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RTSA-lab01-CacheAnalysis
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first Version of Loop Unrolling

This commit is contained in:
Nils Hölscher 2022-05-03 11:13:37 +02:00
parent be3904a256
commit 5e6e0e6c90
4 changed files with 304 additions and 97 deletions
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4
.vscode/launch.json vendored
View File

@ -7,13 +7,13 @@
{
"type": "lldb",
"request": "launch",
"name": "LLDB cnt",
"name": "LLDB Unrolling",
"program": "/usr/bin/opt",
"args": [
"-load-pass-plugin",
"${workspaceFolder}/build/libCacheAnalysisPass.so",
"-passes=lru-misses",
"${workspaceFolder}/test/cnt.ll",
"${workspaceFolder}/test/fft1.ll",
"-o",
"/dev/null"
],

10
CacheAnalysisPass/CacheAnalysisPass.cpp
View File

@ -56,6 +56,7 @@ struct CacheAnalysisPass : PassInfoMixin<CacheAnalysisPass> {
bool PrintEdgesPost = false;
bool DumpToDot = true;
bool DumpNodes = false;
bool LoopUnrolling = true;
// Assume a 4kB Cache
// with 16 Sets, associativity of 4 and Cachelines fitting two
@ -228,14 +229,15 @@ struct CacheAnalysisPass : PassInfoMixin<CacheAnalysisPass> {
if (PrintAddresses)
addressPrinter(F);
}
if(LoopUnrolling)
AC.unrollLoops();
AC.fillAbstractCache(EntryAddress);
if (DumpNodes)
AC.dumpNodes();
if (PrintEdgesPost)
AC.dumpEdges();
if (DumpToDot)
AC.dumpDotFile();
AC.unrollLoops();
AC.fillAbstractCache(EntryAddress);
if (DumpNodes)
AC.dumpNodes();
outs() << "MustHits: " << AC.collectHits() << "\n";
outs() << "MayMisses: " << AC.collectMisses() << "\n";
return PreservedAnalyses::all();

70
helper.sh
View File

@ -114,46 +114,36 @@ case $1 in
echo "Currently not available!"
echo "But please continue to implement the must join,"
echo "to the best of your abilities and check for updates!"
# run "fft1"
# echo "==== Correct fft1 ===="
# echo "MustHits: 16"
# echo "MayMisses: 280"
# echo
# run "bsort100"
# echo "==== Correct bsort100 ===="
# echo "MustHits: 1"
# echo "MayMisses: 41"
# echo
# run "lms"
# echo "==== Correct lms ===="
# echo "MustHits: 5"
# echo "MayMisses: 288"
# echo
# run "minver"
# echo "==== Correct minver ===="
# echo "MustHits: 6"
# echo "MayMisses: 224"
# echo
# run "qsort-exam"
# echo "==== Correct qsort-exam ===="
# echo "MustHits: 2"
# echo "MayMisses: 152"
# echo
# run "recursion"
# echo "==== Correct recursion ===="
# echo "MustHits: 8"
# echo "MayMisses: 8"
# echo
# run "select"
# echo "==== Correct select ===="
# echo "MustHits: 4"
# echo "MayMisses: 108"
# echo
# run "whet"
# echo "==== Correct whet ===="
# echo "MustHits: 5"
# echo "MayMisses: 265"
# echo
run "fft1"
echo "==== Correct fft1 ===="
echo "MustHits: 16"
echo "MayMisses: 280"
echo
run "cnt"
echo "==== Correct cnt ===="
echo "MustHits: x"
echo "MayMisses: xx"
echo
run "crc"
echo "==== Correct crc ===="
echo "MustHits: x"
echo "MayMisses: xx"
echo
run "duff"
echo "==== Correct duff ===="
echo "MustHits: x"
echo "MayMisses: xx"
echo
run "insertsort"
echo "==== Correct insertsort ===="
echo "MustHits: x"
echo "MayMisses: xx"
echo
run "matmult"
echo "==== Correct matmult ===="
echo "MustHits: x"
echo "MayMisses: x"
echo
;;
a | all)
clean

