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Diffstat (limited to 'contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp b/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp new file mode 100644 index 0000000..90b7a33 --- /dev/null +++ b/contrib/llvm/lib/Analysis/BlockFrequencyInfo.cpp @@ -0,0 +1,213 @@ +//===- BlockFrequencyInfo.cpp - Block 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/Analysis/BlockFrequencyInfo.h" +#include "llvm/Analysis/BlockFrequencyInfoImpl.h" +#include "llvm/Analysis/BranchProbabilityInfo.h" +#include "llvm/Analysis/LoopInfo.h" +#include "llvm/Analysis/Passes.h" +#include "llvm/IR/CFG.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> +ViewBlockFreqPropagationDAG("view-block-freq-propagation-dags", cl::Hidden, + cl::desc("Pop up a window to show a dag displaying how block " + "frequencies propagation 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<BlockFrequencyInfo *> { + typedef const BasicBlock NodeType; + typedef succ_const_iterator ChildIteratorType; + typedef Function::const_iterator nodes_iterator; + + static inline const NodeType *getEntryNode(const BlockFrequencyInfo *G) { + return &G->getFunction()->front(); + } + static ChildIteratorType child_begin(const NodeType *N) { + return succ_begin(N); + } + static ChildIteratorType child_end(const NodeType *N) { + return succ_end(N); + } + static nodes_iterator nodes_begin(const BlockFrequencyInfo *G) { + return G->getFunction()->begin(); + } + static nodes_iterator nodes_end(const BlockFrequencyInfo *G) { + return G->getFunction()->end(); + } +}; + +template<> +struct DOTGraphTraits<BlockFrequencyInfo*> : public DefaultDOTGraphTraits { + explicit DOTGraphTraits(bool isSimple=false) : + DefaultDOTGraphTraits(isSimple) {} + + static std::string getGraphName(const BlockFrequencyInfo *G) { + return G->getFunction()->getName(); + } + + std::string getNodeLabel(const BasicBlock *Node, + const BlockFrequencyInfo *Graph) { + std::string Result; + raw_string_ostream OS(Result); + + OS << Node->getName() << ":"; + switch (ViewBlockFreqPropagationDAG) { + 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 + +BlockFrequencyInfo::BlockFrequencyInfo() {} + +BlockFrequencyInfo::BlockFrequencyInfo(const Function &F, + const BranchProbabilityInfo &BPI, + const LoopInfo &LI) { + calculate(F, BPI, LI); +} + +void BlockFrequencyInfo::calculate(const Function &F, + const BranchProbabilityInfo &BPI, + const LoopInfo &LI) { + if (!BFI) + BFI.reset(new ImplType); + BFI->calculate(F, BPI, LI); +#ifndef NDEBUG + if (ViewBlockFreqPropagationDAG != GVDT_None) + view(); +#endif +} + +BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const { + return BFI ? BFI->getBlockFreq(BB) : 0; +} + +void BlockFrequencyInfo::setBlockFreq(const BasicBlock *BB, + uint64_t Freq) { + assert(BFI && "Expected analysis to be available"); + BFI->setBlockFreq(BB, Freq); +} + +/// Pop up a ghostview window with the current block frequency propagation +/// rendered using dot. +void BlockFrequencyInfo::view() const { +// This code is only for debugging. +#ifndef NDEBUG + ViewGraph(const_cast<BlockFrequencyInfo *>(this), "BlockFrequencyDAGs"); +#else + errs() << "BlockFrequencyInfo::view is only available in debug builds on " + "systems with Graphviz or gv!\n"; +#endif // NDEBUG +} + +const Function *BlockFrequencyInfo::getFunction() const { + return BFI ? BFI->getFunction() : nullptr; +} + +raw_ostream &BlockFrequencyInfo:: +printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const { + return BFI ? BFI->printBlockFreq(OS, Freq) : OS; +} + +raw_ostream & +BlockFrequencyInfo::printBlockFreq(raw_ostream &OS, + const BasicBlock *BB) const { + return BFI ? BFI->printBlockFreq(OS, BB) : OS; +} + +uint64_t BlockFrequencyInfo::getEntryFreq() const { + return BFI ? BFI->getEntryFreq() : 0; +} + +void BlockFrequencyInfo::releaseMemory() { BFI.reset(); } + +void BlockFrequencyInfo::print(raw_ostream &OS) const { + if (BFI) + BFI->print(OS); +} + + +INITIALIZE_PASS_BEGIN(BlockFrequencyInfoWrapperPass, "block-freq", + "Block Frequency Analysis", true, true) +INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass) +INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass) +INITIALIZE_PASS_END(BlockFrequencyInfoWrapperPass, "block-freq", + "Block Frequency Analysis", true, true) + +char BlockFrequencyInfoWrapperPass::ID = 0; + + +BlockFrequencyInfoWrapperPass::BlockFrequencyInfoWrapperPass() + : FunctionPass(ID) { + initializeBlockFrequencyInfoWrapperPassPass(*PassRegistry::getPassRegistry()); +} + +BlockFrequencyInfoWrapperPass::~BlockFrequencyInfoWrapperPass() {} + +void BlockFrequencyInfoWrapperPass::print(raw_ostream &OS, + const Module *) const { + BFI.print(OS); +} + +void BlockFrequencyInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const { + AU.addRequired<BranchProbabilityInfoWrapperPass>(); + AU.addRequired<LoopInfoWrapperPass>(); + AU.setPreservesAll(); +} + +void BlockFrequencyInfoWrapperPass::releaseMemory() { BFI.releaseMemory(); } + +bool BlockFrequencyInfoWrapperPass::runOnFunction(Function &F) { + BranchProbabilityInfo &BPI = + getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI(); + LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo(); + BFI.calculate(F, BPI, LI); + return false; +} |
