-//====----- MachineBlockFrequencyInfo.cpp - Machine Block Frequency Analysis ----====//
+//===- MachineBlockFrequencyInfo.cpp - MBB Frequency Analysis -------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#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->doFunction(&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;
}
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