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Implement Fletcher-32 using ARM NEON instructions.

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This commit is contained in:
Natalia Portillo
2023-09-23 02:53:04 +01:00
parent 98376fb93c
commit b741a2eaf1
3 changed files with 238 additions and 5 deletions
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19
Aaru6.Checksums/FletcherContext.cs
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@@ -35,20 +35,22 @@
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics.Arm;
using System.Text;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
using Aaru6.Checksums.Fletcher32;
namespace Aaru6.Checksums;
/// <summary>Implements the Fletcher-32 algorithm</summary>
public sealed class Fletcher32Context : IChecksum
{
const ushort FLETCHER_MODULE = 0xFFFF;
const uint NMAX = 5552;
readonly IntPtr _nativeContext;
readonly bool _useNative;
ushort _sum1, _sum2;
internal const ushort FLETCHER_MODULE = 0xFFFF;
internal const uint NMAX = 5552;
readonly IntPtr _nativeContext;
readonly bool _useNative;
ushort _sum1, _sum2;
/// <summary>Initializes the Fletcher-32 sums</summary>
public Fletcher32Context()
@@ -131,6 +133,13 @@ public sealed class Fletcher32Context : IChecksum
return;
}
if(AdvSimd.IsSupported)
{
neon.Step(ref previousSum1, ref previousSum2, data, len);
return;
}
uint sum1 = previousSum1;
uint sum2 = previousSum2;
uint n;