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/*========================== begin_copyright_notice ============================
Copyright (C) 2019-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
///
/// A collection of functions useful for navigating continuations after
/// shader splitting has happened.
///
//===----------------------------------------------------------------------===//
#include "ContinuationUtils.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/InstIterator.h>
#include <llvm/IR/Function.h>
#include <llvm/Support/GraphWriter.h>
#include "common/LLVMWarningsPop.hpp"
using namespace IGC;
using namespace llvm;
namespace IGC {
std::vector<Function*> getRootFunctions(CodeGenContext* Ctx, Module& M)
{
ModuleMetaData* modMD = Ctx->getModuleMetaData();
auto &FuncMD = modMD->FuncMD;
// The 'RootFunctions' are the original shaders, not including their
// continuations.
std::vector<Function*> RootFunctions;
for (auto &F : M)
{
if (F.isDeclaration())
continue;
auto Entry = FuncMD.find(&F);
if (Entry == FuncMD.end())
continue;
auto& MD = Entry->second;
bool IsRoot =
MD.functionType == FunctionTypeMD::KernelFunction ||
(MD.functionType == FunctionTypeMD::CallableShader &&
!IGC::isContinuation(MD));
if (IsRoot)
{
RootFunctions.push_back(&F);
}
}
return RootFunctions;
}
// Starting at a given function 'F', recursively walk all continuation calls
// to explore the "call graph" from this function to build the collection of
// continuations reachable from this point.
void getFuncGroup(const Function* F, ContMap &Map)
{
for (auto& I : instructions(*F))
{
if (auto* CI = dyn_cast<ContinuationHLIntrinsic>(&I))
{
uint32_t ID = CI->getContinuationID();
Function* ContFn = CI->getContinuationFn();
if (Map.insert(std::make_pair(ID, ContFn)).second)
{
getFuncGroup(ContFn, Map);
}
}
}
}
ContMap getFuncGroup(const Function* F)
{
ContMap Map;
getFuncGroup(F, Map);
return Map;
}
void ContinuationInfo::calculate(Function& RootFunc, const ContMap& Group)
{
NumContinuations = Group.size();
FillBlockMap.clear();
FillIntrinsicMap.clear();
FillBlockMap.reserve(Group.size());
DeadFills.clear();
SmallVector<Function*, 4> Funcs{ &RootFunc };
for (auto& Pair : Group)
Funcs.push_back(Pair.second);
for (auto* F : Funcs)
{
for (auto& BB : *F)
{
DenseMap<uint64_t, SpillValueIntrinsic*> Spills;
for (auto& I : BB)
{
if (auto* SI = dyn_cast<SpillValueIntrinsic>(&I))
{
Spills[SI->getOffset()] = SI;
}
else if (auto *CI = dyn_cast<ContinuationHLIntrinsic>(&I))
{
SuspendPoints[I.getFunction()].push_back(CI);
auto *ContFn = Group.find(CI->getContinuationID())->second;
auto* FillBlock = &ContFn->getEntryBlock();
FillBlockMap[FillBlock].push_back(&BB);
for (auto& I : *FillBlock)
{
if (auto* FI = dyn_cast<FillValueIntrinsic>(&I))
{
auto* SpillInst =
Spills.find(FI->getOffset())->second;
FillIntrinsicMap[FI].push_back(SpillInst);
}
}
break;
}
}
}
}
}
void ContinuationInfo::markDead(FillValueIntrinsic* FI)
{
DeadFills.insert(FI);
}
void ContinuationInfo::bulkUpdate()
{
FillIntrinsicMap.remove_if([&](auto &P) {
return DeadFills.count(P.first) != 0;
});
DeadFills.clear();
}
void ContinuationInfo::findSpillRoots(
Value* V,
VisitedSet& Visited,
RootSet& Roots) const
{
if (!Visited.insert(V).second)
return;
auto* FI = dyn_cast<FillValueIntrinsic>(V);
if (!FI)
{
Roots.insert(V);
return;
}
auto& Spills = FillIntrinsicMap.find(FI)->second;
for (auto* SI : Spills)
{
findSpillRoots(SI->getData(), Visited, Roots);
}
}
ContinuationInfo::RootSet ContinuationInfo::findSpillRoots(Value* V) const
{
VisitedSet Visited;
RootSet Roots;
findSpillRoots(V, Visited, Roots);
return Roots;
}
Value* ContinuationInfo::findUniqueSpillRoot(Value* V) const
{
auto Roots = findSpillRoots(V);
if (Roots.size() == 1)
return *Roots.begin();
return nullptr;
}
void ContinuationGraph::buildGraph(
llvm::Function* F,
ContinuationGraph::MapTy& Map)
{
if (Map.count(F) != 0)
return;
Mapping[F] = std::make_unique<ContinuationGraphNode>(F, this);
Map[F];
for (auto& I : instructions(*F))
{
if (auto* CI = dyn_cast<ContinuationHLIntrinsic>(&I))
{
Function* ContFn = CI->getContinuationFn();
buildGraph(ContFn, Map);
Map[F].push_back(Mapping[ContFn].get());
}
}
}
ContinuationGraph::ContinuationGraph(llvm::Function *F)
{
Mapping[F] = std::make_unique<ContinuationGraphNode>(F, this);
Root = Mapping[F].get();
buildGraph(F, AdjacencyMap);
for (auto& P : AdjacencyMap)
Nodes.push_back(Mapping[P.first].get());
}
void viewContinuationGraph(llvm::Function* F)
{
ContinuationGraph CG(F);
ViewGraph(CG, "continuation-graph");
}
} // namespace IGC
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