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Add ARM special instructions implementation for CRC32.

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Natalia Portillo
2021-09-29 02:50:34 +01:00
parent 0f90f7c967
commit e9eb3abdae
3 changed files with 164 additions and 7 deletions
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139
Aaru6.Checksums/CRC32/arm_simd.cs Normal file
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// /***************************************************************************
// 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;
}
}
}