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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233392 91177308-0d34-0410-b5e6-96231b3b80d8
183 lines
5.5 KiB
C++
183 lines
5.5 KiB
C++
//===- BlockFrequencyInfo.cpp - Block 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/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/IR/CFG.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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ViewBlockFreqPropagationDAG("view-block-freq-propagation-dags", cl::Hidden,
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cl::desc("Pop up a window to show a dag displaying how block "
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"frequencies propagation 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<BlockFrequencyInfo *> {
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typedef const BasicBlock NodeType;
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typedef succ_const_iterator ChildIteratorType;
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typedef Function::const_iterator nodes_iterator;
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static inline const NodeType *getEntryNode(const BlockFrequencyInfo *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 succ_begin(N);
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}
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static ChildIteratorType child_end(const NodeType *N) {
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return succ_end(N);
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}
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static nodes_iterator nodes_begin(const BlockFrequencyInfo *G) {
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return G->getFunction()->begin();
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}
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static nodes_iterator nodes_end(const BlockFrequencyInfo *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<BlockFrequencyInfo*> : 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 BlockFrequencyInfo *G) {
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return G->getFunction()->getName();
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}
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std::string getNodeLabel(const BasicBlock *Node,
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const BlockFrequencyInfo *Graph) {
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std::string Result;
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raw_string_ostream OS(Result);
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OS << Node->getName() << ":";
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switch (ViewBlockFreqPropagationDAG) {
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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(BlockFrequencyInfo, "block-freq",
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"Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfo)
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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INITIALIZE_PASS_END(BlockFrequencyInfo, "block-freq",
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"Block Frequency Analysis", true, true)
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char BlockFrequencyInfo::ID = 0;
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BlockFrequencyInfo::BlockFrequencyInfo() : FunctionPass(ID) {
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initializeBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
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}
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BlockFrequencyInfo::~BlockFrequencyInfo() {}
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void BlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<BranchProbabilityInfo>();
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AU.addRequired<LoopInfoWrapperPass>();
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AU.setPreservesAll();
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}
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bool BlockFrequencyInfo::runOnFunction(Function &F) {
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BranchProbabilityInfo &BPI = getAnalysis<BranchProbabilityInfo>();
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LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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if (!BFI)
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BFI.reset(new ImplType);
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BFI->doFunction(&F, &BPI, &LI);
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#ifndef NDEBUG
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if (ViewBlockFreqPropagationDAG != GVDT_None)
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view();
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#endif
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return false;
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}
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void BlockFrequencyInfo::releaseMemory() { BFI.reset(); }
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void BlockFrequencyInfo::print(raw_ostream &O, const Module *) const {
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if (BFI) BFI->print(O);
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}
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BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {
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return BFI ? BFI->getBlockFreq(BB) : 0;
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}
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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 BlockFrequencyInfo::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<BlockFrequencyInfo *>(this), "BlockFrequencyDAGs");
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#else
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errs() << "BlockFrequencyInfo::view is only available in debug builds on "
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"systems with Graphviz or gv!\n";
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#endif // NDEBUG
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}
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const Function *BlockFrequencyInfo::getFunction() const {
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return BFI ? BFI->getFunction() : nullptr;
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}
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raw_ostream &BlockFrequencyInfo::
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printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const {
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return BFI ? BFI->printBlockFreq(OS, Freq) : OS;
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}
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raw_ostream &
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BlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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const BasicBlock *BB) const {
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return BFI ? BFI->printBlockFreq(OS, BB) : OS;
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}
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uint64_t BlockFrequencyInfo::getEntryFreq() const {
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return BFI ? BFI->getEntryFreq() : 0;
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}
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