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/*========================== begin_copyright_notice ============================
Copyright (C) 2019-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
///
/// This is a simple pass intended to do any final transformations before going
/// to the OptimizeIR stage.
///
//===----------------------------------------------------------------------===//
#include "IGC/common/StringMacros.hpp"
#include "RTBuilder.h"
#include "Compiler/IGCPassSupport.h"
#include "iStdLib/utility.h"
#include "common/LLVMUtils.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/Transforms/Utils/Local.h>
#include <llvm/IR/InstIterator.h>
#include <llvm/IR/Dominators.h>
#include <llvmWrapper/Support/Alignment.h>
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
class RayTracingFinalizePass : public ModulePass
{
public:
RayTracingFinalizePass() : ModulePass(ID)
{
initializeRayTracingFinalizePassPass(*PassRegistry::getPassRegistry());
}
bool runOnModule(Module &M) override;
StringRef getPassName() const override
{
return "RayTracingFinalizePass";
}
void getAnalysisUsage(llvm::AnalysisUsage &AU) const override
{
AU.setPreservesCFG();
AU.addRequired<CodeGenContextWrapper>();
AU.addRequired<DominatorTreeWrapperPass>();
}
static char ID;
};
char RayTracingFinalizePass::ID = 0;
// Register pass to igc-opt
#define PASS_FLAG "raytracing-finalize"
#define PASS_DESCRIPTION "Final transformations prior to optimization"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(RayTracingFinalizePass, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(RayTracingFinalizePass, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
static void removeDups(Value *&V, Instruction* I, BasicBlock& EntryBB)
{
if (V)
{
I->replaceAllUsesWith(V);
I->eraseFromParent();
}
else
{
I->moveBefore(&*EntryBB.getFirstInsertionPt());
V = I;
}
}
bool RayTracingFinalizePass::runOnModule(Module &M)
{
auto *Ctx = static_cast<RayDispatchShaderContext*>(
getAnalysis<CodeGenContextWrapper>().getCodeGenContext());
for (auto& F : M)
{
if (F.isDeclaration())
continue;
Ctx->setShaderHash(&F);
auto& EntryBB = F.getEntryBlock();
auto& DL = M.getDataLayout();
auto& DT = getAnalysis<DominatorTreeWrapperPass>(F).getDomTree();
BasicBlock* AsyncBB = nullptr;
SmallVector<Instruction*, 8> Asyncs;
BasicBlock* HotZoneBB = nullptr;
SmallVector<Instruction*, 8> HotZones;
Value* AsyncStackID = nullptr;
Value* GlobalBufferPointer = nullptr;
Value* LocalBufferPointer = nullptr;
for (auto II = inst_begin(&F), IE = inst_end(&F); II != IE; /* empty */)
{
Instruction& I = *II++;
if (auto * LI = dyn_cast<LoadInst>(&I))
{
// Temporary WA to ensure we don't page fault on unaligned
// acceses.
uint32_t Align = (uint32_t)LI->getAlignment();
if (Align == 0)
Align = (uint32_t)DL.getTypeAllocSize(LI->getType());
if (Align >= 8)
LI->setAlignment(IGCLLVM::getCorrectAlign(4));
}
else if (auto * SI = dyn_cast<StoreInst>(&I))
{
// Temporary WA to ensure we don't page fault on unaligned
// acceses.
uint32_t Align = (uint32_t)SI->getAlignment();
if (Align == 0)
Align = (uint32_t)DL.getTypeAllocSize(
SI->getValueOperand()->getType());
if (Align >= 8)
SI->setAlignment(IGCLLVM::getCorrectAlign(4));
}
else if (auto * GII = dyn_cast<GenIntrinsicInst>(&I))
{
// These will be part of the payload. Move them to the entry
// to guarantee they are CSE'd to a single call each.
switch (GII->getIntrinsicID())
{
case GenISAIntrinsic::GenISA_ContinuationSignpost:
{
auto* Signpost = cast<ContinuationSignpostIntrinsic>(GII);
Signpost->replaceAllUsesWith(Signpost->getFrameAddr());
Signpost->eraseFromParent();
break;
}
case GenISAIntrinsic::GenISA_PayloadPtr:
{
auto* Payload = cast<PayloadPtrIntrinsic>(GII);
Payload->replaceAllUsesWith(Payload->getPayloadPtr());
Payload->eraseFromParent();
break;
}
case GenISAIntrinsic::GenISA_AsyncStackID:
removeDups(AsyncStackID, GII, EntryBB);
break;
case GenISAIntrinsic::GenISA_GlobalBufferPointer:
removeDups(GlobalBufferPointer, GII, EntryBB);
break;
case GenISAIntrinsic::GenISA_LocalBufferPointer:
removeDups(LocalBufferPointer, GII, EntryBB);
break;
case GenISAIntrinsic::GenISA_AsyncStackPtr:
Asyncs.push_back(GII);
if (!AsyncBB)
{
AsyncBB = GII->getParent();
}
else
{
AsyncBB = DT.findNearestCommonDominator(
AsyncBB, GII->getParent());
}
break;
case GenISAIntrinsic::GenISA_SWHotZonePtr:
HotZones.push_back(GII);
if (!HotZoneBB)
{
HotZoneBB = GII->getParent();
}
else
{
HotZoneBB = DT.findNearestCommonDominator(
HotZoneBB, GII->getParent());
}
break;
default:
break;
}
}
}
if (AsyncBB)
{
RTBuilder RTB(&*AsyncBB->getFirstInsertionPt(), *Ctx);
Value* AsyncStackPtr =
RTB.getAsyncStackPointer(true);
for (auto* I : Asyncs)
{
I->replaceAllUsesWith(AsyncStackPtr);
I->eraseFromParent();
}
}
if (HotZoneBB)
{
RTBuilder RTB(&*HotZoneBB->getFirstInsertionPt(), *Ctx);
Value* SWHotZonePtr = RTB.getSWHotZonePointer(true);
for (auto* I : HotZones)
{
I->replaceAllUsesWith(SWHotZonePtr);
I->eraseFromParent();
}
}
}
return true;
}
namespace IGC
{
Pass* createRayTracingFinalizePass(void)
{
return new RayTracingFinalizePass();
}
} // namespace IGC
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