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Add SSSE3 implementation of Adler32.

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This commit is contained in:
Natalia Portillo
2021-09-28 22:38:04 +01:00
parent 25f1435086
commit f4979c9c8d
3 changed files with 204 additions and 3 deletions
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14
Adler32Context.cs
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@@ -31,6 +31,7 @@
// ****************************************************************************/
using System.IO;
using System.Runtime.Intrinsics.X86;
using System.Text;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
@@ -41,9 +42,9 @@ namespace Aaru.Checksums
/// <summary>Implements the Adler-32 algorithm</summary>
public sealed class Adler32Context : IChecksum
{
const ushort ADLER_MODULE = 65521;
const uint NMAX = 5552;
ushort _sum1, _sum2;
internal const ushort ADLER_MODULE = 65521;
internal const uint NMAX = 5552;
ushort _sum1, _sum2;
/// <summary>Initializes the Adler-32 sums</summary>
public Adler32Context()
@@ -87,6 +88,13 @@ namespace Aaru.Checksums
static void Step(ref ushort preSum1, ref ushort preSum2, byte[] data, uint len)
{
if(Ssse3.IsSupported)
{
Adler32.Ssse3.Step(ref preSum1, ref preSum2, data, len);
return;
}
uint sum1 = preSum1;
uint sum2 = preSum2;
uint n;