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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2023 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "llvm/Config/llvm-config.h"
#include "AdaptorCommon/RayTracing/RayTracingAddressSpaceAliasAnalysis.h"
#include "Compiler/Optimizer/OpenCLPasses/AddressSpaceAliasAnalysis/AddressSpaceAliasAnalysis.h"
#include "Compiler/CodeGenPublic.h"
#include "Compiler/IGCPassSupport.h"
#include "Probe/Assertion.h"
#include "common/LLVMWarningsPush.hpp"
#include "llvmWrapper/Analysis/AliasAnalysis.h"
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
namespace {
class AddressSpaceAAResult : public IGCLLVM::AAResultBaseWrapper<AddressSpaceAAResult> {
using BaseT = IGCLLVM::AAResultBaseWrapper<AddressSpaceAAResult>;
friend BaseT;
const TargetLibraryInfo &TLI;
const CodeGenContext &CGC;
public:
explicit AddressSpaceAAResult(const TargetLibraryInfo &TLI, const CodeGenContext &ctx)
: BaseT(), TLI(TLI), CGC(ctx) {}
AddressSpaceAAResult(AddressSpaceAAResult &&Arg) : BaseT(std::move(Arg)), TLI(Arg.TLI), CGC(Arg.CGC) {}
AddressSpaceAAResult(const AddressSpaceAAResult &) = delete;
AddressSpaceAAResult &operator=(const AddressSpaceAAResult &) = delete;
AddressSpaceAAResult &operator=(AddressSpaceAAResult &&) = delete;
IGCLLVM::AliasResultEnum alias(const MemoryLocation &LocA, const MemoryLocation &LocB, AAQueryInfo &AAQI,
#if LLVM_VERSION_MAJOR < 16
const llvm::Instruction *CtxI = nullptr
#else
const llvm::Instruction *CtxI
#endif
) {
// DO NOT strip any casting as the address space is encoded in pointer
// type. For `addrspacecast`, the current implementation in LLVM is too
// aggressive to strip them. With address space resolution, we should not
// have trivial cases where a non-generic pointer is cased into a generic
// one.
PointerType *PtrTy1 = dyn_cast<PointerType>(LocA.Ptr->getType());
PointerType *PtrTy2 = dyn_cast<PointerType>(LocB.Ptr->getType());
if (!PtrTy1 || !PtrTy2)
return IGCLLVM::AliasResultEnum::NoAlias;
unsigned AS1 = PtrTy1->getAddressSpace();
unsigned AS2 = PtrTy2->getAddressSpace();
// If LocA and LocB are pointers to different non-generic address spaces
// then they do not alias. This is not true in general, however, in OpenCL
// all address spaces except generic are disjoint.
//
// Address spaces greater than ADDRESS_SPACE_NUM_ADDRESSES are used for
// stateful accesses and may alias.
//
if (AS1 < ADDRESS_SPACE_NUM_ADDRESSES && AS2 < ADDRESS_SPACE_NUM_ADDRESSES && AS1 != ADDRESS_SPACE_GENERIC &&
AS2 != ADDRESS_SPACE_GENERIC && AS1 != AS2) {
bool isDisjointMemory = true;
if (CGC.allocatePrivateAsGlobalBuffer() && CGC.getModuleMetaData()->genericAccessesResolved) {
const bool isPrivateGlobal = (AS1 == ADDRESS_SPACE_PRIVATE && AS2 == ADDRESS_SPACE_GLOBAL) ||
(AS1 == ADDRESS_SPACE_GLOBAL && AS2 == ADDRESS_SPACE_PRIVATE);
isDisjointMemory = !isPrivateGlobal;
}
if (isDisjointMemory)
return IGCLLVM::AliasResultEnum::NoAlias;
}
// Shared local memory doesn't alias any stateful memory.
if ((AS1 == ADDRESS_SPACE_LOCAL && AS2 > ADDRESS_SPACE_NUM_ADDRESSES) ||
(AS1 > ADDRESS_SPACE_NUM_ADDRESSES && AS2 == ADDRESS_SPACE_LOCAL)) {
return IGCLLVM::AliasResultEnum::NoAlias;
}
// Private memory doesn't alias any stateful memory
if ((AS1 == ADDRESS_SPACE_PRIVATE && AS2 > ADDRESS_SPACE_NUM_ADDRESSES) ||
(AS1 > ADDRESS_SPACE_NUM_ADDRESSES && AS2 == ADDRESS_SPACE_PRIVATE)) {
return IGCLLVM::AliasResultEnum::NoAlias;
}
/// For some client APIs (e.g. vulkan) compiler is free to assume that
/// resources bound to two different bindings points never alias unless a
/// resource is explicitly marked as being aliased.
