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/*========================== begin_copyright_notice ============================
Copyright (C) 2020-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
///
/// Provides a utility to scan up a few instructions looking for a base address
/// corresponding to a region in raytracing memory. This is to be reused
/// in whatever passes need info on what memory regions they are touching.
///
//===----------------------------------------------------------------------===//
#include "Compiler/CodeGenPublic.h"
#include "MemRegionAnalysis.h"
#include "MDFrameWork.h"
#include "Probe/Assertion.h"
#include "RayTracingRayDispatchGlobalData.h"
#include "llvmWrapper/IR/Value.h"
using namespace llvm;
using namespace IGC;
static bool isGlobalPtr(const InlineDataIntrinsic *I)
{
constexpr uint32_t GlobalPtrOffset =
offsetof(RayDispatchInlinedData, RayDispatchGlobalDataPtr) / sizeof(uint64_t);
return (I->getArg() == GlobalPtrOffset);
}
static Optional<RTMemRegion> getIntrinsicRegion(const GenIntrinsicInst* GII)
{
switch (GII->getIntrinsicID())
{
case GenISAIntrinsic::GenISA_SWHotZonePtr:
return RTMemRegion::SWHotZone;
case GenISAIntrinsic::GenISA_GlobalBufferPointer:
return RTMemRegion::RTGlobals;
case GenISAIntrinsic::GenISA_LocalBufferPointer:
return RTMemRegion::LocalArgs;
case GenISAIntrinsic::GenISA_AsyncStackPtr:
return RTMemRegion::RTAsyncStack;
case GenISAIntrinsic::GenISA_SyncStackPtr:
return RTMemRegion::RTSyncStack;
case GenISAIntrinsic::GenISA_SWStackPtr:
case GenISAIntrinsic::GenISA_ContinuationSignpost:
return RTMemRegion::SWStack;
case GenISAIntrinsic::GenISA_InlinedData:
if (isGlobalPtr(cast<InlineDataIntrinsic>(GII)))
return RTMemRegion::RTGlobals;
else
return None;
default:
return None;
}
}
namespace IGC {
Optional<RTMemRegion>
getRTRegionByAddrspace(const Value* V, const ModuleMetaData &MMD)
{
auto* PtrTy = dyn_cast<PointerType>(V->getType());
if (!PtrTy)
return None;
uint32_t Addrspace = PtrTy->getPointerAddressSpace();
auto& rtInfo = MMD.rtInfo;
if (Addrspace == rtInfo.RTAsyncStackAddrspace)
return RTMemRegion::RTAsyncStack;
else if (Addrspace == rtInfo.SWHotZoneAddrspace)
return RTMemRegion::SWHotZone;
else if (Addrspace == rtInfo.SWStackAddrspace)
return RTMemRegion::SWStack;
else if (Addrspace == rtInfo.RTSyncStackAddrspace)
return RTMemRegion::RTSyncStack;
return None;
}
Optional<RTMemRegion> getRegionOffset(const Value* Ptr, const DataLayout *DL, uint64_t* Offset, uint64_t* dereferenceable_value)
{
// Set an initial value for the Offset, overwriting whatever garbage value there may be.
// If there is a getelementptr instruction the value of the *Offset will be updated.
if (Offset) {
*Offset = 0;
}
while (Ptr)
{
if (auto* GEPI = dyn_cast<GetElementPtrInst>(Ptr))
{
Ptr = GEPI->getPointerOperand();
if (Offset)
{
unsigned IdxWidth = DL->getIndexSizeInBits(
Ptr->getType()->getPointerAddressSpace());
APInt BasePtrOffset(IdxWidth, 0);
// If there is a constant offset on the getelementptr instruction like i64 4
// we can evaluate it at compile time
if (GEPI->accumulateConstantOffset(*DL, BasePtrOffset)) {
*Offset += BasePtrOffset.getZExtValue();
}
// If there is a non-constant or variable offset on the getelementptr instruction like i64 %x
// we cannot evaluate it at compile time, only at run time
else {
return None;
}
}
}
else if (auto* BCI = dyn_cast<BitCastInst>(Ptr))
{
Ptr = BCI->getOperand(0);
}
else if (auto *GII = dyn_cast<GenIntrinsicInst>(Ptr))
{
if (dereferenceable_value) {
bool CanBeNull = false;
bool CanBeFreed = false;
*dereferenceable_value = IGCLLVM::getPointerDereferenceableBytes(Ptr, *DL, CanBeNull, CanBeFreed);
// We probably only want to set the *dereferenceable_value if CanBeNull is false
// But CanBeNull should never be true if you're calling this function on any of those intrinsics in getRegionOffset()
IGC_ASSERT(!CanBeNull);
}
return getIntrinsicRegion(GII);
}
else
{
Ptr = nullptr;
}
}
return None;
}
// This is conceptually the same idea as getRegionOffset() but it doesn't
// compute offsets and is intended to be used late in compilation after GEPs
// have been lowered (or at least mostly lowered). It thus looks through
// more constructs that we don't care to look at in earlier stages.
//
// Currently, the only user of this is for late stage LSC cache controls
// determination.
Optional<RTMemRegion> getRTRegion(const Value* V, const ModuleMetaData &MMD)
{
if (auto Region = getRTRegionByAddrspace(V, MMD))
return Region;
while (V)
{
auto* I = dyn_cast<Instruction>(V);
if (!I)
return None;
switch (I->getOpcode())
{
case Instruction::GetElementPtr:
case Instruction::BitCast:
case Instruction::IntToPtr:
case Instruction::PtrToInt:
case Instruction::Add:
case Instruction::Or:
V = I->getOperand(0);
break;
case Instruction::Call:
if (auto* GII = dyn_cast<GenIntrinsicInst>(I))
return getIntrinsicRegion(GII);
return None;
default:
return None;
}
}
return None;
}
} // namespace IGC
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