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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/CISACodeGen/PositionDepAnalysis.hpp"
#include "GenISAIntrinsics/GenIntrinsicInst.h"
#include "Compiler/CodeGenPublic.h"
#include "Compiler/IGCPassSupport.h"
using namespace IGC;
using namespace llvm;
char PositionDepAnalysis::ID = 0;
#define PASS_FLAG "PositionDepAnalysis"
#define PASS_DESCRIPTION "Pos"
#define PASS_CFG_ONLY true
#define PASS_ANALYSIS true
IGC_INITIALIZE_PASS_BEGIN(PositionDepAnalysis, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(WIAnalysis)
IGC_INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
IGC_INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_END(PositionDepAnalysis, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
namespace IGC
{
PositionDepAnalysis::PositionDepAnalysis() : FunctionPass(ID)
{
initializePositionDepAnalysisPass(*PassRegistry::getPassRegistry());
}
bool PositionDepAnalysis::runOnFunction(llvm::Function& F)
{
CodeGenContext* ctx = getAnalysis<CodeGenContextWrapper>().getCodeGenContext();
if (ctx->type == ShaderType::VERTEX_SHADER && ctx->m_DriverInfo.PreventZFighting())
{
visit(F);
}
return false;
}
void PositionDepAnalysis::visitCallInst(CallInst& I)
{
if (GenIntrinsicInst * intr = dyn_cast<GenIntrinsicInst>(&I))
{
if (intr->getIntrinsicID() == GenISAIntrinsic::GenISA_URBWrite)
{
if (ConstantInt * index = dyn_cast<ConstantInt>(intr->getOperand(0)))
{
// position is written at offset 0 or 1
if (index->isZero() || index->isOne())
{
unsigned int baseSourceIndex = index->isZero() ? 6 : 2;
for (unsigned int i = 0; i < 4; i++)
{
if (Instruction * instDep = dyn_cast<Instruction>(intr->getOperand(baseSourceIndex + i)))
{
UpdateDependency(instDep);
}
}
}
}
}
}
}
void PositionDepAnalysis::UpdateDependency(Instruction* inst)
{
auto it = m_PositionDep.insert(inst);
if (it.second)
{
for (unsigned int i = 0; i < inst->getNumOperands(); ++i)
{
if (Instruction * srcInst = dyn_cast<Instruction>(inst->getOperand(i)))
{
UpdateDependency(srcInst);
}
}
}
}
bool PositionDepAnalysis::PositionDependsOnInst(Instruction* inst)
{
return m_PositionDep.find(inst) != m_PositionDep.end();
}
}
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