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https://github.com/KhronosGroup/SPIRV-Tools
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2aaa8653da
This PR introduces TransformationAddLoopPreheader, which, given a loop header and enough fresh ids, adds a loop preheader, updating all the references so that this new block is the only out-of-loop predecessor of the header, which branches unconditionally to the header. See the discussion in #3095.
58 lines
2.2 KiB
C++
58 lines
2.2 KiB
C++
// Copyright (c) 2020 Google LLC
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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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#ifndef SOURCE_FUZZ_TRANSFORMATION_ADD_LOOP_PREHEADER_H
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#define SOURCE_FUZZ_TRANSFORMATION_ADD_LOOP_PREHEADER_H
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#include "source/fuzz/transformation.h"
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namespace spvtools {
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namespace fuzz {
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class TransformationAddLoopPreheader : public Transformation {
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public:
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explicit TransformationAddLoopPreheader(
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const protobufs::TransformationAddLoopPreheader& message);
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TransformationAddLoopPreheader(uint32_t loop_header_block, uint32_t fresh_id,
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std::vector<uint32_t> phi_id);
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// - |message_.loop_header_block| must be the id of a loop header block in
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// the given module.
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// - |message_.fresh_id| must be an available id.
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// - |message_.phi_ids| must be a list of available ids.
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// It can be empty if the loop header only has one predecessor outside of
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// the loop. Otherwise, it must contain at least as many ids as OpPhi
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// instructions in the loop header block.
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bool IsApplicable(
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opt::IRContext* ir_context,
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const TransformationContext& transformation_context) const override;
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// Adds a preheader block as the unique out-of-loop predecessor of the given
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// loop header block. All of the existing out-of-loop predecessors of the
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// header are changed so that they branch to the preheader instead.
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void Apply(opt::IRContext* ir_context,
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TransformationContext* transformation_context) const override;
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protobufs::Transformation ToMessage() const override;
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private:
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protobufs::TransformationAddLoopPreheader message_;
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};
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} // namespace fuzz
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} // namespace spvtools
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#endif // SOURCE_FUZZ_TRANSFORMATION_ADD_LOOP_PREHEADER_H
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