317
include/AbstractCache.h
View File

@ -30,7 +30,6 @@ public: // everything is public, because IDGAF
// map keys are instruction Addresses.
std::map<unsigned int, std::list<unsigned int>> Edges;
std::map<unsigned int, AbstractState> Nodes;
unsigned int NumberOfNodes = 0;
AbstractCache() {}
@ -46,9 +45,120 @@ public: // everything is public, because IDGAF
Nodes[Suc].Predecessors.push_back(Pre);
}
/**
* @brief Add an Edge to the AbstractStateGraph
*
* @param Pre
* @param Suc
*/
void removeEdge(unsigned int Pre, unsigned int Suc) {
Edges[Pre].remove(Suc);
Nodes[Pre].Successors.remove(Suc);
Nodes[Suc].Predecessors.remove(Pre);
}
/**
* @brief Add an Empty node @NodeAddr
*
* @param NodeAddr
* @return unsigned int
*/
unsigned int addEmptyNode(unsigned int NodeAddr) {
Nodes[NumberOfNodes++] = AbstractState(NodeAddr);
return NumberOfNodes;
int I = Nodes.size();
Nodes[I] = AbstractState(NodeAddr);
return I;
}
/**
* @brief Returns True if a path From -> To exists.
*
* @param From
* @param To
* @return true
* @return false
*/
bool findPath(unsigned int From, unsigned int To) {
std::map<unsigned int, bool> Visited;
Visited[From] = false;
bool Ret = false;
for (auto Visitor : Visited) {
if (!Visitor.second) {
for (unsigned int Next : Edges[Visitor.first]) {
if (Next == To) {
return true;
}
Visited[Next] = false;
}
}
Visited[Visitor.first] = true;
}
return false;
}
/**
* @brief Removes all Nested loops from the handed LoopBody
*
* @param LoopBodyIn
* @param OrigNodeToUnrolledNode
*/
void removeNestedLoops(
std::list<unsigned int> LoopBodyIn,
std::map<unsigned int, unsigned int> OrigNodeToUnrolledNode) {
unsigned int LoopHead = LoopBodyIn.front();
unsigned int LoopTail = LoopBodyIn.back();
unsigned int NestLoopTail;
for (unsigned int NodeNr : LoopBodyIn) {
bool IsLoopHead = false;
bool FoundLoopBody = false;
unsigned int LoopBodySize = 0;
int NestLoopHead = 0;
NestLoopHead = NodeNr;
if (Nodes[NodeNr].Predecessors.size() > 1) {
IsLoopHead = true;
FoundLoopBody = false;
LoopBodySize++;
// is loop head?
for (unsigned int Pre : Nodes[NodeNr].Predecessors) {
if (Pre > NodeNr) {
// Might be loop head.
// check if all States between Pre and NodeNr are a coherent set.
for (unsigned int I = NodeNr; I < Pre; I++) {
// Check if all out going edges are in the set
for (unsigned int Succ : Nodes[I].Successors) {
if (Succ > Pre) {
// Set is not coherent
IsLoopHead = false;
break;
}
}
// check if all incoming edges are in the set.
if (IsLoopHead && I != NodeNr)
for (unsigned int Pred : Nodes[I].Predecessors) {
if (Pred < NodeNr) {
// Set is not coherent
IsLoopHead = false;
break;
}
}
FoundLoopBody = true;
LoopBodySize++;
}
NestLoopTail = Pre;
} else if (!FoundLoopBody) {
// If no coherent Loopbody exist we cannot unroll.
NestLoopHead = 0;
IsLoopHead = false;
}
if (FoundLoopBody) {
// Check if a Path between Head and Tail exists,
// if not its not a loop.
if (findPath(NestLoopHead, NestLoopTail))
removeEdge(OrigNodeToUnrolledNode[NestLoopTail],
OrigNodeToUnrolledNode[NestLoopHead]);
}
}
}
}
}
/**
@ -57,15 +167,23 @@ public: // everything is public, because IDGAF
* @param NodeNr
*/
void unrollLoops() {
for (auto NodePair : Nodes) {
unsigned int NodeNr = NodePair.first;
if (NodeNr == 34) {
llvm::outs() << "HI\n";
unsigned int NestedBorder = 0;
unsigned int LastNode = Nodes.size();
unsigned int IterationCounter = 0;
for (std::pair<const unsigned int, AbstractState> NodePair : Nodes) {
IterationCounter++;
if (NodePair.first == LastNode) {
