X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FMachineBlockFrequencyInfo.cpp;h=10b0e929f2bba04ef3c193a7fd9eec221587bea2;hb=6dc18d8d3a86509edf747a3cddcc0104ef710cc3;hp=583e9c4efd469fb968c19e8fa1ecb463d09a24d9;hpb=f55c1c85881afd65647bde5346f64d9685235c7c;p=oota-llvm.git

diff --git a/lib/CodeGen/MachineBlockFrequencyInfo.cpp b/lib/CodeGen/MachineBlockFrequencyInfo.cpp
index 583e9c4efd4..10b0e929f2b 100644
--- a/lib/CodeGen/MachineBlockFrequencyInfo.cpp
+++ b/lib/CodeGen/MachineBlockFrequencyInfo.cpp
@@ -1,4 +1,4 @@
-//====----- MachineBlockFrequencyInfo.cpp - Machine Block Frequency Analysis ----====//
+//===- MachineBlockFrequencyInfo.cpp - MBB Frequency Analysis -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -11,50 +11,183 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/InitializePasses.h"
-#include "llvm/Analysis/BlockFrequencyImpl.h"
 #include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
-#include "llvm/CodeGen/Passes.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) {
+MachineBlockFrequencyInfo::
+MachineBlockFrequencyInfo() :MachineFunctionPass(ID) {
   initializeMachineBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
-  MBFI = new BlockFrequencyImpl<MachineBasicBlock, MachineFunction,
-                                MachineBranchProbabilityInfo>();
 }
 
-MachineBlockFrequencyInfo::~MachineBlockFrequencyInfo() {
-  delete MBFI;
-}
+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>();
-  MBFI->doFunction(&F, &MBPI);
+  MachineBranchProbabilityInfo &MBPI =
+      getAnalysis<MachineBranchProbabilityInfo>();
+  MachineLoopInfo &MLI = getAnalysis<MachineLoopInfo>();
+  if (!MBFI)
+    MBFI.reset(new ImplType);
+  MBFI->calculate(F, MBPI, MLI);
+#ifndef NDEBUG
+  if (ViewMachineBlockFreqPropagationDAG != GVDT_None) {
+    view();
+  }
+#endif
   return false;
 }
 
-/// getblockFreq - Return block frequency. Return 0 if we don't have the
-/// information. Please note that initial frequency is equal to 1024. It means
-/// that we should not rely on the value itself, but only on the comparison to
-/// the other block frequencies. We do this to avoid using of floating points.
-///
-uint32_t MachineBlockFrequencyInfo::getBlockFreq(MachineBasicBlock *MBB) {
-  return MBFI->getBlockFreq(MBB);
+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;
 }