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// slang-ir-spirv-legalize.cpp
#include "slang-ir-spirv-legalize.h"
#include "slang-ir-glsl-legalize.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
#include "slang-emit-base.h"
#include "slang-glsl-extension-tracker.h"
namespace Slang
{
//
// Legalization of IR for direct SPIRV emit.
//
struct SPIRVLegalizationContext : public SourceEmitterBase
{
SPIRVEmitSharedContext* m_sharedContext;
IRModule* m_module;
// We will use a single work list of instructions that need
// to be considered for specialization or simplification,
// whether generic, existential, etc.
//
OrderedHashSet<IRInst*> workList;
void addToWorkList(IRInst* inst)
{
if (workList.Add(inst))
{
addUsersToWorkList(inst);
}
}
void addUsersToWorkList(IRInst* inst)
{
for (auto use = inst->firstUse; use; use = use->nextUse)
{
auto user = use->getUser();
addToWorkList(user);
}
}
SPIRVLegalizationContext(SPIRVEmitSharedContext* sharedContext, IRModule* module)
: m_sharedContext(sharedContext), m_module(module)
{
}
void processGlobalParam(IRGlobalParam* inst)
{
// If the global param is not a pointer type, make it so and insert explicit load insts.
auto ptrType = as<IRPtrTypeBase>(inst->getDataType());
if (!ptrType)
{
SpvStorageClass storageClass = SpvStorageClassPrivate;
// Figure out storage class based on var layout.
if (auto layout = getVarLayout(inst))
{
if (auto systemValueAttr = layout->findAttr<IRSystemValueSemanticAttr>())
{
String semanticName = systemValueAttr->getName();
semanticName = semanticName.toLower();
if (semanticName == "sv_dispatchthreadid")
{
storageClass = SpvStorageClassInput;
}
}
}
// Make a pointer type of storageClass.
IRBuilder builder(m_sharedContext->m_sharedIRBuilder);
builder.setInsertBefore(inst);
ptrType = builder.getPtrType(kIROp_PtrType, inst->getFullType(), storageClass);
inst->setFullType(ptrType);
// Insert an explicit load at each use site.
List<IRUse*> uses;
for (auto use = inst->firstUse; use; use = use->nextUse)
{
uses.add(use);
}
for (auto use : uses)
{
builder.setInsertBefore(use->getUser());
auto loadedValue = builder.emitLoad(inst);
use->set(loadedValue);
}
}
processGlobalVar(inst);
}
void processGlobalVar(IRInst* inst)
{
auto oldPtrType = as<IRPtrTypeBase>(inst->getDataType());
if (!oldPtrType)
return;
// If the pointer type is already qualified with address spaces (such as
// lowered pointer type from a `HLSLStructuredBufferType`), make no
// further modifications.
if (oldPtrType->hasAddressSpace())
{
addUsersToWorkList(inst);
return;
}
auto varLayout = getVarLayout(inst);
if (!varLayout)
return;
SpvStorageClass storageClass = SpvStorageClassPrivate;
for (auto rr : varLayout->getOffsetAttrs())
{
switch (rr->getResourceKind())
{
case LayoutResourceKind::Uniform:
case LayoutResourceKind::ShaderResource:
case LayoutResourceKind::DescriptorTableSlot:
storageClass = SpvStorageClassUniform;
break;
case LayoutResourceKind::VaryingInput:
storageClass = SpvStorageClassInput;
break;
case LayoutResourceKind::VaryingOutput:
storageClass = SpvStorageClassOutput;
break;
case LayoutResourceKind::UnorderedAccess:
storageClass = SpvStorageClassStorageBuffer;
break;
case LayoutResourceKind::PushConstantBuffer:
storageClass = SpvStorageClassPushConstant;
break;
default:
break;
}
}
auto rate = inst->getRate();
if (as<IRGroupSharedRate>(rate))
{
storageClass = SpvStorageClassWorkgroup;
}
IRBuilder builder(m_sharedContext->m_sharedIRBuilder);
builder.setInsertBefore(inst);
auto newPtrType =
builder.getPtrType(oldPtrType->getOp(), oldPtrType->getValueType(), storageClass);
inst->setFullType(newPtrType);
addUsersToWorkList(inst);
return;
}
void processCall(IRCall* inst)
{
auto funcValue = inst->getOperand(0);
if (auto targetIntrinsic = Slang::findBestTargetIntrinsicDecoration(
funcValue, m_sharedContext->m_targetRequest->getTargetCaps()))
{
SpvSnippet* snippet = m_sharedContext->getParsedSpvSnippet(targetIntrinsic);
if (!snippet)
return;
if (snippet->resultStorageClass != SpvStorageClassMax)
{
auto ptrType = as<IRPtrTypeBase>(inst->getDataType());
if (!ptrType)
return;
IRBuilder builder(m_sharedContext->m_sharedIRBuilder);
builder.setInsertBefore(inst);
