mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright (c) 2018 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_OPT_LOOP_FUSION_PASS_H_
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#define SOURCE_OPT_LOOP_FUSION_PASS_H_
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#include "source/opt/pass.h"
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namespace spvtools {
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namespace opt {
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// Implements a loop fusion pass.
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// This pass will look for adjacent loops that are compatible and legal to be
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// fused. It will fuse all such loops as long as the register usage for the
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// fused loop stays under the threshold defined by |max_registers_per_loop|.
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class LoopFusionPass : public Pass {
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public:
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explicit LoopFusionPass(size_t max_registers_per_loop)
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: Pass(), max_registers_per_loop_(max_registers_per_loop) {}
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const char* name() const override { return "loop-fusion"; }
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// Processes the given |module|. Returns Status::Failure if errors occur when
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// processing. Returns the corresponding Status::Success if processing is
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// successful to indicate whether changes have been made to the module.
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Status Process() override;
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private:
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// Fuse loops in |function| if compatible, legal and the fused loop won't use
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// too many registers.
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bool ProcessFunction(Function* function);
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// The maximum number of registers a fused loop is allowed to use.
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size_t max_registers_per_loop_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_LOOP_FUSION_PASS_H_
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