llvm.org GIT mirror llvm / master lib / Transforms / Utils / ImportedFunctionsInliningStatistics.cpp
master

Tree @master (Download .tar.gz)

ImportedFunctionsInliningStatistics.cpp @master

d7e3771
 
6b54768
 
 
d7e3771
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
114087c
2aeb54d
d7e3771
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
c2a3bce
 
 
 
 
 
 
 
d7e3771
 
 
 
 
cf5d3ca
 
d7e3771
2aeb54d
d7e3771
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
c2a3bce
 
d7e3771
 
c2a3bce
d7e3771
 
c2a3bce
d7e3771
 
 
c2a3bce
d7e3771
 
 
 
c2a3bce
 
 
d7e3771
c2a3bce
d7e3771
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3b35e17
d7e3771
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
c2a3bce
 
d7e3771
c466264
 
 
 
 
 
 
 
 
d7e3771
 
//===-- ImportedFunctionsInliningStats.cpp ----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Generating inliner statistics for imported functions, mostly useful for
// ThinLTO.
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Utils/ImportedFunctionsInliningStatistics.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <iomanip>
#include <sstream>
using namespace llvm;

ImportedFunctionsInliningStatistics::InlineGraphNode &
ImportedFunctionsInliningStatistics::createInlineGraphNode(const Function &F) {

  auto &ValueLookup = NodesMap[F.getName()];
  if (!ValueLookup) {
    ValueLookup = std::make_unique<InlineGraphNode>();
    ValueLookup->Imported = F.hasMetadata("thinlto_src_module");
  }
  return *ValueLookup;
}

void ImportedFunctionsInliningStatistics::recordInline(const Function &Caller,
                                                       const Function &Callee) {

  InlineGraphNode &CallerNode = createInlineGraphNode(Caller);
  InlineGraphNode &CalleeNode = createInlineGraphNode(Callee);
  CalleeNode.NumberOfInlines++;

  if (!CallerNode.Imported && !CalleeNode.Imported) {
    // Direct inline from not imported callee to not imported caller, so we
    // don't have to add this to graph. It might be very helpful if you wanna
    // get the inliner statistics in compile step where there are no imported
    // functions. In this case the graph would be empty.
    CalleeNode.NumberOfRealInlines++;
    return;
  }

  CallerNode.InlinedCallees.push_back(&CalleeNode);
  if (!CallerNode.Imported) {
    // We could avoid second lookup, but it would make the code ultra ugly.
    auto It = NodesMap.find(Caller.getName());
    assert(It != NodesMap.end() && "The node should be already there.");
    // Save Caller as a starting node for traversal. The string has to be one
    // from map because Caller can disappear (and function name with it).
    NonImportedCallers.push_back(It->first());
  }
}

void ImportedFunctionsInliningStatistics::setModuleInfo(const Module &M) {
  ModuleName = M.getName();
  for (const auto &F : M.functions()) {
    if (F.isDeclaration())
      continue;
    AllFunctions++;
    ImportedFunctions += int(F.hasMetadata("thinlto_src_module"));
  }
}
static std::string getStatString(const char *Msg, int32_t Fraction, int32_t All,
                                 const char *PercentageOfMsg,
                                 bool LineEnd = true) {
  double Result = 0;
  if (All != 0)
    Result = 100 * static_cast<double>(Fraction) / All;

  std::stringstream Str;
  Str << std::setprecision(4) << Msg << ": " << Fraction << " [" << Result
      << "% of " << PercentageOfMsg << "]";
  if (LineEnd)
    Str << "\n";
  return Str.str();
}

void ImportedFunctionsInliningStatistics::dump(const bool Verbose) {
  calculateRealInlines();
  NonImportedCallers.clear();

  int32_t InlinedImportedFunctionsCount = 0;
  int32_t InlinedNotImportedFunctionsCount = 0;

  int32_t InlinedImportedFunctionsToImportingModuleCount = 0;
  int32_t InlinedNotImportedFunctionsToImportingModuleCount = 0;

  const auto SortedNodes = getSortedNodes();
  std::string Out;
  Out.reserve(5000);
  raw_string_ostream Ostream(Out);