break;
}
unsigned int NodeNr = NodePair.first;
// Don't unroll nested loops
if (NodeNr < NestedBorder)
continue;
bool IsLoopHead = false;
bool FoundLoopBody = false;
bool Verbose = true;
bool Verbose = false;
std::list<unsigned int> LoopBody;
std::list<unsigned int> AdditionalLoopTails;
if (Nodes[NodeNr].Predecessors.size() > 1) {
IsLoopHead = true;
// is loop head?
@ -73,15 +191,42 @@ public: // everything is public, because IDGAF
if (Pre > NodeNr) {
// Might be loop head.
// check if all States between Pre and NodeNr are a coherent set.
for (uint I = NodeNr; I < Pre; I++) {
LoopBody.push_back(I);
for (uint Succ : Nodes[I].Successors) {
if (Succ > Pre) {
// Set is not coherent
IsLoopHead = false;
break;
for (unsigned int I = NodeNr; I < Pre; I++) {
// Check if all out going edges are in the set
for (unsigned int Succ : Nodes[I].Successors) {
for (unsigned int PreI : Nodes[I].Predecessors) {
// Handle if we have multiple Loopheads.
if (PreI >= Pre && I != NodeNr) {
// I and Pre are Looptail.
{
if (std::find(AdditionalLoopTails.begin(),
AdditionalLoopTails.end(),
I) == AdditionalLoopTails.end()) {
AdditionalLoopTails.push_back(I);
break;
}
}
}
if (std::find(LoopBody.begin(), LoopBody.end(), I) ==
LoopBody.end())
LoopBody.push_back(I);
if (Succ > Pre) {
// Set is not coherent
IsLoopHead = false;
break;
}
}
}
// check if all incoming edges are in the set.
if (IsLoopHead && I != NodeNr)
for (unsigned int Pred : Nodes[I].Predecessors) {
if (Pred < NodeNr) {
// Set is not coherent
IsLoopHead = false;
break;
}
}
FoundLoopBody = true;
}
LoopBody.push_back(Pre);
@ -92,45 +237,91 @@ public: // everything is public, because IDGAF
}
}
}
if (IsLoopHead && Verbose) {
llvm::outs() << "Found LoopHead @: " << NodeNr << "\n";
llvm::outs() << "With Body: {\n";
int I = 1;
for (auto Node : LoopBody) {
llvm::outs() << Node << ", ";
if (!(I++ % 5)) {
llvm::outs() << "\n";
}
}
llvm::outs() << "}\n";
}
// Found Loop Head and Body!
// TODO: Now unroll
// Add empty unrolled Nodes
// Map points from OrigNode To Unrolled Node.
std::map<unsigned int, unsigned int> OrigNodeToUnrolledNode;
for (auto Node : LoopBody) {
// Node to unroll
AbstractState UnrolledNode(Nodes[Node]);
UnrolledNode.setUnrolled(1);
Nodes[NumberOfNodes++] = UnrolledNode;
OrigNodeToUnrolledNode[Node] = NumberOfNodes;
}
unsigned int LoopHead = LoopBody.front();
LoopBody.pop_front();
unsigned int LoopTail = LoopBody.back();
LoopBody.pop_back();
for (auto Node : LoopBody) {
for (auto Succ : Nodes[Node].Successors) {
// Add All successors to unrolled Node
Nodes[OrigNodeToUnrolledNode[Node]].Successors.push_back(
OrigNodeToUnrolledNode[Succ]);
if (FoundLoopBody) {
std::map<unsigned int, unsigned int> OrigNodeToUnrolledNode;
for (unsigned int Node : LoopBody) {
// Node to unroll
AbstractState UnrolledNode(Nodes[Node]);
UnrolledNode.setUnrolled(1);
unsigned int I = Nodes.size();
Nodes[I] = UnrolledNode;
OrigNodeToUnrolledNode[Node] = I;
assert(Nodes[OrigNodeToUnrolledNode[Node]].Unrolled == 1);
assert(Nodes[Node].Addr == Nodes[OrigNodeToUnrolledNode[Node]].Addr);
}
for (auto Pre : Nodes[Node].Predecessors) {
// Add All predecessors to unrolled Node
Nodes[OrigNodeToUnrolledNode[Node]].Successors.push_back(
OrigNodeToUnrolledNode[Pre]);
// LoopTail and Head have to be processed different
unsigned int LoopTail = LoopBody.back();
LoopBody.pop_back();
NestedBorder = LoopTail;
unsigned int LoopHead = LoopBody.front();
LoopBody.pop_front();
// Find State entering to LoopHead ()
