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RTSA-lab01-CacheAnalysis
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WIP

This commit is contained in:
Nils Hölscher 2022-04-29 14:31:08 +02:00
parent 1a9c1ccefb
commit be3904a256
4 changed files with 151 additions and 59 deletions
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15
.vscode/launch.json vendored
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@ -4,6 +4,21 @@
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"type": "lldb",
"request": "launch",
"name": "LLDB cnt",
"program": "/usr/bin/opt",
"args": [
"-load-pass-plugin",
"${workspaceFolder}/build/libCacheAnalysisPass.so",
"-passes=lru-misses",
"${workspaceFolder}/test/cnt.ll",
"-o",
"/dev/null"
],
"cwd": "${workspaceFolder}"
},
{
"type": "lldb",
"request": "launch",

49
CacheAnalysisPass/CacheAnalysisPass.cpp
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@ -46,52 +46,6 @@ using namespace llvm;
// everything in an anonymous namespace.
namespace {
std::string typeToName(Type::TypeID Id) {
switch (Id) {
case Type::TypeID::ArrayTyID:
return "ArrayTy";
case Type::TypeID::BFloatTyID:
return "BFloatTy";
case Type::TypeID::FloatTyID:
return "FloatTy";
case Type::TypeID::DoubleTyID:
return "DoubleTy";
case Type::TypeID::FixedVectorTyID:
return "FixedVectorTy";
case Type::TypeID::FP128TyID:
return "FP128Ty";
case Type::TypeID::FunctionTyID:
return "FunctionTy";
case Type::TypeID::HalfTyID:
return "HalfTy";
case Type::TypeID::IntegerTyID:
return "IntegerTy";
case Type::TypeID::LabelTyID:
return "LabelTy";
case Type::TypeID::MetadataTyID:
return "MetadataTy";
case Type::TypeID::PointerTyID:
return "PointerTy";
case Type::TypeID::PPC_FP128TyID:
return "PPC_FP128Ty";
case Type::TypeID::ScalableVectorTyID:
return "ScalableVectorTy";
case Type::TypeID::StructTyID:
return "StructTy";
case Type::TypeID::TokenTyID:
return "TokenTy";
case Type::TypeID::VoidTyID:
return "VoidTy";
case Type::TypeID::X86_AMXTyID:
return "X86_AMXTy";
case Type::TypeID::X86_FP80TyID:
return "X86_FP80Ty";
case Type::TypeID::X86_MMXTyID:
return "X86_MMXTy";
}
// should not reach here
return nullptr;
}
// New PM implementation
struct CacheAnalysisPass : PassInfoMixin<CacheAnalysisPass> {
@ -100,7 +54,7 @@ struct CacheAnalysisPass : PassInfoMixin<CacheAnalysisPass> {
bool PrintAddresses = false;
bool PrintEdges = false;
bool PrintEdgesPost = false;
bool DumpToDot = false;
bool DumpToDot = true;
bool DumpNodes = false;
// Assume a 4kB Cache
@ -278,6 +232,7 @@ struct CacheAnalysisPass : PassInfoMixin<CacheAnalysisPass> {
AC.dumpEdges();
if (DumpToDot)
AC.dumpDotFile();
AC.unrollLoops();
AC.fillAbstractCache(EntryAddress);
if (DumpNodes)
AC.dumpNodes();

110
include/AbstractCache.h
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@ -6,6 +6,7 @@
#include <cstddef>
#include <fstream>
#include <iostream>
#include <list>
#include <map>
#include <ostream>
#include <utility>
@ -29,6 +30,7 @@ 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() {}
@ -44,17 +46,112 @@ public: // everything is public, because IDGAF
Nodes[Suc].Predecessors.push_back(Pre);
}
void addEmptyNode(unsigned int NodeAddr) {
Nodes[NodeAddr] = AbstractState(NodeAddr);
unsigned int addEmptyNode(unsigned int NodeAddr) {
Nodes[NumberOfNodes++] = AbstractState(NodeAddr);
return NumberOfNodes;
}
/**
* @brief Unroll Loops.
*
* @param NodeNr
*/
void unrollLoops() {
for (auto NodePair : Nodes) {
unsigned int NodeNr = NodePair.first;
if (NodeNr == 34) {
llvm::outs() << "HI\n";
}
bool IsLoopHead = false;
bool FoundLoopBody = false;
bool Verbose = true;
std::list<unsigned int> LoopBody;
if (Nodes[NodeNr].Predecessors.size() > 1) {
IsLoopHead = true;
// 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 (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;
}
}
FoundLoopBody = true;
}
LoopBody.push_back(Pre);
} else if (!FoundLoopBody) {
// If no coherent Loopbody exist we cannot unroll.
LoopBody.clear();
IsLoopHead = false;
}
}
}
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]);
}
for (auto Pre : Nodes[Node].Predecessors) {
// Add All predecessors to unrolled Node
Nodes[OrigNodeToUnrolledNode[Node]].Successors.push_back(
OrigNodeToUnrolledNode[Pre]);
}
}
}
return;
}
/**
* @brief Idea fill the graph with the node and perform loop unrolling.
*
* @param NodeNr
*/
void fillAbstractCache(unsigned int NodeNr) {
// if(isLoopHead(NodeNr))
// unrollLoop(NodeNr);
Nodes[NodeNr].Computed = true;
for (unsigned int SuccNr : Nodes[NodeNr].Successors) {
Nodes[SuccNr];
if (Nodes[SuccNr].Computed) {
// Join don't call
Nodes[SuccNr].mustJoin(Nodes[NodeNr]);
// TODO fix Join
Nodes[SuccNr].mustJoin(Nodes[NodeNr]); // maybe fill
Nodes[SuccNr].mustJoin(AbstractState(NodeNr));
} else {
// Update and fill Succ
@ -107,13 +204,20 @@ public: // everything is public, because IDGAF
}
void dumpDotFile() {
bool PrintOld = true;
std::ofstream DotFile;
DotFile.open("out.dot");
DotFile << "digraph g {"
<< "\n";
for (auto const &E : Edges) {
for (unsigned int To : E.second) {
if (PrintOld) {
DotFile << E.first << " -> " << To << "\n";
} else {
DotFile << Nodes[E.first].Addr << "." << Nodes[E.first].Unrolled
<< " -> " << Nodes[To].Addr << "." << Nodes[To].Unrolled
<< "\n";
}
}
}
DotFile << "}\n";

