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/*========================== begin_copyright_notice ============================
Copyright (C) 2025 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "../AdaptorCommon/LivenessUtils/AllocationLivenessAnalyzer.h"
#include "llvm/PassRegistry.h"
#include "RTBuilder.h"
#include "RTStackFormat.h"
namespace llvm {
class Instruction;
class Function;
class PassRegistry;
class PHINode;
class StructType;
class Value;
} // namespace llvm
namespace IGC {
class CodeGenContext;
class InlineRaytracing : public AllocationLivenessAnalyzer {
public:
static char ID;
InlineRaytracing();
bool runOnFunction(llvm::Function &F) override;
void getAdditionalAnalysisUsage(llvm::AnalysisUsage &AU) const override;
llvm::StringRef getPassName() const override { return "InlineRaytracing"; }
private:
using LivenessDataMap = llvm::MapVector<llvm::Instruction *, LivenessData>;
CodeGenContext *m_pCGCtx = nullptr;
llvm::StructType *m_RQObjectType = nullptr;
uint32_t m_numSlotsUsed = 0;
void LowerIntrinsics(llvm::Function &F);
bool LowerAllocations(llvm::Function &F);
LivenessDataMap AnalyzeLiveness(llvm::Function &F, llvm::DominatorTree &DT, llvm::LoopInfo &LI);
void AssignSlots(llvm::Function &F, const LivenessDataMap &livenessDataMap);
void HandleOptimizationsAndSpills(llvm::Function &F, LivenessDataMap &livenessDataMap, llvm::DominatorTree &DT,
llvm::LoopInfo &LI);
void LowerSlotAssignments(llvm::Function &F);
void LowerStackPtrs(llvm::Function &F);
enum RQTraceRayCtrl : uint8_t {
TRACE_RAY_INITIAL = static_cast<uint8_t>(RTStackFormat::TraceRayCtrl::TRACE_RAY_INITIAL),
TRACE_RAY_INSTANCE = static_cast<uint8_t>(RTStackFormat::TraceRayCtrl::TRACE_RAY_INSTANCE),
TRACE_RAY_COMMIT = static_cast<uint8_t>(RTStackFormat::TraceRayCtrl::TRACE_RAY_COMMIT),
TRACE_RAY_CONTINUE = static_cast<uint8_t>(RTStackFormat::TraceRayCtrl::TRACE_RAY_CONTINUE),
TRACE_RAY_DONE = UINT8_MAX
};
enum Functions : uint8_t {
GET_STACK_POINTER_FROM_RQ_OBJECT,
GET_RQ_HANDLE_FROM_RQ_OJECT,
CREATE_RQ_OBJECT,
NUM_FUNCTIONS
};
enum CommittedDataLocation : bool { CommittedHit = 0, PotentialHit = 1 };
enum RQPackedDataBitOffsets : uint8_t {
Start = 0,
TraceRayCtrl = 8,
CommittedStatus = 10,
CandidateType = 11,
HasAcceptHitAndEndSearchFlag = 12,
CommittedDataLocation = 13,
};
std::array<llvm::Function *, NUM_FUNCTIONS> m_Functions = {nullptr};
// helper functions used when lowering intrinsics
llvm::Value *getAtIndexFromRayQueryObject(llvm::RTBuilder &IRB, llvm::Value *rqObject, uint32_t i) {
return IRB.CreateInBoundsGEP(m_RQObjectType, rqObject, {IRB.getInt32(0), IRB.getInt32(i)});
}
llvm::Value *getGlobalBufferPtr(llvm::RTBuilder &IRB, llvm::Value *rqObject) {
auto *slot = IRB.CreateLoad(IRB.getInt32Ty(), getAtIndexFromRayQueryObject(IRB, rqObject, 0));
return IRB.getGlobalBufferPtrForSlot(ADDRESS_SPACE_CONSTANT, slot);
}
struct UnpackedData {
llvm::Value *TraceRayCtrl = nullptr;
llvm::Value *CommittedStatus = nullptr;
