69 lines
2.3 KiB
69 lines
2.3 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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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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#pragma once
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#include <memory>
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#include "paddle/fluid/memory/allocation/allocator.h"
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namespace paddle {
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namespace memory {
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namespace allocation {
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template <size_t kAlignment>
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class AlignedAllocation : public Allocation {
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public:
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AlignedAllocation(std::unique_ptr<Allocation>&& underlying_allocation,
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size_t size)
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: Allocation(AlignedPtr(underlying_allocation->ptr()), size,
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underlying_allocation->place()),
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underlying_allocation_(std::move(underlying_allocation)) {}
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private:
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static void* AlignedPtr(void* ptr) {
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auto ptr_addr = reinterpret_cast<uintptr_t>(ptr);
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ptr_addr = (ptr_addr & ~(kAlignment - 1)) + kAlignment;
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return reinterpret_cast<void*>(ptr_addr);
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}
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std::unique_ptr<Allocation> underlying_allocation_;
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};
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class ThinAlignedAllocator : public ManagedAllocator {
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public:
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explicit ThinAlignedAllocator(
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std::shared_ptr<ManagedAllocator> underlyning_allocator);
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protected:
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std::shared_ptr<ManagedAllocator> underlying_allocator_;
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};
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template <size_t kAlignment>
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class AlignedAllocator : public ThinAlignedAllocator {
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public:
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using ThinAlignedAllocator::ThinAlignedAllocator;
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std::unique_ptr<Allocation> Allocate(size_t size, Attr attr) override {
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auto raw_allocation =
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underlying_allocator_->Allocate(size + kAlignment, attr);
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return std::unique_ptr<Allocation>(
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new AlignedAllocation<kAlignment>(std::move(raw_allocation), size));
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}
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std::shared_ptr<Allocation> AllocateShared(size_t size, Attr attr) override {
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return std::shared_ptr<Allocation>(Allocate(size, attr).release());
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}
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};
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} // namespace allocation
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} // namespace memory
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} // namespace paddle
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