34
include/AbstractState.h
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@ -27,6 +27,7 @@ public: // everything is public, because IDGAF
std::list<unsigned int> Predecessors;
unsigned int Addr;
unsigned int Unrolled;
bool Computed = false;
@ -57,6 +58,8 @@ public: // everything is public, because IDGAF
std::map<unsigned int, Set> Sets;
AbstractState(AbstractState const &Copy) {
Addr = Copy.Addr;
Unrolled = Copy.Unrolled;
for (auto S : Copy.Sets) {
unsigned int SetNr = S.first;
for (auto E : S.second.Associativity) {
@ -70,12 +73,22 @@ public: // everything is public, because IDGAF
AbstractState() {}
AbstractState(unsigned int AddressIn) { Addr = AddressIn; }
AbstractState(Address Addr) {
Sets[Addr.Index].Associativity[0] = {{Addr.Tag}};
AbstractState(unsigned int AddressIn) {
Addr = AddressIn;
Unrolled = 0;
}
AbstractState(unsigned int AddressIn, unsigned int UnrolledIn) {
Addr = AddressIn;
Unrolled = UnrolledIn;
}
// AbstractState(Address Addr) {
// Sets[Addr.Index].Associativity[0] = {{Addr.Tag}};
// }
void setUnrolled(unsigned int In) { Unrolled = In; }
/**
* @brief Executes an Must LRU Join on the AbstractCacheState
*
@ -111,9 +124,11 @@ public: // everything is public, because IDGAF
* @param Addr , Address
*/
void update(Address Addr) {
// This loopages all entries by one. 3 <-2, 2<-1, 1<-0
for (int I = 3; I > 0; I--) {
Sets[Addr.Index].Associativity[I] = Sets[Addr.Index].Associativity[I - 1];
}
// entry at age 0 is updated with current address.
Sets[Addr.Index].Associativity[0].Blocks = {Addr.Tag};
}
@ -126,7 +141,7 @@ public: // everything is public, because IDGAF
for (auto S : UpdateState.Sets) {
unsigned int Index = S.first;
for (auto E : S.second.Associativity) {
unsigned int Age = E.first + 1;
unsigned int Age = E.first;
// If updated age is greater 4 The Tag is no longer in Cache.
// Due to associativity of 4 per set.
if (Age >= 4)
@ -139,17 +154,18 @@ public: // everything is public, because IDGAF
}
/**
* @brief Fills the AbstractState PreState and PreAddress.
* @brief Fills the AbstractState PreState and updates with PreAddress.
*
* @param PreState, State that fills this state.
*
* @param PreAddr Address of PreState
*/
void fill(AbstractState PreState, Address PreAddr) {
// copy Pre State into this.
for (auto S : PreState.Sets) {
unsigned int Index = S.first;
for (auto E : S.second.Associativity) {
unsigned int Age = E.first + 1;
unsigned int Age = E.first;
// If updated age is greater 4 The Tag is no longer in Cache.
// Due to associativity of 4 per set.
if (Age >= 4)
@ -159,11 +175,13 @@ public: // everything is public, because IDGAF
}
}
}
Sets[PreAddr.Index].Associativity[0].Blocks.push_back(PreAddr.Tag);
// update this with PreAddr
this->update(PreAddr);
}
void dump() {
llvm::outs() << Addr << " {\n";
llvm::outs() << "Unrolled: " << Unrolled << "\n";
llvm::outs() << "Predecessors: ";
for (auto PreNr : Predecessors) {
llvm::outs() << PreNr << " ";