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/*========================== begin_copyright_notice ============================
Copyright (C) 2020-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
//
// Simple utility functions to track the usage of allocas and rewrite their
// types. This is useful for promoting global memory allocas to either
// stateful or scratch space.
//
//===----------------------------------------------------------------------===//
#include "AllocaTracking.h"
#include "RTBuilder.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/Instruction.h>
#include <llvm/IR/IntrinsicInst.h>
#include <llvmWrapper/IR/Instructions.h>
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
namespace AllocaTracking {
// recursively trace all the users of 'I' and check whether they would be safe
// to transform. Build up the list in 'Insts'.
bool processAlloca(
Instruction* I,
bool AllowCapture,
SmallVector<Instruction*, 4> &Insts,
DenseSet<CallInst*> &DeferredInsts)
{
Insts.push_back(I);
for (auto* U : I->users())
{
auto* UI = cast<Instruction>(U);
switch (UI->getOpcode())
{
case Instruction::GetElementPtr:
case Instruction::BitCast:
if (!processAlloca(UI, AllowCapture, Insts, DeferredInsts))
return false;
break;
case Instruction::Load:
break;
case Instruction::Store:
if (I == cast<StoreInst>(UI)->getValueOperand() && !AllowCapture)
return false;
break;
case Instruction::Call:
if (auto* GII = dyn_cast<GenIntrinsicInst>(UI);
GII && AllowCapture)
{
bool Legal = false;
switch (GII->getIntrinsicID())
{
case GenISAIntrinsic::GenISA_TraceRayAsyncHL:
case GenISAIntrinsic::GenISA_CallShaderHL:
Legal = true;
break;
default:
return false;
}
if (Legal)
{
DeferredInsts.insert(GII);
break;
}
}
else if (auto *II = dyn_cast<IntrinsicInst>(UI))
{
bool Legal = false;
switch (II->getIntrinsicID())
{
case Intrinsic::memcpy:
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end:
Legal = true;
break;
default:
return false;
}
if (Legal)
{
DeferredInsts.insert(II);
break;
}
}
return false;
default:
return false;
}
}
return true;
}
// Given a safe list, transform each of their types.
void rewriteTypes(
uint32_t NewAddrSpace,
SmallVector<Instruction*, 4> &Insts,
DenseSet<CallInst*> &DeferredInsts)
{
for (auto* I : Insts)
{
switch (I->getOpcode())
{
case Instruction::GetElementPtr:
case Instruction::BitCast:
case Instruction::Alloca:
{
auto* EltTy = I->getType()->getPointerElementType();
auto* NewTy = PointerType::get(EltTy, NewAddrSpace);
I->mutateType(NewTy);
break;
}
default:
break;
}
}
for (auto* II : DeferredInsts)
{
auto* FTy = II->getFunctionType();
IGC_ASSERT_MESSAGE(FTy->getReturnType()->isVoidTy(),
"Only handles void right now!");
SmallVector<Type*, 4> Tys;
for (auto &Op : IGCLLVM::args(II))
Tys.push_back(Op->getType());
auto* NewFTy = FunctionType::get(
FTy->getReturnType(), Tys, FTy->isVarArg());
Function* CurFunc = II->getCalledFunction();
Function* NewFunc = nullptr;
if (isa<GenIntrinsicInst>(II))
{
NewFunc = Function::Create(
NewFTy,
CurFunc->getLinkage(),
CurFunc->getName(),
CurFunc->getParent());
}
else if (isa<IntrinsicInst>(II))
{
NewFunc = RTBuilder::updateIntrinsicMangle(
NewFTy, *CurFunc);
}
else
{
IGC_ASSERT_MESSAGE(0, "not yet handled!");
}
II->setCalledFunction(NewFunc);
}
}
} // namespace AllocaTracking
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