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8dd8d5c2b2
Temporarily back out commits r211749, r211752 and r211754. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211814 91177308-0d34-0410-b5e6-96231b3b80d8
194 lines
6.0 KiB
C++
194 lines
6.0 KiB
C++
//===- MachineBlockFrequencyInfo.cpp - MBB Frequency Analysis -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Loops should be simplified before this analysis.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
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#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/GraphWriter.h"
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using namespace llvm;
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#define DEBUG_TYPE "block-freq"
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#ifndef NDEBUG
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enum GVDAGType {
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GVDT_None,
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GVDT_Fraction,
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GVDT_Integer
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};
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static cl::opt<GVDAGType>
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ViewMachineBlockFreqPropagationDAG("view-machine-block-freq-propagation-dags",
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cl::Hidden,
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cl::desc("Pop up a window to show a dag displaying how machine block "
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"frequencies propagate through the CFG."),
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cl::values(
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clEnumValN(GVDT_None, "none",
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"do not display graphs."),
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clEnumValN(GVDT_Fraction, "fraction", "display a graph using the "
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"fractional block frequency representation."),
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clEnumValN(GVDT_Integer, "integer", "display a graph using the raw "
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"integer fractional block frequency representation."),
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clEnumValEnd));
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namespace llvm {
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template <>
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struct GraphTraits<MachineBlockFrequencyInfo *> {
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typedef const MachineBasicBlock NodeType;
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typedef MachineBasicBlock::const_succ_iterator ChildIteratorType;
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typedef MachineFunction::const_iterator nodes_iterator;
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static inline
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const NodeType *getEntryNode(const MachineBlockFrequencyInfo *G) {
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return G->getFunction()->begin();
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}
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static ChildIteratorType child_begin(const NodeType *N) {
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return N->succ_begin();
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}
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static ChildIteratorType child_end(const NodeType *N) {
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return N->succ_end();
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}
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static nodes_iterator nodes_begin(const MachineBlockFrequencyInfo *G) {
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return G->getFunction()->begin();
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}
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static nodes_iterator nodes_end(const MachineBlockFrequencyInfo *G) {
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return G->getFunction()->end();
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}
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};
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template<>
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struct DOTGraphTraits<MachineBlockFrequencyInfo*> :
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public DefaultDOTGraphTraits {
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explicit DOTGraphTraits(bool isSimple=false) :
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DefaultDOTGraphTraits(isSimple) {}
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static std::string getGraphName(const MachineBlockFrequencyInfo *G) {
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return G->getFunction()->getName();
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}
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std::string getNodeLabel(const MachineBasicBlock *Node,
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const MachineBlockFrequencyInfo *Graph) {
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std::string Result;
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raw_string_ostream OS(Result);
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OS << Node->getName().str() << ":";
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switch (ViewMachineBlockFreqPropagationDAG) {
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case GVDT_Fraction:
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Graph->printBlockFreq(OS, Node);
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break;
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case GVDT_Integer:
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OS << Graph->getBlockFreq(Node).getFrequency();
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break;
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case GVDT_None:
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llvm_unreachable("If we are not supposed to render a graph we should "
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"never reach this point.");
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}
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return Result;
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}
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};
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} // end namespace llvm
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#endif
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INITIALIZE_PASS_BEGIN(MachineBlockFrequencyInfo, "machine-block-freq",
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"Machine Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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INITIALIZE_PASS_END(MachineBlockFrequencyInfo, "machine-block-freq",
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"Machine Block Frequency Analysis", true, true)
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char MachineBlockFrequencyInfo::ID = 0;
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MachineBlockFrequencyInfo::
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MachineBlockFrequencyInfo() :MachineFunctionPass(ID) {
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initializeMachineBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
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}
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MachineBlockFrequencyInfo::~MachineBlockFrequencyInfo() {}
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void MachineBlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineBranchProbabilityInfo>();
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AU.addRequired<MachineLoopInfo>();
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {
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MachineBranchProbabilityInfo &MBPI =
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getAnalysis<MachineBranchProbabilityInfo>();
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MachineLoopInfo &MLI = getAnalysis<MachineLoopInfo>();
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if (!MBFI)
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MBFI.reset(new ImplType);
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MBFI->doFunction(&F, &MBPI, &MLI);
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#ifndef NDEBUG
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if (ViewMachineBlockFreqPropagationDAG != GVDT_None) {
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view();
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}
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#endif
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return false;
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}
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void MachineBlockFrequencyInfo::releaseMemory() { MBFI.reset(); }
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/// Pop up a ghostview window with the current block frequency propagation
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/// rendered using dot.
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void MachineBlockFrequencyInfo::view() const {
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// This code is only for debugging.
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#ifndef NDEBUG
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ViewGraph(const_cast<MachineBlockFrequencyInfo *>(this),
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"MachineBlockFrequencyDAGs");
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#else
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errs() << "MachineBlockFrequencyInfo::view is only available in debug builds "
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"on systems with Graphviz or gv!\n";
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#endif // NDEBUG
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}
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BlockFrequency MachineBlockFrequencyInfo::
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getBlockFreq(const MachineBasicBlock *MBB) const {
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return MBFI ? MBFI->getBlockFreq(MBB) : 0;
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}
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const MachineFunction *MachineBlockFrequencyInfo::getFunction() const {
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return MBFI ? MBFI->getFunction() : nullptr;
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}
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raw_ostream &
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MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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const BlockFrequency Freq) const {
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return MBFI ? MBFI->printBlockFreq(OS, Freq) : OS;
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}
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raw_ostream &
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MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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const MachineBasicBlock *MBB) const {
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return MBFI ? MBFI->printBlockFreq(OS, MBB) : OS;
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}
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uint64_t MachineBlockFrequencyInfo::getEntryFreq() const {
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return MBFI ? MBFI->getEntryFreq() : 0;
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}
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