IGC_ASSERT(CGC.getModuleMetaData());
if (AS1 > ADDRESS_SPACE_NUM_ADDRESSES && AS2 > ADDRESS_SPACE_NUM_ADDRESSES &&
CGC.getModuleMetaData()->statefulResourcesNotAliased) {
bool isDirectAccess[2] = {false, false};
unsigned resourceIndex[2] = {0, 0};
BufferType resourceType[2] = {BUFFER_TYPE_UNKNOWN, BUFFER_TYPE_UNKNOWN};
resourceType[0] = DecodeAS4GFXResource(AS1, isDirectAccess[0], resourceIndex[0]);
resourceType[1] = DecodeAS4GFXResource(AS2, isDirectAccess[1], resourceIndex[1]);
/// Returns true if resource type is a texture, constant buffer or a storage buffer.
auto IsBufferOrTexture = [](BufferType type) {
return (type == BufferType::CONSTANT_BUFFER || type == BufferType::UAV || type == BufferType::RESOURCE);
};
if (IsBufferOrTexture(resourceType[0]) && IsBufferOrTexture(resourceType[1])) {
if ((resourceType[0] != resourceType[1]) || // different resource types
(isDirectAccess[0] && isDirectAccess[1] &&
resourceIndex[0] != resourceIndex[1])) // direct access to different BTIs
{
return IGCLLVM::AliasResultEnum::NoAlias;
}
}
}
return BaseT::alias(LocA, LocB, AAQI, CtxI);
}
bool pointsToConstantMemory(const llvm::MemoryLocation &Loc, AAQueryInfo &AAQI, bool OrLocal) {
// Pointers to constant address space memory, well, point to constant memory
PointerType *ptrType = dyn_cast<PointerType>(Loc.Ptr->getType());
if (ptrType) {
if (ptrType->getAddressSpace() == ADDRESS_SPACE_CONSTANT)
return true;
bool DirectIdx;
unsigned BufId;
BufferType BufTy = DecodeAS4GFXResource(ptrType->getAddressSpace(), DirectIdx, BufId);
if (BufTy == CONSTANT_BUFFER)
return true;
}
return BaseT::pointsToConstantMemory(Loc, AAQI, OrLocal);
}
};
class AddressSpaceAAWrapperPass : public ImmutablePass {
std::unique_ptr<AddressSpaceAAResult> Result;
public:
static char ID;
AddressSpaceAAWrapperPass();
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
AU.addRequired<TargetLibraryInfoWrapperPass>();
AU.addRequired<CodeGenContextWrapper>();
}
bool doInitialization(Module &M) override {
if (M.size() > 0) {
#if LLVM_VERSION_MAJOR >= 10
auto &F = *M.begin(); // see llvmWrapper/Analysis/TargetLibraryInfo.h
#endif
Result.reset(new AddressSpaceAAResult(getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(),
*getAnalysis<CodeGenContextWrapper>().getCodeGenContext()));
}
return false;
}
bool doFinalization(Module &M) override {
Result.reset();
return false;
}
AddressSpaceAAResult &getResult() { return *Result; }
const AddressSpaceAAResult &getResult() const { return *Result; }
};
} // End anonymous namespace
#define PASS_FLAG "igc-address-space-alias-analysis"
#define PASS_DESC "Address space alias analysis"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS true
IGC_INITIALIZE_PASS_BEGIN(AddressSpaceAAWrapperPass, PASS_FLAG, PASS_DESC, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
IGC_INITIALIZE_PASS_END(AddressSpaceAAWrapperPass, PASS_FLAG, PASS_DESC, PASS_CFG_ONLY, PASS_ANALYSIS)
char AddressSpaceAAWrapperPass::ID = 0;
AddressSpaceAAWrapperPass::AddressSpaceAAWrapperPass() : ImmutablePass(ID) {
initializeAddressSpaceAAWrapperPassPass(*PassRegistry::getPassRegistry());
}
ImmutablePass *IGC::createAddressSpaceAAWrapperPass() { return new AddressSpaceAAWrapperPass(); }
void IGC::addJointAddressSpaceAAResults(Pass &P, Function &F, AAResults &AAR) {
if (auto *WrapperPass = P.getAnalysisIfAvailable<AddressSpaceAAWrapperPass>())
AAR.addAAResult(WrapperPass->getResult());
addRayTracingAddressSpaceAAResult(P, F, AAR);
}
// Wrapper around LLVM's ExternalAAWrapperPass so that the default constructor
// gets the callback.
class IGCExternalAAWrapper : public ExternalAAWrapperPass {
public:
static char ID;
IGCExternalAAWrapper() : ExternalAAWrapperPass(&addJointAddressSpaceAAResults) {}
};
ImmutablePass *IGC::createIGCExternalAAWrapper() { return new IGCExternalAAWrapper(); }
char IGCExternalAAWrapper::ID = 0;
IGC_INITIALIZE_PASS_BEGIN(IGCExternalAAWrapper, "igc-aa-wrapper", "IGC Address space alias analysis Wrapper",
PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_END(IGCExternalAAWrapper, "igc-aa-wrapper", "IGC Address space alias analysis Wrapper",
PASS_CFG_ONLY, PASS_ANALYSIS)
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