mono/netcore/System.Private.CoreLib/shared/System/Buffer.Unix.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#if BIT64
using nuint = System.UInt64;
#else
using nuint = System.UInt32;
#endif

namespace System
{
    public static partial class Buffer
    {
#if ARM64
            // Managed code is currently faster than glibc unoptimized memmove
            // TODO-ARM64-UNIX-OPT revisit when glibc optimized memmove is in Linux distros
            // https://github.com/dotnet/coreclr/issues/13844
            private const nuint MemmoveNativeThreshold = ulong.MaxValue;
#elif ARM
            private const nuint MemmoveNativeThreshold = 512;
#else
            private const nuint MemmoveNativeThreshold = 2048;
#endif
    }
}