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use possible hardware accelerated System.Numerics.BitOperations.Log2(n)

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UbitUmarov
2022-11-22 22:19:24 +00:00
parent 56ab72f8b2
commit dad22a822e
1 changed files with 15 additions and 28 deletions
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43
OpenSim/Framework/Util.cs
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@@ -55,6 +55,7 @@ using OpenMetaverse;
using OpenMetaverse.StructuredData;
using Amib.Threading;
using System.Collections.Concurrent;
using System.Reflection.Metadata;
namespace OpenSim.Framework
{
@@ -178,6 +179,14 @@ namespace OpenSim.Framework
public static readonly char[] SplitSemicolonArray = new char[] { ';' };
public static readonly char[] SplitSlashArray = new char[] { '/' };
public static readonly XmlReaderSettings SharedXmlReaderSettings = new()
{
IgnoreWhitespace = true,
ConformanceLevel = ConformanceLevel.Fragment,
DtdProcessing = DtdProcessing.Ignore,
MaxCharactersInDocument = 10_000_000
};
/// <summary>
/// Thread pool used for Util.FireAndForget if FireAndForgetMethod.SmartThreadPool is used
/// </summary>
@@ -213,38 +222,16 @@ namespace OpenSim.Framework
return Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
}
// next should be replaced using .net5 system numerics bitoperations log2
// this is just log2 + 1
private static readonly byte[] nBitsLookup =
{
01, 10, 02, 11, 14, 22, 03, 30, 12, 15, 17, 19, 23, 26, 04, 31,
09, 13, 21, 29, 16, 18, 25, 08, 20, 28, 24, 07, 27, 06, 05, 32
};
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int NumberBits(uint n)
{
n |= (n >> 1);
n |= (n >> 2);
n |= (n >> 4);
n |= (n >> 8);
n |= (n >> 16);
return nBitsLookup[(n * 0x07C4ACDDu) >> 27];
return System.Numerics.BitOperations.Log2(n) + 1;
}
private static readonly byte[] intLog2Lookup =
{
00, 09, 01, 10, 13, 21, 02, 29, 11, 14, 16, 18, 22, 25, 03, 30,
08, 12, 20, 28, 15, 17, 24, 07, 19, 27, 23, 06, 26, 05, 04, 31
};
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int intLog2(uint n)
{
n |= (n >> 1);
n |= (n >> 2);
n |= (n >> 4);
n |= (n >> 8);
n |= (n >> 16);
return intLog2Lookup[(n * 0x07C4ACDDu) >> 27];
return System.Numerics.BitOperations.Log2(n);
}
/// <summary>
@@ -2311,13 +2298,13 @@ namespace OpenSim.Framework
public static readonly string RuntimeInformationStr = RuntimeInformation.ProcessArchitecture.ToString() + "/" + Environment.OSVersion.Platform switch
{
PlatformID.MacOSX or PlatformID.Unix => RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? "OSX/DotNet" : "Unix/DotNet",
_ => "Win/DotNet",
_ => "Win/DotNet"
};
public static readonly string RuntimePlatformStr = Environment.OSVersion.Platform switch
{
PlatformID.MacOSX or PlatformID.Unix => RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? "OSX/DotNet" : "Unix/DotNet",
_ => "Win/DotNet",
_ => "Win/DotNet"
};
/// <summary>