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Add SSSE3 implementation of Adler32.

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This commit is contained in:
Natalia Portillo
2021-09-28 22:34:29 +01:00
parent 1a34caa5e8
commit f083a8ece4
4 changed files with 215 additions and 19 deletions
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15
Aaru6.Checksums/Adler32Context.cs
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@@ -31,9 +31,11 @@
// ****************************************************************************/
using System.IO;
using System.Runtime.Intrinsics.X86;
using System.Text;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;
using Aaru6.Checksums.Adler32;
namespace Aaru6.Checksums
{
@@ -41,9 +43,9 @@ namespace Aaru6.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 +89,13 @@ namespace Aaru6.Checksums
static void Step(ref ushort preSum1, ref ushort preSum2, byte[] data, uint len)
{
if(Ssse3.IsSupported)
{
ssse3.Step(ref preSum1, ref preSum2, data, len);
return;
}
uint sum1 = preSum1;
uint sum2 = preSum2;
uint n;