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https://github.com/KhronosGroup/SPIRV-Tools
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c8e1588cfa
This adds two passes to accomplish this: one pass to analyze a shader to determine the input slots that are live. The second pass is run on the preceding shader to eliminate any stores to output slots that are not consumed by the following shader. These passes support vert, tesc, tese, geom, and frag shaders. These passes are currently only available through the API. These passes together with dead code elimination, and elimination of dead input and output components and variables (WIP), will allow users to do dead code elimination across shader boundaries.
46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
// Copyright (c) 2022 The Khronos Group Inc.
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// Copyright (c) 2022 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/analyze_live_input_pass.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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Pass::Status AnalyzeLiveInputPass::Process() {
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// Current functionality assumes shader capability
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if (!context()->get_feature_mgr()->HasCapability(SpvCapabilityShader))
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return Status::SuccessWithoutChange;
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Pass::Status status = DoLiveInputAnalysis();
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return status;
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}
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Pass::Status AnalyzeLiveInputPass::DoLiveInputAnalysis() {
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// Current functionality only supports frag, tesc, tese or geom shaders.
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// Report failure for any other stage.
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auto stage = context()->GetStage();
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if (stage != SpvExecutionModelFragment &&
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stage != SpvExecutionModelTessellationControl &&
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stage != SpvExecutionModelTessellationEvaluation &&
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stage != SpvExecutionModelGeometry)
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return Status::Failure;
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context()->get_liveness_mgr()->GetLiveness(live_locs_, live_builtins_);
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return Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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