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#include "slang-ir-composite-reg-to-mem.h"
#include "slang-ir-dce.h"
#include "slang-ir-insts.h"
#include "slang-ir-util.h"
#include "slang-ir.h"
namespace Slang
{
struct RegisterReplacementWorkItem
{
IRInst* ssaValue;
IRInst* addr;
IRInst* initialStore;
};
void replaceRegisterUseWithAddrUse(
List<RegisterReplacementWorkItem>& workList,
IRInst* ssaValue,
IRInst* addr,
IRInst* initialStore)
{
IRBuilder builder(ssaValue);
traverseUses(
ssaValue,
[&](IRUse* use)
{
auto user = use->getUser();
if (user == initialStore)
return;
builder.setInsertBefore(user);
IRInst* newAddr = nullptr;
// If the user is itself a getElement/getField inst,
// we want to follow that chain and recursively replace
// their users.
if (auto getElementUser = as<IRGetElement>(user))
{
if (getElementUser->getOperands() == use)
{
newAddr = builder.emitElementAddress(addr, getElementUser->getIndex());
}
}
else if (auto getFieldUser = as<IRFieldExtract>(user))
{
if (getFieldUser->getOperands() == use)
{
newAddr = builder.emitFieldAddress(
builder.getPtrType(user->getFullType()),
addr,
getFieldUser->getField());
}
}
if (newAddr)
{
workList.add(RegisterReplacementWorkItem{user, newAddr, nullptr});
}
else
{
// For all other uses, we emit a load from addr and use it.
auto val = builder.emitLoad(addr);
builder.replaceOperand(use, val);
}
});
}
void replaceRegisterUseWithAddrUse(IRInst* ssaValue, IRInst* addr, IRInst* initialStore)
{
List<RegisterReplacementWorkItem> workList, pendingWorkList;
workList.add(RegisterReplacementWorkItem{ssaValue, addr, initialStore});
while (workList.getCount())
{
for (auto item : workList)
{
replaceRegisterUseWithAddrUse(
pendingWorkList,
item.ssaValue,
item.addr,
item.initialStore);
}
workList.swapWith(pendingWorkList);
pendingWorkList.clear();
}
}
void convertCompositeTypeParametersToPointers(IRFunc* func)
{
IRBuilder builder(func);
List<UInt> compositeParamIds;
UInt idx = 0;
List<IRParam*> paramWorkList;
if (!func->findDecoration<IREntryPointDecoration>())
{
// Only translate function parameters for non entry points.
for (auto param : func->getParams())
{
if (as<IRArrayTypeBase>(param->getFullType()) || as<IRStructType>(param->getFullType()))
{
paramWorkList.add(param);
compositeParamIds.add(idx);
}
idx++;
}
}
for (auto param : paramWorkList)
{
// We have a composite type parameter, so we need to replace it with a pointer.
//
auto ptrCompositeType = builder.getPtrType(param->getFullType());
auto newParam = builder.createParam(ptrCompositeType);
newParam->insertBefore(param);
replaceRegisterUseWithAddrUse(param, newParam, nullptr);
param->removeAndDeallocate();
}
if (paramWorkList.getCount())
{
// The function is modified, we need to also update its type.
List<IRType*> paramTypes;
for (auto param : func->getParams())
{
paramTypes.add(param->getFullType());
}
auto newFuncType = builder.getFuncType(
(UInt)paramTypes.getCount(),
paramTypes.getBuffer(),
func->getResultType());
func->setFullType(newFuncType);
// Update all the call sites to pass the composite by pointer.
traverseUses(
func,
[&](IRUse* use)
{
if (const auto call = as<IRCall>(use->getUser()))
{
builder.setInsertBefore(call);
for (auto paramId : compositeParamIds)
{
auto arg = call->getArg(paramId);
SLANG_ASSERT(as<IRPtrTypeBase>(paramTypes[paramId]));
auto var =
builder.emitVar(as<IRPtrTypeBase>(paramTypes[paramId])->getValueType());
builder.emitStore(var, arg);
call->setArg(paramId, var);
}
}
});
}
// Now work through all the local values and process uses of `Load(composite)`.
for (auto block : func->getBlocks())
{
for (auto inst : block->getModifiableChildren())
{
if (!as<IRArrayTypeBase>(inst->getDataType()) && !as<IRStructType>(inst->getDataType()))
continue;
if (inst->getParent() != block)
continue;
IRInst* tempVar = nullptr;
IRInst* initialStore = nullptr;
builder.setInsertAfter(inst);
switch (inst->getOp())
{
case kIROp_Load:
{
auto ptr = inst->getOperand(0);
auto rootPtr = getRootAddr(ptr);
if (as<IRConstantBufferType>(rootPtr->getDataType()) ||
as<IRParameterBlockType>(rootPtr->getDataType()))
{
tempVar = ptr;
}
else
{
tempVar = builder.emitVar(inst->getFullType());
initialStore = builder.emitStore(tempVar, inst);
}
break;
}
case kIROp_Call:
{
tempVar = builder.emitVar(inst->getFullType());
initialStore = builder.emitStore(tempVar, inst);
break;
}
default:
break;
}
if (!tempVar)
continue;
replaceRegisterUseWithAddrUse(inst, tempVar, initialStore);
}
}
eliminateDeadCode(func);
}
void convertCompositeTypeParametersToPointers(IRModule* module)
{
for (auto inst : module->getGlobalInsts())
{
if (auto func = as<IRFunc>(inst))
{
convertCompositeTypeParametersToPointers(func);
}
}
}
} // namespace Slang
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