Merge pull request #461 from negativeExponent/libchdr

[pcsx_rearmed.git] / deps / lzma-16.04 / C / XzCrc64Opt.c

/* XzCrc64Opt.c -- CRC64 calculation\r
2015-03-01 : Igor Pavlov : Public domain */\r
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#include "Precomp.h"\r
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#include "CpuArch.h"\r
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#ifndef MY_CPU_BE\r
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#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))\r
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UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table)\r
{\r
  const Byte *p = (const Byte *)data;\r
  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)\r
    v = CRC_UPDATE_BYTE_2(v, *p);\r
  for (; size >= 4; size -= 4, p += 4)\r
  {\r
    UInt32 d = (UInt32)v ^ *(const UInt32 *)p;\r
    v = (v >> 32)\r
        ^ table[0x300 + ((d      ) & 0xFF)]\r
        ^ table[0x200 + ((d >>  8) & 0xFF)]\r
        ^ table[0x100 + ((d >> 16) & 0xFF)]\r
        ^ table[0x000 + ((d >> 24))];\r
  }\r
  for (; size > 0; size--, p++)\r
    v = CRC_UPDATE_BYTE_2(v, *p);\r
  return v;\r
}\r
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#endif\r
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#ifndef MY_CPU_LE\r
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#define CRC_UINT64_SWAP(v) \\r
      ((v >> 56) \\r
    | ((v >> 40) & ((UInt64)0xFF <<  8)) \\r
    | ((v >> 24) & ((UInt64)0xFF << 16)) \\r
    | ((v >>  8) & ((UInt64)0xFF << 24)) \\r
    | ((v <<  8) & ((UInt64)0xFF << 32)) \\r
    | ((v << 24) & ((UInt64)0xFF << 40)) \\r
    | ((v << 40) & ((UInt64)0xFF << 48)) \\r
    | ((v << 56)))\r
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#define CRC_UPDATE_BYTE_2_BE(crc, b) (table[(Byte)((crc) >> 56) ^ (b)] ^ ((crc) << 8))\r
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UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table)\r
{\r
  const Byte *p = (const Byte *)data;\r
  table += 0x100;\r
  v = CRC_UINT64_SWAP(v);\r
  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)\r
    v = CRC_UPDATE_BYTE_2_BE(v, *p);\r
  for (; size >= 4; size -= 4, p += 4)\r
  {\r
    UInt32 d = (UInt32)(v >> 32) ^ *(const UInt32 *)p;\r
    v = (v << 32)\r
        ^ table[0x000 + ((d      ) & 0xFF)]\r
        ^ table[0x100 + ((d >>  8) & 0xFF)]\r
        ^ table[0x200 + ((d >> 16) & 0xFF)]\r
        ^ table[0x300 + ((d >> 24))];\r
  }\r
  for (; size > 0; size--, p++)\r
    v = CRC_UPDATE_BYTE_2_BE(v, *p);\r
  return CRC_UINT64_SWAP(v);\r
}\r
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#endif\r