// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Buffers.Binary;
using BenchmarkDotNet.Attributes;

namespace Microsoft.AspNetCore.Server.Kestrel.Performance
{
    public class BinaryPrimitivesBenchmark
    {
        private const int Iterations = 100;

        private byte[] _data;
        
        [GlobalSetup]
        public void Setup()
        {
            _data = new byte[4];
        }

        [Benchmark(Baseline = true, OperationsPerInvoke = Iterations)]
        public uint GetUInt32AsBitwise()
        {
            var v = 0u;
            for (int i = 0; i < 1_000_000; i++)
            {
                v = (uint)((_data[0] << 24) | (_data[1] << 16) | (_data[2] << 8) | _data[3]);
            }
            return v;
        }

        [Benchmark(OperationsPerInvoke = Iterations)]
        public unsafe uint GetUInt32AsBinary()
        {
            var v = 0u;
            for (int i = 0; i < 1_000_000; i++)
            {
                v = BinaryPrimitives.ReadUInt32BigEndian(_data.AsSpan());
            }
            return v;
        }
    }
}