencyInfo, "block-freq",
+                    "Block Frequency Analysis", true, true)
+
+char BlockFrequencyInfo::ID = 0;
+
+
+BlockFrequencyInfo::BlockFrequencyInfo() : FunctionPass(ID) {
+  initializeBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
+}
+
+BlockFrequencyInfo::~BlockFrequencyInfo() {}
+
+void BlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<BranchProbabilityInfo>();
+  AU.addRequired<LoopInfo>();
+  AU.setPreservesAll();
+}
+
+bool BlockFrequencyInfo::runOnFunction(Function &F) {
+  BranchProbabilityInfo &BPI = getAnalysis<BranchProbabilityInfo>();
+  LoopInfo &LI = getAnalysis<LoopInfo>();
+  if (!BFI)
+    BFI.reset(new ImplType);
+  BFI->doFunction(&F, &BPI, &LI);
+#ifndef NDEBUG
+  if (ViewBlockFreqPropagationDAG != GVDT_None)
+    view();
+#endif
+  return false;
+}
+
+void BlockFrequencyInfo::releaseMemory() { BFI.reset(); }
+
+void BlockFrequencyInfo::print(raw_ostream &O, const Module *) const {
+  if (BFI) BFI->print(O);
+}
+
+BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {
+  return BFI ? BFI->getBlockFreq(BB) : 0;
+}
+
+/// Pop up a ghostview window with the current block frequency propagation
+/// rendered using dot.
+void BlockFrequencyInfo::view() const {
+// This code is only for debugging.
+#ifndef NDEBUG
+  ViewGraph(const_cast<BlockFrequencyInfo *>(this), "BlockFrequencyDAGs");
+#else
+  errs() << "BlockFrequencyInfo::view is only available in debug builds on "
+            "systems with Graphviz or gv!\n";
+#endif // NDEBUG
+}
+
+const Function *BlockFrequencyInfo::getFunction() const {
+  return BFI ? BFI->getFunction() : nullptr;
+}
+
+raw_ostream &BlockFrequencyInfo::
+printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const {
+  return BFI ? BFI->printBlockFreq(OS, Freq) : OS;
+}
+
+raw_ostream &
+BlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
+                                   const BasicBlock *BB) const {
+  return BFI ? BFI->printBlockFreq(OS, BB) : OS;
+}
+
+uint64_t BlockFrequencyInfo::getEntryFreq() const {
+  return BFI ? BFI->getEntryFreq() : 0;
+}