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| //===- DDG.cpp - Data Dependence Graph -------------------------------------==//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// The implementation for the data dependence graph.
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DDG.h"
#include "llvm/Analysis/LoopInfo.h"
using namespace llvm;
#define DEBUG_TYPE "ddg"
template class llvm::DGEdge<DDGNode, DDGEdge>;
template class llvm::DGNode<DDGNode, DDGEdge>;
template class llvm::DirectedGraph<DDGNode, DDGEdge>;
//===--------------------------------------------------------------------===//
// DDGNode implementation
//===--------------------------------------------------------------------===//
DDGNode::~DDGNode() {}
bool DDGNode::collectInstructions(
llvm::function_ref<bool(Instruction *)> const &Pred,
InstructionListType &IList) const {
assert(IList.empty() && "Expected the IList to be empty on entry.");
if (isa<SimpleDDGNode>(this)) {
for (auto *I : cast<const SimpleDDGNode>(this)->getInstructions())
if (Pred(I))
IList.push_back(I);
} else
llvm_unreachable("unimplemented type of node");
return !IList.empty();
}
raw_ostream &llvm::operator<<(raw_ostream &OS, const DDGNode::NodeKind K) {
const char *Out;
switch (K) {
case DDGNode::NodeKind::SingleInstruction:
Out = "single-instruction";
break;
case DDGNode::NodeKind::MultiInstruction:
Out = "multi-instruction";
break;
case DDGNode::NodeKind::Root:
Out = "root";
break;
case DDGNode::NodeKind::Unknown:
Out = "??";
break;
}
OS << Out;
return OS;
}
raw_ostream &llvm::operator<<(raw_ostream &OS, const DDGNode &N) {
OS << "Node Address:" << &N << ":" << N.getKind() << "\n";
if (isa<SimpleDDGNode>(N)) {
OS << " Instructions:\n";
for (auto *I : cast<const SimpleDDGNode>(N).getInstructions())
OS.indent(2) << *I << "\n";
} else if (!isa<RootDDGNode>(N))
llvm_unreachable("unimplemented type of node");
OS << (N.getEdges().empty() ? " Edges:none!\n" : " Edges:\n");
for (auto &E : N.getEdges())
OS.indent(2) << *E;
return OS;
}
//===--------------------------------------------------------------------===//
// SimpleDDGNode implementation
//===--------------------------------------------------------------------===//
SimpleDDGNode::SimpleDDGNode(Instruction &I)
: DDGNode(NodeKind::SingleInstruction), InstList() {
assert(InstList.empty() && "Expected empty list.");
InstList.push_back(&I);
}
SimpleDDGNode::SimpleDDGNode(const SimpleDDGNode &N)
: DDGNode(N), InstList(N.InstList) {
assert(((getKind() == NodeKind::SingleInstruction && InstList.size() == 1) ||
(getKind() == NodeKind::MultiInstruction && InstList.size() > 1)) &&
"constructing from invalid simple node.");
}
SimpleDDGNode::SimpleDDGNode(SimpleDDGNode &&N)
: DDGNode(std::move(N)), InstList(std::move(N.InstList)) {
assert(((getKind() == NodeKind::SingleInstruction && InstList.size() == 1) ||
(getKind() == NodeKind::MultiInstruction && InstList.size() > 1)) &&
"constructing from invalid simple node.");
}
SimpleDDGNode::~SimpleDDGNode() { InstList.clear(); }
//===--------------------------------------------------------------------===//
// DDGEdge implementation
//===--------------------------------------------------------------------===//
raw_ostream &llvm::operator<<(raw_ostream &OS, const DDGEdge::EdgeKind K) {
const char *Out;
switch (K) {
case DDGEdge::EdgeKind::RegisterDefUse:
Out = "def-use";
break;
case DDGEdge::EdgeKind::MemoryDependence:
Out = "memory";
break;
case DDGEdge::EdgeKind::Rooted:
Out = "rooted";
break;
case DDGEdge::EdgeKind::Unknown:
Out = "??";
break;
}
OS << Out;
return OS;
}
raw_ostream &llvm::operator<<(raw_ostream &OS, const DDGEdge &E) {
OS << "[" << E.getKind() << "] to " << &E.getTargetNode() << "\n";
return OS;
}
//===--------------------------------------------------------------------===//
// DataDependenceGraph implementation
//===--------------------------------------------------------------------===//
using BasicBlockListType = SmallVector<BasicBlock *, 8>;
DataDependenceGraph::DataDependenceGraph(Function &F, DependenceInfo &D)
: DependenceGraphInfo(F.getName().str(), D) {
BasicBlockListType BBList;
for (auto &BB : F.getBasicBlockList())
BBList.push_back(&BB);
DDGBuilder(*this, D, BBList).populate();
}
DataDependenceGraph::DataDependenceGraph(const Loop &L, DependenceInfo &D)
: DependenceGraphInfo(Twine(L.getHeader()->getParent()->getName() + "." +
L.getHeader()->getName())
.str(),
D) {
BasicBlockListType BBList;
for (BasicBlock *BB : L.blocks())
BBList.push_back(BB);
DDGBuilder(*this, D, BBList).populate();
}
DataDependenceGraph::~DataDependenceGraph() {
for (auto *N : Nodes) {
for (auto *E : *N)
delete E;
delete N;
}
}
bool DataDependenceGraph::addNode(DDGNode &N) {
if (!DDGBase::addNode(N))
return false;
// In general, if the root node is already created and linked, it is not safe
// to add new nodes since they may be unreachable by the root.
// TODO: Allow adding Pi-block nodes after root is created. Pi-blocks are an
// exception because they represent components that are already reachable by
// root.
assert(!Root && "Root node is already added. No more nodes can be added.");
if (isa<RootDDGNode>(N))
Root = &N;
return true;
}
raw_ostream &llvm::operator<<(raw_ostream &OS, const DataDependenceGraph &G) {
for (auto *Node : G)
OS << *Node << "\n";
return OS;
}
//===--------------------------------------------------------------------===//
// DDG Analysis Passes
//===--------------------------------------------------------------------===//
/// DDG as a loop pass.
DDGAnalysis::Result DDGAnalysis::run(Loop &L, LoopAnalysisManager &AM,
LoopStandardAnalysisResults &AR) {
Function *F = L.getHeader()->getParent();
DependenceInfo DI(F, &AR.AA, &AR.SE, &AR.LI);
return std::make_unique<DataDependenceGraph>(L, DI);
}
AnalysisKey DDGAnalysis::Key;
PreservedAnalyses DDGAnalysisPrinterPass::run(Loop &L, LoopAnalysisManager &AM,
LoopStandardAnalysisResults &AR,
LPMUpdater &U) {
OS << "'DDG' for loop '" << L.getHeader()->getName() << "':\n";
OS << *AM.getResult<DDGAnalysis>(L, AR);
return PreservedAnalyses::all();
}
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