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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 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"
using namespace llvm;
using namespace IGC;
namespace {
class AddressSpaceAAResult : public AAResultBase<AddressSpaceAAResult> {
friend AAResultBase<AddressSpaceAAResult>;
const TargetLibraryInfo& TLI;
const CodeGenContext& CGC;
public:
explicit AddressSpaceAAResult(
const TargetLibraryInfo& TLI,
const CodeGenContext& ctx)
: AAResultBase(), TLI(TLI), CGC(ctx) {}
AddressSpaceAAResult(AddressSpaceAAResult&& Arg)
: AAResultBase(std::move(Arg)), TLI(Arg.TLI), CGC(Arg.CGC) {}
IGCLLVM::AliasResultEnum alias(const MemoryLocation& LocA, const MemoryLocation& LocB
#if LLVM_VERSION_MAJOR >= 9
, AAQueryInfo & AAQI
#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)
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)->bool
{
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 AAResultBase::alias(LocA, LocB
#if LLVM_VERSION_MAJOR >= 9
, AAQI
#endif
);
}
bool pointsToConstantMemory(const llvm::MemoryLocation& Loc,
#if LLVM_VERSION_MAJOR >= 9
AAQueryInfo & AAQI,
#endif
bool OrLocal) {
// Pointers to constant address space memory, well, point to constant memory
PointerType* ptrType = dyn_cast<PointerType>(Loc.Ptr->getType());
if (ptrType && 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 AAResultBase::pointsToConstantMemory(Loc,
#if LLVM_VERSION_MAJOR >= 9
AAQI,
#endif
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)
{
Result.reset(new AddressSpaceAAResult(
getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(
#if LLVM_VERSION_MAJOR >= 10
*M.begin()
#endif
),
*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::addAddressSpaceAAResult(Pass& P, Function&, AAResults& AAR) {
if (auto * WrapperPass = P.getAnalysisIfAvailable<AddressSpaceAAWrapperPass>())
AAR.addAAResult(WrapperPass->getResult());
if (auto * WrapperPass = P.getAnalysisIfAvailable<RayTracingAddressSpaceAAWrapperPass>())
AAR.addAAResult(WrapperPass->getResult());
}
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