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#include "slang-ir-specialize-address-space.h"
#include "slang-ir.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
#include "slang-ir-clone.h"
namespace Slang
{
struct AddressSpaceContext : public AddressSpaceSpecializationContext
{
IRModule* module;
Dictionary<IRInst*, AddressSpace> mapInstToAddrSpace;
InitialAddressSpaceAssigner* addrSpaceAssigner;
AddressSpaceContext(IRModule* inModule, InitialAddressSpaceAssigner* inAddrSpaceAssigner)
: module(inModule)
, addrSpaceAssigner(inAddrSpaceAssigner)
{
}
AddressSpace getAddressSpaceFromVarType(IRInst* type)
{
return addrSpaceAssigner->getAddressSpaceFromVarType(type);
}
AddressSpace getLeafInstAddressSpace(IRInst* inst)
{
return addrSpaceAssigner->getLeafInstAddressSpace(inst);
}
AddressSpace getAddrSpace(IRInst* inst) override
{
auto addrSpace = mapInstToAddrSpace.tryGetValue(inst);
if (addrSpace)
return *addrSpace;
return AddressSpace::Generic;
}
List<IRFunc*> workList;
struct FuncSpecializationKey
{
private:
IRFunc* func;
List<AddressSpace> argAddrSpaces;
HashCode hashCode;
public:
IRFunc* getFunc() const { return func; }
ArrayView<AddressSpace> getArgAddrSpaces() const { return argAddrSpaces.getArrayView(); }
FuncSpecializationKey() = default;
FuncSpecializationKey(IRFunc* func, List<AddressSpace> argAddrSpaces)
: func(func)
, argAddrSpaces(argAddrSpaces)
{
Hasher hasher;
hasher.addHash(Slang::getHashCode(func));
for (auto addrSpace : argAddrSpaces)
{
hasher.addHash((HashCode)addrSpace);
}
hashCode = hasher.getResult();
}
bool operator==(const FuncSpecializationKey& key) const
{
if (func != key.func)
return false;
if (argAddrSpaces.getCount() != key.argAddrSpaces.getCount())
return false;
for (Index i = 0; i < argAddrSpaces.getCount(); i++)
{
if (argAddrSpaces[i] != key.argAddrSpaces[i])
return false;
}
return true;
}
HashCode getHashCode() const
{
return hashCode;
}
};
Dictionary<FuncSpecializationKey, IRFunc*> functionSpecializations;
IRFunc* specializeFunc(const FuncSpecializationKey& key)
{
auto func = key.getFunc();
IRCloneEnv cloneEnv;
IRBuilder builder(module);
// First, clone the function body.
builder.setInsertBefore(func);
auto specializedFunc = as<IRFunc>(cloneInst(&cloneEnv, &builder, func));
// Update the parameter types with new address spaces in the specialized function.
Index paramIndex = 0;
for (auto param : specializedFunc->getParams())
{
auto paramType = param->getFullType();
auto ptrType = as<IRPtrTypeBase>(paramType);
if (ptrType)
{
auto paramAddrSpace = key.getArgAddrSpaces()[paramIndex];
auto newParamType = builder.getPtrType(ptrType->getOp(), ptrType->getValueType(), paramAddrSpace);
param->setFullType(newParamType);
mapInstToAddrSpace[param] = paramAddrSpace;
}
paramIndex++;
}
// Update the function type.
fixUpFuncType(specializedFunc);
functionSpecializations[key] = specializedFunc;
return specializedFunc;
}
AddressSpace getFuncResultAddrSpace(IRFunc* callee)
{
auto funcType = as<IRFuncType>(callee->getDataType());
return getAddressSpaceFromVarType(funcType->getResultType());
}
// Return true if the address space of the function return type is changed.
bool processFunction(IRFunc* func)
{
bool retValAddrSpaceChanged = false;
Dictionary<IRInst*, AddressSpace> mapVarValueToAddrSpace;
bool changed = true;
while (changed)
{
changed = false;
for (auto block : func->getBlocks())
{
bool isFirstBlock = block == func->getFirstBlock();
for (auto inst : block->getChildren())
{
// If we have already assigned an address space to this instruction, then skip it.
if (mapInstToAddrSpace.containsKey(inst))
{
// TODO: if the inst is a phi node, we need to check if the address space of the phi arguments
// is consistent. If not, then we need to report an error.
// For now, we just skip the checks.
continue;
}
// If the inst already has a pointer type with explicit address space, then use it.
if (auto ptrType = as<IRPtrTypeBase>(inst->getDataType()))
{
if (ptrType->hasAddressSpace())
{
mapInstToAddrSpace[inst] = (AddressSpace)ptrType->getAddressSpace();
continue;
}
}
// Otherwise, try to assign an address space based on the instruction type.
switch (inst->getOp())
{
case kIROp_Var:
case kIROp_RWStructuredBufferGetElementPtr:
{
// The address space of these insts should be assigned by the initial address space assigner.
