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Program 203 reuses prefixSumCache for a second subgroup reduction before every workgroup invocation has consumed the first result. Add a fingerprint-gated SPIR-V pass that inserts the missing Workgroup acquire-release barrier while preserving native subgroup operations. Keep the repair opt-in behind MOBILEGL_ITERATIONRP_FIX_BARRIER, cover insertion, pass-through, and idempotence, and enable it together with the existing iterationRP subgroup repairs for the matching Linux and Android CI retraces.
29 lines
1.3 KiB
C++
29 lines
1.3 KiB
C++
// MobileGL - MobileGL/MG_Util/ShaderTranspiler/SpirvPasses/FixIterationRPBarrierPass.h
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// Copyright (c) 2026 MobileGL-Dev
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// Licensed under the GNU Lesser General Public License v3.0:
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// https://www.gnu.org/licenses/gpl-3.0.txt
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// https://www.gnu.org/licenses/lgpl-3.0.txt
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// SPDX-License-Identifier: LGPL-3.0-only
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// End of Source File Header
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#pragma once
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#include "source/opt/pass.h"
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#include "spirv-tools/optimizer.hpp"
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namespace MobileGL::MG_Util::ShaderTranspiler {
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// Repairs iterationRP Program 203's missing workgroup rendezvous between two
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// reductions that reuse prefixSumCache. The first phase broadcasts its result
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// through prefixSumCache[0], but the second phase may overwrite that element before
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// every invocation has read it. The pass fingerprints that exact two-scan,
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// 512-invocation shape and inserts one Workgroup control barrier immediately before
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// the second scan. Unrelated modules and already-repaired modules are byte-identical.
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class FixIterationRPBarrierPass : public spvtools::opt::Pass {
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public:
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const char* name() const override { return "fix-iterationrp-barrier"; }
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Status Process() override;
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static spvtools::Optimizer::PassToken CreateFixIterationRPBarrierPass();
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};
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} // namespace MobileGL::MG_Util::ShaderTranspiler
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