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