mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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9d1b572884
This adds the --eliminate-dead-input-components pass which currently removes trailing unused components from input arrays. Fixes #4532
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
// Copyright (c) 2021 The Khronos Group Inc.
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// Copyright (c) 2021 Valve Corporation
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// Copyright (c) 2021 LunarG Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/opt/interp_fixup_pass.h"
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#include <set>
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#include <string>
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#include "ir_builder.h"
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#include "source/opt/ir_context.h"
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#include "type_manager.h"
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namespace spvtools {
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namespace opt {
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namespace {
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// Input Operand Indices
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static const int kSpvVariableStorageClassInIdx = 0;
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// Folding rule function which attempts to replace |op(OpLoad(a),...)|
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// by |op(a,...)|, where |op| is one of the GLSLstd450 InterpolateAt*
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// instructions. Returns true if replaced, false otherwise.
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bool ReplaceInternalInterpolate(IRContext* ctx, Instruction* inst,
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const std::vector<const analysis::Constant*>&) {
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uint32_t glsl450_ext_inst_id =
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ctx->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
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assert(glsl450_ext_inst_id != 0);
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uint32_t ext_opcode = inst->GetSingleWordInOperand(1);
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uint32_t op1_id = inst->GetSingleWordInOperand(2);
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Instruction* load_inst = ctx->get_def_use_mgr()->GetDef(op1_id);
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if (load_inst->opcode() != SpvOpLoad) return false;
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Instruction* base_inst = load_inst->GetBaseAddress();
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USE_ASSERT(base_inst->opcode() == SpvOpVariable &&
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base_inst->GetSingleWordInOperand(kSpvVariableStorageClassInIdx) ==
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SpvStorageClassInput &&
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"unexpected interpolant in InterpolateAt*");
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uint32_t ptr_id = load_inst->GetSingleWordInOperand(0);
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uint32_t op2_id = (ext_opcode != GLSLstd450InterpolateAtCentroid)
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? inst->GetSingleWordInOperand(3)
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: 0;
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Instruction::OperandList new_operands;
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new_operands.push_back({SPV_OPERAND_TYPE_ID, {glsl450_ext_inst_id}});
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new_operands.push_back(
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{SPV_OPERAND_TYPE_EXTENSION_INSTRUCTION_NUMBER, {ext_opcode}});
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new_operands.push_back({SPV_OPERAND_TYPE_ID, {ptr_id}});
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if (op2_id != 0) new_operands.push_back({SPV_OPERAND_TYPE_ID, {op2_id}});
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inst->SetInOperands(std::move(new_operands));
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ctx->UpdateDefUse(inst);
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return true;
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}
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class InterpFoldingRules : public FoldingRules {
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public:
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explicit InterpFoldingRules(IRContext* ctx) : FoldingRules(ctx) {}
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protected:
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virtual void AddFoldingRules() override {
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uint32_t extension_id =
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context()->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
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if (extension_id != 0) {
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ext_rules_[{extension_id, GLSLstd450InterpolateAtCentroid}].push_back(
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ReplaceInternalInterpolate);
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ext_rules_[{extension_id, GLSLstd450InterpolateAtSample}].push_back(
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ReplaceInternalInterpolate);
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ext_rules_[{extension_id, GLSLstd450InterpolateAtOffset}].push_back(
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ReplaceInternalInterpolate);
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}
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}
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};
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class InterpConstFoldingRules : public ConstantFoldingRules {
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public:
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InterpConstFoldingRules(IRContext* ctx) : ConstantFoldingRules(ctx) {}
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protected:
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virtual void AddFoldingRules() override {}
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};
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} // namespace
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Pass::Status InterpFixupPass::Process() {
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bool changed = false;
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// Traverse the body of the functions to replace instructions that require
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// the extensions.
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InstructionFolder folder(
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context(),
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std::unique_ptr<InterpFoldingRules>(new InterpFoldingRules(context())),
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MakeUnique<InterpConstFoldingRules>(context()));
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for (Function& func : *get_module()) {
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func.ForEachInst([&changed, &folder](Instruction* inst) {
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if (folder.FoldInstruction(inst)) {
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changed = true;
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}
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});
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}
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return changed ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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