llvm::Value *CandidateType = nullptr;
llvm::Value *HasAcceptHitAndEndSearchFlag = nullptr;
llvm::Value *CommittedDataLocation = nullptr;
};
UnpackedData getPackedData(llvm::RTBuilder &IRB, llvm::Value *rqObject) {
UnpackedData data;
auto *packedData = IRB.CreateLoad(IRB.getInt32Ty(), getAtIndexFromRayQueryObject(IRB, rqObject, 1));
auto iterator = {
std::make_tuple(&data.TraceRayCtrl, RQPackedDataBitOffsets::Start, RQPackedDataBitOffsets::TraceRayCtrl),
std::make_tuple(&data.CommittedStatus, RQPackedDataBitOffsets::TraceRayCtrl,
RQPackedDataBitOffsets::CommittedStatus),
std::make_tuple(&data.CandidateType, RQPackedDataBitOffsets::CommittedStatus,
RQPackedDataBitOffsets::CandidateType),
std::make_tuple(&data.HasAcceptHitAndEndSearchFlag, RQPackedDataBitOffsets::CandidateType,
RQPackedDataBitOffsets::HasAcceptHitAndEndSearchFlag),
std::make_tuple(&data.CommittedDataLocation, RQPackedDataBitOffsets::HasAcceptHitAndEndSearchFlag,
RQPackedDataBitOffsets::CommittedDataLocation),
};
for (auto [field, bitoffset, nextbitoffset] : iterator) {
*field =
IRB.CreateAnd({IRB.CreateLShr(packedData, bitoffset), IRB.getInt32((1 << (nextbitoffset - bitoffset)) - 1)});
}
return data;
}
void setPackedData(llvm::RTBuilder &IRB, llvm::Value *rqObject, const UnpackedData &data) {
auto iterator = {
std::make_tuple(&data.TraceRayCtrl, RQPackedDataBitOffsets::Start, RQPackedDataBitOffsets::TraceRayCtrl),
std::make_tuple(&data.CommittedStatus, RQPackedDataBitOffsets::TraceRayCtrl,
RQPackedDataBitOffsets::CommittedStatus),
std::make_tuple(&data.CandidateType, RQPackedDataBitOffsets::CommittedStatus,
RQPackedDataBitOffsets::CandidateType),
std::make_tuple(&data.HasAcceptHitAndEndSearchFlag, RQPackedDataBitOffsets::CandidateType,
RQPackedDataBitOffsets::HasAcceptHitAndEndSearchFlag),
std::make_tuple(&data.CommittedDataLocation, RQPackedDataBitOffsets::HasAcceptHitAndEndSearchFlag,
RQPackedDataBitOffsets::CommittedDataLocation),
};
llvm::Value *packedData = IRB.getInt32(0);
for (auto [field, bitoffset, nextbitoffset] : iterator) {
packedData = IRB.CreateOr(
packedData, IRB.CreateShl(IRB.CreateAnd(*field, (1 << (nextbitoffset - bitoffset)) - 1), bitoffset));
}
IRB.CreateStore(packedData, getAtIndexFromRayQueryObject(IRB, rqObject, 1));
}
llvm::RTBuilder::SyncStackPointerVal *getStackPtr(llvm::RTBuilder &IRB, llvm::Value *rqObject) {
return static_cast<llvm::RTBuilder::SyncStackPointerVal *>(
llvm::cast<llvm::Value>(IRB.CreateCall(m_Functions[GET_STACK_POINTER_FROM_RQ_OBJECT], rqObject)));
}
void EmitPreTraceRayFence(llvm::RTBuilder &IRB, llvm::Value *rqObject);
void InsertCacheControl(llvm::RTBuilder &IRB, llvm::RTBuilder::SyncStackPointerVal *stackPtr);
void StopAndStartRayquery(llvm::RTBuilder &IRB, llvm::Instruction *I, llvm::Value *rqObject, bool doSpillFill,
bool doRQCheckRelease);
};
llvm::Pass *createInlineRaytracing();
} // namespace IGC
void initializeInlineRaytracingPass(llvm::PassRegistry &);
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