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0001 // Licensed to the Apache Software Foundation (ASF) under one
0002 // or more contributor license agreements.  See the NOTICE file
0003 // distributed with this work for additional information
0004 // regarding copyright ownership.  The ASF licenses this file
0005 // to you under the Apache License, Version 2.0 (the
0006 // "License"); you may not use this file except in compliance
0007 // with the License.  You may obtain a copy of the License at
0008 //
0009 //   http://www.apache.org/licenses/LICENSE-2.0
0010 //
0011 // Unless required by applicable law or agreed to in writing,
0012 // software distributed under the License is distributed on an
0013 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
0014 // KIND, either express or implied.  See the License for the
0015 // specific language governing permissions and limitations
0016 // under the License.
0017 
0018 #pragma once
0019 
0020 #include <cstdint>
0021 
0022 namespace arrow {
0023 namespace ipc {
0024 
0025 // Buffers are padded to 64-byte boundaries (for SIMD)
0026 static constexpr int32_t kArrowAlignment = 64;
0027 
0028 // Tensors are padded to 64-byte boundaries
0029 static constexpr int32_t kTensorAlignment = 64;
0030 
0031 // Align on 8-byte boundaries in IPC
0032 static constexpr int32_t kArrowIpcAlignment = 8;
0033 
0034 static constexpr uint8_t kPaddingBytes[kArrowAlignment] = {0};
0035 
0036 static inline int64_t PaddedLength(int64_t nbytes, int32_t alignment = kArrowAlignment) {
0037   return ((nbytes + alignment - 1) / alignment) * alignment;
0038 }
0039 
0040 }  // namespace ipc
0041 }  // namespace arrow