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61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* XzCrc64Opt.c -- CRC64 calculation
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2023-04-02 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include "CpuArch.h"
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#ifndef MY_CPU_BE
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#define CRC64_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
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UInt64 Z7_FASTCALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
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UInt64 Z7_FASTCALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table)
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{
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const Byte *p = (const Byte *)data;
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2(v, *p);
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for (; size >= 4; size -= 4, p += 4)
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{
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const UInt32 d = (UInt32)v ^ *(const UInt32 *)(const void *)p;
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v = (v >> 32)
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^ (table + 0x300)[((d ) & 0xFF)]
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^ (table + 0x200)[((d >> 8) & 0xFF)]
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^ (table + 0x100)[((d >> 16) & 0xFF)]
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^ (table + 0x000)[((d >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2(v, *p);
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return v;
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}
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#endif
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#ifndef MY_CPU_LE
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#define CRC64_UPDATE_BYTE_2_BE(crc, b) (table[(Byte)((crc) >> 56) ^ (b)] ^ ((crc) << 8))
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UInt64 Z7_FASTCALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
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UInt64 Z7_FASTCALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table)
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{
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const Byte *p = (const Byte *)data;
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table += 0x100;
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v = Z7_BSWAP64(v);
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for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2_BE(v, *p);
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for (; size >= 4; size -= 4, p += 4)
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{
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const UInt32 d = (UInt32)(v >> 32) ^ *(const UInt32 *)(const void *)p;
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v = (v << 32)
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^ (table + 0x000)[((d ) & 0xFF)]
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^ (table + 0x100)[((d >> 8) & 0xFF)]
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^ (table + 0x200)[((d >> 16) & 0xFF)]
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^ (table + 0x300)[((d >> 24))];
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}
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for (; size > 0; size--, p++)
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v = CRC64_UPDATE_BYTE_2_BE(v, *p);
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return Z7_BSWAP64(v);
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}
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#endif
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