AddressSpace addrSpace = AddressSpace::Generic;
if (addrSpaceAssigner->tryAssignAddressSpace(inst, addrSpace))
{
mapInstToAddrSpace[inst] = addrSpace;
changed = true;
}
break;
}
case kIROp_GetElementPtr:
case kIROp_FieldAddress:
if (!mapInstToAddrSpace.containsKey(inst))
{
auto addrSpace = getAddrSpace(inst->getOperand(0));
if (addrSpace != AddressSpace::Generic)
{
mapInstToAddrSpace[inst] = addrSpace;
changed = true;
}
}
break;
case kIROp_Store:
{
auto addrSpace = getAddrSpace(inst->getOperand(1));
if (addrSpace != AddressSpace::Generic)
{
mapVarValueToAddrSpace[inst->getOperand(0)] = addrSpace;
mapInstToAddrSpace[inst] = addrSpace;
changed = true;
}
}
break;
case kIROp_Load:
{
if (auto addrSpace = mapVarValueToAddrSpace.tryGetValue(inst->getOperand(0)))
{
mapInstToAddrSpace[inst] = *addrSpace;
changed = true;
}
}
break;
case kIROp_Param:
if (!isFirstBlock)
{
auto phiArgs = getPhiArgs(inst);
AddressSpace addrSpace = AddressSpace::Generic;
for (auto arg : phiArgs)
{
auto argAddrSpace = getAddrSpace(arg);
if (argAddrSpace != AddressSpace::Generic)
{
if (addrSpace != AddressSpace::Generic && addrSpace != argAddrSpace)
{
// TODO: this is an error in user code, because the address spaces of the
// phi arguments don't match.
}
addrSpace = argAddrSpace;
}
}
if (addrSpace != AddressSpace::Generic)
{
mapInstToAddrSpace[inst] = addrSpace;
changed = true;
}
break;
}
break;
case kIROp_Call:
{
auto callInst = as<IRCall>(inst);
auto callee = as<IRFunc>(inst->getOperand(0));
if (callee)
{
List<AddressSpace> argAddrSpaces;
bool fullySpecialized = true;
for (UInt i = 0; i < callInst->getArgCount(); i++)
{
auto arg = callInst->getArg(i);
auto argAddrSpace = getAddrSpace(arg);
argAddrSpaces.add(getAddrSpace(arg));
if (argAddrSpace == AddressSpace::Generic &&
as<IRPtrTypeBase>(arg->getDataType()))
{
fullySpecialized = false;
break;
}
}
if (!fullySpecialized)
break;
FuncSpecializationKey key(callee, argAddrSpaces);
IRFunc* specializedCallee = nullptr;
if (IRFunc** specializedFunc = functionSpecializations.tryGetValue(key))
{
specializedCallee = *specializedFunc;
}
else
{
specializedCallee = specializeFunc(key);
workList.add(specializedCallee);
}
IRBuilder builder(callInst);
builder.setInsertBefore(callInst);
if (specializedCallee != callInst->getCallee())
{
callInst = as<IRCall>(builder.replaceOperand(callInst->getOperands(), specializedCallee));
}
auto callResultAddrSpace = getFuncResultAddrSpace(specializedCallee);
if (callResultAddrSpace != AddressSpace::Generic)
{
mapInstToAddrSpace[callInst] = callResultAddrSpace;
changed = true;
}
}
}
break;
case kIROp_Return:
{
auto retVal = inst->getOperand(0);
auto addrSpace = getAddrSpace(retVal);
if (addrSpace != AddressSpace::Generic)
{
auto funcType = as<IRFuncType>(func->getDataType());
AddressSpace resultAddrSpace = getFuncResultAddrSpace(func);
if (resultAddrSpace != addrSpace)
{
auto ptrResultType = as<IRPtrTypeBase>(funcType->getResultType());
SLANG_ASSERT(ptrResultType);
IRBuilder builder(func);
auto newResultType = builder.getPtrType(ptrResultType->getOp(), ptrResultType->getValueType(), addrSpace);
fixUpFuncType(func, newResultType);
retValAddrSpaceChanged = true;
}
}
}
break;
}
}
}
}
return retValAddrSpaceChanged;
}
static void setDataType(IRInst* inst, IRType* dataType)
{
auto rate = inst->getRate();
if (!rate)
{
inst->setFullType(dataType);
return;
}
IRBuilder builder(inst);
builder.setInsertBefore(inst);
auto newType = builder.getRateQualifiedType(rate, dataType);
inst->setFullType(newType);
}
void applyAddressSpaceToInstType()
{
for (auto [inst, addrSpace] : mapInstToAddrSpace)
{
auto ptrType = as<IRPtrTypeBase>(inst->getDataType());
if (ptrType)
{
IRBuilder builder(inst);
auto newType = builder.getPtrType(ptrType->getOp(), ptrType->getValueType(), addrSpace);
setDataType(inst, newType);
}
}
}
void processModule()
{
for (auto globalInst : module->getGlobalInsts())
{
auto addrSpace = getLeafInstAddressSpace(globalInst);
if (addrSpace != AddressSpace::Generic)
{
mapInstToAddrSpace[globalInst] = addrSpace;
}
if (auto func = as<IRFunc>(globalInst))
{
if (func->findDecoration<IREntryPointDecoration>())
workList.add(func);
}
}
HashSet<IRFunc*> newWorkList;
while (workList.getCount())
{
for (Index i = 0; i < workList.getCount(); i++)
{
auto func = workList[i];
bool resultTypeChanged = processFunction(func);
if (resultTypeChanged)
{
for (auto use = func->firstUse; use; use = use->nextUse)
{
if (auto callInst = as<IRCall>(use->getUser()))
{
newWorkList.add(getParentFunc(callInst));
}
}
}
}
workList.clear();
for (auto f : newWorkList)
workList.add(f);
}
applyAddressSpaceToInstType();
}
};
void specializeAddressSpace(IRModule* module, InitialAddressSpaceAssigner* addrSpaceAssigner)
{
AddressSpaceContext context(module, addrSpaceAssigner);
context.processModule();
}
}
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