  Ostream << "------- Dumping inliner stats for [" << ModuleName
          << "] -------\n";

  if (Verbose)
    Ostream << "-- List of inlined functions:\n";

  for (const auto &Node : SortedNodes) {
    assert(Node->second->NumberOfInlines >= Node->second->NumberOfRealInlines);
    if (Node->second->NumberOfInlines == 0)
      continue;

    if (Node->second->Imported) {
      InlinedImportedFunctionsCount++;
      InlinedImportedFunctionsToImportingModuleCount +=
          int(Node->second->NumberOfRealInlines > 0);
    } else {
      InlinedNotImportedFunctionsCount++;
      InlinedNotImportedFunctionsToImportingModuleCount +=
          int(Node->second->NumberOfRealInlines > 0);
    }

    if (Verbose)
      Ostream << "Inlined "
              << (Node->second->Imported ? "imported " : "not imported ")
              << "function [" << Node->first() << "]"
              << ": #inlines = " << Node->second->NumberOfInlines
              << ", #inlines_to_importing_module = "
              << Node->second->NumberOfRealInlines << "\n";
  }

  auto InlinedFunctionsCount =
      InlinedImportedFunctionsCount + InlinedNotImportedFunctionsCount;
  auto NotImportedFuncCount = AllFunctions - ImportedFunctions;
  auto ImportedNotInlinedIntoModule =
      ImportedFunctions - InlinedImportedFunctionsToImportingModuleCount;

  Ostream << "-- Summary:\n"
          << "All functions: " << AllFunctions
          << ", imported functions: " << ImportedFunctions << "\n"
          << getStatString("inlined functions", InlinedFunctionsCount,
                           AllFunctions, "all functions")
          << getStatString("imported functions inlined anywhere",
                           InlinedImportedFunctionsCount, ImportedFunctions,
                           "imported functions")
          << getStatString("imported functions inlined into importing module",
                           InlinedImportedFunctionsToImportingModuleCount,
                           ImportedFunctions, "imported functions",
                           /*LineEnd=*/false)
          << getStatString(", remaining", ImportedNotInlinedIntoModule,
                           ImportedFunctions, "imported functions")
          << getStatString("non-imported functions inlined anywhere",
                           InlinedNotImportedFunctionsCount,
                           NotImportedFuncCount, "non-imported functions")
          << getStatString(
                 "non-imported functions inlined into importing module",
                 InlinedNotImportedFunctionsToImportingModuleCount,
                 NotImportedFuncCount, "non-imported functions");
  Ostream.flush();
  dbgs() << Out;
}

void ImportedFunctionsInliningStatistics::calculateRealInlines() {
  // Removing duplicated Callers.
  llvm::sort(NonImportedCallers);
  NonImportedCallers.erase(
      std::unique(NonImportedCallers.begin(), NonImportedCallers.end()),
      NonImportedCallers.end());

  for (const auto &Name : NonImportedCallers) {
    auto &Node = *NodesMap[Name];
    if (!Node.Visited)
      dfs(Node);
  }
}

void ImportedFunctionsInliningStatistics::dfs(InlineGraphNode &GraphNode) {
  assert(!GraphNode.Visited);
  GraphNode.Visited = true;
  for (auto *const InlinedFunctionNode : GraphNode.InlinedCallees) {
    InlinedFunctionNode->NumberOfRealInlines++;
    if (!InlinedFunctionNode->Visited)
      dfs(*InlinedFunctionNode);
  }
}

ImportedFunctionsInliningStatistics::SortedNodesTy
ImportedFunctionsInliningStatistics::getSortedNodes() {
  SortedNodesTy SortedNodes;
  SortedNodes.reserve(NodesMap.size());
  for (const NodesMapTy::value_type& Node : NodesMap)
    SortedNodes.push_back(&Node);

  llvm::sort(SortedNodes, [&](const SortedNodesTy::value_type &Lhs,
                              const SortedNodesTy::value_type &Rhs) {
    if (Lhs->second->NumberOfInlines != Rhs->second->NumberOfInlines)
      return Lhs->second->NumberOfInlines > Rhs->second->NumberOfInlines;
    if (Lhs->second->NumberOfRealInlines != Rhs->second->NumberOfRealInlines)
      return Lhs->second->NumberOfRealInlines >
             Rhs->second->NumberOfRealInlines;
    return Lhs->first() < Rhs->first();
  });
  return SortedNodes;
}