1 files changed, 193 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp b/contrib/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
new file mode 100644
index 0000000..9151d99
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
@@ -0,0 +1,193 @@
+//===- MachineBlockFrequencyInfo.cpp - MBB 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/CodeGen/MachineBlockFrequencyInfo.h"
+#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
+#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/CodeGen/Passes.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>
+ViewMachineBlockFreqPropagationDAG("view-machine-block-freq-propagation-dags",
+                                   cl::Hidden,
+          cl::desc("Pop up a window to show a dag displaying how machine block "
+                   "frequencies propagate 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<MachineBlockFrequencyInfo *> {
+  typedef const MachineBasicBlock NodeType;
+  typedef MachineBasicBlock::const_succ_iterator ChildIteratorType;
+  typedef MachineFunction::const_iterator nodes_iterator;
+
+  static inline
+  const NodeType *getEntryNode(const MachineBlockFrequencyInfo *G) {
+    return G->getFunction()->begin();
+  }
+
+  static ChildIteratorType child_begin(const NodeType *N) {
+    return N->succ_begin();
+  }
+
+  static ChildIteratorType child_end(const NodeType *N) {
+    return N->succ_end();
+  }
+
+  static nodes_iterator nodes_begin(const MachineBlockFrequencyInfo *G) {
+    return G->getFunction()->begin();
+  }
+
+  static nodes_iterator nodes_end(const MachineBlockFrequencyInfo *G) {
+    return G->getFunction()->end();
+  }
+};
+
+template<>
+struct DOTGraphTraits<MachineBlockFrequencyInfo*> :
+    public DefaultDOTGraphTraits {
+  explicit DOTGraphTraits(bool isSimple=false) :
+    DefaultDOTGraphTraits(isSimple) {}
+
+  static std::string getGraphName(const MachineBlockFrequencyInfo *G) {
+    return G->getFunction()->getName();
+  }
+
+  std::string getNodeLabel(const MachineBasicBlock *Node,
+                           const MachineBlockFrequencyInfo *Graph) {
+    std::string Result;
+    raw_string_ostream OS(Result);
+
+    OS << Node->getName().str() << ":";
+    switch (ViewMachineBlockFreqPropagationDAG) {
+    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(MachineBlockFrequencyInfo, "machine-block-freq",
+                      "Machine Block Frequency Analysis", true, true)
+INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
+INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
+INITIALIZE_PASS_END(MachineBlockFrequencyInfo, "machine-block-freq",
+                    "Machine Block Frequency Analysis", true, true)
+
+char MachineBlockFrequencyInfo::ID = 0;
+
+
+MachineBlockFrequencyInfo::
+MachineBlockFrequencyInfo() :MachineFunctionPass(ID) {
+  initializeMachineBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
+}
+
+MachineBlockFrequencyInfo::~MachineBlockFrequencyInfo() {}
+
+void MachineBlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<MachineBranchProbabilityInfo>();
+  AU.addRequired<MachineLoopInfo>();
+  AU.setPreservesAll();
+  MachineFunctionPass::getAnalysisUsage(AU);
+}
+
+bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {
+  MachineBranchProbabilityInfo &MBPI =
+      getAnalysis<MachineBranchProbabilityInfo>();
+  MachineLoopInfo &MLI = getAnalysis<MachineLoopInfo>();
+  if (!MBFI)
+    MBFI.reset(new ImplType);
+  MBFI->doFunction(&F, &MBPI, &MLI);
+#ifndef NDEBUG
+  if (ViewMachineBlockFreqPropagationDAG != GVDT_None) {
+    view();
+  }
+#endif
+  return false;
+}
+
+void MachineBlockFrequencyInfo::releaseMemory() { MBFI.reset(); }
+
+/// Pop up a ghostview window with the current block frequency propagation
+/// rendered using dot.
+void MachineBlockFrequencyInfo::view() const {
+// This code is only for debugging.
+#ifndef NDEBUG
+  ViewGraph(const_cast<MachineBlockFrequencyInfo *>(this),
+            "MachineBlockFrequencyDAGs");
+#else
+  errs() << "MachineBlockFrequencyInfo::view is only available in debug builds "
+    "on systems with Graphviz or gv!\n";
+#endif // NDEBUG
+}
+
+BlockFrequency MachineBlockFrequencyInfo::
+getBlockFreq(const MachineBasicBlock *MBB) const {
+  return MBFI ? MBFI->getBlockFreq(MBB) : 0;
+}
+
+const MachineFunction *MachineBlockFrequencyInfo::getFunction() const {
+  return MBFI ? MBFI->getFunction() : nullptr;
+}
+
+raw_ostream &
+MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
+                                          const BlockFrequency Freq) const {
+  return MBFI ? MBFI->printBlockFreq(OS, Freq) : OS;
+}
+
+raw_ostream &
+MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
+                                          const MachineBasicBlock *MBB) const {
+  return MBFI ? MBFI->printBlockFreq(OS, MBB) : OS;
+}
+
+uint64_t MachineBlockFrequencyInfo::getEntryFreq() const {
+  return MBFI ? MBFI->getEntryFreq() : 0;
+}