mirror of
https://github.com/aykhans/AzSuicideDataVisualization.git
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116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <utility>
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#include <vector>
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#include "arrow/status.h"
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#include "arrow/util/cpu_info.h"
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namespace arrow {
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namespace internal {
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enum class DispatchLevel : int {
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// These dispatch levels, corresponding to instruction set features,
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// are sorted in increasing order of preference.
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NONE = 0,
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SSE4_2,
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AVX2,
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AVX512,
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NEON,
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MAX
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};
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/*
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A facility for dynamic dispatch according to available DispatchLevel.
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Typical use:
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static void my_function_default(...);
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static void my_function_avx2(...);
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struct MyDynamicFunction {
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using FunctionType = decltype(&my_function_default);
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static std::vector<std::pair<DispatchLevel, FunctionType>> implementations() {
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return {
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{ DispatchLevel::NONE, my_function_default }
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#if defined(ARROW_HAVE_RUNTIME_AVX2)
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, { DispatchLevel::AVX2, my_function_avx2 }
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#endif
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};
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}
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};
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void my_function(...) {
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static DynamicDispatch<MyDynamicFunction> dispatch;
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return dispatch.func(...);
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}
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*/
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template <typename DynamicFunction>
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class DynamicDispatch {
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protected:
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using FunctionType = typename DynamicFunction::FunctionType;
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using Implementation = std::pair<DispatchLevel, FunctionType>;
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public:
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DynamicDispatch() { Resolve(DynamicFunction::implementations()); }
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FunctionType func = {};
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protected:
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// Use the Implementation with the highest DispatchLevel
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void Resolve(const std::vector<Implementation>& implementations) {
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Implementation cur{DispatchLevel::NONE, {}};
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for (const auto& impl : implementations) {
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if (impl.first >= cur.first && IsSupported(impl.first)) {
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// Higher (or same) level than current
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cur = impl;
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}
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}
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if (!cur.second) {
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Status::Invalid("No appropriate implementation found").Abort();
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}
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func = cur.second;
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}
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private:
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bool IsSupported(DispatchLevel level) const {
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static const auto cpu_info = arrow::internal::CpuInfo::GetInstance();
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switch (level) {
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case DispatchLevel::NONE:
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return true;
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case DispatchLevel::SSE4_2:
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return cpu_info->IsSupported(CpuInfo::SSE4_2);
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case DispatchLevel::AVX2:
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return cpu_info->IsSupported(CpuInfo::AVX2);
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case DispatchLevel::AVX512:
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return cpu_info->IsSupported(CpuInfo::AVX512);
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default:
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return false;
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}
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}
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};
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} // namespace internal
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} // namespace arrow
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