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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/IGCPassSupport.h"
#include "common/LLVMWarningsPush.hpp"
#include "llvm/IR/InstIterator.h"
#include "common/LLVMWarningsPop.hpp"
#include "GenISAIntrinsics/GenIntrinsicInst.h"
#include "Compiler/CodeGenPublicEnums.h"
#include "Compiler/CISACodeGen/helper.h"
using namespace IGC;
using namespace llvm;
class RemoveNonPositionOutput : public llvm::FunctionPass {
public:
static char ID;
RemoveNonPositionOutput();
~RemoveNonPositionOutput() {}
virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override { AU.setPreservesCFG(); }
virtual bool runOnFunction(llvm::Function &F) override;
virtual llvm::StringRef getPassName() const override { return "remove non-position output in vertex shader"; }
};
llvm::FunctionPass *createRemoveNonPositionOutputPass() { return new RemoveNonPositionOutput(); }
// Register pass to igc-opt
#define PASS_FLAG_POSH "igc-remove-nonposition-output"
#define PASS_DESCRIPTION_POSH "Custom Pass for Position-Only Shader"
#define PASS_CFG_ONLY_POSH false
#define PASS_ANALYSIS_POSH false
IGC_INITIALIZE_PASS_BEGIN(RemoveNonPositionOutput, PASS_FLAG_POSH, PASS_DESCRIPTION_POSH, PASS_CFG_ONLY_POSH,
PASS_ANALYSIS_POSH)
IGC_INITIALIZE_PASS_END(RemoveNonPositionOutput, PASS_FLAG_POSH, PASS_DESCRIPTION_POSH, PASS_CFG_ONLY_POSH,
PASS_ANALYSIS_POSH)
char RemoveNonPositionOutput::ID = 0;
RemoveNonPositionOutput::RemoveNonPositionOutput() : FunctionPass(ID) {
initializeRemoveNonPositionOutputPass(*PassRegistry::getPassRegistry());
}
bool RemoveNonPositionOutput::runOnFunction(Function &F) {
// Initialize the worklist to all of the instructions ready to process...
SmallVector<Instruction *, 10> instructionToRemove;
for (inst_iterator II = inst_begin(F), E = inst_end(F); II != E; ++II) {
if (GenIntrinsicInst *inst = dyn_cast<GenIntrinsicInst>(&*II)) {
if (inst->getIntrinsicID() == GenISAIntrinsic::GenISA_OUTPUT) {
const ShaderOutputType usage =
static_cast<ShaderOutputType>(llvm::cast<llvm::ConstantInt>(inst->getOperand(4))->getZExtValue());
if (usage != SHADER_OUTPUT_TYPE_POSITION &&
usage != SHADER_OUTPUT_TYPE_POINTWIDTH && usage != SHADER_OUTPUT_TYPE_VIEWPORT_ARRAY_INDEX &&
usage != SHADER_OUTPUT_TYPE_CLIPDISTANCE_LO && usage != SHADER_OUTPUT_TYPE_CLIPDISTANCE_HI) {
instructionToRemove.push_back(inst);
}
}
}
}
bool changed = false;
uint num = instructionToRemove.size();
for (uint i = 0; i < num; ++i) {
instructionToRemove[i]->eraseFromParent();
changed = true;
}
return changed;
}
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