Add ARM special instructions implementation for CRC32.

Aaru6.Checksums/Aaru6.Checksums.csproj

@@ -58,6 +58,7 @@
     <Compile Include="CRC16CCITTContext.cs" />
     <Compile Include="CRC16IBMContext.cs" />
     <Compile Include="CRC32\clmul.cs" />
+    <Compile Include="CRC32\arm_simd.cs" />
     <Compile Include="CRC64\clmul.cs" />
     <Compile Include="SpamSumContext.cs" />
     <Compile Include="Adler32Context.cs" />

Aaru6.Checksums/CRC32/arm_simd.cs

@@ -0,0 +1,139 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : arm_simd.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//                  The Chromium Authors
+//
+// Component      : Checksums.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+// Compute CRC32 checksum using ARM special instructions..
+//
+// --[ License ] --------------------------------------------------------------
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2021 Natalia Portillo
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// ****************************************************************************/
+
+using System;
+using System.Runtime.Intrinsics.Arm;
+
+namespace Aaru6.Checksums.CRC32
+{
+    internal static class ArmSimd
+    {
+        internal static uint Step64(byte[] buf, long len, uint crc)
+        {
+            uint c = crc;
+
+            int bufPos = 0;
+
+            while(len >= 64)
+            {
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                len    -= 64;
+            }
+
+            while(len >= 8)
+            {
+                c      =  Crc32.Arm64.ComputeCrc32(c, BitConverter.ToUInt64(buf, bufPos));
+                bufPos += 8;
+                len    -= 8;
+            }
+
+            while(len-- > 0)
+            {
+                c = Crc32.ComputeCrc32(c, buf[bufPos++]);
+            }
+
+            return c;
+        }
+
+        internal static uint Step32(byte[] buf, long len, uint crc)
+        {
+            uint c = crc;
+
+            int bufPos = 0;
+
+            while(len >= 32)
+            {
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                len    -= 32;
+            }
+
+            while(len >= 4)
+            {
+                c      =  Crc32.ComputeCrc32(c, BitConverter.ToUInt32(buf, bufPos));
+                bufPos += 4;
+                len    -= 4;
+            }
+
+            while(len-- > 0)
+            {
+                c = Crc32.ComputeCrc32(c, buf[bufPos++]);
+            }
+
+            return c;
+        }
+    }
+}

Aaru6.Checksums/CRC32Context.cs

@@ -32,6 +32,7 @@
 
 using System;
 using System.IO;
+using System.Runtime.Intrinsics.Arm;
 using System.Runtime.Intrinsics.X86;
 using System.Text;
 using Aaru.CommonTypes.Interfaces;
@@ -411,8 +412,9 @@ namespace Aaru6.Checksums
 
         static void Step(ref uint previousCrc, uint[][] table, byte[] data, uint len, bool useIso)
         {
-            if(useIso                &&
+            if(useIso)
-               Pclmulqdq.IsSupported &&
+            {
+                if(Pclmulqdq.IsSupported &&
                    Sse41.IsSupported     &&
                    Ssse3.IsSupported     &&
                    Sse2.IsSupported)
@@ -422,6 +424,21 @@ namespace Aaru6.Checksums
                     return;
                 }
 
+                if(Crc32.Arm64.IsSupported)
+                {
+                    previousCrc = ArmSimd.Step64(data, len, previousCrc);
+
+                    return;
+                }
+
+                if(Crc32.IsSupported)
+                {
+                    previousCrc = ArmSimd.Step32(data, len, previousCrc);
+
+                    return;
+                }
+            }
+
             // Unroll according to Intel slicing by uint8_t
             // http://www.intel.com/technology/comms/perfnet/download/CRC_generators.pdf
             // http://sourceforge.net/projects/slicing-by-8/