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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
///
/// This pass will convert all load/store instructions with the address spaces
/// associated with raytracing memory regions to ldraw/storeraw with the
/// resource loaded from the RayDispatchGlobalData and the pointer becoming
/// the offset. For example:
///
/// %SWStackOffset = load i32, i32 addrspace(3080194)* %"&SWStackOffset", align 16
///
/// ==>
///
/// %9 = add i32 %baseSSHOffset, 64
/// %10 = ptrtoint i32 addrspace(3080194)* %"&SWStackOffset" to i32
/// %11 = inttoptr i32 %9 to i8 addrspace(3080194)*
/// %SWStackOffset = call i32 @llvm.genx.GenISA.ldraw.indexed.i32.p3080194i8(i8 addrspace(3080194)* %11, i32 %10, i32 16, i1 false)
///
//===----------------------------------------------------------------------===//
#include "RayTracingStatefulPass.h"
#include "Compiler/IGCPassSupport.h"
#include "Compiler/CodeGenPublic.h"
#include "AdaptorCommon/RayTracing/RTBuilder.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/Function.h>
#include <llvm/IR/InstIterator.h>
#include <llvm/IR/Instructions.h>
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
// We run this prior to legalization so we should ensure any loads/stores to
// i1 are upconverted prior to using ldraw*/storeraw* intrinsics.
static LoadInst* legalizeLoad(LoadInst* LI)
{
if (!LI->getType()->isIntegerTy(1))
return LI;
IRBuilder<> IRB(LI);
PointerType* ptrTy = cast<PointerType>(LI->getPointerOperand()->getType());
unsigned addressSpace = ptrTy->getAddressSpace();
PointerType* I8PtrTy = IRB.getInt8PtrTy(addressSpace);
Value* I8PtrOp = IRB.CreateBitCast(LI->getPointerOperand(), I8PtrTy);
LoadInst* pNewLoadInst = IGC::cloneLoad(LI, I8PtrOp);
Value* newVal = IRB.CreateTrunc(pNewLoadInst, LI->getType());
LI->replaceAllUsesWith(newVal);
LI->eraseFromParent();
return pNewLoadInst;
}
static StoreInst* legalizeStore(StoreInst* SI)
{
if (!SI->getValueOperand()->getType()->isIntegerTy(1))
return SI;
IRBuilder<> IRB(SI);
Value* newVal = IRB.CreateZExt(SI->getValueOperand(), IRB.getInt8Ty());
PointerType* ptrTy = cast<PointerType>(SI->getPointerOperand()->getType());
unsigned addressSpace = ptrTy->getAddressSpace();
PointerType* I8PtrTy = IRB.getInt8PtrTy(addressSpace);
Value* I8PtrOp = IRB.CreateBitCast(SI->getPointerOperand(), I8PtrTy);
auto *NewSI = IGC::cloneStore(SI, newVal, I8PtrOp);
SI->eraseFromParent();
return NewSI;
}
Value* getBaseSSHOffset(CodeGenContext* Ctx, RTBuilder& RTB) {
if (Ctx->type == ShaderType::RAYTRACING_SHADER)
{
return RTB.getBaseSSHOffset();
}
else
{
Function* pFunc = GenISAIntrinsic::getDeclaration(
Ctx->getModule(),
GenISAIntrinsic::GenISA_RuntimeValue,
RTB.getInt32Ty());
return RTB.CreateCall(pFunc, RTB.getInt32(Ctx->getModuleMetaData()->pushInfo.rtSyncSurfPtrOffset));
}
}
bool RaytracingStatefulPass::runOnFunction(Function& F)
{
CodeGenContext *Ctx = getAnalysis<CodeGenContextWrapper>().getCodeGenContext();
auto& rtInfo = Ctx->getModuleMetaData()->rtInfo;
RTBuilder RTB(F.getContext(), *Ctx);
bool Changed = false;
for (auto II = inst_begin(&F), IE = inst_end(&F); II != IE; /* empty */)
{
Instruction* I = &*II++;
Value* PointerOp = nullptr;
if (auto* LI = dyn_cast<LoadInst>(I))
PointerOp = LI->getPointerOperand();
else if (auto* SI = dyn_cast<StoreInst>(I))
PointerOp = SI->getPointerOperand();
else
continue;
uint32_t Addrspace = PointerOp->getType()->getPointerAddressSpace();
uint32_t BaseOffset = 0;
if (Addrspace == rtInfo.RTAsyncStackAddrspace)
BaseOffset = *rtInfo.RTAsyncStackSurfaceStateOffset;
else if (Addrspace == rtInfo.SWHotZoneAddrspace)
BaseOffset = *rtInfo.SWHotZoneSurfaceStateOffset;
else if (Addrspace == rtInfo.SWStackAddrspace)
BaseOffset = *rtInfo.SWStackSurfaceStateOffset;
else if (Addrspace == rtInfo.RTSyncStackAddrspace)
BaseOffset = *rtInfo.RTSyncStackSurfaceStateOffset;
else
continue;
if (DecodeBufferType(Addrspace) == SSH_BINDLESS)
BaseOffset <<= Ctx->platform.getBSOLocInExtDescriptor();
RTB.SetInsertPoint(I);
auto* BaseSSHOffset = getBaseSSHOffset(Ctx, RTB);
auto* ResourceOffset =
RTB.CreateAdd(BaseSSHOffset, RTB.getInt32(BaseOffset));
auto* Offset = RTB.CreatePtrToInt(PointerOp, RTB.getInt32Ty());
auto* ResourcePtr = RTB.CreateIntToPtr(
ResourceOffset,
RTB.getInt8PtrTy(Addrspace));
if (auto* LI = dyn_cast<LoadInst>(I))
{
LI = legalizeLoad(LI);
auto* LRI = CreateLoadRawIntrinsic(LI, ResourcePtr, Offset);
LRI->takeName(LI);
LI->replaceAllUsesWith(LRI);
LI->eraseFromParent();
}
else if (auto* SI = dyn_cast<StoreInst>(I))
{
SI = legalizeStore(SI);
CreateStoreRawIntrinsic(SI, ResourcePtr, Offset);
SI->eraseFromParent();
}
Changed = true;
}
return Changed;
}
char RaytracingStatefulPass::ID = 0;
#define PASS_FLAG2 "raytracing-stateful-init"
#define PASS_DESCRIPTION2 "Adds intrinsic for indirect stateful access"
#define PASS_CFG_ONLY2 false
#define PASS_ANALYSIS2 false
IGC_INITIALIZE_PASS_BEGIN(RaytracingStatefulPass, PASS_FLAG2, PASS_DESCRIPTION2, PASS_CFG_ONLY2, PASS_ANALYSIS2)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(RaytracingStatefulPass, PASS_FLAG2, PASS_DESCRIPTION2, PASS_CFG_ONLY2, PASS_ANALYSIS2)
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