unsigned int LoopHeadEntry = 0;
for (unsigned int Pre : Nodes[LoopHead].Predecessors) {
if (Pre < LoopHead) {
LoopHeadEntry = Pre;
break;
}
}
// Make LoopHeadEntry point to unrolled state instead of the loop.
addEdge(LoopHeadEntry, OrigNodeToUnrolledNode[LoopHead]);
removeEdge(LoopHeadEntry, LoopHead);
// Connect unrolled Loop to the the original Loop.
if (AdditionalLoopTails.size() == 0)
addEdge(OrigNodeToUnrolledNode[LoopTail], LoopHead);
for (auto Tail : AdditionalLoopTails)
addEdge(OrigNodeToUnrolledNode[Tail], LoopHead);
// Fix all other states
addEdge(OrigNodeToUnrolledNode[LoopBody.back()],
OrigNodeToUnrolledNode[LoopTail]);
for (unsigned int Node : LoopBody) {
for (unsigned int Pre : Nodes[Node].Predecessors) {
// if (std::find(LoopBody.begin(), LoopBody.end(), Pre) !=
// LoopBody.end())
// Add All predecessors and successors to unrolled Nodes
addEdge(OrigNodeToUnrolledNode[Pre], OrigNodeToUnrolledNode[Node]);
}
}
// Remove Nested loops in unrolled loop
removeNestedLoops(LoopBody, OrigNodeToUnrolledNode);
if (Verbose && FoundLoopBody) {
llvm::outs() << "Found LoopHead @: " << NodeNr << "\n";
llvm::outs() << "With LoopTail @: " << LoopTail << "\n";
llvm::outs() << "With Body: {\n";
int I = 1;
for (auto Node : LoopBody) {
llvm::outs() << Node << ", ";
if (!(I++ % 5)) {
llvm::outs() << "\n";
}
}
llvm::outs() << "}\n";
llvm::outs() << "Unrolled States: {\n";
I = 1;
for (auto Node : LoopBody) {
llvm::outs() << OrigNodeToUnrolledNode[Node] << ", ";
if (!(I++ % 5)) {
llvm::outs() << "\n";
}
}
llvm::outs() << "}\n";
I = 1;
llvm::outs() << "OrigNodeToUnrolledNode: {\n";
for (auto Nr : OrigNodeToUnrolledNode) {
llvm::outs() << Nr.first << "->" << Nr.second << ", ";
if (!(I++ % 3))
llvm::outs() << "\n";
}
llvm::outs() << "}\n";
}
}
}
@ -144,7 +335,6 @@ public: // everything is public, because IDGAF
*/
void fillAbstractCache(unsigned int NodeNr) {
// if(isLoopHead(NodeNr))
// unrollLoop(NodeNr);
Nodes[NodeNr].Computed = true;
for (unsigned int SuccNr : Nodes[NodeNr].Successors) {
Nodes[SuccNr];
@ -162,6 +352,11 @@ public: // everything is public, because IDGAF
return;
}
/**
* @brief Return number of measured Hits
*
* @return unsigned int
*/
unsigned int collectHits() {
unsigned int Hits = 0;
for (auto const &E : Edges) {
@ -174,6 +369,11 @@ public: // everything is public, because IDGAF
return Hits;
}
/**
* @brief Return number of measured Misses
*
* @return unsigned int
*/
unsigned int collectMisses() {
unsigned int Misses = 0;
for (auto const &E : Edges) {
@ -186,6 +386,10 @@ public: // everything is public, because IDGAF
return Misses;
}
/**
* @brief Prints all Edges to Console
*
*/
void dumpEdges() {
llvm::outs() << "Dumping Edges:\n";
for (auto const &E : Edges) {
@ -203,6 +407,10 @@ public: // everything is public, because IDGAF
}
}
/**
* @brief Dumps the Graph to a out.dot file
*
*/
void dumpDotFile() {
bool PrintOld = true;
std::ofstream DotFile;
@ -213,6 +421,9 @@ public: // everything is public, because IDGAF
for (unsigned int To : E.second) {
if (PrintOld) {
DotFile << E.first << " -> " << To << "\n";
if (Nodes[E.first].Unrolled) {
DotFile << E.first << " [color = red]\n";
}
} else {
DotFile << Nodes[E.first].Addr << "." << Nodes[E.first].Unrolled
<< " -> " << Nodes[To].Addr << "." << Nodes[To].Unrolled
@ -224,6 +435,10 @@ public: // everything is public, because IDGAF
DotFile.close();
}
/**
* @brief Prints all nodes to Console
*
*/
void dumpNodes() {
for (auto const &E : Edges) {
Nodes[E.first].dump();