auto qualPtrType = builder.getPtrType(
ptrType->getOp(), ptrType->getValueType(), snippet->resultStorageClass);
List<IRInst*> args;
for (UInt i = 0; i < inst->getArgCount(); i++)
args.add(inst->getArg(i));
auto newCall = builder.emitCallInst(qualPtrType, funcValue, args);
inst->replaceUsesWith(newCall);
inst->removeAndDeallocate();
addUsersToWorkList(newCall);
}
}
}
void processGetElementPtr(IRGetElementPtr* inst)
{
if (auto ptrType = as<IRPtrTypeBase>(inst->getBase()->getDataType()))
{
if (!ptrType->hasAddressSpace())
return;
auto oldResultType = as<IRPtrTypeBase>(inst->getDataType());
if (oldResultType->getAddressSpace() != ptrType->getAddressSpace())
{
IRBuilder builder(m_sharedContext->m_sharedIRBuilder);
builder.setInsertBefore(inst);
auto newPtrType = builder.getPtrType(
oldResultType->getOp(),
oldResultType->getValueType(),
ptrType->getAddressSpace());
auto newInst =
builder.emitElementAddress(newPtrType, inst->getBase(), inst->getIndex());
inst->replaceUsesWith(newInst);
inst->removeAndDeallocate();
addUsersToWorkList(newInst);
}
}
}
void processFieldAddress(IRFieldAddress* inst)
{
if (auto ptrType = as<IRPtrTypeBase>(inst->getBase()->getDataType()))
{
if (!ptrType->hasAddressSpace())
return;
auto oldResultType = as<IRPtrTypeBase>(inst->getDataType());
if (oldResultType->getAddressSpace() != ptrType->getAddressSpace())
{
IRBuilder builder(m_sharedContext->m_sharedIRBuilder);
builder.setInsertBefore(inst);
auto newPtrType = builder.getPtrType(
oldResultType->getOp(),
oldResultType->getValueType(),
ptrType->getAddressSpace());
auto newInst =
builder.emitFieldAddress(newPtrType, inst->getBase(), inst->getField());
inst->replaceUsesWith(newInst);
inst->removeAndDeallocate();
addUsersToWorkList(newInst);
}
}
}
void processStructuredBufferType(IRHLSLStructuredBufferTypeBase* inst)
{
IRBuilder builder(m_sharedContext->m_sharedIRBuilder);
builder.setInsertBefore(inst);
auto arrayType = builder.getUnsizedArrayType(inst->getElementType());
auto structType = builder.createStructType();
auto arrayKey = builder.createStructKey();
builder.createStructField(structType, arrayKey, arrayType);
auto ptrType = builder.getPtrType(kIROp_PtrType, structType, SpvStorageClassStorageBuffer);
StringBuilder nameSb;
switch (inst->getOp())
{
case kIROp_HLSLRWStructuredBufferType:
nameSb << "RWStructuredBuffer";
break;
case kIROp_HLSLAppendStructuredBufferType:
nameSb << "AppendStructuredBuffer";
break;
case kIROp_HLSLConsumeStructuredBufferType:
nameSb << "ConsumeStructuredBuffer";
break;
default:
nameSb << "StructuredBuffer";
break;
}
builder.addNameHintDecoration(structType, nameSb.getUnownedSlice());
builder.addDecoration(structType, kIROp_SPIRVBufferBlockDecoration);
inst->replaceUsesWith(ptrType);
inst->removeAndDeallocate();
addUsersToWorkList(ptrType);
}
void processModule()
{
addToWorkList(m_module->getModuleInst());
while (workList.Count() != 0)
{
IRInst* inst = workList.getLast();
workList.removeLast();
switch (inst->getOp())
{
case kIROp_GlobalParam:
processGlobalParam(as<IRGlobalParam>(inst));
break;
case kIROp_GlobalVar:
processGlobalVar(as<IRGlobalVar>(inst));
break;
case kIROp_Call:
processCall(as<IRCall>(inst));
break;
case kIROp_getElementPtr:
processGetElementPtr(as<IRGetElementPtr>(inst));
break;
case kIROp_FieldAddress:
processFieldAddress(as<IRFieldAddress>(inst));
break;
case kIROp_HLSLStructuredBufferType:
case kIROp_HLSLRWStructuredBufferType:
processStructuredBufferType(as<IRHLSLStructuredBufferTypeBase>(inst));
break;
default:
for (auto child = inst->getLastChild(); child; child = child->getPrevInst())
{
addToWorkList(child);
}
break;
}
}
}
};
void legalizeSPIRV(SPIRVEmitSharedContext* sharedContext, IRModule* module)
{
SPIRVLegalizationContext context(sharedContext, module);
context.processModule();
}
void legalizeIRForSPIRV(
SPIRVEmitSharedContext* context,
IRModule* module,
const List<IRFunc*>& entryPoints,
DiagnosticSink* sink)
{
SLANG_UNUSED(sink);
GLSLExtensionTracker extensionTracker;
legalizeEntryPointsForGLSL(module->getSession(), module, entryPoints, sink, &extensionTracker);
legalizeSPIRV(context, module);
}
} // namespace Slang
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